Java中的getClass方法 [英] getClass method in java

问题描述

Object类中的getClass方法如何能够动态返回Class?

How is it that the getClass method in Object class is capable of dynamically returning Class?

推荐答案

它不返回类 name -它返回表示该对象类型的 Class .每个对象都知道"它实际上是什么类型-这取决于执行时间类型，即强制转换如何工作或失败. Object.getClass()只是从对象中检索相关信息.

It doesn't return the class name - it returns the Class representing that object's type. Each object "knows" what type it really is - that's how casts can work or fail depending on the execution-time type. Object.getClass() just retrieves the relevant information from the object.

如果您有一个仅包含单个 int 的类，则每个对象在内存中仍将占用4个以上的字节:实际上是一个对象标头"，其中包含对对象的引用等内容实际类型，与该对象关联的监视器有关的信息等.

If you have a class which only contains a single int, each object will still take up more than 4 bytes in memory: there's effectively an object "header" containing things like a reference to the object's actual type, information to do with the monitor associated with that object etc.

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