Java lab-manual

SRINVASAN ENGINEERING COLLEGE

PERAMBALUR - 621212

DEPARTMENT OF INFORMATION TECHNOLOGY

IT 2305- JAVA PROGRAMMING LAB

LAB MANUAL

Academic year (2013-2014) V SEMESTER

PREPARED BY

T.Rajalakshmi

Assistant Professor (IT),

Srinivasan Engineering College, Perambalur-621212

PREFACE

Java Programming Lab manual is intended to provide a

basic knowledge of java programming for students and readers.

To develop software development skills in java programming and

Students will have the proficiency to develop projects in java

programming

Acknowledgement

I give all glory and thanks to our god almighty for showering upon, the

necessary wisdom and grace for accomplishing the lab manual.

I am highly indebted to our respectable chairman and founder of Dhanalakshmi

Srinivasan Group of institutions, SHRI.A.SRINIVASAN for providing with

sufficient facilities that contributed to the success in this endeavor.

I am very thankful to our reputable, beloved principal,

DR.B.KARTHIKEYAN M.E.,Ph.D.,, for his continuous encouragement and for

motivating me to complete this lab manual.

I would like to express my sincere thanks and deep sense of gratitude to our

Head of the Department, Mrs. P. MANJULA M.E for her valuable guidance,

suggestions and constant encouragement paved way for the completion of the manual.

Contents

EX.NO NAME OF THE EXPERIMENT

1

JAVA PACKAGE WITH SIMPLE STACK AND QUEUE

CLASS

2 COMPLEX NUMBER MANIPULATION

3 DATE CLASS SIMILAR TO JAVA.UTIL PACKAGE

4 IMPLEMENTING DYNAMIC POLYMORPHISM IN JAVA

5 JAVA INTERFACE FOR ADT STACK

6 DNA FILE CREATION

7

DEVELOPING A SIMPLE PAINT LIKE PROGRAM

USING APPLET

8 DEVELOPING A SCIENTIFIC CALCULATOR

9 DEVELOPING A TEMPLATE FOR LINKED LIST

10

DEVELOP A MULTI THREADED PRODUCER

CONSUMER APPLICATION

11

GENERATING PRIME NUMBERS AND FIBONACCI

SERIES

12 MULTITHREADED GUI APPLICATION

INTRODUCTION OF THE LANGUAGE

Java is a general-purpose, concurrent, class-based, object-oriented computer programming language

that is specifically designed to have as few implementation dependencies as possible. Java

applications are typically compiled to bytecode (class file) that can run on any Java virtual machine

(JVM) regardless of computer architecture. JVM is an interpreter, accepts Bytecode as input and

execute it.

To compile and run Java program code you need to download JDK (Java

Development Kit).

To compile type: javac file_name.java where file_name is name of file containing

java source code.

Javac is the Java compiler which converts java code into bytecode.

To run type: java main_method_class where main_method_class is the name of class

which defines main method

MAIN FEATURES JAVA PROGRAMMING LANGUAGE

Simple :

Java is Easy to write and more readable and eye catching.

Java has a concise, cohesive set of features that makes it easy to learn and use.

Most of the concepts are drew from C++ thus making Java learning simpler.

Secure :

Java program cannot harm other system thus making it secure.

Java provides a secure means of creating Internet applications.

Java provides secure way to access web applications.

Portable :

Java programs can execute in any environment for which there is a Java run-time

system.(JVM)

Java programs can be run on any platform (Linux,Window,Mac)

Java programs can be transferred over world wide web (e.g applets)

Object-oriented :

Java programming is object-oriented programming language.

Like C++ java provides most of the object oriented features.

Java is pure OOP. Language. (while C++ is semi object oriented)

Robust :

Java encourages error-free programming by being strictly typed and performing

run-time checks.

Multithreaded :

Java provides integrated support for multithreaded programming.

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Architecture-neutral :

Java is not tied to a specific machine or operating system architecture.

Machine Independent i.e Java is independent of hardware .

Interpreted :

Java supports cross-platform code through the use of Java bytecode.

Bytecode can be interpreted on any platform by JVM.

High performance :

Bytecodes are highly optimized.

JVM can executed them much faster .

Distributed :

Java was designed with the distributed environment.

Java can be transmit,run over internet.

Dynamic :

Java programs carry with them substantial amounts of run-time type information

that is used to verify and resolve accesses to objects at run time.

APPLICATIONS

Computer applications

Writing embedded software/firmware for various electronics

Industries

Communications products which use micro-controllers

Developing verification software, test code, simulators etc.

Hardware products.

Research

System designing

Networking

Database connectivity

Mobile Applications

LIST OF EXPERIMENTS

1. Develop a Java package with simple Stack and Queue classes. Use JavaDoc

comments for documentation.

2. Design a class for Complex numbers in Java. In addition to methods for basic

operations on complex numbers, provide a method to return the number of active

objects created.

3. Design a Date class similar to the one provided in the java.util package.

4. Develop with suitable hierarchy, classes for Point, Shape, Rectangle, Square, Circle,

Ellipse, Triangle, Polygon, etc. Design a simple test application to demonstrate

dynamic polymorphism.

5. Design a Java interface for ADT Stack. Develop two different classes that implement

this interface, one using array and the other using linked-list. Provide necessary

exception handling in both the implementations.

6. Write a Java program to read a file that contains DNA sequences of arbitrary length

one per line (note that each DNA sequence is just a String). Your program should sort

the sequences in descending order with respect to the number of 'TATA'

subsequences present. Finally write the sequences in sorted order into another file.

7. Develop a simple paint-like program that can draw basic graphical primitives in

different dimensions and colors. Use appropriate menu and buttons.

8. Develop a scientific calculator using even-driven programming paradigm of Java.

9. Develop a template for linked-list class along with its methods in Java.

10. Design a thread-safe implementation of Queue class. Write a multi-threaded

producer-consumer application that uses this Queue class.

11. Write a multi-threaded Java program to print all numbers below 100,000comthat are

both prime and fibonacci number (some examples are 2, 3, 5, 13, etc.). Design a

thread that generates prime numbers below 100,000 and writes them into a pipe.

Design another thread that generates fibonacci numbers and writes them to another

pipe. The main thread should read both the pipes to identify numbers common to

both.

12. Develop a multi-threaded GUI application of your choice.

IT 2305- JAVA PROGRAMMING LAB

Objective

To Effectively use the Java SDK environment to create, debug and run

simple Java programs

To understand fundamentals of object-oriented programming in Java,

including defining classes, invoking methods, using class libraries, etc.

Ex.No:1 JAVA PACKAGE WITH SIMPLE STACK AND QUEUE CLASS

AIM:

To write program to develop a java package for the stack and queue classes.

EXPLANATION

Java Package

A Java package is a mechanism for organizing Java classes into namespaces similar to the

modules of Modula.In a Java source file, the package that this file's class or classes belong to is

specified with the package keyword.Classes within a package can access classes and members

declared with default access and class members declared with the protected access modifier.

Stack

A stack is a particular kind of abstract data type or collection which follows the Last-In-First-

Out (LIFO) data structure principle. The PUSH operation is for inserting an element into the

stack. POP operation is for deleting an element from the stack.

Queue

A queue is a particular kind of abstract data type or collection which follows the First-In-

First-Out (FIFO) data structure principle.The operations on the collection are the addition of

entities to the rear terminal position, known as enqueue, and removals of entities from the front

terminal position, known as dequeue.

ALGORITHM:

Stack class:

1. Start the program.

2. Create a class with the class name Stack to demonstrate the application of the stack.

3. Create a constructor to initialize the top value of the stack.

4. Define the method push ().

5. If the top value is equal to 9, print stack is full. Otherwise push the value in to the stack.

6. Define the method pop ().

7. If the top value is less than zero, print stack underflow. Otherwise decrement the value of

the stack.

8. Create a main class with the class name teststack.

9. Create an object for the class Stack to call the methods define inside that class.

10. Call the methods push () & pop () using the objects.

Queue class:


2. Create a class with the name queue implement to demonstrate about a application of

queue.

3. Declare a variable str as string and num as integer.

4. Create an object for a class queue implement.

5. Create a constructor to of the Linked List class. This class is used by importing

the java.util. package. This constructor is used for constructing an empty list.

6. Get the value from the command line by using a variable str.

7. Using try and catch block to handle exception using IOException.

8. Print the elements in the queue using the statement.

Stack class:

package SQ;

import java.io.*;

/**

* This class demonstrates about the application of Statck

* @author Herbert Schildt

* @version 1.6

*/

class Stack

{

int stck[]=new int[10];

int tos;

/**

* Stack constructor initializes the top of the stack.

* @param tos The value to be initialized to -1.

*/

Stack()

{

tos=-1;

}

/**

* This method push an item on to the stack.

* @param tos If the value is nine the stack is full otherwise array will incremented.

*/

void push(int item)

{

if(tos==9)

System.out.println("Stack is full");

else

stck[++tos]=item;

}

/**

* This method pop an item on to the stack.

* @param tos If the value is negative the stack is undeflow otherwise array will decremented.

* @return stck[tos--] the stack array will return

*/

int pop()

{

if(tos<0)

{

System.out.println("Stack underflow");

return 0;

}

else

return stck[tos--];

}

}

class TestStack

{

public static void main(String args[])

{

/**

* Two objects will be created to push and pop the items.

* @param mystack1 The object of the class stack.

* @param mystack2 The object of the class stack.

*/

Stack mystack1=new Stack();

Stack mystack2=new Stack();

for(int i=0;i<10;i++)

mystack1.push(i);


mystack2.push(i);

System.out.println("Stack in mystack1:");


System.out.println(mystack1.pop());

System.out.println("Stack im mystack2");


System.out.println(mystack2.pop());

}

}

Queue class:

package SQ;

import java.io.*;

/**

* This class demonstrates about the application of Queue

* @author Herbert Schildt

* @version 1.6

*/

import java.io.*;

import java.util.*;

public class QueueImplement{

LinkedList<Integer> list;

String str;

int num;

public static void main(String[] args){

QueueImplement q = new QueueImplement();

}

/**

* This constructor demonstrates the queue application

* @param str the value get from commandline is stored.

* @exception IOException on input error.

* @see IOException

*/

public QueueImplement(){

try{

list = new LinkedList<Integer>();

InputStreamReader ir = new InputStreamReader(System.in);

BufferedReader bf = new BufferedReader(ir);

System.out.println("Enter number of elements : ");

str = bf.readLine();

if((num = Integer.parseInt(str)) == 0){

System.out.println("You have entered either zero/null.");

System.exit(0);

}

else{

System.out.println("Enter elements : ");

for(int i = 0; i < num; i++){

str = bf.readLine();

int n = Integer.parseInt(str);

list.add(n);

}

}

System.out.println("First element :" + list.removeFirst());

System.out.println("Last element :" + list.removeLast());

System.out.println("Rest elements in the list :");

while(!list.isEmpty()){

System.out.print(list.remove() + "\t");

}

}

catch(IOException e){

System.out.println(e.getMessage() + " is not a legal entry.");

System.exit(0);

}

}

}

OUTPUT:

Stack class:

E:\SQ>path=C:\Program Files\Java\jdk1.5.0\bin

E:\SQ>set path=.;E:\;

E:\SQ>javac TestStack.java

E:\SQ>java SQ.TestStack

Stack in mystack1:

9

8

7

6

5

4

3

2

1

0

Stack in mystack2

19

18

17

16

15

14

13

12

11

10

Queue class:

E:\SQ>javac QueueImplement.java

E:\SQ>java SQ.QueueImplement

Enter number of elements :

4

Enter elements :

2

4

6

8

First element :2

Last element :8

Rest elements in the list :

4 6

Result:

Thus the Stack and queue program was compiled and executed successfully.

VIVA

Define Stack

A stack is a particular kind of abstract data type or collection which follows the Last-In-First-Out

(LIFO) data structure principle.

What are the operations in Stack?

The PUSH operation is for inserting an element into the stack. POP operation is for deleting an

element from the stack.

Define Java Package

A Java package is a mechanism for organizing Java classes into namespaces similar to the

modules of Modula.

Define Queue

A queue is a particular kind of abstract data type or collection which follows the First-In-First-Out

(FIFO) data structure principle.

What are the operations in Queue?

The operations on the collection are the addition of entities to the rear terminal position, known as

enqueue, and removals of entities from the front terminal position, known as dequeue.

Ex.No:2 COMPLEX NUMBER MANIPULATION

AIM:

To write a program to perform addition, subtraction, multiplication in complex numbers using

constructors.

EXPLANATION

A constructor is a member function which initializes a class. It has the same name as the class

itself and has no return type. They are invoked automatically when the objects are created.

Types of constructors

Parameterized constructors

Default constructors

Copy constructors

Destructor is a special member function of a class which is used to destroy the memory of

object. The destructor has the same name as the class, but with a tilde (~). It does not take any

parameters.

ALGORITHM:

1: Start the program.

2: Create a class with a class name Complex Number.

3: Create a constructor with the arguments a and b with integer data type.

4: Define a method getcomplexvalue( ) to get the values of a and b.

5: Define static method named as addition, subtraction,multiplication to perform particular

function defined inside the method.

6: Create an object for the class Complex Number and pass the values in the argument list.

7: Call the method by using object to get the values.

8: Print the result.

9: Stop the program.

COMPLEX NUMBER MANIPULATION

public class ComplexNumber

{

private int a;

private int b;

public ComplexNumber(){

}

public ComplexNumber(int a, int b){

this.a =a;

this.b=b;

}

public String getComplexValue(){

if(this.b < 0){

return a+""+b+"i";

}

else{

return a+"+"+b+"i";

}

}

public static String addition(ComplexNumber num1, ComplexNumber num2){

int a1= num1.a+num2.a;

int b1= num1.b+num2.b;

if(b1<0){

return a1+""+b1+"i";

} else {

return a1+"+"+b1+"i";

}

}

public static String substraction(ComplexNumber num1, ComplexNumber num2){

int a1= num1.a-num2.a;

int b1= num1.b-num2.b;

if(b1<0){

return a1+""+b1+"i";

} else {

return a1+"+"+b1+"i";

}

}

public static String multiplication(ComplexNumber num1, ComplexNumber num2){

int a1= num1.a*num2.a;

int b1= num1.b*num2.b;

int vi1 = num1.a * num2.b;

int vi2 = num2.a * num1.b;

int vi;

vi=vi1+vi2;

if(vi<0){

return a1-b1+""+vi+"i";

} else {

return a1-b1+"+"+vi+"i";

}

}

public static void main(String args[]){

ComplexNumber com1 = new ComplexNumber(-2,-3);

ComplexNumber com2 = new ComplexNumber(-4,-5);

System.out.println(com1.getComplexValue());

System.out.println(com2.getComplexValue());

System.out.println("Addition of both Complex Numbers are :"

+ComplexNumber.addition(com1,com2));

System.out.println("Substraction of both Complex Numbers are :"

+ComplexNumber.substraction(com1,com2));

System.out.println("Multiplication of both Complex Numbers are :"

+ComplexNumber.multiplication(com1,com2));}}

OUTPUT:

E:\Javaexecute>javac ComplexNumber.java

E:\Javaexecute>java ComplexNumber

-2-3i

-4-5i

Addition of both Complex Numbers are :-6-8i

Substraction of both Complex Numbers are :2+2i

Multiplication of both Complex Numbers are :-8+22i

Result:

Thus the complex number program was executed and compiled successfully.

VIVA

Define a Constructor?

A constructor is a member function which initializes a class. It has the same name as the class

itself and has no return type. They are invoked automatically when the objects are created.

What are the types of constructor?

Types of constructors

Parameterized constructors

Default constructors

Copy constructors

Define Destructor?

Destructor is a special member function of a class which is used to destroy the memory of object.

The destructor has the same name as the class, but with a tilde (~). It does not take any parameters.

Ex.No:3 DATE CLASS SIMILAR TO JAVA.UTIL PACKAGE

AIM:

To write a java program to display the dates of before and after days for a given date.

EXPLANATION

Java.util package contains the collections framework, legacy collection classes, event model, date and

time facilities, internationalization, and miscellaneous utility classes.

The java.util.Date class represents a specific instant in time, with millisecond precision.

Date() - This constructor allocates a Date object and initializes it so that it represents the time at

which it was allocated, measured to the nearest millisecond.

boolean after(Date when) - This method tests if this date is after the specified date.

boolean before(Date when) - This method tests if this date is before the specified date.

int compareTo(Date anotherDate) - This method compares two Dates for ordering.

ALGORITHM:


2. Create a class with name Date

3. Declare the variables month, day, year as private and create constructor with arguments.

4. Check the condition for exception. If the date is valid, It will proceed the program otherwise

display the exception “Invalid”.

5. Use Boolean type for method to return the values as either true or false.

6. Check the values for month and values for day using if loops.

7. Check the year using if loop whether it is leap year or not.

8. Define methods isAfter() and isBefore() in program.

9. Define method compareTo() to compare the date.

10. In main() create object today and give current date as value for constructor fields

11. Call the all methods to display the dates.

DATE CLASS SIMILAR TO JAVA.UTIL PACKAGE

public class Date {

private final int month;

private final int day;

private final int year;

public Date(int m, int d, int y) {

if (!isValid(m, d, y))

throw new RuntimeException("Invalid");

month = m;

day = d;

year = y;

}

private static boolean isValid(int m, int d, int y) {

int[] DAYS = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

if (m < 1 || m > 12)

return false;

if (d < 1 || d > DAYS[m])

return false;

if (m == 2 && d == 29 && !isLeapYear(y))

return false;

return true;

}

private static boolean isLeapYear(int y) {

if (y % 400 == 0)

return true;

if (y % 100 == 0)

return false;

return (y % 4 == 0);

}

public Date next() {

if (isValid(month, day + 1, year))

return new Date(month, day + 1, year);

else if (isValid(month + 1, 1, year))

return new Date(month + 1, 1, year);

else

return new Date(1, 1, year + 1);

}

public boolean isAfter(Date b) {

return compareTo(b) > 0;

}

public boolean isBefore(Date b) {

return compareTo(b) < 0;

}

public int compareTo(Date b) {

if (year != b.year)

return year - b.year;

if (month != b.month)

return month - b.month;

return day - b.day;

}

public String toString() {

return day + "-" + month + "-" + year;

}

public static void main(String[] args) {

Date today = new Date(7, 12, 2010);

System.out.println(today);

Date nextDate = today.next();

System.out.println(nextDate);

System.out.println(today.isAfter(nextDate));

System.out.println(today.next().isAfter(today));

System.out.println(today.isBefore(nextDate));

System.out.println(nextDate.compareTo(today));

}

}

Output:

20-7-2013

21-7-2013

false

true

true

1

Result:

Thus the Date class program was compiled and executed successfully.

VIVA

Define Java util package?

Java.util package contains the collections framework, legacy collection classes, event model, date and

time facilities, internationalization, and miscellaneous utility classes.

Define Java util date class?

The java.util.Date class represents a specific instant in time, with millisecond precision.

Define Date()?

Date() - This constructor allocates a Date object and initializes it so that it represents the time at

which it was allocated, measured to the nearest millisecond.

Define after() and before()?

boolean after(Date when) - This method tests if this date is after the specified date.

boolean before(Date when) - This method tests if this date is before the specified date.

Define compareo()?

int compareTo(Date anotherDate) - This method compares two Dates for ordering.

Ex.No:4 IMPLEMENTING DYNAMIC POLYMORPHISM IN JAVA

AIM:

To write a java program for abstract class to find areas of different shapes.

EXPLANATION

An Abstract Classis a class that is declared abstract—it may or may not include abstract

methods. Abstract classes cannot be instantiated, but they can be subclassed.

An Abstract Methodis a method that is declared without an implementation. If you want a class

to contain a particular method but you want the actual implementation of that method to be

determined by child classes, you can declare the method in the parent class as abstract.

Declaring a method as abstract has two results:

The class must also be declared abstract. If a class contains an abstract method, the class must

be abstract as well.

Any child class must either override the abstract method or declare itself abstract.

ALGORITHM:


2. Create an abstract class with class name Shape.

3. Create a constructor with arguments and declare variables dim1, dim2 and PI.

4. Declare an abstract method area() inside the class.

5. Create the classes Rectangle, Triangle, Circle, and Ellipse to find the area.

6. Define abstract method area() inside the subclasses and call the constructor of class Shape

using super keyword.

7. In main(), create the objects for all classes and pass values to fields of constructors.

8. Create a reference variable figuref for abstract class.

9. Using reference variable of class Shape, call the method area() of all subclasses

10. Print the areas for all shapes.

11. Stop the program.

IMPLEMENTING DYNAMIC POLYMORPHISM IN JAVA

abstract class Shape

{

double dim1;

double dim2;

double PI=3.14;

Shape(double a, double b)

{

dim1 = a;

dim2 = b;

}

// area is now an abstract method

abstract double area();

}

class Rectangle extends Shape

{

Rectangle(double a, double b)

{

super(a, b);

}

// override area for rectangle

double area()

{

System.out.println("Inside Area for Rectangle.");

return dim1 * dim2;

}

}

class Triangle extends Shape

{

Triangle(double a, double b)

{

super(a, b);

}

// override area for right triangle

double area()

{

System.out.println("Inside Area for Triangle.");

return dim1 * dim2 / 2;

}

}

class Circle extends Shape

{

Circle(double a, double b)

{

super(a, b);

}

double area()

{

System.out.println("Inside Area for Circle.");

return PI * dim1 * dim1;

}

}

class Ellipse extends Shape

{

Ellipse(double a, double b)

{

super(a, b);

}

double area() {

System.out.println("Inside Area for Ellipse.");

return PI * dim1 * dim2;

}

}

class Square extends Shape

{

Square(double a, double b)

{

super(a, b);

}

double area() {

System.out.println("Inside Area for Square.");

return dim1 * dim1;

}

}

class AbstractAreas {

public static void main(String args[]) {

// Figure f = new Figure(10, 10); // illegal now

Rectangle r = new Rectangle(9, 5);

Triangle t = new Triangle(10, 8);

Circle c=new Circle(5,5);

Ellipse e=new Ellipse(7,7);

Square s=new Square(6,6);

Shape figref; // this is OK, no object is created

figref = r;

System.out.println("Area is " + figref.area());

figref = t;


figref = c;


figref = e;


figref = s;


}

}

OUTPUT:

E:\SQ>java AbstractAreas

Inside Area for Rectangle.

Area is 45.0

Inside Area for Triangle.

Area is 40.0

Inside Area for Circle.

Area is 78.5

Inside Area for Ellipse.

Area is 153.86

Inside Area for Square.

Area is 36.0

Result:

Thus the Dynamic polymorphism was compiled and executed successfully.

VIVA

Define Abstract class?

An Abstract Class is a class that is declared abstract—it may or may not include abstract

methods. Abstract classes cannot be instantiated, but they can be subclassed.

What is Abstract method?

An Abstract Method is a method that is declared without an implementation. If you want a class

to contain a particular method but you want the actual implementation of that method to be

determined by child classes, you can declare the method in the parent class as abstract.

Rules for declaring a abstract method?

The class must also be declared abstract. If a class contains an abstract method, the class must

be abstract as well.

Any child class must either override the abstract method or declare itself abstract.

Ex.No:5 JAVA INTERFACE FOR ADT STACK

AIM:

To write the java program for ADT stack using interface.

EXPLANATION

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting

the abstract methods of the interface. The “extends” keyword is used to extend an interface, and the

child interface inherits the methods of the parent interface. An interface is different from a class in

several ways, including:

An interface cannot be instantiated.

An interface does not contain any constructors.

All of the methods in an interface are abstract.

An interface is not extended by a class; it is implemented by a class.

An interface can extend multiple interfaces.

ALGORITHM:

1: Start the program

2: Create an interface which consists of three methods namely PUSH, POP and DISPLAY

3: Create a class which implements the above interface to implement the concept of stack through

Array

4: Define all the methods of the interface to push any element, to pop the to element and to display the

elements present in the stack.

5: Create another class which implements the same interface to implement the concept of stack

through linked list.

6: Repeat STEP 4 for the above said class also.

7: In the main class, get the choice from the user to choose whether array implementation or linked

list implementation of the stack.

8: Call the methods appropriately according to the choices madeby the user in the previous step.

9: Repeat step 6 and step 7 until the user stops his/her execution

10: Stop the program

JAVA INTERFACE FOR ADT STACK

import java.lang.*;

import java.io.*;

import java.util.*;

interface Mystack

{

int n=10;

public void pop();

public void push();

public void peek();

public void display();

}

class Stackimp implements Mystack

{

int stack[]=new int[n];

int top=-1;

public void push()

{

try{

DataInputStream dis=new DataInputStream(System.in);

if(top==(n-1))

{

System.out.println("overflow");

return;

}

else

{

System.out.println("enter element");

int ele=Integer.parseInt(dis.readLine());

stack[++top]=ele;

}

}

catch(Exception e)

{

System.out.println("e");

}

}

public void pop()

{

if(top<0)

{

System.out.println("underflow");

return;

}

else

{

int popper=stack[top];

top--;

System.out.println("popped element" +popper);

}

}

public void peek()

{

if(top<0)

{

System.out.println("underflow");

return;

}

else

{

int popper=stack[top];

System.out.println("popped element" +popper);

}

}

public void display()

{

if(top<0)

{

System.out.println("empty");

return;

}

else

{

String str=" ";

for(int i=0;i<=top;i++)

str=str+" "+stack[i];

System.out.println("elements are"+str);

}

}

}

class Stackadt

{

public static void main(String arg[])throws IOException

{

DataInputStream dis=new DataInputStream(System.in);

Stackimp stk=new Stackimp();

int ch=0;

do{

System.out.println("enter ur choice for 1.push 2.pop 3.peek 4.display 5.exit");

ch=Integer.parseInt(dis.readLine());

switch(ch){

case 1:stk.push();

break;

case 2:stk.pop();

break;

case 3:stk.peek();

break;

case 4:stk.display();

break;

case 5:System.exit(0);

}

}while(ch<=5);

}

}

OUTPUT:

E:\SQ>java Stackadt

enter ur choice for 1.push 2.pop 3.peek 4.display 5.exit

1

enter element

4


1

enter element

5


1

enter element

7


4

elements are 4 5 7


1

enter element

8


2

popped element8


4

elements are 4 5 7


3

popped element7


4

elements are 4 5 7


5

Result:

Thus the Interface for ADT stack program was compiled and executed successfully.

VIVA

What is peek operation?

Peek is an operation on certain abstract data types, specifically sequential collections such as stacks

and queues, which returns the value of the top of the collection without removing the value from the

data

What is Interface?

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting

the abstract methods of the interface. The “extends” keyword is used to extend an interface, and the

child interface inherits the methods of the parent interface.

State the difference between class and interface?

An interface is different from a class in several ways, including:

An interface cannot be instantiated.

An interface does not contain any constructors.

All of the methods in an interface are abstract.

An interface is not extended by a class; it is implemented by a class.

An interface can extend multiple interfaces.

Ex. No: 6 DNA FILE CREATION

AIM

To write a Java program to read a file that contains DNA sequences of arbitrary length

one per line ,sort the sequences in descending order with respect to the number of 'TATA'

subsequences present and finally write the sequences in sorted order into another file.

EXPLANATION

Java File class is used for creation of files and directories, file searching, file deletion etc.

FileReader Class is used for reading streams of characters. FileWriter Class is used for writing

streams of characters

Define a class Filetransfer and define the main function inside the class.

Use the Filereader to read the input file and use the FileWriter to write the output file

Use the PrintStream to print the output into the file.

Get the input strings from the input file

Sort the string values in the input file using count and temp.

Write the sorted data into the output file

And close the file and display the results

ALGORITHM:

1. Start

2. Create an input text file “DNA.txt” and add the sequence as needed.

3. Read each line from the file to a string array.

4. Count the number of TATA sequence in each line and store the count in another array.

5. Arrange the data in the count array in descending order and also arrange the data in the

string array in parallel with the count array.

6. Write the sorted DNA sequence to the output file “File.txt”

7. View the output file.

8. Stop.

DNA File creation:

import java.util.*;

import java.io.*;

import java.util.Arrays;

import java.util.Collections;

class FileDemo

{

public static void main(String args[])throws IOException

{

String fileLine[] = new String[6];

BufferedReader br = new BufferedReader(new FileReader("dna.txt"));

int i=0,z=0,k=0;;

int[] count =new int[6];

int[] order =new int[6];

int result=0;

String searchFor = "tata";

int len = searchFor.length();

System.out.println ("Reading data from DNA file............. ");

while ((fileLine[k]=br.readLine()) != null )

{

result=0;

if (len > 0)

{

int start = fileLine[k].indexOf(searchFor);

while (start != -1)

{

result++;

start = fileLine[k].indexOf(searchFor, start+len);

count[k]=result;

z++;

}

}

if(k<5)

k++;

else

break;

}

int temp,j;

String temps;

System.out.println ("Swapping data from DNA file............. ");

for(i=0;i<(count.length-1);i++)

{

for(j=i;j<=(count.length-1);j++)

{

if(count[i]<count[j])

{

temp=count[i];

count[i]=count[j];

count[j]=temp;

temps=fileLine[i];

fileLine[i]=fileLine[j];

fileLine[j]=temps;

}

}

}

System.out.println ("Writing Sorted DNA sequence to Output file................. ");

try {

BufferedWriter writer=new BufferedWriter(new FileWriter("file1.txt"));

for(i=0;i<6;i++)

{

writer.write(fileLine[i]);

writer.newLine();

}

writer.close();

System.out.println ("Writing of Sorted DNA sequence to Output file has been

completed................. ");

}

catch(IOException ex)

{

ex.printStackTrace();

}

}

}

Input:

/*dna.txt*/

Attaaattaaaaaaaattata taaattaataaattagaattaaa

Aaaaaaacatcgtaaa tcaatatatataat

Ctaaaataaac gataaaaacaaataa

Output:

C:\Program Files\Java\jdk1.6.0\bin>javac FileDemo.java

C:\Program Files\Java\jdk1.6.0\bin>java FileDemo

Reading data from DNA file.............

Swapping data from DNA file.............

Writing Sorted DNA sequence to Output file.................

Writing of Sorted DNA sequence to Output file has been completed................

/*File.txt*/

Tcaatatatataat attaaattaaaaaaaattata

Aaaaaaacatcgtaaa taaattaataaattagaattaaa

Ctaaaataaac gataaaaacaaataa

Result:

Thus the DNA sequences were read sorted and output was given to an output file.

VIVA

Define File class

Java File class is used for creation of files and directories, file searching, file deletion etc.

Define FileReader class

FileReader Class is used for reading streams of characters.

Define FileWriter class

FileWriter Class is used for writing streams of characters

Define IOException()

An Exception that Constructs an IOException with null as its error detail message.

What is the use of java.util.Collections

java.util.Collections class consists exclusively of static methods that operate on or return

collections of data

Ex.No:7 DEVELOPING A SIMPLE PAINT LIKE PROGRAM USING APPLET

AIM:

To develop a simple paint like program using applet in java.

EXPLANATION

An Applet is a Java class that extends the java.applet.Applet class.A JVM is required to view an

applet. The JVM can be either a plug-in of the Web browser or a separate runtime environment.

Life Cycle of an Applet:

init: This method is intended for whatever initialization is needed for your applet. It is called

after the param tags inside the applet tag have been processed.

start: This method is automatically called after the browser calls the init method. It is also

called whenever the user returns to the page containing the applet after having gone off to

other pages.

stop: This method is automatically called when the user moves off the page on which the

applet sits. It can, therefore, be called repeatedly in the same applet.

destroy: This method is only called when the browser shuts down normally. Because applets

are meant to live on an HTML page, you should not normally leave resources behind after a

user leaves the page that contains the applet.

paint: Invoked immediately after the start() method, and also any time the applet needs to

repaint itself in the browser. The paint() method is actually inherited from the java.awt.

ALGORITHM:

1. Import the required class and packages.

2. Create a class Drawtest for creating an applet.

3. Initialize panels and controls in the init() method.

4. Define the destroy() method to destroy the same.

5. Create an instance for draw test class and call the init(0 and start() methods in the main

method.

6. Add a new frame to the applet window and resize it to 300x300.

7. Declare a method get applet infor to display the applet information.

8. Declare two constants LINES,POINTS which are going to be the modes.

9. Define the paint method and perform the required operations.

10. Display the result according to the mode selected.

DEVELOPING A SIMPLE PAINT LIKE PROGRAM USING APPLET

import java.awt.event.*;

import java.awt.*;

import java.applet.*;

import java.util.Vector;

public class DrawTest extends Applet{

DrawPanel panel;

DrawControls controls;

public void init() {

setLayout(new BorderLayout());

panel = new DrawPanel();

controls = new DrawControls(panel);

add("Center", panel);

add("South",controls);

}

public void destroy() {

remove(panel);

remove(controls);

}


Frame f = new Frame("DrawTest");

DrawTest drawTest = new DrawTest();

drawTest.init();

drawTest.start();

f.add("Center", drawTest);

f.setSize(300, 300);

f.show();

}

public String getAppletInfo() {

return "A simple drawing program.";

}

}

class DrawPanel extends Panel implements MouseListener, MouseMotionListener {

public static final int LINES = 0;

public static final int POINTS = 1;

int mode = LINES;

Vector lines = new Vector();

Vector colors = new Vector();

int x1,y1;

int x2,y2;

public DrawPanel() {

setBackground(Color.white);

addMouseMotionListener(this);

addMouseListener(this);

}

public void setDrawMode(int mode) {

switch (mode) {

case LINES:

case POINTS:

this.mode = mode;

break;

default:

throw new IllegalArgumentException();

}

}

public void mouseDragged(MouseEvent e) {

e.consume();

switch (mode) {

case LINES:

x2 = e.getX();

y2 = e.getY();

break;

case POINTS:

default:

colors.addElement(getForeground());

lines.addElement(new Rectangle(x1, y1, e.getX(), e.getY()));

x1 = e.getX();

y1 = e.getY();

break;

}

repaint();

}

public void mouseMoved(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {

e.consume();

switch (mode) {

case LINES:

x1 = e.getX();

y1 = e.getY();

x2 = -1;

break;

case POINTS:

default:


lines.addElement(new Rectangle(e.getX(), e.getY(), -1, -1));

x1 = e.getX();

y1 = e.getY();

repaint();

break;

}

}

public void mouseReleased(MouseEvent e) {

e.consume();

switch (mode) {

case LINES:


lines.addElement(new Rectangle(x1, y1, e.getX(), e.getY()));

x2 = -1;

break;

case POINTS:

default:

break;

}

repaint();

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mouseClicked(MouseEvent e) {

}

public void paint(Graphics g) {

int np = lines.size();

/* draw the current lines */

g.setColor(getForeground());

for (int i=0; i < np; i++) {

Rectangle p = (Rectangle)lines.elementAt(i);

g.setColor((Color)colors.elementAt(i));

if (p.width != -1) {

g.drawLine(p.x, p.y, p.width, p.height);

} else {

g.drawLine(p.x, p.y, p.x, p.y);

}

}

if (mode == LINES) {

g.setColor(getForeground());

if (x2 != -1) {

g.drawLine(x1, y1, x2, y2);

}

}

}

}

class DrawControls extends Panel implements ItemListener {

DrawPanel target;

public DrawControls(DrawPanel target) {

this.target = target;

setLayout(new FlowLayout());

setBackground(Color.lightGray);

target.setForeground(Color.red);

CheckboxGroup group = new CheckboxGroup();

Checkbox b;

add(b = new Checkbox(null, group, false));

b.addItemListener(this);

b.setForeground(Color.red);



b.setForeground(Color.green);



b.setForeground(Color.blue);



b.setForeground(Color.pink);



b.setForeground(Color.orange);

add(b = new Checkbox(null, group, true));


b.setForeground(Color.black);

target.setForeground(b.getForeground());

Choice shapes = new Choice();

shapes.addItemListener(this);

shapes.addItem("Lines");

shapes.addItem("Points");

shapes.setBackground(Color.lightGray);

add(shapes);

}

public void paint(Graphics g) {

Rectangle r = getBounds();

g.setColor(Color.lightGray);

g.draw3DRect(0, 0, r.width, r.height, false);

int n = getComponentCount();

for(int i=0; i<n; i++) {

Component comp = getComponent(i);

if (comp instanceof Checkbox) {

Point loc = comp.getLocation();

Dimension d = comp.getSize();

g.setColor(comp.getForeground());

g.drawRect(loc.x-1, loc.y-1, d.width+1, d.height+1);

}

}

}

public void itemStateChanged(ItemEvent e) {

if (e.getSource() instanceof Checkbox) {

target.setForeground(((Component)e.getSource()).getForeground());

} else if (e.getSource() instanceof Choice) {

String choice = (String) e.getItem();

if (choice.equals("Lines")) {

target.setDrawMode(DrawPanel.LINES);

} else if (choice.equals("Points")) {

target.setDrawMode(DrawPanel.POINTS);

}

}

}

}

OUTPUT:

Result:

Thus the Applet-Paint program was compiled and executed successfully.

VIVA

Define Applet?

An Applet is a Java class that extends the java.applet.Applet class.A JVM is required to view an

applet. The JVM can be either a plug-in of the Web browser or a separate runtime environment.

Life Cycle of an Applet?

Init(), start(), stop(), destroy(), paint()

Define init()

init: This method is intended for whatever initialization is needed for your applet. It is called after the

param tags inside the applet tag have been processed.

Define start()

start: This method is automatically called after the browser calls the init method. It is also called

whenever the user returns to the page containing the applet after having gone off to other pages.

Define stop()

stop: This method is automatically called when the user moves off the page on which the applet sits.

It can, therefore, be called repeatedly in the same applet.

Define destroy()

destroy: This method is only called when the browser shuts down normally. Because applets are

meant to live on an HTML page, you should not normally leave resources behind after a user leaves

the page that contains the applet.

Define paint()

paint: Invoked immediately after the start() method, and also any time the applet needs to repaint

itself in the browser. The paint() method is actually inherited from the java.awt.

Ex.No:8 DEVELOPING A SCIENTIFIC CALCULATOR

AIM:

To develop a scientific calculator in java.

EXPLANATION

Swing library is an official Java GUI toolkit released by Sun Microsystems. It is used to create

Graphical user interfaces with Java.

JFrame class – It has the components added to the frame are referred to as its contents; these are

managed by the contentPanel. It’s a window with title, border, (optional) menu bar and user-specified

components

The ActionListener interface is used for handling action events. For example, it's used by a JButton

for button clicks, by JCheckbox for checking and unchecking, by a JMenuItem when an option is

picked and many other graphical components.

JButton - is a component the user clicks to trigger a specific action.

ALGORITHM:

1. Import the necessary packages.

2. Create a class calculator JFrame class and ActionListener interface.

3. Create a new font using String name,int style,int size).

4. Set up the JMenu bar and add Mnemenics to them by using setMnemonic() method.

5. Set the frame layout for the applet and set the background color to gray using

setBackground() method .

6. Create a container using JPanel().

7. Create numeric JButtons for operators and numbers using JButtons().

8. Set all the Numbered JButtons to blue .the rest to red usig setForeGround() method.

9. Declare the method getNumberInDisplay() to get by the calculator.

10. Use display result to display the method.

11. Declare the main function and create the instance for calculator and set the attributes

setTitle(),setSize(),setResizable().

12. Stop the program.

DEVELOPING A SCIENTIFIC CALCULATOR


import java.awt.*;

import javax.swing.*;

public class Calculator extends JFrame implements ActionListener{

// Variables

final int MAX_INPUT_LENGTH = 20;

final int INPUT_MODE = 0;

final int RESULT_MODE = 1;

final int ERROR_MODE = 2;

int displayMode;

boolean clearOnNextDigit, percent;

double lastNumber;

String lastOperator;

private JMenu jmenuFile, jmenuHelp;

private JMenuItem jmenuitemExit, jmenuitemAbout;

private JLabel jlbOutput;

private JButton jbnButtons[];

private JPanel jplMaster, jplBackSpace, jplControl;

/*

* Font(String name, int style, int size)

Creates a new Font from the specified name, style and point size.

*/

Font f12 = new Font("Times New Roman", 0, 12);

Font f121 = new Font("Times New Roman", 1, 12);

// Constructor

public Calculator()

{

/* Set Up the JMenuBar.

* Have Provided All JMenu's with Mnemonics

* Have Provided some JMenuItem components with Keyboard Accelerators

*/

jmenuFile = new JMenu("File");

jmenuFile.setFont(f121);

jmenuFile.setMnemonic(KeyEvent.VK_F);

jmenuitemExit = new JMenuItem("Exit");

jmenuitemExit.setFont(f12);

jmenuitemExit.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_X,

ActionEvent.CTRL_MASK));

jmenuFile.add(jmenuitemExit);

jmenuHelp = new JMenu("Help");

jmenuHelp.setFont(f121);

jmenuHelp.setMnemonic(KeyEvent.VK_H);

jmenuitemAbout = new JMenuItem("About Calculator");

jmenuitemAbout.setFont(f12);

jmenuHelp.add(jmenuitemAbout);

JMenuBar mb = new JMenuBar();

mb.add(jmenuFile);

mb.add(jmenuHelp);

setJMenuBar(mb);

//Set frame layout manager

setBackground(Color.gray);

jplMaster = new JPanel();

jlbOutput = new JLabel("0");

jlbOutput.setHorizontalTextPosition(JLabel.RIGHT);

jlbOutput.setBackground(Color.WHITE);

jlbOutput.setOpaque(true);

// Add components to frame

getContentPane().add(jlbOutput, BorderLayout.NORTH);

jbnButtons = new JButton[23];

// GridLayout(int rows, int cols, int hgap, int vgap)

JPanel jplButtons = new JPanel(); // container for Jbuttons

// Create numeric Jbuttons

for (int i=0; i<=9; i++)

{

// set each Jbutton label to the value of index

jbnButtons[i] = new JButton(String.valueOf(i));

}

// Create operator Jbuttons

jbnButtons[10] = new JButton("+/-");

jbnButtons[11] = new JButton(".");

jbnButtons[12] = new JButton("=");

jbnButtons[13] = new JButton("/");

jbnButtons[14] = new JButton("*");

jbnButtons[15] = new JButton("-");

jbnButtons[16] = new JButton("+");

jbnButtons[17] = new JButton("sqrt");

jbnButtons[18] = new JButton("1/x");

jbnButtons[19] = new JButton("%");

jplBackSpace = new JPanel();

jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));

jbnButtons[20] = new JButton("Backspace");

jplBackSpace.add(jbnButtons[20]);

jplControl = new JPanel();

jplControl.setLayout(new GridLayout(1, 2, 2 ,2));

jbnButtons[21] = new JButton(" CE ");

jbnButtons[22] = new JButton("C");

jplControl.add(jbnButtons[21]);

jplControl.add(jbnButtons[22]);

// Setting all Numbered JButton's to Blue. The rest to Red

for (int i=0; i<jbnButtons.length; i++) {

jbnButtons[i].setFont(f12);

if (i<10)

jbnButtons[i].setForeground(Color.blue);

else

jbnButtons[i].setForeground(Color.red);

}

// Set panel layout manager for a 4 by 5 grid

jplButtons.setLayout(new GridLayout(4, 5, 2, 2));

//Add buttons to keypad panel starting at top left

// First row

for(int i=7; i<=9; i++) {

jplButtons.add(jbnButtons[i]);

}

// add button / and sqrt

jplButtons.add(jbnButtons[13]);


// Second row

for(int i=4; i<=6; i++)

{


}

// add button * and x^2



// Third row

for( int i=1; i<=3; i++)

{


}

//adds button - and %



//Fourth Row

// add 0, +/-, ., +, and =






jplMaster.setLayout(new BorderLayout());

jplMaster.add(jplBackSpace, BorderLayout.WEST);

jplMaster.add(jplControl, BorderLayout.EAST);

jplMaster.add(jplButtons, BorderLayout.SOUTH);

// Add components to frame

getContentPane().add(jplMaster, BorderLayout.SOUTH);

requestFocus();

//activate ActionListener

for (int i=0; i<jbnButtons.length; i++){

jbnButtons[i].addActionListener(this);

}

jmenuitemAbout.addActionListener(this);

jmenuitemExit.addActionListener(this);

clearAll();

//add WindowListener for closing frame and ending program

addWindowListener(new WindowAdapter() {

public void windowClosed(WindowEvent e)

{

System.exit(0);

}

}

);

} //End of Contructor Calculator

// Perform action

public void actionPerformed(ActionEvent e){

double result = 0;

if(e.getSource() == jmenuitemAbout){

JDialog dlgAbout = new CustomABOUTDialog(this, "About Java Swing

Calculator", true);

dlgAbout.setVisible(true);

}else if(e.getSource() == jmenuitemExit){

System.exit(0);

}

// Search for the button pressed until end of array or key found

for (int i=0; i<jbnButtons.length; i++)

{

if(e.getSource() == jbnButtons[i])

{

switch(i)

{

case 0:

addDigitToDisplay(i);

break;

case 1:


break;

case 2:


break;

case 3:


break;

case 4:


break;

case 5:


break;

case 6:


break;

case 7:


break;

case 8:


break;

case 9:


break;

case 10: // +/-

processSignChange();

break;

case 11: // decimal point

addDecimalPoint();

break;

case 12: // =

processEquals();

break;

case 13: // divide

processOperator("/");

break;

case 14: // *

processOperator("*");

break;

case 15: // -

processOperator("-");

break;

case 16: // +

processOperator("+");

break;

case 17: // sqrt

if (displayMode != ERROR_MODE)

{

try

{

if (getDisplayString().indexOf("-") == 0)

displayError("Invalid input for function!");

result = Math.sqrt(getNumberInDisplay());

displayResult(result);

}

catch(Exception ex)

{


displayMode = ERROR_MODE;

}

}

break;

case 18: // 1/x

if (displayMode != ERROR_MODE){

try

{

if (getNumberInDisplay() == 0)

displayError("Cannot divide by zero!");

result = 1 / getNumberInDisplay();


}

catch(Exception ex) {



}

}

break;

case 19: // %


try {

result = getNumberInDisplay() / 100;


}

catch(Exception ex) {



}

}

break;

case 20: // backspace


setDisplayString(getDisplayString().substring(0,getDisplayString().length() - 1));

if (getDisplayString().length() < 1)

setDisplayString("0");

}

break;

case 21: // CE

clearExisting();

break;

case 22: // C

clearAll();

break;

}

}

}

}

void setDisplayString(String s){

jlbOutput.setText(s);

}

String getDisplayString (){

return jlbOutput.getText();

}

void addDigitToDisplay(int digit){

if (clearOnNextDigit)

setDisplayString("");

String inputString = getDisplayString();

if (inputString.indexOf("0") == 0){

inputString = inputString.substring(1);

}

if ((!inputString.equals("0") || digit > 0) && inputString.length() < MAX_INPUT_LENGTH)

{

setDisplayString(inputString + digit);

}

displayMode = INPUT_MODE;

clearOnNextDigit = false;

}

void addDecimalPoint(){


if (clearOnNextDigit)

setDisplayString("");

String inputString = getDisplayString();

// If the input string already contains a decimal point, don't

// do anything to it.

if (inputString.indexOf(".") < 0)

setDisplayString(new String(inputString + "."));

}

void processSignChange(){

if (displayMode == INPUT_MODE)

{

String input = getDisplayString();

if (input.length() > 0 && !input.equals("0"))

{

if (input.indexOf("-") == 0)

setDisplayString(input.substring(1));

else

setDisplayString("-" + input);

}

}

else if (displayMode == RESULT_MODE)

{

double numberInDisplay = getNumberInDisplay();

if (numberInDisplay != 0)

displayResult(-numberInDisplay);

}

}

void clearAll() {


lastOperator = "0";

lastNumber = 0;


clearOnNextDigit = true;

}

void clearExisting(){




}

double getNumberInDisplay() {

String input = jlbOutput.getText();

return Double.parseDouble(input);

}

void processOperator(String op) {

if (displayMode != ERROR_MODE)

{


if (!lastOperator.equals("0"))

{

try

{

double result = processLastOperator();


lastNumber = result;

}

catch (DivideByZeroException e)

{

}

}

else

{

lastNumber = numberInDisplay;

}


lastOperator = op;

}

}

void processEquals(){

double result = 0;


try

{

result = processLastOperator();


}

catch (DivideByZeroException e) {


}

lastOperator = "0";

}

}

double processLastOperator() throws DivideByZeroException {

double result = 0;


if (lastOperator.equals("/"))

{

if (numberInDisplay == 0)

throw (new DivideByZeroException());

result = lastNumber / numberInDisplay;

}

if (lastOperator.equals("*"))

result = lastNumber * numberInDisplay;

if (lastOperator.equals("-"))

result = lastNumber - numberInDisplay;

if (lastOperator.equals("+"))

result = lastNumber + numberInDisplay;

return result;

}

void displayResult(double result){

setDisplayString(Double.toString(result));

lastNumber = result;

displayMode = RESULT_MODE;


}

void displayError(String errorMessage){

setDisplayString(errorMessage);

lastNumber = 0;



}


Calculator calci = new Calculator();

Container contentPane = calci.getContentPane();

// contentPane.setLayout(new BorderLayout());

calci.setTitle("Java Swing Calculator");

calci.setSize(241, 217);

calci.pack();

calci.setLocation(400, 250);

calci.setVisible(true);

calci.setResizable(false);

}

} //End of Swing Calculator Class.

class DivideByZeroException extends Exception{

public DivideByZeroException()

{

super();

}

public DivideByZeroException(String s)

{

super(s);

}

}

class CustomABOUTDialog extends JDialog implements ActionListener {

JButton jbnOk;

CustomABOUTDialog(JFrame parent, String title, boolean modal){

super(parent, title, modal);

setBackground(Color.black);

JPanel p1 = new JPanel(new FlowLayout(FlowLayout.CENTER));

StringBuffer text = new StringBuffer();

text.append("Calculator Information\n\n");

text.append("Developer: Hemanth\n");

text.append("Version: 1.0");

JTextArea jtAreaAbout = new JTextArea(5, 21);

jtAreaAbout.setText(text.toString());

jtAreaAbout.setFont(new Font("Times New Roman", 1, 13));

jtAreaAbout.setEditable(false);

p1.add(jtAreaAbout);

p1.setBackground(Color.red);

getContentPane().add(p1, BorderLayout.CENTER);

JPanel p2 = new JPanel(new FlowLayout(FlowLayout.CENTER));

jbnOk = new JButton(" OK ");

jbnOk.addActionListener(this);

p2.add(jbnOk);

getContentPane().add(p2, BorderLayout.SOUTH);

setLocation(408, 270);

setResizable(false);

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e)

{

Window aboutDialog = e.getWindow();

aboutDialog.dispose();

}

}

);

pack();

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource() == jbnOk) {

this.dispose();

}

}

}

OUTPUT:

Result:

Thus the Scientific calculator program was compiled and executed successfully.

VIVA

Define swing

Swing library is an official Java GUI toolkit released by Sun Microsystems. It is used to create

Graphical user interfaces with Java.

Define JFrame class

JFrame class – It has the components added to the frame are referred to as its contents; these are

managed by the contentPanel. It’s a window with title, border, (optional) menu bar and user-specified

components

Define ActionListener interface

The ActionListener interface is used for handling action events. For example, it's used by a JButton

for button clicks, by JCheckbox for checking and unchecking, by a JMenuItem when an option is

picked and many other graphical components.

Define JButton

JButton - is a component the user clicks to trigger a specific action.

Ex.No:9 DEVELOPING A TEMPLATE FOR LINKED LIST

AIM:

To develop a template for linked list in java.

EXPLANATION

A linked list is a data structure consisting of a group of nodes which together represent a sequence.

Linked list is a dynamic data structure whose length can be increased or decreased at run time. Each

node consists of a data and pointer to the next node. First node in a list is said a head.

Various Operations that can be performed in a list are Inserting a node and deleting a node.

Template - a template is a generic class or other unit of source code that can be used as the basis for

unique units of code.

Import the util package for performing LinkedList operation

Develop a template class string for performing the operations of linked list.

“LinkedList<String> l1=new LinkedList<String>();”

Insert the elements of list using add() and perform all the operations of list.

ALGORITHM:


2. Declare the main function within the class Linked list demo.

3. Insert items in to the list using add() method use addLast() to insert at the end.

4. Display the contents of the lists.

5. Use remove() method to declare a specific element.

6. Use remove() first(0,removeLast() to delete the element at the first and at the last.

7. Display the list and handle the exceptions.

DEVELOPING A TEMPLATE FOR LINKED LIST

import java.util.*;

class LinkedListDemo

{

public static void main(String args[])

{

LinkedList<String> l1=new LinkedList<String>();

l1.add("F");

l1.add("B");

l1.add("D");

l1.add("E");

l1.add("C");

l1.addLast("Z");

l1.addLast("A");

l1.add(1,"A2");

System.out.println("Original contents of l1:" + l1);

l1.remove("F");

l1.remove(2);

System.out.println("Contents of l1 after deletion: " + l1);

l1.removeFirst();

l1.removeLast();

System.out.println("l1 after deleting first and last: " + l1);

String val=l1.get(2);

l1.set(2, val + "Changed");

System.out.println("l1 after change: " + l1); } }

OUTPUT:

E:\SQ>java LinkedListDemo

Original contents of l1:[F, A2, B, D, E, C, Z, A]

Contents of l1 after deletion: [A2, B, E, C, Z, A]

l1 after deleting first and last: [B, E, C, Z]

l1 after change: [B, E, CChanged, Z]

Result:

Thus the Linked list program was compiled and executed successfully.

VIVA

Define Linked list

A linked list is a data structure consisting of a group of nodes which together represent a sequence.

Linked list is a dynamic data structure whose length can be increased or decreased at run time. Each

node consists of a data and pointer to the next node. First node in a list is said a head.

What are the Various Operations in a list

Various Operations that can be performed in a list are Inserting a node and deleting a node.

Define Template

Template - a template is a generic class or other unit of source code that can be used as the basis for

unique units of code.

Ex.No:10 DEVELOP A MULTI THREADED PRODUCER CONSUMER

APPLICATION

AIM:

To develop a multithreaded producer and consumer application in java.

EXPLANATION

A multithreaded program contains two or more parts that can run concurrently. Each part of such a

program is called a thread, and each thread defines a separate path of execution.A multithreading is a

specialized form of multitasking.

Life Cycle of a Thread

New: A new thread begins its life cycle in the new state. It remains in this state until the program

starts the thread. It is also referred to as a born thread.

Runnable: After a newly born thread is started, the thread becomes runnable. A thread in this state is

considered to be executing its task.

Waiting: Sometimes a thread transitions to the waiting state while the thread waits for another thread

to perform a task.A thread transitions back to the runnable state only when another thread signals the

waiting thread to continue executing.

Timed waiting: A runnable thread can enter the timed waiting state for a specified interval of time. A

thread in this state transitions back to the runnable state when that time interval expires or when the

event it is waiting for occurs.

Terminated: A runnable thread enters the terminated state when it completes its task or otherwise

terminates.

ALGORITHM:


2. Create two threads producer and consumer.

3. Declare a constant MAXQUEUE in producer thread.

4. Create an instance for vector named messages to implement a queue.

5. In the run() method of producer thread put the messages on the queue using

putmessages() and suspend the thread for one sec using sleep(1000).

6. Declare the getmessage() method and ceck whether there is any message if no wait for

one.

7. After receiving the message remove the message and return it.

8. Create a constructor to assign values to them.

9. In the run method of consumer class call the getmessage() method of producer thread and

print the message.

10. Suspend the thread for 2 sec using sleep(2000).

11. Create two instances with different name for consumer thread.

12. Display the message.

DEVELOP A MULTI THREADED PRODUCER CONSUMER APLICATION

import java.util.Vector;

class Producer extends Thread {

static final int MAXQUEUE = 5;

private Vector messages = new Vector();

public void run() {

try {

while ( true ) {

putMessage();

sleep( 1000 );

}

}

catch( InterruptedException e ) { }

}

private synchronized void putMessage()

throws InterruptedException {

while ( messages.size() == MAXQUEUE )

wait();

messages.addElement( new java.util.Date().toString() );

notify();

}

// Called by Consumer

public synchronized String getMessage()

throws InterruptedException {

notify();

while ( messages.size() == 0 )

wait();

String message = (String)messages.firstElement();

messages.removeElement( message );

return message;

}

}

class Consumer extends Thread {

Producer producer;

String name;

Consumer(String name, Producer producer) {

this.producer = producer;

this.name = name;

}

public void run() {

try {

while ( true ) {

String message = producer.getMessage();

System.out.println(name + " got message: " + message);

sleep( 2000 );

}

}

catch( InterruptedException e ) { }

}


Producer producer = new Producer();

producer.start();

// Start two this time

new Consumer( "One", producer ).start();

new Consumer( "Two", producer ).start();

}

}

OUTPUT:

E:\SQ>java Consumer

Two got message: Wed Sep 01 11:57:54 GMT+05:30 2010

One got message: Wed Sep 01 11:57:55 GMT+05:30 2010















Result:

Thus the Multithreaded program was compiled and executed successfully.

.

VIVA

Define Multithreading


program is called a thread, and each thread defines a separate path of execution. A multithreading is a


Life Cycle of a Thread

New, Runnable, Waiting, TimedWaiting, Terminated

Defne New state of a thread

A new thread begins its life cycle in the new state. It remains in this state until the program starts the

thread. It is also referred to as a born thread.

Define Runnable state of a thread

After a newly born thread is started, the thread becomes runnable. A thread in this state is considered

to be executing its task.

Define Waiting state of a thread

Sometimes a thread transitions to the waiting state while the thread waits for another thread to

perform a task.A thread transitions back to the runnable state only when another thread signals the

waiting thread to continue executing.

Define Timed waiting state of a thread

A runnable thread can enter the timed waiting state for a specified interval of time. A thread in this

state transitions back to the runnable state when that time interval expires or when the event it is

waiting for occurs.

Define Terminated state of a thread

A runnable thread enters the terminated state when it completes its task or otherwise terminates.

Ex.No:11 GENERATING PRIME NUMBERS AND FIBONACCI SERIES

AIM:

To generate prime numbers and fibonacci series using java.

EXPLANATION

Create 2 array list for each series.

Start the thread for generating prime numbers, this calls the class MyThread1

Thread1 gets the series for prime numbers and add them to arraylist1

Start the thread2 for generating Fibonacci series, this calls the clas MyThread2

Thread1 gets the series for Fibonacci series and add them to arraylist2

retainAll() - This method is used to retain the elements of one list into another. In other word

we can say, it deletes all those elements of current list collection which do not exist in

specified collection object. It copies those elements which are equal in both list collection

objects and deletes rest of the other elements from the specified list. This method returns true

if the list has changed after the call, otherwise false.

Using retainAll() the list is compared and the common values are stored in list1 and displayed

ALGORITHM:


2. Create tow threads MyThread1 and MyThread2.

3. In MyThread1 create instances for piped reader and piped writer.

4. Create a constructor and assign values to them.

5. In mythread2 create instances for pipedreader and piped writer.

6. Create a constructor and assign values to them.

7. Declare a class Multithreaded programming and create two list using ArrayList.

8. Create instances for pipedreader and pipedwriter prl and pwl respectively.

9. Get the Fibonacci series from the stream pr2 and store them in lsit2 by using retainAll()

method and print them.

GENERATING PRIME NUMBERS AND FIBONACCI SERIES

import java.io.*;

import java.util.*;

class MyThread1 extends Thread {

private PipedReader pr;

private PipedWriter pw;

MyThread1(PipedReader pr, PipedWriter pw) {

this.pr = pr;

this.pw = pw;

}

public void run() {

try {

int i;

for (i=1;i<10;i++)

{

int j;

for (j=2; j<i; j++)

{

int n = i%j;

if (n==0)

{

break;

}

}

if(i == j)

{

pw.write(i+"\n");

}

}

pw.close();

} catch (IOException e) {

}

}

}

class MyThread2 extends Thread {

private PipedReader pr;

private PipedWriter pw;

MyThread2(PipedReader pr, PipedWriter pw) {

this.pr = pr;

this.pw = pw;

}

public void run() {

try {

int f1, f2 = 1, f3 = 1;

for (int i = 1; i <10; i++) {

pw.write(f3+"\n");

f1 = f2;

f2 = f3;

f3 = f1 + f2;

}

pw.close();

} catch (IOException e) {

}

}

}

class MultithreadedProgram {

public static void main(String[] args) throws Exception {

ArrayList list1=new ArrayList();

ArrayList list2=new ArrayList();

PipedWriter pw1 = new PipedWriter();

PipedReader pr1 = new PipedReader(pw1);

MyThread1 mt1 = new MyThread1(pr1, pw1);

System.out.println("Prime Numbers: ");

mt1.start();

int item1;

while ((item1 = pr1.read()) != -1){

char ch1=((char) item1);

System.out.print(Character.toString(ch1));

list1.add(Character.toString(ch1));

}

pr1.close();

PipedWriter pw2 = new PipedWriter();

PipedReader pr2 = new PipedReader(pw2);

MyThread2 mt2 = new MyThread2(pr2, pw2);

System.out.println("Fibonacci Numbers: ");

mt2.start();

int item2;

while ((item2 = pr2.read()) != -1){

char ch2=((char) item2);

System.out.print(Character.toString(ch2));

list2.add(Character.toString(ch2));

}

pr2.close();

System.out.println("Elements common to both lists are:");

list1.retainAll(list2);

for(int i=0;i<list1.size();i++){

System.out.print(list1.get(i));

}

}

}

OUTPUT:

E:\SQ>java MultithreadedProgram

Prime Numbers:

2

3

5

7

Fibonacci Numbers:

1

2

3

5

8

13

21

34

55

Elements common to both lists are:

2

3

5

Result:

Thus the program was compiled and executed successfully.

VIVA

Define Multithreading


program is called a thread, and each thread defines a separate path of execution. A multithreading is a


Define retainAll()

This method is used to retain the elements of one list into another. In other word we can say, it deletes

all those elements of current list collection which do not exist in specified collection object. It copies

those elements which are equal in both list collection objects and deletes rest of the other elements

from the specified list. This method returns true if the list has changed after the call, otherwise false.

Ex.No:12 MULTITHREADED GUI APPLICATION

AIM:

To develop a multithreaded GUI application in java.

EXPLANATION

GUI - There are two sets of Java APIs for graphics programming: AWT (Abstract Windowing

Toolkit) and Swing.Java Graphics APIs - AWT and Swing - provide a huge set of reusable GUI

components, such as button, text field, label, choice, panel and frame for building GUI applications.

The java.awt package contains the core AWT graphics classes. The java.awt.event package supports

event handling. The java.awt.geom package contains models for a 2D point like x and y axis.

In this program the application has a ball that moves and bounces off the edges of a rectangle is

designed by using GUI in java.

Move() -Moves the ball to the next position, reversing direction if it hits one of the edges.

getShape() - Gets the shape of the ball at its current position

Using Jcomponent in java add() - Add a ball to the panel.

BounceThread - Shows animated bouncing balls

BallRunnable - A runnable that animates a bouncing ball.

BounceFrame - Usig JFrame frame is designed with panel and buttons

addButton - Adds a button to a container

addBall - Adds a bouncing ball to the canvas and starts a thread to make it bounce

ALGORITHM:

1. Create the class ball which implements a ball which moves and bounces of the edges of a

rectangle.

2. Using the move() method move the ball to the nect postion by reversing the direction if it

bits one of the edges.

3. Get the shapes of the ball at its current position.

4. Invoke the runnable() method to show the animated bouncing balls.

5. Using the sleep() method assign the time for ball to bounce in a given interval of time.

6. Construct the frame with the component for showing bouncing ball and start and close

buttons.

7. Add the thread to the frame and button to the container.

8. Create a constructor to assign values to them.

9. Add a bouncing ball to the canvas and starts a thread to make it bounce.

10. Display the output.

MULTITHREADED GUI APPLICATION

import java.awt.*;


import javax.swing.*;

import java.util.*;

import java.awt.geom.*;

/**

A ball that moves and bounces off the edges of a

rectangle

* @version 1.33 2007-05-17

* @author Cay Horstmann

*/

class Ball

{

/**

Moves the ball to the next position, reversing direction

if it hits one of the edges

*/

public void move(Rectangle2D bounds)

{

x += dx;

y += dy;

if (x < bounds.getMinX())

{

x = bounds.getMinX();

dx = -dx;

}

if (x + XSIZE >= bounds.getMaxX())

{

x = bounds.getMaxX() - XSIZE;

dx = -dx;

}

if (y < bounds.getMinY())

{

y = bounds.getMinY();

dy = -dy;

}

if (y + YSIZE >= bounds.getMaxY())

{

y = bounds.getMaxY() - YSIZE;

dy = -dy;

}

}

/**

Gets the shape of the ball at its current position.

*/

public Ellipse2D getShape()

{

return new Ellipse2D.Double(x, y, XSIZE, YSIZE);

}

private static final int XSIZE = 15;

private static final int YSIZE = 15;

private double x = 0;

private double y = 0;

private double dx = 1;

private double dy = 1;

}

class BallComponent extends JComponent

{

/**

* Add a ball to the panel.

* @param b the ball to add

*/

public void add(Ball b)

{

balls.add(b);

}

public void paintComponent(Graphics g)

{

Graphics2D g2 = (Graphics2D) g;

for (Ball b : balls)

{

g2.fill(b.getShape());

}

}

private ArrayList<Ball> balls = new ArrayList<Ball>();

}

/**

* Shows animated bouncing balls.

* @version 1.33 2007-05-17

* @author Cay Horstmann

*/

public class BounceThread

{

public static void main(String[] args)

{

EventQueue.invokeLater(new Runnable()

{

public void run()

{

JFrame frame = new BounceFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

});

}

}

/**

* A runnable that animates a bouncing ball.

*/

class BallRunnable implements Runnable

{

/**

* Constructs the runnable.

* @aBall the ball to bounce

* @aPanel the component in which the ball bounces

*/

public BallRunnable(Ball aBall, Component aComponent)

{

ball = aBall;

component = aComponent;

}

public void run()

{

try

{

for (int i = 1; i <= STEPS; i++)

{

ball.move(component.getBounds());

component.repaint();

Thread.sleep(DELAY);

}

}

catch (InterruptedException e)

{

}

}

private Ball ball;

private Component component;

public static final int STEPS = 1000;

public static final int DELAY = 5;

}

/**

* The frame with panel and buttons.

*/

class BounceFrame extends JFrame

{

/**

* Constructs the frame with the component for showing the bouncing ball and Start and Close

* buttons

*/

public BounceFrame()

{

setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

setTitle("BounceThread");

comp = new BallComponent();

add(comp, BorderLayout.CENTER);

JPanel buttonPanel = new JPanel();

addButton(buttonPanel, "Start", new ActionListener()

{

public void actionPerformed(ActionEvent event)

{

addBall();

}

});

addButton(buttonPanel, "Close", new ActionListener()

{

public void actionPerformed(ActionEvent event)

{

System.exit(0);

}

});

add(buttonPanel, BorderLayout.SOUTH);

}

/**

* Adds a button to a container.

* @param c the container

* @param title the button title

* @param listener the action listener for the button

*/

public void addButton(Container c, String title, ActionListener listener)

{

JButton button = new JButton(title);

c.add(button);

button.addActionListener(listener);

}

/**

* Adds a bouncing ball to the canvas and starts a thread to make it bounce

*/

public void addBall()

{

Ball b = new Ball();

comp.add(b);

Runnable r = new BallRunnable(b, comp);

Thread t = new Thread(r);

t.start();

}

private BallComponent comp;

public static final int DEFAULT_WIDTH = 450;

public static final int DEFAULT_HEIGHT = 350;

public static final int STEPS = 1000;

public static final int DELAY = 3;

}

OUTPUT:

Result:

Thus the Multithreaded GUI application was compiled and executed successfully.

VIVA

Define GUI

Graphical User Interface (GUI) has graphics classes for developing application. There are two sets of

Java APIs for graphics programming: AWT (Abstract Windowing Toolkit) and Swing.Java Graphics

APIs - AWT and Swing - provide a huge set of reusable GUI components, such as button, text field,

label, choice, panel and frame for building GUI applications

Define java.awt package

The java.awt package contains the core AWT graphics classes.

Define java.awt.event package

The java.awt.event package supports event handling.

Define java.awt.geom package

The java.awt.geom package contains models for a 2D point like x and y axis.

Question Set

1. Develop a Java package with simple Stack and Queue classes. Use JavaDoc

comments for documentation.

2. Design a class for Complex numbers in Java. In addition to methods for basic

operations on complex numbers, provide a method to return the number of active

objects created.

3. Design a Date class similar to the one provided in the java.util package.

4. Develop with suitable hierarchy, classes for Point, Shape, Rectangle, Square, Circle,

Ellipse, Triangle, Polygon, etc. Design a simple test application to demonstrate

dynamic polymorphism.

5. Design a Java interface for ADT Stack. Develop two different classes that implement

this interface, one using array and the other using linked-list. Provide necessary

exception handling in both the implementations.

6. Write a Java program to read a file that contains DNA sequences of arbitrary length

one per line (note that each DNA sequence is just a String). Your program should sort

the sequences in descending order with respect to the number of 'TATA'

subsequences present. Finally write the sequences in sorted order into another file.

7. Develop a simple paint-like program that can draw basic graphical primitives in

different dimensions and colors. Use appropriate menu and buttons.

8. Develop a scientific calculator using even-driven programming paradigm of Java.

9. Develop a template for linked-list class along with its methods in Java.

10. Design a thread-safe implementation of Queue class. Write a multi-threaded

producer-consumer application that uses this Queue class.

11. Write a multi-threaded Java program to print all numbers below 100,000comthat are

both prime and fibonacci number (some examples are 2, 3, 5, 13, etc.). Design a

thread that generates prime numbers below 100,000 and writes them into a pipe.

Design another thread that generates fibonacci numbers and writes them to another

pipe. The main thread should read both the pipes to identify numbers common to

both.

12. Develop a multi-threaded GUI application of your choice.

REFERENCES

http://www.java-examples.com/

www.tutorialspoint.com

http://www.ntu.edu.sg/home/ehchua/programming/java/J4a_GUI.html

“Programming with JAVA” By E.Balagurusamy

K. Arnold and J. Gosling, “The JAVA programming language”, Third edition, Pearson

Education, 2000.

Timothy Budd, “Understanding Object-oriented programming with Java”, Updated Edition,

Pearson Education, 2000.

C. Thomas Wu, “An introduction to Object-oriented programming with Java”, Fourth Edition,

Tata McGraw-Hill Publishing company Ltd., 2006.

http://www.java-examples.com/

http://www.tutorialspoint.com/

http://www.ntu.edu.sg/home/ehchua/programming/java/J4a_GUI.html