取得時間用

java.util.Calendar或者java.util.Date

在控制元件上控制時間用

javax.swing.Timer

下面給個例子：

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Calendar;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.Timer;

public class ClockTest extends JFrame {

public ClockTest() {

super("Timer Demo");

setSize(300, 100);

setDefaultCloseOperation(EXIT_ON_CLOSE);

ClockLabel clock = new ClockLabel();

getContentPane().add(clock, BorderLayout.NORTH);

}

public static void main(String args[]) {

ClockTest ct = new ClockTest();

ct.setVisible(true);

}

}

class ClockLabel extends JLabel implements ActionListener {

public ClockLabel() {

super((Calendar.getInstance().getTime()).toString());

Timer t = new Timer(1000, this);

t.start();

}

public void actionPerformed(ActionEvent ae) {

setText(Calendar.getInstance().getTime().toString());

}

}