Category:工作知识类
Article From:https://www.cnblogs.com/lu51211314/p/9121536.html

 

 

Among them, item in red box refers to one of the collections. When a new collection is formed, exclude a certain item. It means that the new set contains only the conditions (item.equals).“2”))One item.

The above is my own understanding. If there is a better description, please leave a message.

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