是否可以将Object本身设置为null？ [英] Is it possible to set an Object to be null from within itself?

问题描述

我知道 this = null 是非法的。

我想知道是否还有其他办法有一个物体清理自己。

I'm wondering if there's some other way to have an object clean itself up.

我希望能够做到这样的事情：

my desire is to be able to do something like this:

A a = new A();

a.doStuffAndDisappear();

if(a == null){
     //this is true after my doStuffAndDisappear() method.
}

我怀疑没有办法让这种情况发生，但我认为值得问。

I suspect there's no way to make this happen, but thought it would be worth asking.

推荐答案

不，因为 a 是一个参考（不是像这个问题标题中的对象）并且没有方法可以修改引用的值，除了定义它的方法（我假设从代码上下文 a 是一个局部变量。）

No, because a is a reference (not an object as in this question's title) and no method can modify the value of a reference except the method in which it is defined (I assume from the code context that a is a local variable).

由于Java没有pass-by-reference，你提出的问题无法完成：没有办法收集地址的引用，以便管理指向的地址。您可以使用包装器对象，但不确定它是什么意思。

Since Java doesn't have pass-by-reference, what you ask cannot be done: there's no way to collect addresses-of references in order to manage the addresses pointed to. You might use a wrapper object, but not sure what'd be the point.

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