Question

在Netbeans JFrame窗体中怎么设计倒计时

Answer 1

给你个，在窗体上显示时间的例子。你可以直接运行起来。楼主肯定会的。
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class TimerFrame extends JFrame{
private static final long serialVersionUID = 3974977196233834289L;
private JLabel label=new JLabel();
private SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private Timer timer=new Timer();
public void launchFrame(){
this.setSize(300, 400);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(null);
this.addWindowListener(new WindowAdapter() {

@Override
public void windowClosed(WindowEvent e) {
System.exit(0);
}

});
label.setBounds(140, 180, 200, 10);
this.add(label);
timer.schedule(new TimerFrame.TimeTask(), new Date(), 1000);
this.setVisible(true);
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TimerFrame frame=new TimerFrame();
frame.launchFrame();
}
});
}

class TimeTask extends TimerTask{

@Override
public void run() {
Date date=new Date();
label.setText(format.format(date));
}

}
}
看看有没有什么启示。

Answer 2

都是使用线程来跑的,在线程里作个循环,每个循环sleep(1000),再setText值并repaint窗体就能实现