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upangka/20191106-Map操作.md

Last active November 6, 2019 02:24
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20191106-Map操作.md 
// 删除entry,根据key 满足什么条件
map.entrySet().removeIf(e->e.getKey boolean condition);
// 删除entry,根据value 是否为null
map.values().removeIf(Objects::isNull);
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