Delete entry from HashMap

2018-06-05 17:00:28

This question already has an answer here:

Iterate through a HashMap [duplicate] 7 answers

迭代你的地图

Iterator it = adjMap.entrySet().iterator();
    while (it.hasNext())
    {
       Entry item = it.next();
       map.remove(item.getKey());
    }

I think for-each loops are not allowed to alter the iterated object. To remove entries you should use an iterator.

Compare to map-Iteration for an example.

您可以改为使用ConcurrentHashMap ，或者创建HashMap的副本并对副本进行任何更改。

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