wildcard

import java.util.*;
class A{
	private int x;
	private int y;
	public A(int x,int y){
		this.x=x;
		this.y=y;
	}
	public int getX(){
		return this.x;
	}
	public int getY(){
		return this.y;
	}
}
class B extends A{
		private int z;
		public B(int x,int y,int z)
		{
			super(x,y);
			this.z=z;
		}
	public int getZ()
	{
		return this.z;
	}
}
class Sample<T>
{
	private T[] values;
	public Sample(T[] values)
	{
		this.values=values;
	}
	public static <T> void show(Sample<? extends A> other)
	{
		for(int i=0;i<other.values.length;i++)
		{
			System.out.println(other.values[i].getX()+" "+other.values[i].getY()+" ");
		}
	}
	public static <T> void show2(Sample<? extends B> other)
	{
		for(int i=0;i<other.values.length;i++)
		{
			System.out.println(other.values[i].getX()+" "+other.values[i].getY()+" "+other.values[i].getZ());
		}
	}
}
public class WildCard
{
	public static void main(String[] args)
	{
		A[] ar={ new A(1,2),new A(2,3),new A(3,4)};
		Sample<A> a1=new Sample<A>(ar);
		a1.show(a1);
		
		B[] br={ new B(1,2,5),new B(2,3,7),new B(3,4,8)};
		Sample<B> b1=new Sample<B>(br);
		b1.show2(b1);
	}
}