HashMap<int[],string> mapping integer array by considering their values

Question

Given the following code, I get a null (what I want is "1234"). But I wish to have a map that could consider the key as equals, if the contents of int[] are equals (rather than consider that the references of int[]), how should I do it?

HashMap<int[], String> maps=new HashMap<int[], String>();
int[] i=new int[]{1,2,3};
int[] j=new int[]{1,2,3};
maps.put(i,"1234");
System.out.print(maps.get(j));

I am opened to any map that allows keeping int[] as the key (including TreeMap) and so on, with the side condition that if that does not hamper on the effectiveness of the map accessing time.

Answer 1

No way to do that with arrays, because they don't override equals() and hashCode(). You should define your own class wrapping the array, which would override equals() and hashCode() or use a List<Integer> as key instead.