问题描述
垃圾收集器何时会清除使用Singleton模式的对象的实例？
When would the garbage collector erase an instance of an object that uses Singleton pattern?
某个对象是否比常规对象更久一些？
Does an object hang around any longer than a regular object?
如何在Java中手动强制删除/垃圾收集对象？
How can you manually force deletion/garbage collection of an object in Java?
谢谢。
推荐答案
有一个静态引用单例，所以在类加载器有资格进行垃圾收集之前，它将不符合垃圾收集的资格。
There's a static reference to a singleton, so it won't be eligible for garbage collection until the classloader is eligible for garbage collection.
你不能强制任何对象被垃圾收集;您可以通过，但这只是一个请求。
You can't force any object to be garbage collected; you can request that the garbage collector runs with System.gc() but it's only a request.
如果你真的想让一个单身人士符合垃圾收集条件，你可能希望有一个方法来将静态变量设置为空（并且希望没有其他的使用引用的副本）。显然，下一次有人要求一个实例，它将需要重新创建...在这一点上，它不是一个真正的单身，当然。
If you really want to make a "singleton" eligible for garbage collection, you'd probably want to have a method to set the static variable to null (and hope that nothing else had taken a copy of the reference). Obviously the next time anyone asked for an instance, it would need to be recreated... at which point it's not really a singleton, of course.
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