java这个关键字 [英] java this keyword

问题描述

我已经读过，在Java中你不必将 this 关键字显式绑定到object，它由解释器完成。它与Javascript相反，您始终必须知道此的值。但是Java中的这个在哪里指向类或对象？或者它有变化吗？
这个问题是我尝试理解基本OO概念和设计模式的一部分，因此我可以将它们应用于Javascript。
谢谢。

I have read that in Java you don't have to explicitly bind the this keyword to object, it is done by interpreter. It is opposite to Javascript where you always have to know the value of this. But where is this in Java is pointing - to class or object ? Or does it vary ? This question is a part of my attempt to understand basic OO concepts and design patterns so I can apply them to Javascript. Thank you.

推荐答案

Java语言规范声明：

当用作主表达式时，关键字this表示值
，它是对实例方法为
调用的对象（第15.12节）或对正在构造的对象的引用。

When used as a primary expression, the keyword this denotes a value that is a reference to the object for which the instance method was invoked (§15.12), or to the object being constructed.

即它总是指向一个对象，而不是一个类。

I.e. it always points to an object, not a class.

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