Java线程等待与唤醒

class threada extends thread{

    public threada(string name) {
        super(name);
    }

    public void run() {
        synchronized (this) {
            system.out.println(thread.currentthread().getname()+" call notify()");
            notify();
        }
    }
}

public class waittest {

    public static void main(string[] args) {

        threada t1 = new threada("t1");

        synchronized(t1) {
            try {
                // 启动“线程t1”
                system.out.println(thread.currentthread().getname()+" start t1");
                t1.start();

                // 主线程等待t1通过notify()唤醒。
                system.out.println(thread.currentthread().getname()+" wait()");
                t1.wait();

                system.out.println(thread.currentthread().getname()+" continue");
            } catch (interruptedexception e) {
                e.printstacktrace();
            }
        }
    }
}

输出结果：main start t1 -> main wait() -> t1 call notify() -> main continue

其实调用t1.start()，t1为就绪状态，只是main方法中，t1被main线程锁住了，t1.wait()的时候，让当前线程等待，其实是让main线程等待了，然后释放了t1锁，t1线程执行，打印t1 call notify()，然后唤醒main线程，最后结束；