JVM·垃圾收集器与内存分配策略之对象是否可被回收！

**
* Created by KEY on 2017/12/4.
*/
public class FinalizeEscapeGC {
    public static FinalizeEscapeGC SAVA_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.SAVA_HOOK = this;
    }

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

        //对象第一次拯救自己
        SAVA_HOOK = null;
        System.gc();
        //因为finalize优先级很低，所以等他0.5s
        Thread.sleep(500);
        if(SAVA_HOOK != null){
            SAVA_HOOK.isAlive();
        }else{
            System.out.println("no,I am dead :(");
        }

        //重复以上代码，看是否能第二次拯救自己
        //对象第一次拯救自己
        SAVA_HOOK = null;
        System.gc();
        //因为finalize优先级很低，所以等他0.5s
        Thread.sleep(500);
        if(SAVA_HOOK != null){
            SAVA_HOOK.isAlive();
        }else{
            System.out.println("no,I am dead :(");
        }
    }
}