class A { int x; int y; A () { } void f () { System.out.print ("Je suis A\n"); } void g (int x) { } } class B extends A { int x; int z; B () { } void f () { System.out.print ("Je suis B\n"); } void g (int x, boolean b) { } int h (int x) { return 42;} } public class exemple { public static void main (String s []) { A a1 = new A(); A a2 = new B(); a2.f(); a1.f(); } }