import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.text.*;
public class ShutFrame implements ActionListener,KeyListener{
        private JLabel label_1 = null;
        private JLabel label_2= null;
        private JLabel overTime = null;
        private JTextField HH = null;
        private JTextField mm = null;
        private JTextField ss = null;
        private JButton exit = null;
        private JButton hide = null;
        private JButton start = null;
    public ShutFrame(){
        JFrame jf = new JFrame();
         label_1 = new JLabel("请输入时,分,秒！");
         label_2 = new JLabel("距离关机时间还有:");
         overTime = new JLabel("在这里显示时间");
         HH = new JTextField(3);
         mm = new JTextField(3);
         ss = new JTextField(3);
         exit = new JButton("退出");
         hide = new JButton("占位");
         start = new JButton("开始");
         JPanel jp1= new JPanel();
         JPanel jp2= new JPanel();
         JPanel jp3= new JPanel();
         jp1.add(label_1);
         jp1.add(HH);
         jp1.add(mm);
         jp1.add(ss);
         jp2.add(label_2);
         jp2.add(overTime);
         jp3.add(exit);
         jp3.add(hide);
         jp3.add(start);
         jf.setLayout(new GridLayout(3,1));
         jf.add(jp1);
         jf.add(jp2);
         jf.add(jp3);
         jf.setBounds(200,200,250,200);
         hide.addActionListener(this);
         start.addActionListener(this);
         HH.addKeyListener(this);
         mm.addKeyListener(this);
         ss.addKeyListener(this);
         jf.addKeyListener(this);
         jf.setVisible(true);
    }
    public void actionPerformed(ActionEvent e){
        //this.hide();
        if(e.getSource() == start){
            if(!HH.getText().trim().equals("")&&!mm.getText().trim().equals("")&&!ss.getText().trim().equals("")){
            String H = HH.getText();
            String m = mm.getText();
            String s = ss.getText();
            String time = H + ":" + m + ":" + s; 
        while(true){
            try{
                Date d =new Date();
                SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
                String now =    df.format(d);
                long CloseTime = df.parse(time).getTime();
                long NowTime = df.parse(now).getTime();
                long second = (CloseTime - NowTime)/1000;
                System.out.println("shut time is : " + CloseTime);
                    System.out.println("shut time is : " + NowTime);
                System.out.println("away with shut time is : " + second);
                if(second == 0){
                    System.out.println("computer is shut down!");
                    break;    
                }
                    Thread.sleep(1000);
                        }catch(Exception e1){
                    e1.printStackTrace();    
                }
            }
                }else{
                    System.out.println("请输入完整时间");
            }    
        }
    }
    public void keyTyped(KeyEvent e){

    }
    public void keyPressed(KeyEvent e){
    }
    public void keyReleased(KeyEvent e){
        //System.out.println(e.getKeyCode());
    }
    public static void main(String[] args){
        ShutFrame s = new ShutFrame();
    }
}

new Thread(){
    public void run(){
       while(true){
         //.......
       }
    }
}.start();