import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Timer extends JFrame
{
Pane1 p1;
Pane2 p2;
Timer()
{

super("日历");
JPanel pan=new JPanel();
pan.setLayout(new GridLayout(2,1,5,5));
p1=new Pane1();p2=new Pane2();
pan.add(p1);
pan.add(p2);
setSize(200,300);
setContentPane(pan);
}
public static void main(String[] args)
{
JFrame tt=new Timer();
tt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tt.setVisible(true);
}
}
class Pane1 extends JPanel
{
private JLabel Mon,Tus,Wen,Thir,Fir,Stat,Sun;
Pane1()
{
Mon=new JLabel("一");
Tus=new JLabel("二");
Wen=new JLabel("三");
Thir=new JLabel("四");
Fir=new JLabel("五");
Stat=new JLabel("六");
Sun=new JLabel("日");
add(Mon);add(Tus);add(Wen);add(Thir);add(Fir);add(Stat); add(Sun);
}
}
class Pane2 extends JPanel implements ActionListener ///就是这个面板不能显示出来.编译和执行都可以.
{
private JLabel showTime;
Pane2()
{
showTime=new JLabel("");
add(showTime);
}
public void actionPerformed(ActionEvent e)
{
try {
Calendar d=Calendar.getInstance();
int hour=d.get(Calendar.HOUR);
int min=d.get(Calendar.MINUTE);
int sec=d.get(Calendar.SECOND);
Thread.sleep(1000);
showTime.setText("现在时间是:"+hour+"时:"+min+"分:"+sec+"秒");
}
catch (Exception ex) {

}
}
}

class Pane2 extends JPanel implements ActionListener  ///就是这个面板不能显示出来.编译和执行都可以.
{
  private JLabel showTime;
  Pane2()
  {
    showTime=new JLabel(\"\");
    add(showTime);
  }
  public void actionPerformed(ActionEvent e)
//你没有在面板中添加监听器,所以这个方法并不会被执行。所以时间显示不出来。
//你要实现显示时间,可以用Timer类来实现，或者直接用线程来做。
  {
    try {
      Calendar d=Calendar.getInstance();
      int hour=d.get(Calendar.HOUR);
      int min=d.get(Calendar.MINUTE);
      int sec=d.get(Calendar.SECOND);
      Thread.sleep(1000);
      showTime.setText(\"现在时间是:\"+hour+\"时:\"+min+\"分:\"+sec+\"秒\");
    }
    catch (Exception ex) {

    }
  }

[此贴子已经被作者于2007-6-12 11:58:29编辑过]

class Pane2 extends JPanel implements Runnable //时间的面板
{
private JLabel showTime;
Pane2()
{
showTime=new JLabel("");
add(showTime);
}
public void run() //更新时间
{
while(true)
{
repaint();
try {
Calendar d = Calendar.getInstance(); //获得当前时间
int hour = d.get(Calendar.HOUR);
int min = d.get(Calendar.MINUTE);
int sec = d.get(Calendar.SECOND);
Thread.sleep(1000);
showTime.setText("现在时间是:" + hour + "时:" + min + "分:" + sec + "秒");
}
catch (InterruptedException ex) {

}
}
}
}

这样行不行?
但它还是不显示.

[此贴子已经被作者于2007-6-12 12:12:09编辑过]

什么意思?????????不懂.上面的方法不行吗?

怎么把背景放一张图片啊?