How do i extract the length of integer array from Map?

Question

How do i extract the length of integer array from a `Map?

Map <Integer, ArrayList<Integer>> res = function() ;

for (Map.Entry entry : res.entrySet()) {
  System.out.println(entry.getValue());        
}

Doing System.out.println(entry.getValue().size()); does not work.

score 5 · Accepted Answer · edited May 23 '17 at 12:06

5

You need to specify type arguments for your Entry.

for(Map.Entry<Integer, ArrayList<Integer>> entry : res.entrySet()){

Otherwise, the type usage is raw.

See

edited May 23 '17 at 12:06

Community

answered Mar 16 '14 at 15:45

100% thx, i felt like there was something obvious, but i did not know about this stuff - still lots of java to learn.! – ERJAN Mar 16 '14 at 15:58

score 1 · Answer 2 · answered Mar 16 '14 at 15:51

1

You are missing generic thing when you are retrieving the MAP try below line

  for(Map.Entry<Integer, ArrayList<Integer>> entry : res.entrySet())

answered Mar 16 '14 at 15:51

Rookie007

2 Answers2