I tried to compare two ints with the following cases and got unexpected results

1. when I did the following, @@@ was printed.

    class C {
      static Integer a = 127;
      static Integer b = 127;
      public static void main(String args[]){
      if(a==b){
         System.out.println("@@@"); 
      }
      }
    }
   

2. when I did the following, @@@ was not printed.

    class C {
      static Integer a = 145;
      static Integer b = 145;
      public static void main(String args[]){
      if(a==b){
         System.out.println("@@@"); 
      }
      }
    }
   

Can anyone tell me what could be the reason.