java可以在对象仍在范围内时对其进行最终确定吗?

I've been looking into a bug in my code that seems to be caused by some "ugly" finalizer code. The code looks roughly like this

public class A {
   public B b = new B();
   @Override public void finalize() {
     b.close();
   }
}

public class B {
   public void close() { /* do clean up our resources. */ }
   public void doSomething() { /* do something that requires us not to be closed */ } 
}

void main() {
   A a = new A();
   B b = a.b;
   for(/*lots of time*/) {
     b.doSomething();
   }
}

我认为正在发生的是 a 被检测为在 main() 的第二行之后没有引用，并被终结器进行 GC 和终结线程 - 当 for 循环仍在发生时，使用 b 而 a 仍然在范围内".

class A {
    @Override protected void finalize() {
        System.out.println(this + " was finalized!");
    }

    public static void main(String[] args) {
        A a = new A();
        System.out.println("Created " + a);
        for (int i = 0; i < 1_000_000_000; i++) {
            if (i % 1_000_000 == 0)
                System.gc();
        }
        // System.out.println(a + " was still alive.");
    }
}