注冊:

Runtime.getRuntime().addShutdownHook(Thread?t);?

注銷:

Runtime.getRuntime().removeShutdownHook(Thread?t);

[例子]
/**
?*?在這個線程中實現程序退出前的清理工作
?*?
?*?@author?Administrator
?*?
?*/
class?TestThread?extends?Thread?{
????boolean?isTerminal?=?false;

????public?void?run()?{
????????while?(!isTerminal)?{
???????????????try?{
??????????????????Thread.sleep(1000);
???????????????}?catch?(InterruptedException?e)?{
??????????????????e.printStackTrace();
???????????????}
????????????System.out.println("run?sub?thread");
????????}
????}

????/**
?????*?清理工作
?????*/
????public?void?onTerminal()?{
????????isTerminal?=?true;
????????System.out.println("stop?sun?sub?thread");
????}
}

/**
?*?ShutdownDownHook測試類
?*?
?*?@author?Administrator
?*?
?*/
public?class?TestShutdownHook?extends?Thread?{
????TestThread?testThread;

????public?void?addThread(TestThread?t)?{
????????testThread?=?t;
????}

????/**
?????*?實現程序退出前的清理工作
?????*/
????public?void?run()?{
????????System.out.println("This?is?ShutdownHook");
????????testThread.onTerminal();
????}

????public?static?void?main(String[]?args)?{
????????TestShutdownHook?m?=?new?TestShutdownHook();
????????TestThread?t?=?new?TestThread();
????????t.start();
????????m.addThread(t);
????????//?注冊退出處理線程
????????Runtime.getRuntime().addShutdownHook(m);
????}
}

運行結果:

run?sub?thread
run?sub?thread
run?sub?thread
run?sub?thread
This?is?ShutdownHook
stop?sun?sub?thread

可以看到:當程序退出時（按Ctrl＋c，但eclipse下不知道如何停止）啟動了TestThread線程，執行了定義的釋放工作。