Anonymous Java Developer interview questions

What will be the output of the following program ? class Parent { public void display () { System.out.println ("Parent"); } } class Child extends Parent { public void display () { System.out.println ("Child"); } } class Main { public static void doDisplay (Parent p) { p.display (); } public static void main (String[]args) { Parent a = new Parent (); Parent b = new Child (); Child c = new Child (); doDisplay (a); doDisplay (b); doDisplay (c); } }