Java

I met Map.Entry for many times when I was fighting with Leetcode. However, I did not understand it and it always confused me. I studied it today and write down to record it for myself. (:Click here for java documention:) Map.Entry is a internal interface of Map. It provides more convenient method for outputing key-value pair. How do we output key-value pair of a Map generally? First, get all keys as a set Second, iterate to get every value according to keyset. If we have Map.Entry, we will get key and value at meantime. ...