comefrom: <awangdev>217. Contains Duplicate_2.java
code: public boolean containsDuplicate(int[] nums) {
          if (nums == null || nums.length == 0) {
              return false;
          }
          Arrays.sort(nums);
          for (int i = 0; i < nums.length - 1; i++) {
              if (nums[i] == nums[i + 1]) {
                  return true;
              }
          }
          return false;
      }
masked: public boolean var_0 ( int [ ] var_1 ) {
    if ( var_1 == null || var_1 . length == 0 ) {
      return false ;
    }
    Arrays . sort ( var_1 ) ;
    for ( int var_7 = 0 ;
    var_7 < var_1 . length - 1 ;
    var_7 ++ ) {
      if ( var_1 [ var_7 ] == var_1 [ var_7 + 1 ] ) {
        return true ;
      }
    }
    return false ;
  }
  