Java魔法堂：finalize函数

class FinalizeEscapeGC{
  public static FinalizeEscapeGC SAVE_HOOK = null;
  public void isAlive(){
     System.out.println("yes, i am still alive;");
  }

  @override
  protected void finalize() throws Throwable{
    super.finalize();
    System.out.println("finalize method executed!");
    FinalizeEscapeGC.SAVE_HOOK = this;
  }

  public static void main(String[] args) throws Throwable{
      SAVE_HOOK = new FinalizeEscapeGC();

      SAVE_HOOK = null;
      System.gc();
      Thread.sleep(500);
      if (SAVE_HOOK == null) SAVE_HOOK.isAlive();
      else System.out.println("no, i am dead :(");
            
      SAVE_HOOK = null;
      System.gc();
      Thread.sleep(500);
      if (SAVE_HOOK == null) SAVE_HOOK.isAlive();
      else System.out.println("no, i am dead :(");
  }
}