注：本文的目的并不是鼓励使用finalize方法，而是大致理清其作用、问题以及GC执行finalize的过程。
public class GC {
public static GC SAVE_HOOK = null;
public static void main(String[] args) throws InterruptedException {
SAVE_HOOK = new GC();
SAVE_HOOK = null;
System.gc();
Thread.sleep(500);
if (null != SAVE_HOOK) { //此时对象应该处于(reachable, finalized)状态
System.out.println("Yes , I am still alive");
} else {
System.out.println("No , I am dead");
}
SAVE_HOOK = null;
System.gc();
Thread.sleep(500);
if (null != SAVE_HOOK) {
System.out.println("Yes , I am still alive");
} else {
System.out.println("No , I am dead");
}
}
@Override
protected void finalize() throws Throwable {
super.finalize();
System.out.println("execute method finalize()");
SAVE_HOOK = this;
}
}
java finalize方法总结、GC执行finalize的过程
原文：https://www.cnblogs.com/shoshana-kong/p/10575879.html