What does java t mean?

In JAVA, means generic.

It 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 T is used instead for the time being.

When the specific program knows what type to use, use that type instead of T. For example, if you need to instantiate a Tree class and the class that needs to be used is String, then you can do this to instantiate Tree().

Definition classification

There are mainly two types of definitions of generics:

1. In program coding Some types contain type parameters, which means that generic parameters can only represent classes, not individual objects. (This is a more common definition today)

2. Some classes that contain parameters in program coding. Its parameters can represent classes or objects, etc. (People mostly refer to this as templates.) Regardless of which definition is used, the parameters of the generic must be specified when the generic is actually used.

Some strongly typed programming languages ​​support generics, the main purpose of which is to enhance type safety and reduce the number of class conversions. However, some programming languages ​​that support generics can only achieve part of the purpose.

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