从哈希图中删除给定值的所有项目

问题描述

所以我有一个如下的 java hashmap:

So I have a java hashmap like below:

hMap.put("1", "One");
hMap.put("2", "Two");
hMap.put("3", "Two");

我想删除值为二"的所有项目

I would like to remove ALL items where the value is "Two"

如果我这样做:

hmap.values().remove("Two");

只删除了第一个，我想全部删除，怎么办?

Only the first one is deleted, I want to remove them all, how can this be done?

推荐答案

hmap.values().removeAll(Collections.singleton("Two"));

这种简洁方法的(显着)缺点是你基本上被迫评论它，说类似

the (significant) disadvantage with this concise approach is that you are basically forced to comment it, saying something like

//remove("Two") 只会删除第一个

否则，某天某个好心的工程师会尝试为您简化它并破坏它.发生这种情况...有时善意的行善者甚至是未来的你！

otherwise, some well-meaning engineer will try to simplify it for you someday and break it. This happens... sometimes the well-intentioned do-gooder is even Future You!

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