Java怎么编写走马灯程序

Java怎么编写走马灯程序代码：

package clock

import java.awt.*

import java.awt.event.*

import javax.swing.*

import java.util.Calendar

import java.util.Date

import java.text.*

public class removingLight extends JFrame {

public removingLight() {

Font font1 = new Font("幼圆", Font.BOLD, 16)

Calendar cal = Calendar.getInstance()

SimpleDateFormat formatter = new SimpleDateFormat(

"EEEE,MMMMdd日，yyyy年 HH:mm:ss")

String mDateTime = formatter.format(cal.getTime())

MovingMessagePanel messagePanel = new MovingMessagePanel(mDateTime)

messagePanel.setFont(font1)

messagePanel.setBackground(Color.BLACK)

messagePanel.setForeground(Color.PINK)

add(messagePanel)

}

public static void main(String[] args) {

removingLight frame = new removingLight()

JLabel label = new JLabel("开始调试时间：5月5日 结束调试时间：5月6日")

label.setBackground(Color.black)

frame.setTitle("软件1班 XXX 3107006757")

frame.setLocationRelativeTo(null)

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

frame.setSize(320, 120)

frame.setVisible(true)

frame.add(label, BorderLayout.SOUTH)

}

static class MovingMessagePanel extends JPanel {

private String message = " "

private int xCoordinate = 0

private int yCoordinate = 40

public MovingMessagePanel(String message) {

this.message = message

Timer timer = new Timer(100, new TimerListener())

timer.start()

}

public void paintComponent(Graphics g) {

super.paintComponent(g)

if (xCoordinate >getWidth()) {

xCoordinate = -100

}

xCoordinate += 5

g.drawString(message, xCoordinate, yCoordinate)

}

class TimerListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

repaint()

}

}

}

}

import java.awt.Color

import java.awt.Dimension

import java.awt.Font

import java.awt.HeadlessException

import java.awt.Point

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import java.awt.event.ComponentAdapter

import java.awt.event.ComponentEvent

 

import javax.swing.JFrame

import javax.swing.JLabel

import javax.swing.JOptionPane

import javax.swing.JViewport

import javax.swing.Timer

 

public class Test84 extends JFrame {

  private Timer timer

  private JLabel view

  private JViewport window

  

  public static void main(String[] args)

  {

    JFrame frm = new Test84("跑马灯")

    frm.setDefaultCloseOperation(EXIT_ON_CLOSE)

    frm.pack()

    frm.setVisible(true)

  }

 

  public Test84(String title) throws HeadlessException

  {

    super(title)

    

    initComponents()

    

    addComponentListener(new ComponentAdapter() {

      public void componentResized(ComponentEvent e)

      {

        anchor = new Point()

        anchor.x = -window.getExtentSize().width

        timer.start()

      }

    })

    

    timer = new Timer(100, new ActionListener() {

      public void actionPerformed(ActionEvent e)

      {

        animate()

      }

    })

    timer.setInitialDelay(0)

  }

 

  private void initComponents()

  {

   String s = JOptionPane.showInputDialog(null, "请输入要实现效果的文字:")

    view = new JLabel(s)

    view.setFont(Font.decode("Dialog-BOLD-36"))

    view.setForeground(Color.BLUE)

    

    window = new JViewport()

    window.setView(view)

    getContentPane().add(window)

  }

  

  Point anchor

  private void animate()

  {

    Dimension extSize = window.getExtentSize()

    Dimension viewSize = view.getPreferredSize()

    anchor.x += 5//设置移动的速度

    window.setViewPosition(anchor)

    if (anchor.x > viewSize.width)

      anchor.x = -extSize.width

  }

}

import java.applet.Applet

import java.awt.Font

import java.awt.FontMetrics

import java.awt.Graphics

import java.awt.Imagepublic class Welcome extends Applet {

int pos = 0

Image graph

int w=0

String str = "热烈欢迎2009届新生入学"

Font f = new Font("黑体", Font.BOLD, 20)

public Welcome(){

FontMetrics fm = getFontMetrics(f)

w = fm.stringWidth(str)

pos=w

}

public void paint(Graphics g) {

g.setFont(f)

g.drawString(str, pos-w, 40)

try {

Thread.sleep(100)

} catch (InterruptedException e) {

e.printStackTrace()

}

pos = pos + 5

if (pos-w >getWidth())

pos = w

repaint()

}

}

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