3.b. Implementation of multiple inheritance using interfaces to calculate the area of a rectangle and triangle

/*Simple Program on Java for the implementation of multiple inheritance using interfaces to calculate the area of a rectangle and triangle.*/


// InterfaceMain.java

import java.io.*;
interface area
  {
    float compute(float x, float y);
  }

class rectangle
  {
    public float compute(float x, float y)
      {
        return (x*y);
      }
  }

class triangle
  {
    public float compute(float x, float y)
      {
        return (x*y/2);
      }
  }

class result extends rectangle implements area
  {
    public float compute(float x, float y)
      {
        return (x*y);
      }
  }

class result1 extends triangle implements area
  {
    public float compute(float x, float y)
      {
        return (x*y/2);
      }
  }

class InterfaceMain
  {
    public static void main(String args[])
      {
        result rect = new result();
        result1 tri = new result1();
        area a;
        a = rect;
        System.out.println("\nArea of rectangle = " + a.compute(10,20));
        a = tri;
        System.out.println("\nArea of triangle  = " +a.compute(10,2));
      }
  }