Program 1 Program: WAP in java to print “Hello World”.

class Hello { public static void main(String args[ ])

{ System.out.println("Hello World");

} }

Program 2

Program: WAP in java to implement programs to define a class and

instantiate its object.

import java.io.*;

class Student { int sid;

String sname,sadr,sfname,smname; BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

public void input()throws IOException { System.out.println("please input sid,name,fname and mname");

sid=Integer.parseInt(br.readLine()); sname=br.readLine();

sfname=br.readLine(); smname=br.readLine(); }

public void display() {

System.out.println("Student's id="+sid); System.out.println("Student's name="+sname); System.out.println("Student's father name="+sfname);

System.out.println("Student's mother name="+smname); }

} class object {

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

Student s=new Student(); s.input(); s.display();

} }

Program 3 Program: WAP in java to implement constructor and method overloading.

class demo {

int area(int a) {

return(a*a); } int area(int a,int b)

{ return(a*b);

} double area(double a) {

return(3.14*a*a); }

} class room {

public static void main(String args[]) {

demo d=new demo(); System.out.println("Area of square="+d.area(5)); System.out.println("Area of rectangle="+d.area(6,4));

System.out.println("Area of circle="+d.area(1.25)); }

}

Program 4

Program: WAP in java to implement Command line argument.

class ComLineTest

{ public static void main(String args[ ])

{ int count,i=0; String s;

count=args.length; System.out.println("Number of arguments="+count);

while(i<count) { s=args[i];

i=i+1; System.out.println(i+":"+"java is"+s+"!");

} } }

Program 5

Program: WAP in java to implement String class.

class abc {

public static void main(String args[]) {

int n,i,j; String s=new String("manju"); System.out.println(" Length of String="+s.length());

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

{ for(j=0;j<=i;j++) System.out.print(s.charAt(j));

System.out.print("\n"); }

} }

Program 6

Program: WAP in java to implement 2D-Arrays.

import java .io.*;

class element {

public static void main(String args[ ])throws IOException { int a[ ][ ]=new int[3][3];

int i,j; BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("please input nine elements for matrices"); for(i=0;i<3;i++) for(j=0;j<3;j++)

a[i ][ j]=Integer.parseInt(br.readLine()); System.out.println("the matrices");

for(i=0;i<3;i++) { for(j=0;j<3;j++)

System.out.println(a[i][j]+"\t"); System.out.println("\n"); }

} }

Program 7

Program: WAP in java to implement Multi-level inheritance.

import java.util.*; class multilevel {

static Scanner sc=new Scanner(System.in); static class A {

int a1,a2;

void getdata() {

System.out.println("Enter the value of a1 is:"); a1=sc.nextInt();

System.out.println("Enter the value of a2 is:"); a2=sc.nextInt(); }

void putdata() {

System.out.println("\n The value of a1 is:"+ a1 +" and a2:"+ a2); } }

static class B extends A {

int b1; void add() {

b1=a1+a2; System.out.println("\n The Sum is:"+b1); } }

static class C extends B { int c1; void mul() {

c1=b1*a1;

System.out.println("The product is :"+c1); } }

public static void main(String args[]) {

C obj=new C(); obj.getdata(); obj.add(); obj.mul(); } }

Program 8

Program: WAP in java implement the use of interface.

interface my

{ public void show();

} class demo implements my {

public void show() {

System.out.println("This is interface program"); } }

class sks {

public static void main(String args[]) { demo d=new demo();

d.show(); } }

Program 9

Program: WAP in java implement method overriding.

class One

{ void display()

{ System.out.println("I am class One"); }

} class Two extends One

{ void display() {

System.out.println("I am class Two"); }

} class Overriding {

void display() { System.out.println("I am from class override");

} public static void main(String args[])

{ Overriding obj=new Overriding(); obj.display();

Two t=new Two(); t.display();

} }

Program 10

Program: WAP in java to implement Multithreading.

class A extends Thread {

public void run() {

for(int i=1;i<5;i++) { System.out.println("\t from Thread A:"+i);

} System.out.println("Exit from Thread A");

} } class B extends Thread

{ public void run()

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

System.out.println("\t from Thread B:"+j); }

System.out.println("Exit from Thread B"); } }

class threadtest {

public static void main(String args[]) { A ob=new A();

B ob1=new B(); ob.start();

ob1.start(); } }

Program 11

Program: WAP in java to implement Exception Handling.

class Error {

public static void main(String args[]) {

int a=10,b=5,c=5,x,y; try {

x=a/b-c; }

catch(Exception e) {} {

System.out.println("Division by zero"); }

y=a/b+c; System.out.println("y="+y); }

}

Program 12

Program: WAP in java to implement User-defined and pre-defined packages.

package package1;

public class A {

public void display() { System.out.println("This is class A");

} }

import package1.A; class Packagetest1 {

public static void main(String args[]) {

A obj=new A(); obj.display(); }

}

Program 13

Program: WAP in java to implement applet using Graphics class.

import java.awt.*;

import java.applet.*; import java.net.*;

public class star extends Applet { public void paint(Graphics g)

{ g.setColor(Color.green);

int x[ ]={80,100,150,120,150,80,0,30,0,50}; int y[ ]={10,40,40,70,120,90,120,70,40,40}; g.drawPolygon(x,y,10);

g.fillPolygon(x,y,10); }

} /*<applet code="star.class"width=500 height=500></applet>*/

Program 14

Program: WAP in java to implement the use of I/O Streams.

import java.io.*;

class First {

public static InputStreamReader input=new InputStreamReader(System.in); public static BufferedReader keyboardInput=new BufferedReader(input); static PrintWriter screenOutput=new PrintWriter(System.out,true);

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

String name; screenOutput.print("What is your name?"); screenOutput.flush();

name=keyboardInput.readLine(); screenOutput.print("\nHello"+name);

screenOutput.println("java is based on independent platform"); } }

Program 15

Program: WAP in java to implement swing program.

import javax.swing.*; class program extends JFrame

{ program()

{ setTitle("first form"); setSize(300,300);

setVisible(true); }

} class form {

public static void main (String args[ ]) {

program p=new program(); } }