wait() notify() notifyAll() 使用范例

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代码是最好的文档，直接看代码吧

package thread;import org.junit.Test;/** * wait() notify() notifyAll() * 这3个方法是Object基类的native方法，要调用这些方法的线程必须持有对象的锁 * * @author Dean */public class Thread_06_WaitAndNotify {private class Thread0 extends Thread {private final Object obj;Thread0(Object obj) {this.obj = obj;}@Overridepublic void run() {synchronized (obj) {String threadName = Thread.currentThread().getName();System.out.println(threadName + "获取到了对象的锁");try {System.out.println(threadName + "开始wait()并释放对象的锁");obj.wait();System.out.println(threadName + "重新获取到对象的锁");//并不是醒了就能重新获取到锁，还得等其他线程释放对象锁} catch (InterruptedException e) {e.printStackTrace();}}}}private class Thread1 extends Thread {private final Object obj;Thread1(Object obj) {this.obj = obj;}@Overridepublic void run() {synchronized (obj) {String threadName = Thread.currentThread().getName();System.out.println(threadName + "获取到了对象的锁");System.out.println(threadName + "开始唤醒等待对象锁的其他线程");obj.notify();//obj.notifyAll(); //一般情况下调用notifyAll()更合理，《java编程思想 4th》并发一章有具体解释try {System.out.println(threadName + "开始sleep()一段时间并继续持有对象的锁");Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(threadName + "释放对象的锁");}}}@Testpublic void test() {Object obj = new Object();Thread0 thread0 = new Thread0(obj);Thread1 thread1 = new Thread1(obj);thread0.start();thread1.start();try {Thread.sleep(3000);} catch (InterruptedException e) {e.printStackTrace();}}}

控制台输出：

Thread-0获取到了对象的锁
Thread-0开始wait()并释放对象的锁
Thread-1获取到了对象的锁
Thread-1开始唤醒等待对象锁的其他线程
Thread-1开始sleep()一段时间并继续持有对象的锁
Thread-1释放对象的锁
Thread-0重新获取到对象的锁

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