addShutdownHook的實現

Question

在哪裏以及如何在一個類中實現addShutdownHook，它沒有主要的方法？這可以用來殺死所有由該類初始化的活動套接字嗎？

Answer 1

這可能爲你工作，

public class AddShutdownHookSample { 
     public void attachShutDownHook(){ 
      Runtime.getRuntime().addShutdownHook(new Thread() { 
       @Override 
       public void run() { 
         System.out.println("Inside Add Shutdown Hook"); 
       } 
      }); 

      System.out.println("Shut Down Hook Attached."); 
     } 
    } 

而且在主要方法：

public static void main(String[] args) { 
    AddShutdownHookSample sample = new AddShutdownHookSample(); 
    sample.attachShutDownHook(); 
    System.out.println("Last instruction of Program...."); 
    System.exit(0); 
} 

描述你正在嘗試做的，並顯示在您擁有的是非常精確的點整件事麻煩這會讓其他人更容易幫助你。

Answer 2

下面是一個例子，這可以幫助你

public class RuntimeDemo { 

    // a class that extends thread that is to be called when program is exiting 
static class Message extends Thread { 

    public void run() { 
    System.out.println("Bye."); 
    } 
} 

public static void main(String[] args) { 
    try { 

    // register Message as shutdown hook 
    Runtime.getRuntime().addShutdownHook(new Message()); 

    // print the state of the program 
    System.out.println("Program is starting..."); 

    // cause thread to sleep for 3 seconds 
    System.out.println("Waiting for 3 seconds..."); 
    Thread.sleep(3000); 

    // print that the program is closing 
    System.out.println("Program is closing..."); 


    } catch (Exception e) { 
    e.printStackTrace(); 
    } 
} 
} 

Answer 3

就像這樣......

static { 
     Runtime.getRuntime().addShutdownHook (new Thread() { 
       public void run() { 
        server.shutdown(); 
       } 
      }); 
    }