Program Polimorfism Java

Program Polimorfism Java

public class Polimorfisme {
    public static void main(String[] args) {
       
        Shape s1 = new Rectangle("Red", 10, 4);

        ((Rectangle)s1).showRectangle();
               
        Rectangle s3 = new Rectangle("Black", 3, 3);
   
        Shape s2 = s3;
        Shape s4 = (Rectangle) s3;
   
       
        Rectangle s5 = new Rectangle("Yellow",2,2);
        Shape s8 = s5;
        Rectangle s9 = (Rectangle) s8;
       
    }
}




public class Shape {
   
    private String color;


    public Shape (String color) {
        this.color = color;
    }

    public void showShape() {
        System.out.println("ERROR ! Dilarang memanggil method ini");
    }
}




public class Rectangle extends Shape {

   private int length=0;
   private int width=0;
  
   public Rectangle(String color, int length, int width) {
      super(color);
      this.length = length;
      this.width = width;
   }
  
   public void showRectangle() {
      System.out.println("Luas Persegi Panjang = "+(length*width));
   }
}