Java Programs Lab File

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
{
{
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);
}
}
{
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
{
{
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");
}
{
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
{
{
A ob=new A();
B ob1=new B();
ob.start();
ob1.start();
}
}

Program 11
Program: WAP in java to implement Exception Handling.
class Error
{
{
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
{
{
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();
}
}

Java Programs Lab File

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Java Programs Lab File