Java | Get column keys from a row key

Question

I have Table like Table<String, String, String> distributions = HashBasedTable.create();

|----------------------------------------------|
| Row             | Column   | Value           |
|----------------------------------------------|
| aaa             | a        | Hard Rock       |
| aaa             | n        | Art Pop         |
| abc             | b        | Surrealist Film |
| abc             | c        | Blockbuster     |
|----------------------------------------------|

My Column values are all unique but my Row values can be repeated.

so How can I get all the Column keys given a Row key?

score 0 · Answer 1 · answered Jul 09 '17 at 18:03

0

If you want values based on rows. it will give you multiple values

answered Jul 09 '17 at 18:03

Naman Bansal

49
6

Yes I know. and your answer should be a comment – Sapnesh Naik Jul 09 '17 at 18:11

mfulton26 · Accepted Answer · 2017-07-12T16:20:22.617

0

You can use Table.rowMap() to get "a view that associates each row key with the corresponding map from column keys to values"; the view is a Map and its keySet() contains all of the Column keys for a given Row key:

 distributions.rowMap().get("aaa").keySet(); // [a, n]
 distributions.rowMap().get("abc").keySet(); // [b, c]

edited Jul 12 '17 at 16:20

answered Jul 11 '17 at 14:56

mfulton26

29,956
6
64
88

Java | Get column keys from a row key

2 Answers2