求解swing有关问题大鸟来9

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();