架构师养成记--5.线程之间的通信

用wait和notify来实现线程之间的通信，这两个方法是object方法，这两个方法必须要配合synchronized使用。wait方法释放锁，notify不释放锁。

原始线程通信方式

 1 import java.util.ArrayList;
 2 import java.util.List;
 3 
 4 public class ListAdd1 {
 5 
 6     
 7     private volatile static List list = new ArrayList();    
 8     
 9     public void add(){
10         list.add("bjsxt");
11     }
12     public int size(){
13         return list.size();
14     }
15     
16     public static void main(String[] args) {
17         
18         final ListAdd1 list1 = new ListAdd1();
19         
20         Thread t1 = new Thread(new Runnable() {
21             @Override
22             public void run() {
23                 try {
24                     for(int i = 0; i <10; i++){
25                         list1.add();
26                         System.out.println("当前线程：" + Thread.currentThread().getName() + "添加了一个元素..");
27                         Thread.sleep(500);
28                     }    
29                 } catch (InterruptedException e) {
30                     e.printStackTrace();
31                 }
32             }
33         }, "t1");
34         
35         Thread t2 = new Thread(new Runnable() {
36             @Override
37             public void run() {
38                 while(true){
39                     if(list1.size() == 5){
40                         System.out.println("当前线程收到通知：" + Thread.currentThread().getName() + " list size = 5 线程停止..");
41                         throw new RuntimeException();
42                     }
43                 }
44             }
45         }, "t2");        
46         
47         t1.start();
48         t2.start();
49     }
50     
51     
52 }

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