哪个类在基类的构造函数中getClass（）报告 [英] Which class does getClass() report inside a constructor of a base class

问题描述

在Java中，可以放心地假设在用作基类的类的构造函数中调用 getClass（）将提供有关派生类的信息，而不是基类的类？

In Java, is it safe to assume that getClass() called inside a constructor of a class used as a base class will provide information about the derived class, rather than the class of the base class?

它似乎工作，但我想这不一定意味着它的安全。
例如，如果我有以下两个类：

It seems to work, but I guess that doesn't necessarily mean it's safe. For example, if I have the following two classes:

public class Parent {
    public Parent() {
        System.out.println(getClass().getName());
    }
}

和：

public class Derived extends Parent {
    public Derived() {
        super();
    }

    public static void main(String... args) {
        new Derived();
    }
}

当我运行 main （）方法在它打印的Derived类中： Derived （这是我希望的）。但是我可以依靠JVM上的这种行为吗？

When I run the main() method in the Derived class it prints: Derived (which is what I was hoping). But can I rely on that behavior across JVMs?

推荐答案

getClass Object 的方法之一并返回 的运行时类：

返回此对象的运行时类。返回的Class对象是被表示类的静态同步方法锁定的对象。

Returns the runtime class of this Object. The returned Class object is the object that is locked by static synchronized methods of the represented class.

code>派生。

So yes, it will always return Derived.

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