package threadcoreknowledge.threadobjectclasscommonmethods;

/**  展示wait和notify的基本用法
 * 1.研究代码的执行顺序
 * 2.证明wait释放锁
 * @author Just Happy
 */
public class Wait {
    public static Object object = new Object();
    static class Thread1 extends Thread{
        @Override
        public void run() {
            synchronized (object){
                System.out.println("线程"+Thread.currentThread().getName()+"开始执行了");
                try {
                    //释放锁
                    object.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("线程"+Thread.currentThread().getName()+"获得了锁");
            }
        }
    }
    static class Thread2 extends Thread{
        @Override
        public void run() {
            synchronized (object){
                // notify不会立刻释放锁，会把代码块执行完
                object.notify();
                System.out.println("线程"+Thread.currentThread().getName()+"调用了notify()");
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        Thread1 thread1 = new Thread1();
        Thread1 thread2 = new Thread1();
        Thread2 thread3 = new Thread2();
        thread1.start();
        Thread.sleep(300);
        thread2.start();
        Thread.sleep(300);
        thread3.start();
    }
}

实验结果：

我的理解是Thread1的两个实例只有一个会获得锁，但是为什么好像一开始都打印出那句话了，synchronzied关键字的范围怎么变小了啊？