java定时关机(Copy Code)

import java.util.Scanner;class Timeing implements Runnable{    int i = 0;    public Timeing (int i)    {        this.i = i;    }    @Override    public void run ()    {        try        {            Thread.sleep(i * 60 * 1000);            System.out.print("将要关机！");            Program.exec("S");        }        catch (Exception e)        {            e.printStackTrace();        }    }}public class Program{    /**     * @param args     * @throws InterruptedException     */    public static void main (String [] args) throws InterruptedException    {        int i = 0;        while (true)        {            System.out.println("1.定时关机 2.立即关机 3.重启 4.退出");            Scanner scanner = new Scanner(System.in);            try            {                i = scanner.nextInt();                switch (i)                {                    case 1:                        timing();                        break;                    case 2:                        close();                        break;                    case 3:                        restart();                        break;                    case 4:                        System.exit(0);                        break;                    default:                        System.out.println("输入有误，有效数字：1-2-3-4");                        continue;                }                break;            }            catch (Exception e)            {                System.out.println("输入有误！请重新输入!");                continue;            }        }    }    private static void timing () throws InterruptedException    {        System.out.println("倒计时   几分钟？");        Scanner scanner= new Scanner(System.in);        int i;        while(true)        {            try            {                i = scanner.nextInt();                break;            }            catch (Exception e)            {                System.out.println("输入合法数字");                continue;            }        }                Thread thread = new Thread(new Timeing(i));        thread.start();        time(i);    }    private static void time (int i) throws InterruptedException    {        System.out.println("开始计时：");        i = i * 60;        while (true)        {            Thread.sleep(1000);            i -= 1;            if (i <= 0)                break;            System.out.println(i + ",");        }    }    private static void close ()    {        exec("S");    }    private static void restart ()    {        exec("R");    }    public static void exec (String kind)    {        try        {            Runtime.getRuntime().exec("cmd /c start call shutdown -" + kind + " -f -t 0");        }        catch (Exception e)        {            e.printStackTrace();        }    }}