java hashmap键迭代

java hashmap key iteration(java hashmap键迭代)

问题描述

有没有办法遍历 java Hashmap 并打印出作为 Hashmap 一部分的每个键的所有值?

Is there any way to iterate through a java Hashmap and print out all the values for every key that is a part of the Hashmap?

推荐答案

With for-each 循环，使用 Map.keySet() 用于迭代键，Map.values() 用于迭代值和 Map.entrySet() 用于迭代键/值对.

With for-each loop, use Map.keySet() for iterating keys, Map.values() for iterating values and Map.entrySet() for iterating key/value pairs.

请注意，所有这些都是用于获取它们的地图的直接视图，因此您对三者中的任何一个或地图本身所做的任何修改都会反映到所有其他人.

Note that all these are direct views to the map that was used to acquire them so any modification you make to any of the three or the map itself will reflect to all the others too.

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