Is there a map or list in java that allows associating two objects with eachother?

Question

I would need a list/map like a HashMap where i can easily access either 'side' by simple passing the object and retrieving the other thing.

I need to be able to use get(key) and retrieve the value as well as get(value) and retrieve the key AND i want to be able to set a new key or value.

Is there already something like that ?

Use two HashMaps, one for each direction. – Klitos Kyriacou Nov 06 '15 at 12:53 — Klitos Kyriacou, Nov 06 '15 at 12:53

score 1 · Accepted Answer · answered Nov 06 '15 at 12:56

1

Two popular choices are

answered Nov 06 '15 at 12:56

Xipo

score 0 · Answer 2 · answered Nov 06 '15 at 12:51

0

There's no built-in data type for this. You can use Guava's BiMap and do this with reverse() function. See this.

answered Nov 06 '15 at 12:51

Sezin Karli

2 Answers2