comefrom: <awangdev>[lint]. Unique Characters_1.java
code: public boolean isUnique(String str) {
      	if (str == null || str.length() == 0) return true;
  
      	char[] arr = str.toCharArray(); 
  		Arrays.sort(arr);
      	for (int i = 1; i < arr.length; i++) {
  			if (arr[i] == arr[i - 1]) return false;
      	}
      	return true;
      }
masked: public boolean var_0 ( String var_1 ) {
    if ( var_1 == null || var_1 . length ( ) == 0 ) return true ;
    char [ ] var_2 = var_1 . toCharArray ( ) ;
    Arrays . sort ( var_2 ) ;
    for ( int var_3 = 1 ;
    var_3 < var_2 . length ;
    var_3 ++ ) {
      if ( var_2 [ var_3 ] == var_2 [ var_3 - 1 ] ) return false ;
    }
    return true ;
  }
  