多线程模拟对同一个账户，一个来存款一个来取款

QCHuangChao

多线程访问共享数据

1. package thread;
   
2. 
   
3. /**
   
4. * 多线程模拟一个存 一个取，存完通知另一个来取
   
5. */
   
6. public class ImitateDepositDrawTheadTest {
   
7.      
   
8.     public static void main(String[] args) {
   
9.          
   
10.         final DepositOrWithdrawBusiness business = new DepositOrWithdrawBusiness(1000);
    
11.         new Thread(new Runnable(){
    
12.             @Override
    
13.             public void run() {
    
14.                 while(true){
    
15.                     business.deposit();
    
16.                 }
    
17.             }
    
18.         }).start();
    
19.         new Thread(new Runnable(){
    
20.             @Override
    
21.             public void run() {
    
22.                 while(true){
    
23.                     business.withdraw();
    
24.                 }
    
25.             }
    
26.         }).start();
    
27.          
    
28.          
    
29.     }
    
30. }
    
31. class DepositOrWithdrawBusiness{
    
32.     int balance = 1000;
    
33.     public DepositOrWithdrawBusiness(int balance){
    
34.         this.balance = balance;
    
35.     }
    
36.     boolean isWithdraw = false;
    
37.     public synchronized void deposit(){
    
38.         if(isWithdraw){
    
39.             try {
    
40.                 this.wait();
    
41.             } catch (InterruptedException e) {
    
42.                 e.printStackTrace();
    
43.             }
    
44.         }
    
45.         balance = balance+300;
    
46.         System.out.println(Thread.currentThread().getName()+ " deposit $300,now balance:" + balance);
    
47.         isWithdraw=true;
    
48.         this.notify();
    
49.          
    
50.     }
    
51.     public synchronized void withdraw(){
    
52.         if(!isWithdraw){
    
53.             try {
    
54.                 this.wait();
    
55.             } catch (InterruptedException e) {
    
56.                 e.printStackTrace();
    
57.             }
    
58.         }
    
59.         balance = balance-300;
    
60.         System.out.println(Thread.currentThread().getName()+ " withdraw $300,now balance:" + balance);
    
61.         isWithdraw=false;
    
62.         this.notify();
    
63.     }
    
64. }

复制代码

运行结果：
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
Thread-0 deposit $300,now balance:1300
Thread-1 withdraw $300,now balance:1000
。。。