1 public class App {
 2 
 3     public static void main(String[] args) {
 4         testMain();
 5     }
 6     
 7     public static void testMain(){
 8         //实例化一个子线程
 9         Thread th = new Thread(new Runnable() {
10             
11             @Override
12             public void run() {
13                 for(int i=0; i<50; i++){
14                     try {
15                         Thread.sleep(1000);
16                     } catch (InterruptedException e) {
17                         e.printStackTrace();
18                     }
19                     System.out.println("我是子线程......"+i);
20                 }
21             }
22         });
23         
24         //子线程开启
25         th.start();
26         
27         //主线程
28         for(int i=0; i<10; i++){
29             try {
30                 Thread.sleep(1000);
31             } catch (InterruptedException e) {
32                 e.printStackTrace();
33             }
34             System.out.println("主线程："+i);
35         }
36             
37         try {
38             //Thread.join
39             th.join();
40         } catch (InterruptedException e) {
41             e.printStackTrace();
42         }
43         
44         System.out.println("主线程结尾处.....");
45     }
46 
47 }