在java中删除类对象 [英] Deleting a class object in java

问题描述

我有一个名为 Point 的课程如下：

I have a class named Point as below:

public class Point {
    public int x;
    public int y;

    public Point(int X, int Y){
        x = X;
        y = Y;
    }

    public double Distance(Point p){
        return sqrt(((this.x - p.x) * (this.x - p.x)) + ((this.y - p.y) * (this.y - p.y)));
    }

    protected void finalize()
    {
        System.out.println( "One point has been destroyed.");
    } 
}

我有一个名为<$ c的类中的对象$ c> p 如下：

Point p = new Point(50,50);

我想删除这个对象，我搜索了怎么做，我找到的唯一解决方案是：

I want to delete this object, I searched how to do it, the only solution I found was:

p = null;

但是在我做完之后，Point的finalize方法不起作用。我该怎么办？

But the finalize method of Point didn't work after I did it. What can I do?

推荐答案

执行 p = null; 您的点的最后一个引用被删除，垃圾收集器现在收集实例，因为没有对此实例的引用。如果你调用 System.gc（）; ，垃圾回收器将回收未使用的对象并调用这个对象的finalize方法。

After you do p = null; the last reference of your point is deleted and the garbage collector collects the instance now because there is no reference to this instance. If you call System.gc(); the garbage collector will recycle unused objects and invoke the finalize methods of this objects.

    Point p = new Point(50,50);
    p = null;
    System.gc();

输出：一个点已被销毁。

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