Java--Runtime.addShutdownHook

 1 public class TestRuntimeShutdownHook {
 2     public static void main(String[] args) {
 3 
 4         Thread shutdownHookOne = new Thread() {
 5             public void run() {
 6                 System.out.println("shutdownHook one...");
 7             }
 8         };
 9         Runtime.getRuntime().addShutdownHook(shutdownHookOne);
10 
11         Runnable threadOne = new Runnable() {
12             public void run() {
13                 try {
14                     Thread.sleep(1000);
15                 } catch (InterruptedException e) {
16                     e.printStackTrace();
17                 }
18                 System.out.println("thread one doing something...");
19             }
20         };
21 
22         Runnable threadTwo = new Thread() {
23             public void run() {
24                 try {
25                     Thread.sleep(2000);
26                 } catch (InterruptedException e) {
27                     e.printStackTrace();
28                 }
29                 System.out.println("thread two doing something...");
30             }
31         };
32 
33         threadOne.run();
34         threadTwo.run();
35     }
36 }

1 thread one doing something...  
2 thread two doing something...  
3   
4 shutdownHook one...