How to give Integer values in HashMap?

Question

In hashmap how to give Integers in below form repersentation.i tried but i can't get solution.

(1,2)=17;

What type is (1,2)?? And please post what you have tried here — kkaosninja, Oct 06 '15 at 18:59
@kkaosninja: In directed acyclic graph edge cost to be mention in form of 1,2 = 17, 1,3 =4 like that to give — user306128, Oct 06 '15 at 19:03
@user306128 Please add additional information and clarification directly to your question by editing it, rather than leaving comments on it. — azurefrog, Oct 06 '15 at 19:10

score 0 · Answer 1 · edited May 23 '17 at 11:44

0

This is a multi-key hashmap. The basic idea is to create two hashmaps and chain them together. See this question for a duplicate answer.

edited May 23 '17 at 11:44

Community

answered Oct 06 '15 at 19:02

wyas

How do you know the OP wants two keys to map to 17 as opposed to a [tuple](https://en.wikipedia.org/wiki/Tuple) containing `1,2`? – azurefrog Oct 06 '15 at 19:03
I didn't really think about the tuple, good point. But then it can just be treated as an atomic, immutable key, and go about it the usual way. – wyas Oct 06 '15 at 19:09

score 0 · Answer 2 · edited May 23 '17 at 10:26

0

Step 1: Create a custom Tuple class. Use the code from accepted answer to this question => Using Pairs or 2-tuples in Java.

Thanks to @azurefrog for the tip.

Step 2: The type of the HashMap holding this would be

HashMap<Tuple, Integer> myMap = new HashMap<Tuple, Integer>();

Hope this helps :-)

edited May 23 '17 at 10:26

Community

answered Oct 06 '15 at 19:09

kkaosninja

2 Answers2