Java Finalize方法未调用

Question

这是一段代码。finalize()方法应该在System.gc()命令之后调用，但它没有。有什么建议吗？

class test123{
    test123(){
        System.out.println("Inside the constructor");

    }
}
public class finalizemerthd {

    public static void main(String args[]) {
        test123 obj1 = new test123();
        obj1 = null;
        System.gc();

    }

    protected void finalize() throws Throwable
    {
        System.out.println("Garbage collector called");
        System.out.println("Object garbage collected : " + this);
    }
}

Answer 1

System.gc()只请求收集，不保证垃圾收集。

此外，finalize方法被调用于其对象正在被垃圾回收的类，这在您的场景中不是这种情况。

请在下面找到更新后的代码和输出：

class Test123 {
    Test123() {
        System.out.println("Inside the constructor");
    }

    @Override
    protected void finalize() throws Throwable {
        System.out.println("Garbage collector called");
        System.out.println("Object garbage collected : " + this);
    }
}

public class Finalizemerthd {
    public static void main(String args[]) {
        Test123 obj1 = new Test123();
        obj1 = null;
        System.gc();
    }
}

输出：

Inside the constructor
Garbage collector called
Object garbage collected : MyGenerator.Test123@11adfb87