(原)测试 Java中Synchronized锁定对象的用法

• Z时代
• 2024-01-10
• 分类：综合

今天再android_serial_port中看到了关键字 synchronized;因为刚好在学java和android，所以就查了一下它的用法：

于是把代码中的一小段代码拿了出来，做了一下修改，测试了下，结果出现的情况：

 1 public class syncThreadDemo {
 2 
 3     public static void main(String[] args) {
 4         // TODO Auto-generated method stub
 5         /*测试1*/
 6 //        Account account = new Account("zhang san", 10000.0f);
 7 //        AccountOperator accountOperator = new AccountOperator(account);
 8 //
 9 //        final int THREAD_NUM = 5;
10 //        Thread threads[] = new Thread[THREAD_NUM];
11 //        for (int i = 0; i < THREAD_NUM; i ++) {
12 //           threads[i] = new Thread(accountOperator, "Thread" + i);
13 //           threads[i].start();
14 //        }
15         
16         /*测试2*/
17         
18         Thread thread1=new Thread(new syncThreadDemo().new SendingThread("send1"),"thread1");
19         thread1.start();
20         Thread thread2=new Thread(new syncThreadDemo().new ReceiveThread("recv1"),"thread2");
21         thread2.start();
22         
23     }
24     /*创建一个内部类来测试synchronized锁定一个对象*/
25     static Object mByteReceivedBackSemaphore = new Object();
26 
27     private class SendingThread implements Runnable{
28         private int i=0;
29         private String name;
30         //创建一个构造函数
31         public SendingThread(String strName) {
32             // TODO Auto-generated constructor stub
33             this.name=strName;
34         }
35         
36         @Override
37         public void run(){
38             while (i<10) {
39                 synchronized (mByteReceivedBackSemaphore) {
40                     try {
41                         // Wait for 100ms before sending next byte, or as soon as
42                         // the sent byte has been read back.
43                         System.out.println(Thread.currentThread().getName()+": wait");
44                         mByteReceivedBackSemaphore.wait(100);
45                         i++;
46                         System.out.println(Thread.currentThread().getName()+":"+i);
47                     } 
48                     catch (Exception e) {
49                         // TODO: handle exception
50                     }    
51                 }
52             }
53         }
54      }
55 
56      private class ReceiveThread implements Runnable{
57         private int j=0;
58         private String name;
59         
60         public ReceiveThread(String strName) {
61             // TODO Auto-generated constructor stub
62             this.name=strName;
63         }
64         
65         @Override
66         public void run(){
67             while(j<10){
68                 synchronized(mByteReceivedBackSemaphore){
69                     System.out.println(Thread.currentThread().getName()+": notify");
70                     mByteReceivedBackSemaphore.notify();    
71                     j++;
72                     System.out.println(Thread.currentThread().getName()+":"+j);
73                 }
74             }
75         }
76      }
77 }

View Code

测试结果：

thread1: wait
thread2: notify
thread2:1
thread2: notify
thread2:2
thread2: notify
thread2:3
thread2: notify
thread2:4
thread2: notify
thread2:5
thread2: notify
thread2:6
thread2: notify
thread2:7
thread2: notify
thread2:8
thread2: notify
thread2:9
thread2: notify
thread2:10
thread1:1
thread1: wait
thread1:2
thread1: wait
thread1:3
thread1: wait
thread1:4
thread1: wait
thread1:5
thread1: wait
thread1:6
thread1: wait
thread1:7
thread1: wait
thread1:8
thread1: wait
thread1:9
thread1: wait
thread1:10

View Code

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