Thread--两线程交替打印 

 1 package t3.copy;
 2 
 3 public class ThreadA extends Thread {
 4     
 5     private Object lock;
 6 
 7     public ThreadA(Object lock) {
 8         super();
 9         this.lock = lock;
10     }
11 
12     @Override
13     public void run() {
14         try {
15             while(true) {
16                 synchronized (lock) {
17                     if(Run.flag) {
18                         System.out.println(Thread.currentThread().getName() + " ~~~~ ");
19                         Run.flag = !Run.flag;
20                         lock.wait();
21                     }
22                 }
23             }
24         } catch (Exception e) {
25             e.printStackTrace();
26         }
27     }
28     
29     
30 
31 }
 1 package t3.copy;
 2 
 3 public class ThreadB extends Thread {
 4     
 5     private Object lock;
 6 
 7     public ThreadB(Object lock) {
 8         super();
 9         this.lock = lock;
10     }
11 
12     @Override
13     public void run() {
14         try {
15             while(true) {
16                 synchronized (lock) {
17                     if(!Run.flag) {
18                         System.out.println(Thread.currentThread().getName() + " !!!! ");
19                         Run.flag = !Run.flag;
20                         lock.notify();
21                     }
22                 }
23                 
24             }
25         } catch (Exception e) {
26             e.printStackTrace();
27         }
28     }
29     
30     
31 
32 }
 1 package t3.copy;
 2 
 3 public class Run {
 4     
 5     public static boolean flag = true;
 6     
 7     public static void main(String[] args) {
 8         try {
 9             Object lock = new Object();
10             ThreadA a = new ThreadA(lock);
11             a.start();
12             Thread.sleep(50);
13             ThreadB b = new ThreadB(lock);
14             b.start();
15         } catch (InterruptedException e) {
16             e.printStackTrace();
17         }
18     }
19 }

不知道可不可以不借助于中间变量判断。

 

不借助于中间变量判断，但是交替打印次数一致。

 1 package conditionTest.copy;
 2 
 3 import java.util.concurrent.locks.Condition;
 4 import java.util.concurrent.locks.ReentrantLock;
 5 
 6 public class MyService {
 7     
 8     private ReentrantLock lock = new ReentrantLock();
 9     private Condition conditionSet = lock.newCondition();
10     private Condition conditionGet = lock.newCondition();
11     
12     public void set() {
13         try {
14             lock.lock();
15 //            while(hasValue) {
16 //            }
17             System.out.println("打印★★★★★★");
18             conditionGet.signal();
19             conditionSet.await();
20         } catch (Exception e) {
21             // TODO: handle exception
22             e.printStackTrace();
23         } finally {
24             lock.unlock();
25         }
26     }
27     
28     public void get() {
29         try {
30             lock.lock();
31             System.out.println("打印☆☆☆☆☆☆");
32             conditionSet.signal();
33             conditionGet.await();
34         } catch (Exception e) {
35             // TODO: handle exception
36             e.printStackTrace();
37         } finally {
38             lock.unlock();
39         }
40     }
41 
42 }
 1 package conditionTest.copy;
 2 
 3 public class MyThreadA extends Thread {
 4     
 5     private MyService service;
 6 
 7     public MyThreadA(MyService service) {
 8         super();
 9         this.service = service;
10     }
11 
12     @Override
13     public void run() {
14         for(int i=0; i<100; i++) {
15             service.set();
16         }
17     }
18     
19     
20 
21 }
 1 package conditionTest.copy;
 2 
 3 public class MyThreadB extends Thread {
 4     
 5     private MyService service;
 6 
 7     public MyThreadB(MyService service) {
 8         super();
 9         this.service = service;
10     }
11 
12     @Override
13     public void run() {
14         for(int i=0; i<100; i++) {
15             service.get();
16         }
17     }
18     
19     
20 
21 }
 1 package conditionTest.copy;
 2 
 3 public class Run {
 4     
 5     public static void main(String[] args) {
 6         MyService service = new MyService();
 7         MyThreadA a = new MyThreadA(service);
 8         a.start();
 9         MyThreadB b = new MyThreadB(service);
10         b.start();
11     }
12 
13 }

 

posted @ 2017-02-04 13:43  MicroCat  阅读(321)  评论(0)  编辑  收藏  举报