对象死后自救

package com.afan.test;

public 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();
        //对象第一次成功拯救自己
        SAVE_HOOK = null;
        System.gc();
        //因为finalize方法优先级很低，所以暂停0.5秒等待他
        Thread.sleep(500);

        if(SAVE_HOOK != null){
            SAVE_HOOK.isAlive();
        }else{
            System.out.println("dead le");
        }
    }

}