windows定时关机程序

　　/**
　　* Created by IntelliJ IDEA.
　　 * autor:cofbean
　　 * Date: 2004-3-10
 　　* Time: 13:41:48
　　 * QQ:21439991
　　 */

　　import java.io.IOException;

　　public class CtrWDS {

　　    PRivate static CtrWDS ourInstance = null;

　　    private CtrWDS() {
　　    }

 　　   public static CtrWDS getInstance() {
 　　       if (ourInstance == null) {
 　　           ourInstance = new CtrWDS();
  　　      }
 　　       return ourInstance;
  　　  }

    public void exec(String cmd) {
        try {
            Runtime.getRuntime().exec(cmd);
        }
        catch (IOException e) {
            System.out.println("执行失败");       
        }
    }

　public void shutdown() {
        exec("shutdown -S ");
    }

    public void restart() {
        exec("shutdown -R ");
    }

    public void logout() {
        exec("shutdown -L ");
    }

    public static void main(String[] str) {
        if (str.length == 0) {
            System.out.println("-----------------------/n" +
                    "关机  -s/n" +