hierar.java

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/*
 *
 * @author g1.test1
 **/
class figure1
{
 int l, b;
 figure1(int x,int y)
 {
 l=x;
 b=y;
 System.out.println("inside super"+l+b);
 }
}
 class rect1 extends figure1
{
 
 rect1(int x,int y)
 {
 super(x,y);//don't need to give instance var coz super makes variables x &y
 
 }
 int disp()
 {
 System.out.println("inside rect");
 return (l*b);

 }
}
 class trin1 extends figure1
 {
 int c;
 
 trin1(int x,int y,int z)
 {
 super(x,y);
 c=z;
 System.out.println("inside tri construct");
 }
 int disp()
 {
 System.out.println("inside tri");
 return (l*(b/2));
 }
 
 }
public class hierar {

 public static void main(String args[])
 {
 tri obj=new tri(4,5,6);
 System.out.println(obj.disp());
 rect obj2=new rect(3,4);
 System.out.println(obj2.disp());
 }

}