Java Programming Lab Part 1

05/12/2014 "HereToHelpYou":JavaProgrammingLabPart1

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Thursday, August 30, 2012

JavaProgrammingLabPart1

Ex. No: Rational Number RepresentationAim:To write a program for Rational Number RepresentationAlgorithm:Step 1: Start the ProgramStep2:Define a Class called fractionStep 3:In the class Define a Function frac() to find greatest common divisorStep 4:Define another class called ration with main() functionStep 5:In the main() get the input()Step 6:Create an Object for class fractionStep 7:Calculate the numerator and denominator using the function frac() Step 6:Then print the

number as numerator/denominator

Program:import java.io.*;classfraction{int frac(int a,int b){int x,y,i;for(i=min(a,b);i>0;i--){x=a%i; y=b%i; if((x==0)&&(y==0)) break;}return i;}int min(int a,int b){ if(a>b) return b; else return a;}}class ration{

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public static void main(String args[]){int a,b,c,nu,di;System.out.println("Enter the numerator and denominator values:"); DataInputStream din=newDataInputStream(System.in);String x=din.readline();a=Integer.parseInt(x);String y=din.readline() b=Integer.parseInt(y); fraction f=new fraction(); c=f.frac(a,b);nu=a/c;di=b/c;System.out.println("The fraction is"+nu+"/"+di);}}Result:Thus the Program for rational number representation is executed SucessfullyOutput:Enter the Numerator and Denominator Values:355The fraction is 7/1

Ex. No: Packages and JavaDocAim:To write a program to implement the lisp listAlgorithm:Step 1:Start the ProgramStep 2: Define a class called ListStep 3:In it define a method cons() for getting the elements to be insertedStep 4:Define another method car() to display the first element list Step 5:Define cdr() method to

display the remaining elements of list Step 6:Define another class lisp with main() functionStep 6:In it create an object for List class and get a choiceStep 7: If choice is 1,call the cons() function

Step 8:ElseIf choice is 2,call the car() function Step 9:ElseIf choice is 3,call the cdr() function

Step 10:ElseIf choice is 4,Exit the program Step 11:Goto step 6Step 12:Stop the programProgram:import java.io.*; import java.util.*; import java.lang.String; class Lisp{public static void main(String[] args)throws IOException{int ch;boolean x=true;list lis=new list();DataInputStream d=new DataInputStream(System.in);System.out.println("Lisp list implementation"); System.out.println("\n\tOPTIONS\tACTIONS");System.out.println("\t~~~~~~~~~\t\t~~~~~~"); System.out.println("\t1:cons\tInsert a newelements"); System.out.println("\t2:car\t\tShows the first element in the list");System.out.println("\t3:cdr\t\tShows the rest of the element in the list");System.out.println("\t4:exit\tEnds the program");System.out.println();while(x){System.out.println("\nEnter the choice"); ch=Integer.parseInt(d.readLine()); switch(ch){case 1: lis.cons(); break; case 2: lis.car(); break; case 3: lis.cdr();

break; case 4: x=false;System.out.println("EXIT");break;default:System.out.println("Invalid Choice");}}}}class List{int in,n=0;LinkedList l=neew LinkedList();DataInputStream dis=new DataInputStream(System.in);void cons()throws IOException{System.out.println("Enter the element to be inserted");in=Interger.parseInt(dis.readLine());l.addFirst(in);

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n++;System.out.println("After insertion"); System.out.println(l);}void car(){System.out.println("The first element in the list");System.out.println(l.getFirst());}void cdr(){System.out.println("The rest of the element in the list are"); System.out.println("[");for(int i=1;i



{String dl;int d;public void getDollar()throws IOException{DataInputStream dis2=new DataInputStream(System.in); System.out.println("Enter the $ tostore:"); dl=dis2.readLine();d=Integer.parseInt(dl);}public String toString(){return "Entered Doller value="+dl+"and Eqivalent Rupee value="+d*50;}}class Currency{public static void main(String args[])throws IOException{Rupee rin=new Rupee();rin.getRupee();Dollar din=new Dollar();din.getDollar();try{FileOutputStream fos=new FileOutputStream("file1.dat"); ObjectOutputStream oos=newObjectOutputStream(fos); oos.writeObject(rin);oos.flush();oos.writeObject(din); oos.flush(); oos.close();}catch(Exception e){System.out.println("Exception during serialization:"+e); System.out.println(0);}Rupee rout;Dollar dout;try{FileInputStream fis=new FileInputStream("file1.dat");ObjectInputStream ois=new ObjectInputStream(fos); rout=(Rupee)ois.readObject();System.out.println(rout); dout=(Dollar)ois.readObject(); System.out.println(dout);ois.close();}catch(Exception e){System.out.println("Exception during deserialization:"+e);System.out.println(0);}}}Result:Thus the program for currency conversion is implemented and executed successfullyOutput:Enter the Rs to store:12Enter the $ to store:50Entered Rupee value=12Entered Dollar value=50Equivalent value=2500Ex. No: Packages and JavaDocAim:

To develop a Java package with simple Stack and Queue classes and Use JavaDoc commentsfor documentation.Algorithm:Step 1. StartStep 2. Create two classes, Stack and Queue.Step 3. Add the line, package ckage_name>,inthefirstlineofbothclasses.Step4.Savethe.javafilesoftheclassesinafolderwiththesamenameaspackage_name.

Step 5. Create objects using main program for both Stack and Queue classes in separate files, import thepackage in the main as import package_name.class_name; and save them in the same path as thatof the package.Step 6. Add comments to the classes in the package using Java docStep 7. Set the path variable to the path where execution will happen.Step 8. Change the directory to package_name.Step 9. Compile the classes. The .class file must be in the same location as that of the

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.java fileStep 10. Go to bin dir and compile the main programStep 11. To view the Javadoc , javadoc d irname>ckage_name>Step12.AhtmlfilefortheJavadocumentationwillbecreated.Step 13. Stop.Program:/*Queue.java*/package pack;/**Queue with insert and delete operations@param otherPerson The person being compared to the calling object.@return Returns true if the calling object equals otherPerson./public class Queue{int queue[]=new int[10];int foq,roq;public Queue(){foq=-1;roq=-1;}public void ins(int item){if(foq==9 && roq==9) System.out.println("Queue is full"); else if(foq==-1 && roq==-1){queue[++roq]=item;++foq;}

else queue[++roq]=item;}public void del(){int k;if(foq==-1)System.out.println("Q is empty");else{

k=queue[foq++]; System.out.println("Deleted value:"+k);

}}}/*Stack.java*//** This class defines an integer stack that can hold 10 values.*/package pack;public class Stack {int stck[] = new int[10];int tos;// Initialize top-of-stack public Stack() {tos = -1;}// Push an item onto the stack public void push(int item) { if(tos==9) System.out.println("Stack is

full.");

elsestck[++tos] = item;}// Pop an item from the stack public int pop() {if(tos < 0) {System.out.println("Stack underflow.");return 0;}elsereturn stck[tos--];}}/*Qpackage.java*/ import pack.Queue; class Qpackage{public static void main(String args[]){Queue q1=new Queue();



// Add some numbers onto the Queue for(int i=0; i



this.a += c2.a;this.b += c2.b;}public void subtract(ComplexNumber c2) {this.a -= c2.a;this.b -= c2.b;}public void divide(ComplexNumber c2) {double c = this.a;this.a = (this.a * c2.a + this.b * c2.b)/(c2.a * c2.a + c2.b * c2.b);this.b = (c * c2.b*-1+ this.b * c2.a)/(c2.a * c2.a + c2.b * c2.b);}public void multiply(ComplexNumber c2) {double c = this.a;this.a = this.a * c2.a - this.b * c2.b;this.b = c * c2.b + this.b - c2.a;}public String toString1(){return a + " + " + b + "i";}}class comp{public static void main(String args[])throws IOException{ComplexNumber c1=new ComplexNumber(3,4); ComplexNumber c2=new ComplexNumber(1,5);

DataInputStream in = new DataInputStream (System.in);

System.out.println("Enter 1. Addition 2.Subtraction 3.Division 4.Multiplication:"); String numberip =

in.readLine();

String a;switch (i){

case 1: c1.add(c2); a=c1.toString1(); System.out.println(a); break;

case 2: c1.subtract(c2); a=c1.toString1(); System.out.println(a); break;

case 3: c1.divide(c2); a=c1.toString1(); System.out.println(a); break;

case 4: c1.multiply(c2); a=c1.toString1(); System.out.println(a); break;default:System.out.println("Unknown object!");break;}System.out.println("No of active objects in this program"); System.out.println(c1.count);

}}Result:

Thus a class for Complex numbers with all methods for basic operations on complexnumbers and also with a method that returns the number of active objects was created andexecuted successfully.Output:C:\Program Files\Java\jdk1.6.0\bin>javac comp.java Note: comp.java uses or overrides a

deprecated API. Note: Recompile with -Xlint:deprecation for details.

C:\Program Files\Java\jdk1.6.0\bin>java compEnter 1. Addition 2.Subtraction 3.Division 4.Multiplication:14.0 + 9.0iNo of active objects in this program2C:\Program Files\Java\jdk1.6.0\bin>java compEnter 1. Addition 2.Subtraction 3.Division 4.Multiplication:22.0 + -1.0iNo of active objects in this program2C:\Program Files\Java\jdk1.6.0\bin>java compEnter 1. Addition 2.Subtraction 3.Division 4.Multiplication:30.8846153846153846 + -0.4230769230769231i

int i = Integer.parseInt(numberip);



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No of active objects in this program2C:\Program Files\Java\jdk1.6.0\bin>java compEnter 1. Addition 2.Subtraction 3.Division 4.Multiplication:4-17.0 + 18.0iNo of active objects in this program2C:\Program Files\Java\jdk1.6.0\bin>

Remaining programs is continued in Part 2

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Java Programming Lab Part 1