class Main { public static void main(String[] args) { System.out.println(null instanceof Object); System.out.println(null instanceof Exception); System.out.println(null instanceof NullPointerException); test(null); } static void test(Object o) { System.out.println("in Object"); } static void test(Exception e) { System.out.println("in Exception"); } static void test(NullPointerException e) { System.out.println("in NullPointerException"); } }