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.
Some important methods:
| Return Type | Method | Description |
|---|---|---|
| K | getKey() | Returns the key corresponding to this entry. |
| V | getValue() | Returns the value corresponding to this entry. |