public class Foo extends Blue {
            // method1 - blue 1
            public void method2() {
                System.out.println("foo 2");
            }
            public String toString() {
                return "foo";
            }
        }
============
        public class Blue extends Moo {
            // method2 - "moo 2"
            // toString - "moo"
            public void method1() {
                System.out.println("blue 1");
            }
        }
============
        public class Shoe extends Foo {
            // method2 - "foo 2"
            // toString - "foo"
            public void method1() {
                System.out.println("shoe 1");
            }
        }
============        
        public class Moo { // base class
            public void method1() {
                System.out.println("moo 1");
            }        
            public void method2() {
                System.out.println("moo 2");
            }        
            public String toString() {
                return "moo";
            }
        }
===============
        Moo[] elements = {new Shoe(), new Foo(), new Moo(), new Blue()};
        for (int i = 0; i < elements.length; i++) {
                                              Shoe     Foo     Moo    Blue
            System.out.println(elements[i]);  foo      foo     moo    moo
            elements[i].method1();            shoe 1   blue 1  moo 1  blue 1
            elements[i].method2();            foo 2    foo 2   moo 2  moo 2
            System.out.println();
        }