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javacollections
Syrius013
Syrius013

Reputation: 45

Java-Collection search

I have a variable length Collection full of one letter strings (it can be any type of collection). I am trying to create a result based on what the collection contains. If all of the letters in the collection are "P" then the result is "P", if all of the letters are "N" then the result is "N", if there is a mix of the two then the result is "NC". Is there anyway to do this without creating a complicated mess of loops? Thank you for your help.

Upvotes: 0

Views: 332

Answers (2)

PbxMan
PbxMan

Reputation: 7625

Yes you could use:

Collections.frequency(f, "N");

Just like this:

String n = "N";      
Collection f = new ArrayList();
f.add(n);
f.add(n);
f.add(n);
f.add(n);
System.out.println(Collections.frequency(f, n));

Upvotes: 5

BostonJohn
BostonJohn

Reputation: 2661

you could convert the collection to a set, then each element will only occur once, and you can just loop through the set to collect an single instance of each entry (ie, ever element that was in the collection will occur exactly once within the set).

I believe

Set newSet = new HashSet(existingCollection)

will work for that

Upvotes: 0

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