Detailed explanation of TypeVariable in Java source code parsing

TypeVariable, a type variable, describes a type, which means that it generally refers to any or related type. It can also be said that in a narrow sense, it generally uses capital letters as variables, such as K, V, e, etc.

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When it comes to TypeVariable < d >, I have to mention another important interface object in Java generics, genericdeclaration interface object. This interface is used to define which objects can declare (define) generic variables. The so-called generic variables are < e extensions list > or < E >, that is, the corresponding objects of the TypeVariable < d > interface. D in TypeVariable < d > is the extension genericdeclaration, which is used to obtain the genericdeclaration with this variable in reverse through the generic variable.

At present, the classes that implement the genericdeclaration interface include class, method and constructor, that is, the declaration (definition) of generic variables can only be carried out on these objects. The interface method gettypeparameters of genericdeclaration is used to obtain the declaration of generic variables of the genericdeclaration one by one. For details, please see the detailed explanation of genericdeclaration in Java source code analysis

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