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What makes something more efficient? Does it always give the correct answer?

What language is that? The :: doesn't look like java.

Sorry, I have no idea what that code is doing. Too many definitions are missing.

What language is that? Java does not have :: syntax

If you are having problems with your code, post the code and your questions.

Have you looked at the API doc for the Map interface? It has several methods that can be used to get the contents of the Map. What have you tried?