java基本類型值與包裝類對象null的比較會導致空指針

  try {
            System.out.println(0 == (Integer)null);
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            System.out.println(0 == (Long)null);
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            System.out.println(0 == (Double)null);
        } catch (Exception e) {
            e.printStackTrace();
        }