import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; import java.text.SimpleDateFormat; public class Test { private JFrame f; private ShowTime show; private JButton btn; public Test() { f = new JFrame(); Container c = f.getContentPane(); show = new ShowTime(); c.add(show,"Center"); new Thread(show).start(); f.setSize(400,400); f.setVisible(true); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public static void main(String args[]) { new Test(); }
}class ShowTime extends JPanel implements Runnable,ActionListener { boolean stop = true; JLabel out = null; private Date times = null; private SimpleDateFormat matter = null; JButton btn,btr; public ShowTime() { out = new JLabel(); times = new Date(); btr = new JButton("开始"); btn = new JButton("停止"); add(out); add(btn); add(btr); btn.addActionListener(this); btr.addActionListener(this); matter = new SimpleDateFormat("HH时:mm分:ss秒"); out.setText("现在时间:" +matter.format(times)); }
public void run() { while(true) { while(stop) { times = new Date(); out.setText("现在时间:" +matter.format(times)); try{Thread.sleep(1000);}catch(Exception e){} } } }
public void setStop(boolean b) { this.stop = b;
}
public void actionPerformed(ActionEvent ae) { if(ae.getSource() == btn) setStop(false);
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.text.SimpleDateFormat;
public class Test
{
private JFrame f;
private ShowTime show;
private JButton btn;
public Test()
{
f = new JFrame();
Container c = f.getContentPane();
show = new ShowTime();
c.add(show,"Center");
new Thread(show).start();
f.setSize(400,400);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String args[])
{
new Test();
}
}class ShowTime extends JPanel implements Runnable,ActionListener
{
boolean stop = true;
JLabel out = null;
private Date times = null;
private SimpleDateFormat matter = null;
JButton btn,btr;
public ShowTime()
{
out = new JLabel();
times = new Date();
btr = new JButton("开始");
btn = new JButton("停止");
add(out);
add(btn);
add(btr);
btn.addActionListener(this);
btr.addActionListener(this);
matter = new SimpleDateFormat("HH时:mm分:ss秒");
out.setText("现在时间:" +matter.format(times));
}
public void run()
{
while(true)
{
while(stop)
{
times = new Date();
out.setText("现在时间:" +matter.format(times));
try{Thread.sleep(1000);}catch(Exception e){}
}
}
}
public void setStop(boolean b)
{
this.stop = b;
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource() == btn)
setStop(false);
if(ae.getSource() == btr)
setStop(true);
}
}
乱写了一个,也实现你的要求了,哈哈