<awangdev>[lint]. Unique Characters_2.java
public boolean isUnique(String str) {
    	if (str == null || str.length() == 0) {
    		return true;
    	}
    	HashSet<Character> set = new HashSet<Character>();
    	for (int i = 0; i < str.length(); i++) {
    		if (!set.contains(str.charAt(i))) {
    			set.add(str.charAt(i));
    		} else {
    			return false;
    		}
    	}

    	return true;
    }
public boolean var_0 ( String var_2 ) {
  if ( var_2 == null || var_2 . length ( ) == 0 ) {
    return true ;
  }
  HashSet < Character > var_8 = new HashSet < Character > ( ) ;
  for ( int var_9 = 0 ;
  var_9 < var_2 . length ( ) ;
  var_9 ++ ) {
    if ( ! var_8 . contains ( var_2 . charAt ( var_9 ) ) ) {
      var_8 . add ( var_2 . charAt ( var_9 ) ) ;
    }
    else {
      return false ;
    }
  }
  return true ;
}
