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import org.omg.SendingContext.RunTime;public class Main extends Thread{	private volatile boolean isExit = false;	private volatile static boolean isRefresh = false;	private static Main mainserver= null;	public static final Object mainLock = new Object();		public static Main getInstance() {		if( null == mainserver ) {			synchronized(Main.class) {				if( null == mainserver ) {					mainserver = new Main();				}			}		}				return mainserver;	}		public static void main(String[] args) {		// TODO Auto-generated method stub		Main servermain = Main.getInstance();				while(!servermain.isExit) {			synchronized(mainLock) {				System.out.println("Starting server main!!!");				Runtime.getRuntime().addShutdownHook(servermain); /*hook can be registered only once.*/								try {					//System.exit(0);  /*Run this to exit JVM in order to call the hook*/					mainLock.wait();				} catch (InterruptedException e) {					// TODO Auto-generated catch block					e.printStackTrace();				}								/*refresh,set isExit false*/				if(isRefresh) {					isRefresh = false;					servermain.isExit = false;					System.out.println("Restarting main server!");				}								System.out.println("Terminate the main server.After while circle.");			}		}	}	public void run() {		System.out.println("Terminate the main server.");	}}

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