How to get the collection to be handed in, and to make up

前段时间写  removeall . retainall addall 这些api 感觉不是很实用 还是流靠谱点
https://blog.csdn.net/weixin_38256991/article/details/81672235

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Origin blog.csdn.net/weixin_43689953/article/details/111305481