package subclass.overload;

class A {
	public void m(String s) { System.out.println("A"); }
}
class B extends A {
	public void m(Object o) { System.out.println("B"); }
}

class Main {
	private Main() {}
	public static void main(String[] args) {
		String y = "?";
		Object x = y;
		B b = new B();
		A a = b;
		a.m(y);
		// a.m(x);
		b.m(y);
		b.m(x);
	}
}