Java模拟时钟-优快云博客

本文介绍了一个使用Java编写的简易时钟程序。该程序利用Swing库创建了一个图形用户界面，实时显示当前的时间和日期。通过Calendar和SimpleDateFormat类实现日期格式化，并采用Timer类更新时间显示。

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import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Panel; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import javax.swing.JLabel; public class clockPanel extends Panel { Panel p1, p2, p3; JLabel label1; int year, month, day, week; public clockPanel() { setBackground(Color.yellow); setPreferredSize(new Dimension(250, 320)); setLayout(new BorderLayout(10, 10)); /**************************************************************************/ p1 = new Panel(); label1 = new JLabel(); //Calendar c = Calendar.getInstance(); SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日(EE)");//设置日期格式 //System.out.println(df.format(new Date()));// new Date()为获取当前系统时间 //System.out.println(new Date()); //week = c.getTime().getDay(); label1.setText(df.format(new Date())); p1.add(label1); /**************************************************************************/ p2 = new panel2(); /**************************************************************************/ p3 = new panel3(); /**************************************************************************/ this.add(p1, BorderLayout.NORTH); this.add(p2, BorderLayout.CENTER); this.add(p3, BorderLayout.SOUTH); } } import java.awt.Container; import javax.swing.JFrame; public class myClock { /** * @param args */ public static void main(String[] args) { JFrame frame = new JFrame("时钟"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 点击x结束程序 Container contentPane = frame.getContentPane(); // 得到窗口内容面板 contentPane.add(new clockPanel()); frame.pack(); frame.setVisible(true); // 设置窗口可见 } } import java.awt.Font; import java.awt.Graphics; import java.awt.Panel; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.GregorianCalendar; import javax.swing.JLabel; import javax.swing.Timer; public class panel3 extends Panel { Timer timer; private int hour, min, sec; JLabel label2; public panel3() { label2 = new JLabel(); label2.setFont(new Font("SAN_SERIF", Font.BOLD, 20)); add(label2); // setPreferredSize(new Dimension(150,200)); timer = new Timer(1000, new myActionListener()); timer.start(); GregorianCalendar date = new GregorianCalendar(); hour = date.getTime().getHours(); min = date.getTime().getMinutes(); sec = date.getTime().getSeconds(); } public void paint(Graphics g) { super.paint(g); /****************************************************************************/ // 画数字钟 label2.setText(String.format("%1$,02d", hour) + ":" + String.format("%1$,02d", min) + ":" + String.format("%1$,02d", sec)); } public class myActionListener implements ActionListener { @SuppressWarnings("deprecation") public void actionPerformed(ActionEvent e) { if (e.getSource() == timer) { GregorianCalendar date = new GregorianCalendar(); hour = date.getTime().getHours(); min = date.getTime().getMinutes(); sec = date.getTime().getSeconds(); // System.out.println(sec); // degree+=6; // System.out.println(degree); repaint(); } } } } public class ClockCenter { public static int centerX = 120; public static int centerY = 120; } import java.awt.Container; import javax.swing.JFrame; public class myClock { /** * @param args */ public static void main(String[] args) { JFrame frame = new JFrame("时钟"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 点击x结束程序 Container contentPane = frame.getContentPane(); // 得到窗口内容面板 contentPane.add(new clockPanel()); frame.pack(); frame.setVisible(true); // 设置窗口可见 } }