问题描述
垃圾收集器何时会清除使用单例模式的对象实例?
When would the garbage collector erase an instance of an object that uses Singleton pattern?
物体是否比普通物体停留的时间更长?
Does an object hang around any longer than a regular object?
如何在 Java 中手动强制删除/垃圾回收对象?
How can you manually force deletion/garbage collection of an object in Java?
谢谢.
推荐答案
有一个对单例的静态引用，所以在类加载器符合垃圾回收条件之前，它不符合垃圾回收条件.
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.
您不能强制对任何对象进行垃圾回收；您可以请求垃圾收集器使用 System.gc() 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.
如果您真的想让单例"符合垃圾回收的条件，您可能希望有一种方法将静态变量设置为 null(并希望没有其他任何东西获取引用的副本).显然，下次有人请求实例时，需要重新创建它……当然，此时它并不是真正的单例.
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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