comefrom: <awangdev>246. Strobogrammatic Number_1.java
code: private HashMap<Character, Character> buildMap() {
  
          HashMap<Character, Character> map = new HashMap<>();
          map.put('0','0');
          map.put('1','1');
          map.put('8','8');
          map.put('6','9');
          map.put('9','6');
          return map;
      }
masked: private HashMap < Character , Character > var_0 ( ) {
    HashMap < Character , Character > var_1 = new HashMap < > ( ) ;
    var_1 . put ( '0' , '0' ) ;
    var_1 . put ( '1' , '1' ) ;
    var_1 . put ( '8' , '8' ) ;
    var_1 . put ( '6' , '9' ) ;
    var_1 . put ( '9' , '6' ) ;
    return var_1 ;
  }
  