Java 如何销毁单例实例
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Java How to destroy Singleton instance
提问by user1603602
I have a singleton that is created like that
我有一个像这样创建的单身人士
private static class SingletonHolder {
public static Singleton INSTANCE = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}
I'd like to reset the singleton instance at a certain time. (I'm sure at this time it is safe to reset the singleton instance). I tried to remove the final specifier and set the instance to null when I want to reset it but the problem is how to get another instance (It will remain null)
我想在某个时间重置单例实例。（我确定此时重置单例实例是安全的）。当我想重置它时，我尝试删除最终说明符并将实例设置为 null 但问题是如何获取另一个实例（它将保持为 null）
Another question is is it safe to remove the final specifier inside the SingletonHolder.
另一个问题是删除 SingletonHolder 中的最终说明符是否安全。
Thanks
谢谢
采纳答案by Polentino
If you reallyneed to reset a singleton instance (which doesn't makes much sense actually) you could wrap all its inner members in a private object, and reinitialize via an explicit initialize()and reset()methods.
That way, you can preserve your singleton istance and provide some kind of "reset" functionality.
如果您真的需要重置一个单例实例（实际上没有多大意义），您可以将其所有内部成员包装在一个私有对象中，并通过显式initialize()和reset()方法重新初始化。这样，您可以保留单例实例并提供某种“重置”功能。
回答by Polentino
you would provide a package-visible(default access level) method for other classes to be able to reset the singleton, something like this
您将为其他类提供一个包可见（默认访问级别）方法，以便能够重置单例，就像这样
class SingleGuy{
private static SingleGuy=new SingleGuy();//eager init mode
synchronized static void initTheGuy(){
SingleGuy=new SingleGuy();//while this not recommended!
}
synchronized static void resetTheInstance(){
/*Reset the singleton state as you wish. just like you reinitialized*/
}
}
