java 泛型方法定义规则

Following are the rules to define Generic Methods

• All generic method declarations have a type parameter section delimited by angle brackets (< and >) that precedes the method’s return type ( < E > in the next example).

• Each type parameter section contains one or more type parameters separated by commas. A type parameter, also known as a type variable, is an identifier that specifies a generic type name.

• The type parameters can be used to declare the return type and act as placeholders for the types of the arguments passed to the generic method, which are known as actual type arguments.

• A generic method’s body is declared like that of any other method. Note that type parameters can represent only reference types, not primitive types (like int, double and char).