垃圾收集器何时会擦除使用单例模式的对象的实例?

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.

这篇关于垃圾收集器何时会擦除使用单例模式的对象的实例?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！