java如何动态显示最新的时间



java如何动态显示最新的时间,java程序显示最新时间的实例源码,实时刷新时间获取当前最新的时间的方法实例介绍:

package nyist.daylight;

import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* This class is a simple JFrame implementation(实现) to explain how to display time
* dynamically(动态的) on the JSwing-based interface.
*/
public class TimeFrame extends JFrame {
/*
* Variables
*/
private JPanel timePanel;
private JLabel timeLabel;
private JLabel displayArea;
private String DEFAULT_TIME_FORMAT = “yyyy-MM-dd hh:mm:ss”;
private String time;
private int ONE_SECOND = 1000;

public TimeFrame() {
timePanel = new JPanel();
timeLabel = new JLabel(“CurrentTime: “);
displayArea = new JLabel();

configTimeArea();


timePanel.add(timeLabel);
timePanel.add(displayArea);
this.add(timePanel);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setSize(new Dimension(200, 80));
this.setLocationRelativeTo(null);
}

/**
* 这个方法创建 a timer task 每秒更新一次 the time
*/
private void configTimeArea() {
Timer tmr = new Timer();
tmr.scheduleAtFixedRate(new JLabelTimerTask(), new Date(), ONE_SECOND);
}

/**
* Timer task 更新时间显示区
*
*/
protected class JLabelTimerTask extends TimerTask {
SimpleDateFormat dateFormatter = new SimpleDateFormat(
DEFAULT_TIME_FORMAT);

@Override
public void run() {
time = dateFormatter.format(Calendar.getInstance().getTime());
displayArea.setText(time);
}
}

public static void main(String arg[]) {
TimeFrame timeFrame = new TimeFrame();
timeFrame.setVisible(true);
}
}