java.util.Map 的交集 [英] Intersection of java.util.Map

问题描述

java.util.Map 或任何实用程序中是否有一种方法可以在两个地图上执行交集?(通过键"将两个地图相交)

Is there a method in java.util.Map or any util to perform an intersection on two maps? (To intersect two maps by the "keys")

我找不到任何.我总是可以实现我自己的交集逻辑，但我希望在其中一个 java.util.* 类中已经有一些操作可以做到这一点.

I am not able to find any. I can always implement my own intersection logic, but I was hoping there is already some operation in one of the java.util.* classes that would do this.

推荐答案

怎么样:

Map map1 = ...;
Map map2 = ...;
Map result = new ...(map1);
result.keySet().retainAll(map2.keySet());

或:

Map map1 = ...;
Map map2 = ...;
Set result = new ...(map1.keySet());
result.retainAll(map2.keySet());

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