Integer a0 = 127;
      Integer a1 = 127;
      Integer b0 = 128;
      Integer b1 = 128;
      int c = 128;
      
      
      System.out.println(a0 == a1);  >>>> true //Integer 对象-128 ~ 127 会缓存，不会新建对象 所以相等
      
      System.out.println(b0 == b1);  >>>> false //对象-128 ~ 127 会缓存  但是之外的数据会重新new 
      
      System.out.println(b0 == c);   >>>> true //这里Integer 会自动拆箱成int类型