Question

java题：用Timer类实现滚动字幕。跪求！！！！

Answer 1

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Demo extends JFrame
{

/**
*
*/
private static final long serialVersionUID = 1L;

public Demo()
{

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)
{

Demo frame = new Demo();
JLabel label = new JLabel("开始调试时间：X月X日 结束调试时间：X月X日");
label.setBackground(Color.black);
frame.setTitle("走马灯");
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 static final long serialVersionUID = 1L;
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();
}
}
}
}