Main.java

import java.lang.System;

public class Main {
	
	public static void main(String[] args) {
		Foo element1 = new Foo("1Foo");
		Foo element2 = new Foo("2Foo");
		Foo element3 = new Foo("3Foo");
		Foo element4 = new Foo("4Foo");
		Foo element5 = new Foo("5Foo");
		
		Foo[] data = new Foo[] {
			element1, element2, element3, element4, element5
		};
		
		for (int i = 0; i < data.length; i++)
			System.out.println(data[i].getID());
		
		for (int i = 0; i < data.length; i++)
			data[i] = new Bar(data[i]);
		
		for (int i = 0; i < data.length; i++)
			System.out.println(data[i].getID());
		
		System.out.println(element1.getID());
	
	}
	
	public static class Foo {
	
		private String ident;
		
		public Foo(String id) {
			this.ident = id;
		}
		
		public String getID() {
			return this.ident;
		}
	
	}
	
	public static class Bar extends Foo {
	
		public Bar(String id) {
			super(id);
		}
		
		public Bar(Foo foo) {
			super(foo.getID());
		}
		
		@Override
		public String getID() {
			return super.getID() + "Bar";
		}
		
	}

}