Storing arrays in Set and avoiding duplicates

Question

HashSet boog = new HashSet();
boog.add(new String[]{\"a\", \"b\", \"c\"});
boog.add(new String[]{\"a\", \"b\", \"c\"});
boog.add(new          


        

Answer 1

You can't. arrays use the default identity-based Object.hashCode() implementation and there's no way you can override that. Don't use Arrays as keys in a HashMap / HashSet!

Use a Set of Lists instead.