wait/notify方法

执行wait方法会释放锁，执行notify不会释放锁

 1 package com.qf.test05.pojo;
 2 
 3 /**
 4  * @author qf
 5  * @create 2018-09-18 10:41
 6  */
 7 public class Service {
 8     public void testMethod(Object lock){
 9         try {
10             synchronized (lock){
11                 System.out.println("begin wait");
12                 lock.wait();
13                 System.out.println("end wait");
14             }
15         } catch (InterruptedException e) {
16             e.printStackTrace();
17         }
18     }
19 }

线程类

 1 package com.qf.test05.thread;
 2 
 3 import com.qf.test05.pojo.Service;
 4 
 5 /**
 6  * @author qf
 7  * @create 2018-09-18 10:43
 8  */
 9 public class ThreadA extends Thread {
10     private Object lock;
11 
12     public ThreadA(Object lock) {
13         this.lock = lock;
14     }
15 
16     @Override
17     public void run() {
18         Service service = new Service();
19         service.testMethod(lock);
20     }
21 }
 1 package com.qf.test05.thread;
 2 
 3 import com.qf.test05.pojo.Service;
 4 
 5 /**
 6  * @author qf
 7  * @create 2018-09-18 10:43
 8  */
 9 public class ThreadB extends Thread {
10     private Object lock;
11 
12     public ThreadB(Object lock) {
13         this.lock = lock;
14     }
15 
16     @Override
17     public void run() {
18         Service service = new Service();
19         service.testMethod(lock);
20     }
21 }

测试运行

 1 package com.qf.test05;
 2 
 3 import com.qf.test05.thread.ThreadA;
 4 import com.qf.test05.thread.ThreadB;
 5 
 6 /**
 7  * @author qf
 8  * @create 2018-09-18 10:44
 9  */
10 public class Run {
11     public static void main(String[] args) {
12         Object lock = new Object();
13         ThreadA a = new ThreadA(lock);
14         a.start();
15         ThreadB b = new ThreadB(lock);
16         b.start();
17     }
18 }

控制台输出结果

begin wait
begin wait

证明了wait方法执行后会释放锁

========================================================================

 1 package com.qf.test06.pojo;
 2 
 3 /**
 4  * @author qf
 5  * @create 2018-09-18 14:05
 6  */
 7 public class Service {
 8     public void testWait(Object lock){
 9         try {
10             synchronized (lock){
11                 System.out.println("线程名："+Thread.currentThread().getName()+", begin wait time="+System.currentTimeMillis());
12                 lock.wait();
13                 System.out.println("线程名："+Thread.currentThread().getName()+", --end wait time="+System.currentTimeMillis());
14             }
15         } catch (InterruptedException e) {
16             e.printStackTrace();
17         }
18     }
19 
20     public void testNotify(Object lock){
21         try {
22             synchronized (lock){
23                 System.out.println("线程名："+Thread.currentThread().getName()+", begin notify time="+System.currentTimeMillis());
24                 lock.notify();
25                 Thread.sleep(5000);
26                 System.out.println("线程名："+Thread.currentThread().getName()+", --end notify time="+System.currentTimeMillis());
27             }
28         } catch (InterruptedException e) {
29             e.printStackTrace();
30         }
31     }
32 }

线程类

 1 package com.qf.test06.thread;
 2 
 3 import com.qf.test06.pojo.Service;
 4 
 5 /**
 6  * @author qf
 7  * @create 2018-09-18 14:07
 8  */
 9 public class ThreadA extends Thread {
10     private Object lock;
11 
12     public ThreadA(Object lock) {
13         this.lock = lock;
14     }
15 
16     @Override
17     public void run() {
18         Service service = new Service();
19         service.testWait(lock);
20     }
21 }
 1 package com.qf.test06.thread;
 2 
 3 import com.qf.test06.pojo.Service;
 4 
 5 /**
 6  * @author qf
 7  * @create 2018-09-18 14:11
 8  */
 9 public class ThreadB extends Thread {
10     private Object lock;
11 
12     public ThreadB(Object lock) {
13         this.lock = lock;
14     }
15 
16     @Override
17     public void run() {
18         Service service = new Service();
19         service.testNotify(lock);
20     }
21 }
 1 package com.qf.test06.thread;
 2 
 3 import com.qf.test06.pojo.Service;
 4 
 5 /**
 6  * @author qf
 7  * @create 2018-09-18 14:11
 8  */
 9 public class ThreadC extends Thread {
10     private Object lock;
11 
12     public ThreadC(Object lock) {
13         this.lock = lock;
14     }
15 
16     @Override
17     public void run() {
18         Service service = new Service();
19         service.testNotify(lock);
20     }
21 }

测试运行

 1 package com.qf.test06;
 2 
 3 import com.qf.test06.thread.ThreadA;
 4 import com.qf.test06.thread.ThreadB;
 5 import com.qf.test06.thread.ThreadC;
 6 
 7 /**
 8  * @author qf
 9  * @create 2018-09-18 14:13
10  */
11 public class Run {
12     public static void main(String[] args) {
13         Object lock = new Object();
14         ThreadA a = new ThreadA(lock);
15         a.setName("A");
16         a.start();
17         ThreadB b = new ThreadB(lock);
18         b.setName("B");
19         b.start();
20         ThreadC c = new ThreadC(lock);
21         c.setName("C");
22         c.start();
23     }
24 }

打印结果

线程名：A, begin wait time=1537252123977
线程名：B, begin notify time=1537252123978
线程名：B, --end notify time=1537252128978
线程名：A, --end wait time=1537252128978
线程名：C, begin notify time=1537252128978
线程名：C, --end notify time=1537252133978

证明了notify方法执行后并不会释放锁

 

posted @ 2018-09-18 14:30  *青锋*  阅读(197)  评论(0)  编辑  收藏  举报