泛型方法：静态与非静态

Question

Directly from this java tutorial:

For static generic methods, the type parameter section must appear before the method's return type.

Is it not true for NON-static generic method? If not what's the NON-static generic method syntax? Thanks in advance.

Answer 1

The syntax for declaring non-static generic methods is the same as for static methods, just without the static keyword: generic type parameters are placed before the return type.

class Example {
     public <E> void method(E param) { }
}

Non-static methods may also use the generic type parameter of the enclosing class, like below. These are not considered generic methods; a generic method is one that declares type parameters .

class Example<T> {
     // Not a generic method!
     public void method(T param) { }
}

Answer 2

This is true for any generic methods.

public <T> T f() {
    return this.<T> f();
}

Answer 3

该语句适用于所有泛型方法，因为这是泛型方法的定义 - 泛型方法是声明类型参数的方法。