Interface practice 4

 MAIN.JAVA:

import java.util.*;
import java.text.*;
public class Main {
public static void main(String[] args){

     Scanner sc=new Scanner(System.in);
     DecimalFormat df=new DecimalFormat("0.00");
     System.out.println("Enter the shape\n1.Rectangle\n2.Triangle");
     int input=sc.nextInt();
     double value1,value2;
     switch (input)
     {
          case 1:
          System.out.println("Enter the length and breadth:");     
          Shape.Rectangle rectangle=new Shape.Rectangle();
          rectangle.setValue1(sc.nextDouble());
          rectangle.setValue2(sc.nextDouble());
          System.out.println("Area of rectangle is "+df.format(rectangle.computeRectangleArea()));
          break;
          
          case 2:
          System.out.println("Enter the base and height:");
          Shape.Triangle triangle=new Shape.Triangle();
          triangle.setValue1(sc.nextDouble());
          triangle.setValue2(sc.nextDouble()); 
          System.out.println("Area of triangle is "+df.format(triangle.computeTriangleArea()));
          break;
          
          default:
          System.out.println("Invalid choice");
     
     
     }
   }
}   

SHAPE.JAVA:

public class Shape {
	public static double value1;
	public static double value2;

        //fill your code here

	public static class Rectangle{
        public void setValue1(double nextDouble){
            value1=nextDouble;
        }

        public static double getValue1(){
            return value1;
        }

        public void setValue2(double nextDouble){
            value2=nextDouble;
        }

        public static double getValue2(){
            return value2;
        }

        public double computeRectangleArea(){
            double ar = getValue1()*getValue2();
            return ar;
        }
    }
    public static class Triangle{
        public void setValue1(double nextDouble){
            value1=nextDouble;
        }

        public static double getValue1(){
            return value1;
        }

        public void setValue2(double nextDouble){
            value2=nextDouble;
        }

        public static double getValue2(){
            return value2;
        }

        public double computeTriangleArea(){
            double ar = 0.5*(getValue1()*getValue2());
            return ar;
        }
    }
}