是否在Java中继承了静态方法？ [英] Are static methods inherited in Java?

问题描述

我正在阅读Khalid Mughal撰写的程序员指南
Java™SCJP认证。

I was reading A Programmer’s Guide to Java™ SCJP Certification by Khalid Mughal.

在继承章节中，它解释

成员的继承与其声明的
可访问性密切相关。如果超类成员可以通过其子类中的简单名称
访问（不使用任何额外的语法，如super），那么
成员将被视为继承

Inheritance of members is closely tied to their declared accessibility. If a superclass member is accessible by its simple name in the subclass (without the use of any extra syntax like super), that member is considered inherited

它还提到静态方法不会被继承。但是下面的代码完全没问题：

It also mentions that static methods are not inherited. But the code below is perfectlly fine:

class A
{
    public static void display()
    {
        System.out.println("Inside static method of superclass");
    }
}

class B extends A
{
    public void show()
    {
        // This works - accessing display() by its simple name -
        // meaning it is inherited according to the book.
        display();
    }
}

我如何直接使用在课堂 B 中显示（）？更多， B.display（）也有效。

How am I able to directly use display() in class B? Even more, B.display() also works.

本书的解释是否仅适用于实例方法？

Does the book's explanation only apply to instance methods?

推荐答案

所有可访问的方法都由子类继承。

All methods that are accessible are inherited by subclasses.

来自Sun Java 教程：

From the Sun Java Tutorials:

子类继承其父级的所有公共成员和受保护成员，无论子类是什么包如果子类与其父类在同一个包中，它还会继承父类的包私有成员。您可以按原样使用继承的成员，替换它们，隐藏它们或用新成员补充它们

A subclass inherits all of the public and protected members of its parent, no matter what package the subclass is in. If the subclass is in the same package as its parent, it also inherits the package-private members of the parent. You can use the inherited members as is, replace them, hide them, or supplement them with new members

继承静态的唯一区别（类）方法和继承的非静态（实例）方法是当你用相同的签名编写一个新的静态方法时，旧的静态方法只是隐藏，而不是被覆盖。

The only difference with inherited static (class) methods and inherited non-static (instance) methods is that when you write a new static method with the same signature, the old static method is just hidden, not overridden.

从页面了解覆盖和隐藏之间的区别。

From the page on the difference between overriding and hiding.

隐藏和覆盖之间的区别具有重要意义。被调用的重写方法的版本是子类中的版本。被调用的隐藏方法的版本取决于它是从超类还是从子类调用

The distinction between hiding and overriding has important implications. The version of the overridden method that gets invoked is the one in the subclass. The version of the hidden method that gets invoked depends on whether it is invoked from the superclass or the subclass

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