这是计算对象实例的有效方法吗？ [英] Is this a valid way to count instances of objects?

问题描述

这是计算对象实例的有效方法吗？或者我不应该覆盖finalize？

Is this a valid way to count instances of objects? Or should I not override finalize?

public class MyClass{
    private int instances;
   public MyClass(){
       instances++;
   }    
   @Override
   public void finalize(){
       instances--;
   }
   public static int getInstances(){
       return instances;
   }
}

解决方案不必是线程安全

The solution doesn't have to be Thread safe

推荐答案

将实例标记为静态不稳定。其次，从不覆盖 finalize 方法。此外，在代码AS-IS中，请注意您无法访问 public static int getInstances 实例变量>方法。

Mark instancesas static volatile. And secondly, never override the finalize method. Also, in the code AS-IS, note that you can't access to instances variable in your public static int getInstances method.

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