Java: Composite key in hashmaps

Question

I would like to store a group of objects in a hashmap , where the key shall be a composite of two string values. is there a way to achieve this?

i can simply concate

Answer 1

I have a similar case. All I do is concatenate the two strings separated by a tilde ( ~ ).

So when the client calls the service function to get the object from the map, it looks like this:

MyObject getMyObject(String key1, String key2) {
    String cacheKey = key1 + "~" + key2;
    return map.get(cachekey);
}

It is simple, but it works.