Table of Contents 13

8/3/2019 Table of Contents 13

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ST. FRANCIS COLLEGE FOR WOMEN

BEGUMPET, HYDERABAD-500016

CERTIFICATE

DEPARTMENT OF COMPUTER SCIENCE

This is to certify that this is a bonafide project work done by Meghana B

Rao of class B.Sc III D bearing Roll no.095426 in the semester V of the

academic year 2011-2012.

Internal Examiner External

Examiner

Head of Department



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TABLE OF CONTENTS

S.NO. PARTICULARS OF THE RECORD WORK DONE PAGE NO. SIGN

1 Program to illustrate Type conversions

2Program to demonstrate the use of

methods of the Scanner class

3Program illustrating use of input dialog

boxes

4Program using the nested if control

structure

5 Program to illustrate use of switch case

6Program illustrating looping with

sentinel value

7Program to print the multiplication

table of the first ten natural numberusing nested loops.

8Check whether a number is perfect or

not using for loop

9Print the primes from 1 to 100 using

while loop



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10Use do while loop to find sum of squares of first hundred natural

numbers



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11

a. Check if a number is palindromeor not

b. Check if a number is Amstrongnumber or not

c. To generate the first n terms of aGeometric progression, also thefirst n terms of an Arithmeticprogression

12Program to illustrate Passing of arguments to methods by value

13Program illustrating the use of Math

class

14

Recursion-a. To calculate the factorial of anumber

b. To generate the first n terms of the Fibonacci series

15

Single dimensional arrays:a. Sum of elements in a listb. Smallest and largest values in a

listc. Copying arraysd. Passing arrays to methods

e. Returning arrays from methodsf. Variable length argument lists

16Searching in an array using Linear

Search

17Sorting a list of values using Bubble

Sort

18 Program illustrating use of Array class

19

Double Dimensional Arrays:a. Accept and display elements in a

matrix formb. Addition, Subtraction and

Multiplication of matrices usingmethods

c. Transpose of a matrixd. Display the sum of elements of

each row and each column in amatrix



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20Program illustrating the use of default

and parameterised constructors

21Program using the Date, Random, GUI

components classes from the Java

library

22Program using static variables and

static methods

23 Passing objects to methods

24 Program using array of objects

25Overloading:

a. Method overloadingb. Constructor overloading

26Program illustrating Single

inheritance

27Program to illustrate multiple

inheritance

28 Method overriding using super keyword

29 Program using the JFrame class

S.NO. PARTICULARS OF THE RECORD WORK DONE PAGE NO. SIGN

30 Program on polymorphism

31 Program using the ArrayList class

32 Program illustrating the use of Abstractclasses

33 Program based on interfaces

34 Program demonstrating exceptionhandling



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1. Program to illustrate Type Conversions

//Program to illustrate Type conversions-widening and

narrowing of a type

public class Conversions{

public static void main{String args[]){

byte i=124;

int j=i+4; //the value of i is implicitly converted to

integer value(widening)

System.out.println( i +”\t”+j);

//the output is 124 128

float k=12.3;

j=(int)k;

System.out.println( k +”\t”+j);

//here the value of k is explicitly converted to integer

value(narrowing a type)

//this leads to loss of data at times

//the output is 12.3 12

k=i; //widening the data type

System.out.println( k +”\t”+i);

//the output is 124.0 124

// after type casting, the value and data type of i has notbeen altered.

// i is still a byte value

}

}



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2. Write a program to illustrate the use of methods

of the Scanner class

// Program to demonstrate the use of methods of theScanner class

import java.util.Scanner;

public class Scannermethods{

public static void main(String args[]){

//creating an object of the Scanner class

Scanner input=new Scanner(System.in);

int a,b;

System.out.println(“enter two integer values”):

a=input.nextInt(); //using the nextInt() method to accept

integer values

b=input.nextInt();

System.out.println(“enter a byte value”):

byte c=nextByte();

System.out.println(“enter a short value”):

short d= input.nextShort();

System.out.println(“enter a long integer value”):

long x=input.nextLong();

System.out.println(“enter a float value”):

float f=input.nextFloat();



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System.out.println(“enter a double value”):

double y=input.nextDouble();

System.out.println(“enter a character and a word”):

char ch=input.next();

String str=input.next();

System.out.println(“enter a line of text/sentence”):

String str1=input.nextLine();

System.out.println(“the integers entered are :”

a+”\t”+b);

System.out.println(“the other numeric values entered

are :” c+”\t”+d+”\t”+x+”\t”+f+”\t”+y);

System.out.println(“the character, word and sentence

entered are :” ch+”\n”+str+”\n”+str1);

}}

3. Program to illustrate use of input dialog boxes

//computation of simple interest using input dialog boxes

import javax.swing.JOptionPane;

public class InputDialog{

public static void main(String args[]) {

String prompt=JOptionPane.showInputDialog("enter the

principal amount");

double p= Double.parseDouble(prompt);

prompt=JOptionPane.showInputDialog("enter the time in

years");



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float t= Float.parseFloat(prompt);

prompt=JOptionPane.showInputDialog("enter the rate

%");

float r= Float.parseFloat(prompt);

double si=p*t*r/100;

String out="the Simple interest is" +si + "\n the amount

is"+(p+si)+"\n integral parts of the principal and amount

are"+(int)si+"and"+(int)(p+si);

JOptionPane.showMessageDialog(null,out);

}}



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4. Program to determine grades of a student using

nested if control structure

//grades based on marks


public class Grades{


Scanner get=new Scanner(System.in);

char grade;

System.out.println(“enter the marks”);

int marks=get.nextInt();

if(marks>0)

{

if(marks>=75)

grade=’A’;

else if((marks>=60) &&(marks<75))

grade=’B’;

else if((marks>=40) &&(marks<60))

grade=’C’;

else if(marks>=27)

grade=’D’;

else

grade=’F’;

System.out.println(“Student’s marks:”+marks+”\n

Grade:”+grade);

}

else

System.out.println(“Invalid marks”);



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}

}



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5. Program using Switch case


class Daysnum {

public static void main(String[] args) {

Scanner ip=new Scanner(System.in);

System.out.println(“enter the month and year of your

choice example 2 2000 for February 2000”);

int month=ip.nextInt();

int year = ip.nextInt();

countDays(year,month);

}

public static void countDays(int year,int month ){

int numDays = 0;

switch (month) {

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

numDays = 31;

break;

case 4:

case 6:

case 9:

case 11:

numDays = 30;

break;

case 2:

if ( ((year % 4 == 0) && !(year % 100 == 0))



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|| (year % 400 == 0) )

numDays = 29;

else

numDays = 28;

break;

default:

System.out.println("Invalid month.");

break;

}

System.out.println("Number of Days = " + numDays);

}

}



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6. Program illustrating looping with Sentinel value

//sum of values till the user enter the value 0


public class SentinelValue{


int sum=0;

Scanner in=new Scanner(System.in);

int value=in.nextInt();

while(value!=0){

sum+=value;

value=in.nextInt();

}

System.out.println(“the sum of the values entered is”+”sum);

}

}



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7. Program to print multiplication tables of numbers

from 1 to n using nested loops (first ten multiples).

//Program using nested for loop


public class MultTable{



System.out.println(“enter the limit:”);

int n=in.nextInt();

System.out.println(“Multiplication tables

of 1 to” +n +”:\n”);

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

{

System.out.println(“/t”);

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

System.out.println(i+”\t x \t”+

j+”\t=\t”+(i*j)+”\n”);

}

}

}



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8. Program using for loop to find if a number is

perfect or not

//check if a number is perfect number or not


public class Perfect {



System.out.println("enter the number:");

int n=in.nextInt();

perf(n);

}

public static void perf(int n)

{

int sum=0;

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

if(n%p==0)

sum+=p;

}

if (sum==n)

System.out.println(n+"is a perfect no.");

else

System.out.println(n+"is not a perfect no.");

}

}



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9. Program to print primes from 1 to 100 using while

loop

//To generate Prime numbers between 1 and 100


public class Prime {

public static void generate(){

int flag=0;

int i=1;

while(i<=100)

{

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

{

if ( i!=j && i % j == 0 )

{

flag=1;

break;

}

}

if (flag==1)

System.out.println(i+ "\t");

flag=0;

i++;

}

}



generate();

}



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}



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10. Sum of squares of first hundred natural numbers

using do...while loop

//program to find 1^2+2^2+..........+n^2


public class SumSquare{

public static int squaresum(int n){

int sum=0;

int i=1;

do{

sum+=i*i;

i++;

if(i>n)

break;

}while(i<=n);

return sum;

}



System.out.println(“enter the n value”);

int n=input.nextInt();

int sumsq=squaresum(n);

System.out.println(“the sum of the 1st

“+n+”squares=”+sumsq);

}

}



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11a. Palindrome


public class Palindrome{



System.out.println("Enter the number");

int a=in.nextInt();

pal(a);

}

public static void pal(int b){

int d=b;

int d1=0;

int r=0;

while(d>0)

{

r=d%10;d1=r+(10*d1);

d=d/10;

}

if(d1==b)

System.out.println(b+"is a palindrome");

else

System.out.println(b+"is not a palindrome");

}

}



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11b. Amstrong number

//Amstrong number


public class Amstrong {

{

public static void main(String args[])

{

Scanner get=new Scanner(System.in);

Amstrong a=new Amstrong();

System.out.println("enter the number");

int n=get.nextInt();

if(a.sumcube (n)==n)

System.out.println(n + " is Armstrong Number");

else

System.out.println(n + " is not Armstrong Number");

}

}

public static int sumcube(int x)

{

int dig,sum = 0;

while(x >= 1)

{dig = x % 10;

sum = sum + dig * dig * dig;

x = x / 10;

}

return(sum);

}



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}

11c. GP and AP first n terms


public class Gpap{

int i;

public static void gp(int a,int r,int n){

System.out.println(“the GP series is:\n”);

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

System.out.println(a*Math.pow(r,i-1)+”\t”);

}

public static void ap(int a,int d,int n){

System.out.println(“the AP series is:\n”);

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

System.out.println(a+(i-1)*d+”\t”);

}


Scanner sc=new Scanner(System.in);

System.out.println(“enter the first term of both the series:”)

int a=sc.nextInt();

System.out.println(“enter the last term of both the series:”)

int n=sc.nextInt();

System.out.println(“enter the common difference (which willalso be the common ratio for the GP):”);

int r=sc.nextInt();

gp(a,n,r);

ap(a,n,r);

}



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}



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12. Pass by value

//passing arguments by value


public class PassByVal{

public static void main(){

Scanner input= new Scanner(System.in);

int a, b;

System.out.println(“enter the values of a and b”);

a=input.nextInt();

b= input.nextInt();

compute(a,b); //passing a and b values to the user defined

function

}

public static void compute(int a,int b){

System.out.println(“(a+b)^2=”+

(Math.pow(a,2)+2*a*b+Math.pow(b,2));

}

}



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13 Math class

//using Math class functions


public class MathFns{

public static void main(){


System.out.println(“enter the angle in degrees”);

int deg=input.nextInt();

System.out.println(“the value of

sin”+deg+”is”+Math.sin(math.toRadians(deg)));

System.out.println(“enter the base and exponent”);

float base= input.nextFloat();

float exp= input.nextFloat();

System.out.println(base+”to the

power”+exp+”=”+Math.pow(base,exp));

System.out.println(“enter the value for square root andexponent”);

int value= input.nextInt();

System.out.println(“square root=”+Math.sqrt(value)+”\n e

raised to the power”+value+”=”+Math.exp(value));

System.out.println(“the absolute value

of”+value+”is”+Math.abs(value));

System.out.println(“minimum value

of”+base+”and”+exp+”is”+Math.min(base,exp));

if(value<deg)

System.out.println(“a random value

between”+value+”and”+deg+”is”+

value+Math.random()*deg);

else



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System.out.println(“a random value

between”+value+”and”+deg+”is”+

deg+Math.random()*value);

}

}



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14a. Factorial of a number using recursion

// Factorial of a number using recursion


public class Factorial {

public static int fact(int integer)

{

if(integer>0)

{

if( (integer == 0)||(integer==1))

return 1;

else

return(integer*(fact(integer-1)));

}

}


Scanner i=new Scanner(System.in);System.out.println("enter the number for which

factorial is to be found");

int n=i.nextInt();

int f=fact(n);

System.out.println("Factorial of" +n +"is"+f);

}

}

14b. // First n terms of Fibonacci series usingrecursion


public class Fibo {

int f1,f2,f3;

public static void fib(int integer)



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{

if(integer>0){

f3=f1+f2;

System.out.println(f3+”\t”);

f1=f2;

f2=f3;

fib(integer-3);

}

else

System.out.println(“\n this is the end of the series”);

}


Scanner i=new Scanner(System.in);

System.out.println("enter the number of terms inthe Fibonacci series");

int n=i.nextInt();

f1=0;

f2=1;

System.out.println(“the first n terms of theFibonacci series are”+f1+”\t”+f2);

fib(n);

}

}



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15. a Sum of elements in a list

//Sum of elements in a list


class SumMat{

int n,i,sum;

int a[]=new int[10];


void accept(){

System.out.println(“how many values”);

int n=ip.nextInt();

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

a[i]=ip.nextInt();

}

int sum(){

sum=0;

for(i=0;i<n;i++)sum+=a[i];

}

public class M{


SumMat m1=new SumMat();

m1.accept();

System.out.println(“the sum of the elements entered is”+(m1.sum());

}

}



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15b. Smallest and largest values in a list

//minimum and maximum elements in a list of numbers


class Minmax{

int n;



void accept(){


n=ip.nextInt();

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

a[i]=ip.nextInt();

}

void findminmax(){

int min=a[0],max=a[0];

for(int p=1;p<n;p++){if(a[p]>max)

max=a[p];

if(a[p]<min)

min=a[p];

}

System.out.println(“min value=”+min+”max value=”+max);

}

}

public class M{


Minmax m1=new Minmax();

m1.accept();



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m1.findminmax();

}

}

15c. Copying arrays


class ArrayCopy{

int n,i;


void accept(){



int n=ip.nextInt();


a[i]=ip.nextInt();

}

void copyarray(){

int copya[]=new int[10];

for(i=0;i<a.length;i++)

copya[i]=a[i];

}

void display()

{

System.out.println(“the source array is”)

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

System.out.println(a[i]+”\t”);

System.out.println(“the target array is”)

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

System.out.println(copya[i]+”\t”);

}



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}

public class M{


ArrayCopy a=new ArrayCopy();

a.accept();

a.copyarray();

a.display();

}

}

15d. Passing arrays to methods

import java.util.Scanner;class Passarray{


{

int [] a=new int[10];

int i,n;


System.out.println("\nhow many values");n=in.nextInt();

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

a[i]=in.nextInt();

System.out.println("\nthe elements of the array are\n");

parray(a,n);

}

public static void parray(int [] x,int n){


System.out.println(x[i] + "\n");

}

}



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15e. Returning arrays from methods


class Revarray{


{

int [] a=new int[10];

int [] b=new int[10];

int i,n;


System.out.println("\nhow many values");

n=in.nextInt();

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

a[i]=in.nextInt();

System.out.println("\nthe elements of the array A\n");

parray(a,n);

b=reverse(a,n);

System.out.println("\nthe elements of the array B\n");

parray(b,n);

}

public static void parray(int [] x,int x1)

{

for(int i=0;i<x1;i++)

System.out.println(x[i] + "\n");

}

public static int [] reverse(int [] list,int x)

{

int [] r=new int[x];

for(int i=0,j=x-1;i<x;i++,j--)

{

r[j]=list[i];

}

return r; }}



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15f. Variable length argument list


class varargs{


{

printarray(2,4,6,8,10);//passing variable-length arg listprintarray(new int[] {1,2,4});//pass an array arg

}

public static void printarray(int...n)

{

if (n.length==0)

{ System.out.println("no arguments passed");

return;

}

int r=n[0];

for(int i=1;i<n.length;i++)

{

if (n[i]>r)

r=n[i];

}

System.out.println("\nthe max value is "+ r);}

}



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16. Linear search


public class LinSearch{

int n,search;


Scanner i=new Scanner(System.in);

void accept(){

System.out.println(“how many elements”);

int n=i.nextInt();

for(int s=0;s<n;s++)

a[s]=i.nextInt();

}

void lsearch(){

int flag=0;

System.out.println(“enter the element to be searched”);

int search=i.nextInt();for(int j=1;j<n;j++){

if(a[j]= =search)

{

flag=1;

break;

}

}

if(flag==1)

Sytem.out.println(search+” is found at”+ (j+1) +”location”);

else

Sytem.out.println(search+” not found”);

}



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}

public class LiSrch{


LinSearch l=new LinSearch();

l.accept();

l.lsearch();

}

}



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17. Bubble sort


public class BubbleSort {

int intArray[] = new int[10];


System.out.println(“enter number of elements”);


int n=in.nextInt();

System.out.println(“enter the”+n+”elements”);

for(int t=0;t<n;t++)

intArray[t]=in.nextInt();

System.out.println("Array Before Bubble Sort");

display(intArray);

bubbleSort(intArray);

System.out.println("Array After Bubble Sort");

display(intArray);}public static void display(int []intArray){

for(int j=0; j < intArray.length; j++)

System.out.print(intArray[j] + " ");

}

public static void bubbleSort(int[] intArray) {

int n = intArray.length;

int temp = 0;

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

for(int j=1; j < (n-i); j++){

if(intArray[j-1] > intArray[j]){

temp = intArray[j-1];



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intArray[j-1] = intArray[j];

intArray[j] = temp; }}}}

18. Using the Array class

import java.util.Arrays;


public class ArrayClass {

public static void main(String args[] ) {

Scanner sc=new Scanner(System.in);

int [] n=new int[10];

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

int num=sc.nextInt();

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

n[i]=sc.nextInt();

java.util.Arrays.sort(n);

System.out.println("\the sorted list is");

display(n);java.util.Arrays.sort(n,1,3);//sorts from location 1 to 3-1

display(n);

int [] a1={2,4,6,8};

int [] a2={2,4,6,8};

System.out.println(java.util.Arrays.equals(a1,a2));

java.util.Arrays.fill(a1,7);//fills 7 in the entire array

display(a1);

java.util.Arrays.fill(a2,1,3,9);//fills 9 in the partial array

display(a2);

}

public static void display(int[] a){



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

System.out.println(a[i]);}}



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19.a. Accept and display elements in the matrix form


class Matrix{

int [][]a=new int[10][10];


int i,j;

void accept(int r,int c){

System.out.println(“enter elements of the matrix”);

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

{

for(j=0;j<c;j++)

a[i][j]=input.nextInt();

}

void display(int r,int c){

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

{

System.out.println(“\n”);

for(j=0;j<c;j++)

System.out.println(a[i][j]+”\t”);

}

}

}

public class Call{


Scanner inp=new Scanner(System.in);

Matrix m=new Matrix();



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System.out.println(“enter the order of the matrix”);

row=inp.nextInt();

col=inp.nextInt();

m.accept(row,col);

m.display(row,col);

}

}

19b. Addition subtraction multiplication using

methods


class MatrixOpns{

int [][]a=new int[5][5];

int[][]b=new int[5][5];

int [][]c=new int[5][5];

int i,j,k;


int[][] accept(int r,int co){

System.out.println(“enter the elements of the matrix”);

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

{

for(j=0;j<co;j++)

a[i][j]=in.nextInt();

}

return a;

}

int[][] addmat(int [][]a,int[][]b,int r,int c){

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



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{

for(j=0;j<c;j++)

c[i][j]=a[i][j]+b[i][j];

}

}

int[][] submat(int [][]a,int[][]b,int r,int co){

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

{

for(j=0;j<c;j++)

c[i][j]=a[i][j]-b[i][j];

}

}

int[][] multmat(int[][]a1,int[][]a2,int row1,int col1,int col2){

for(i=0;i<row1;i++)

for(j = 0; j < col2; j++) {

array3[i][j]=0;

for(k = 0; k < col1; k++){

array3[i][j] += array1[i][k]*array2[k][j];

}

}

}

}

void display(int[][]array,int r,int c){

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

{

for(j=0;j<c;j++)

System.out.println(array[i][j]);



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}

}

}

public class Call{



System.out.println(“enter the order of the matrix1”);

int row1=input.nextInt();

int col1=input.nextInt();

System.out.println(“enter the order of the matrix2”);

int row2=input.nextInt();

int col2=input.nextInt();

int [][]array1=new int[5][5];



System.out.println(“the first matrix:\n);

MatrixOpns mo=new MatrixOpns();

array1[][]=mo.accept(row1,col1);

MatrixOpns mo1=new MatrixOpns();

System.out.println(“the second matrix:\n”);

array2[][]=mo1.accept(row2,col2);

if((row1==row2)&&(col1=col2))

{

array3[][]=mo.addmat(array1,array2,row1,col1);

display(array3,row1,col1);

}

else



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System.out.println(“addition not possible\n”);

if((row1==row2)&&(col1=col2))

{

array3[][]=mo.submat(array1,array2,row1,col1);


}

else

System.out.println(“subtraction not possible\n”);

if(col1==row2){

array3[][]=mo.multmat(array1,array2,row1,col1,col2);


}

else

System.out.println(“multiplication not possible\n”);

}

}

19c. Transpose of a matrix


class MatrixOpns{


int i,j;


void accept(int r,int co){


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

{

for(j=0;j<co;j++)



4


}

}

void transpose(int r,int co){

int [][]trans=new int[5][5];

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

{

for(j=0;j<c;j++)

trans[i[j]=a[j][i];

}

}


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

{


for(j=0;j<c;j++)

System.out.println(a[i][j])+”\t”);

}

}

}

public class Call{




int row=input.nextInt();

int col=input.nextInt();




4

mo.accept(row,col);

mo.transpose(row,col);

mo.display(row,col);

}

}

19d. Sum of each row and column elements


class MatrixOpns{


int i,j;


void accept(int r,int co){


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

{

for(j=0;j<co;j++)


}

}

void SumRowCol(int r,int co){

int sumrow=0;

int sumcol=0;

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

{

sumrow=sumcol=0;

System.out.println(“\n Sum of”+(i+1)+”th row elements and

+(j+1)+”th column are respectively: \t ”);



4

for(j=0;j<c;j++){

sumrow+=a[i][j];

sumcol+=a[j][i];

}

System.out.println(sumrow+”\t”+sumcol);

}

}


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

{


for(j=0;j<c;j++)

System.out.println(a[i][j])+”\t”);

}

}

}

public class Call{




int row=input.nextInt();

int col=input.nextInt();


mo.accept(row,col);

mo.display(row,col);

mo.SumRowCol(row,col);

}



4

}



4

20. Default and parameterised constructors with ternary

operators

//ternary operator with constructors example


public class Check{

int n;

Check()

{

n=0;}

Check(int p)

{

n=p;

}


{

Check c1-new Check();

Check c2=new Check(5);

int min;

min=((c1.n)<(c2.n))? (c1.n):(c2.n);

System.out.println(“minimum value is”+min);

}

}



4

21. Date, Random, GUI classes


import javax.swing.JFrame;

public class LibraryClasses{


java.util.Date d=new java.util.Date();

System.out.println(“Time elapsed since Jan

1,1970:”+d.getTime()+”milliseconds”);

String s=d.toString();

System.out.println(s);

java.util.Random r= new java.util.Random();


System.out.println(“enter the limit:”);

int n=in.nextInt();

System.out.println(“ten random values between 0

and”+n+”are\n”);

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

System.out.println(r.nextInt(n)+”\t”);

Jframe f1=new JFrame();

JButton jok=new JButton(“OK!”);

JLabel jlb=new JLabel(“Time elapsed since 1 Jan,1970:”);

JTextField tf=new JTextField(s);

f1.add(jlb);

f1.add(tf);

f1.add(jok);

f1.setTitle(“Current Time”);

f1.setSize(200,150);



4

f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f1.setVisible(true); }}

22. Static methods and variables

class Circle{

double radius;

static int nobj=0;

final static double pi=3.14159;

Circle(){

radius=0.0;

nobj++;

}

Circle(double r){

radius=r;

nobj++;

}

static int getobj(){

return nobj;

}

void displayarea(){

System.out.println(“area=”+(radius*radius*pi);

}

}

public class Call{


Circle c1=new Circle();

System.out.println(“the number of objects

created=”+c1.getobj());



4

Circle c2=new Circle(5);

System.out.println(“the number of objects

created=”+c2.getobj() +”\n the area is”+c2.displayarea() );

}}

23. Passing objects to methods


class obj

{

private int r=1;

private static int nobj=0;

public obj(){nobj++;}

public obj(int i){r=i;nobj++;}

public int get(){return r;}

public void set(int i){r=(i>0) ? i : 0; }

public static int getnobj() { return nobj;}

public int calculate(){return r*r*2; }

}

public class Passobj{


{

obj o=new obj(3);

disp(o);

}

public static void disp(obj o1)

{

System.out.println("\nthe value of r"+o1.get() +"calculated

value=" + o1.calculate());

}

}



4

24. Array of objects


class Sample{


int a,b;

void accept(){

a=input.nextInt();

b=input.nextInt();

}

void calculate(){

System.out.println(“Sum of the values=”+(a+b));

}

}

public class Call{


Sample []s=new Sample[5];

for(int j=0;j<5;j++)

{

s[j]=new Sample();

s[j].accept();

s[j].calculate();

}

}

}



4

25. a. Method overloading


class Overload{


int a,b;

float c,d;


System.out.println("\naccept 2 integer values");

a=in.nextInt();

b=in.nextInt();System.out.println("\naccept 2 float values");

c=in.nextFloat();

d=in.nextFloat();

System.out.println("\ncalling function int\n");

pcall(a,b);

System.out.println("\nalling function float\n");

pcall(c,d);}

public static void pcall(int x, int y)

{

System.out.print(x + "\t" + y);

}

public static void pcall(float x,float y)

{

System.out.print(x + "\t" + y);

}

}



4

25 b. Constructor overloading

public class COverload{

int i;

COverload(){

i=0;

System.out.println(“the default constructor has been

invoked\n the value of i is”+i);

}

COverload(int p){

i=p;

System.out.println(“the parameterised constructor taking an

integer parameter has been invoked\n the value of i is”+i);

}

COverload(String str){

System.out.println(“the parameterised constructor taking a

String parameter has been invoked\n the message is”+str);

}

}

public class Call{


COverload c1=new COverload();

COverload c2=new COverload(5);

COverload c3=new COverload(“Java Programming”);

}

}



4

26 Single inheritance


class A{

int x,y;Scanner in=new Scanner(System.in);

void gdata()

{

System.out.println("accept 2 values");

x=in.nextInt();

y=in.nextInt();

}void display(){

System.out.println("\nthe sum of the values is"+ (x+y));

} }

class B extends A{

int c,d;

void display1(){

c=10;

d=20;

System.out.println("\nthe product of”+x+”and”+y+ is"+

(x*y));

System.out.println("\tand the difference is"+ (x-y));

System.out.println("\nthe product of”+c+”and”+d+ is"+

(c*d));

System.out.println("\tand the difference is"+ (c-d));

}}

class Inherit{


B b1=new B();

b1.gdata();



4

b1.display1();

b1.display();}}

27. Multiple inheritance

class A {

int x;

int y;

int get(int p, int q){

x=p;

y=q;

return(0);

}

void Show(){

System.out.println(x+”\t”+y); }}

class B extends A{

void Showb(){

System.out.println("the values for object of class

B:"+get(5,6));

Show();

}}

class C extends A{

void display(){

System.out.println("the values for object of class

C:"+get(15,16));

Show();}}

public class Call{


C c = new C();

c.display();



4

B b=new B();

b.Showb();

c.get(7,8);

c.Show(); }}



4

28. Method overriding using super keyword

// Method overriding

class A {

int i, j;

A(int a, int b) {

i = a;

j = b;

}

// display i and j

void show() {

System.out.println("i and j: " + i + " " + j);

} }

class B extends A {

int k;

B(int a, int b, int c) {

super(a, b);

k = c;

}

void show() {

super.show(); // this calls A's show()

System.out.println("k: " + k);

} }

class override1 {


B subOb = new B(1, 2, 3);



4

subOb.show(); // this calls show() in B

} }



4

29. Program using the JFrame class

import javax.swing.*;

public class kframe{


JFrame f1=new CustomFrame();

f1.setTitle("Official Student Information");

f1.setLocation(200,100);

f1.setVisible(true);

JFrame f2=new CustomFrame();

f2.setTitle("Duplicate record of student information");

f2.setLocation(200,300);

f2.setVisible(true);

}}

class CustomFrame extends JFrame {

public CustomFrame() {

JButton jok=new JButton("OK");

JLabel label2=new JLabel("Select your combination");

JLabel label3=new JLabel("Gender");

JLabel label1=new JLabel("Enter your name");

JTextField tf1=new JTextField("Type name here");

JCheckBox jck=new JCheckBox("I am above 18 years of

age");

JRadioButton jrd=new JRadioButton("Male");

JRadioButton jrd1=new JRadioButton("Female");

JComboBox jcb=new JComboBox(new String[]

{"MECs","MSCs","MPCs","BZC"});

JPanel p=new JPanel();



4

p.add(label1);

p.add(tf1);

p.add(jck);

p.add(label3);

p.add(jrd);

p.add(jrd1);

p.add(label2);

p.add(jcb);

add(p);

p.add(jok);

setSize(450,270);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}}



4

30.Polymorphism

class Shape {

void Area() {

System.out.println("No dimensions hence area cannot be

calculated");

}

}

class Circle extends Shape {

void Area() {

float r=4.5;

System.out.println("Area of circle="+(Math.PI*r*r));

}

}

class Square extends Shape {

void Area() {

int s=5;

System.out.println("Area of square:"+(s*s));

}

}

class Traingle extends Shape{

void Area() {

float base=4.5;

float ht=4.3;

System.out.println("Area of right angled

triangle:"+(0.5*base*ht));

}

}



4

class poly {


Shape obj1 = new Shape();

Shape obj2 = new Circle);

Shape obj3 = new Square();

Shape obj4 = new Triangle();

obj1.Area();

obj2.Area();

obj3.Area();

obj4.Area();

}

}



4

31.Array list class

import java.util.ArrayList;

public class alist

{


{

ArrayList<String> subjects=new ArrayList<String>();

subjects.add("Mathematics");

subjects.add("Electronics");

subjects.add("Computer Science");

subjects.add("Chemistry");

subjects.add("Botany");

System.out.println("list size? " + subjects.size());

System.out.println("is Physics in the list " +

subjects.contains("Physics"));

System.out.println("the location of Chemistry in the list " +

subjects.indexOf("Chemistry"));

System.out.println("is the list subjects empty" +

subjects.isEmpty());

subjects.add(2,"Physics");

subjects.remove("Chemistry");

subjects.remove(1);

System.out.println(subjects.toString());

for(int i=subjects.size()-1;i>=0;i--)

System.out.println(subjects.get(i) + " " );

}}



4

32.Abstract classes

abstract class A {

abstract void callme();

abstract void call();

// non-abstract method

void callmetoo() {

System.out.println("This is a concrete method.");

}

}

class B extends A {

void callme() {

System.out.println("B's implementation of callme.");

}

void call(){

System.out.println(“B’s implementation of call”);

}

}

class AbstractDemo {


B b = new B();

b.callme();b.callmetoo();

}

}



4

33. Interfaces

public class Sample {


shape circleshape=new circle();circleshape.Draw();

}

}

interface shape

{

public String baseclass="shape";

public void Draw();}

class circle implements shape

{

public void Draw() {

System.out.println("Drawing Circle here");

}

}



34. Exception handling


public class exceptionHandle{

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

try{

int a,b;

Scanner in =

new Scanner(System.in));

a = in.nextInt();

b = in.nextInt();

}

catch(NumberFormatException ex){

System.out.println("This is not a numeric value.");

}

try{

int a[] = new int[2];

System.out.println("Access element three :" + a[3]);

}catch(ArrayIndexOutOfBoundsException e){

System.out.println("Exception thrown :" + e);

}

System.out.println("Out of the block");

}

Documents

Table of Contents 13