INTERFACES

Exno:                                                   INTERFACES

Aim:

            To write a java program to implement the concept of  interfaces.

Algorithm:

Step1: Start.

Step2: Create a interface calculate and declare he method area().

Step3: Create the class rectangle and triangle which implements the interface calculate.

Step4: within these classes define the method area().

Step5: Create the objects for the rectangle and triangle and find the area.

Step6: Print the area of rectangle and triangle.

Step7: Stop.

Program:

import java.io.*;

interface calculat

{

public double area(double len,double hgt);

}

class rectangle implements calculat

{

public double area(double len,double hgt)

{

return len*hgt;

}

}

class triangle implements calculat

{

public double area(double len,double hgt)

{

return 0.5*len*hgt;

}

}

public class calculate

{

public static void main(String args[])

{

rectangle r=new rectangle();

triangle t=new triangle();

System.out.println(r.area(40,50));

System.out.println(t.area(20,30));

}

}

Output:

Z:\anitha>javac calculate.java

Z:\anitha>java calculate

2000.0

300.0