学习了Timer类,就按照书上的代码写了个消息在面板上移动的代码,但是现在消息不显示出来?怎么回事嗯?大家帮忙看看~import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;public class AnimationDemo extends JFrame {
public AnimationDemo() {
add(new MovingMessagePanel("message moving"));
}
public static void main(String[] args) {
AnimationDemo frame = new AnimationDemo();
frame.setTitle("AnimationDemo");
frame.setSize(280, 100);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setVisible(true);
}
static class MovingMessagePanel extends JPanel {
public MovingMessagePanel(String message) {
this.message = message;
Timer time = new Timer(1000, new TimerListener());
time.start();
}
protected void paintComponet(Graphics g) {
super.paintComponent(g);
if (x > getWidth()) {
x = -20;
}
x += 5;
g.drawString(message, x, y);
}
class TimerListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
repaint();
}
}
private int x = 0;
private int y = 20;
private String message = "Welcome to Java";
}
}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;public class AnimationDemo extends JFrame {
public AnimationDemo() {
add(new MovingMessagePanel("message moving"));
}
public static void main(String[] args) {
AnimationDemo frame = new AnimationDemo();
frame.setTitle("AnimationDemo");
frame.setSize(280, 100);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setVisible(true);
}
static class MovingMessagePanel extends JPanel {
public MovingMessagePanel(String message) {
this.message = message;
Timer time = new Timer(1000, new TimerListener());
time.start();
}
protected void paintComponet(Graphics g) {
super.paintComponent(g);
if (x > getWidth()) {
x = -20;
}
x += 5;
g.drawString(message, x, y);
}
class TimerListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
repaint();
}
}
private int x = 0;
private int y = 20;
private String message = "Welcome to Java";
}
}
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
super.paint(g); if (x > getWidth()) {
x = -20;
}
x += 5;
g.drawString(message, x, y);
}