java what does it mean?

##In JAVA, means generic, which means that another class needs to be used in the Tree class, but the specific type of the class to be used cannot be determined. , so use T instead for the time being. When the specific program knows what type to use, use that type to replace T, and it will be ok. For example, I need to instantiate a Tree class, and the class I need to use is String, then I can instantiate Tree() like this.

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