在main方法中，有4个LockSupport.unpark方法，当t1线程运行时应该Lock.park()不应该堵塞代码，但是实际是堵塞的为什么,为什么main方法中注释中的方法就可以输出11111，park方法没有阻塞当前进程。

public class LockSupportDemo {
    public static Object u = new Object();
    static ChangeObjectThread t1 = new ChangeObjectThread("t1");
    

    public static class ChangeObjectThread extends Thread{

        public ChangeObjectThread(String name)
        {
            super.setName(name);
        }

        @Override
        public void run() {
            synchronized (u)
            {

                LockSupport.park(Thread.currentThread());
                System.out.println("in "+ getName());
                if(Thread.interrupted())
                {
                    System.out.println(getName()+" interrupted");
                }
            }
            System.out.println(getName() +"isOver");

        }
    }

    public static void main(String[] args) throws InterruptedException {
        LockSupport.unpark(t1);
        LockSupport.unpark(t1);
        LockSupport.unpark(t1);
        LockSupport.unpark(t1);
        LockSupport.unpark(t1);
        t1.start();
        /**
        *LockSupport.unpark(Thread.cuurentThread);
        *LockSupport.unpark(Thread.cuurentThread);
        *Lock.park();
        *System.out.println("11111");
        *
        */
    }
}