JAVA PROGRAMS-Interface Demo program in java

Interface Demo program in java

Program Name:- inter1

import java.io.*;

interface demo

{

final double pi=3.14;

abstract double area(int r);

}

interface demo1

{

abstract double circum(int r);

}

class cir implements demo,demo1

{

public double area(int r)

{

return pi*r*r;

}

public double circum(int a)

{

return 2*pi*a*a;

}

}

class inter1

{

public static void main(String arg[])

{

cir c=new cir();

System.out.print("\nCircle\t:"+c.area(5));

System.out.print("\nCircum\t:"+c.circum(5));

}

}