関連ワード:  java sort arraylist of objects    java sort arraylist of objects by field    java sort arraylist of objects by multiple fields    java sort arraylist of objects by string field    java sort arraylist of objects by int field    java sort arraylist of objects by field descending    java sort arraylist of objects by field alphabetically    java sort arraylist of objects without comparator    java sort arraylist of objects by date field    java sort arraylist of class objects