在类上调用静态方法？ [英] Calling static method on a class?

问题描述

说，我引用了一个Class对象，SomeType有一个静态方法。有没有办法调用该方法w / o实例化SomeType第一？

Say, I have a reference to a Class object with SomeType having a static method. Is there a way to call that method w/o instantiating SomeType first? Preferably not escaping strong typing.

编辑：好的，我搞砸了。

OK, I've screwed up.

interface Int{
    void someMethod();
}

class ImplOne implements Int{
    public void someMethod() {
        // do something
    }
}

Class<? extends Int> getInt(){
    return ImplOne.class;
}

在这种情况下，someMethod >

In this case someMethod() can't be static anyways.

推荐答案

根据定义，一个静态方法在一个类上调用，而不是在该类的实例上调用。

A static method, by definition, is called on a class and not on an instance of that class.

所以如果你使用：

SomeClass.someStaticMethod()

无需实例化（放弃类加载和实例化 SomeClass 类

you are instantiating nothing (leave aside the class loading and instantiation of the SomeClass class itself, which the JVM handles and is way out of your scope).

这与在一个对象上调用的常规方法相反，它已经被实例化了：

This is opposed to a regular method called on an object, which has already been instantiated:

SomeObject o = someObject; // had to be instantiated *somewhere*
o.someMethod();

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