Get size/length of a value in a HashMap

Question

Map<Integer, String> map = new HashMap<Integer, String>();

How do I get the size/length of matching value's at the String?

example:

1 , Red 2 , Red 3 , Blue 4 , Blue 5 , Red

Size of the String of RED = 3

Solution

Use .values() to get a collection containing all the values of the hash map, and then use Collections.frequency() to count the number of objects in the collection.

return Collections.frequency(map.values(), "red");

Comments

[Jon Skeet]

What do you mean by "second" here? HashMaps are unordered.

[user1621988]

@ JonSkeet Edited, made a little mistake.

[Roddy of the Frozen Peas]

So you're looking for the frequency of a particular value in the map?

[user1621988]

Im looking for that amount of RED's in the String Values. and this place 3 times.

[Denys Séguret]

So both answers that aren't mine look correct

[Denys Séguret]

I didn't knew this one... I wonder why they decided to put all those methods which have so little use... Java standard API are less and less simple and canonical...