Determine output of main method also draw reference values and objects

public class A public void foo (Object o f System.out. printin"A"): public class B public void foo (String o) System.out.println("B") public class C extends A public void foo (String s) &System.out.println("C"); public class D extends B public void foo (Object o) System.out.println("D"); ) public class PolymorDemo public static void main(String[ ] args) A a new CO; a.foo("Java"); C c new CO; c.foo("Java"); B b new D): b.foo("Java"); D d new D; d.foo("Java")