您的代码充满了问题：
- 不要改写
Jframe.paint()
，尤其是不打电话时super
。设置一个ContentPane并覆盖其paintComponent()
。虽然看起来很方便，但通常这是一个糟糕的设计，并且不必要。 - 不要覆盖
JComponent.paint()
，而是覆盖JComponent.paintComponent()
（并调用super
） - 使用
JLabel
显示图像。这要简单得多。 - 不要混合使用AWT（Canvas）和Swing（Jframe）。坚持摇摆。
这是一个简单的示例，显示Bowser在框架中移动。（这很有趣，当您减小帧大小并使用帧边框打图像时；-)）
import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.net.MalformedURLException;import java.net.URL;import java.util.Random;import javax.swing.ImageIcon;import javax.swing.Jframe;import javax.swing.JLabel;import javax.swing.SwingUtilities;import javax.swing.Timer;import javax.swing.UnsupportedLookAndFeelException;public class TestAnimation2 { private static final int NB_OF_IMAGES_PER_SECOND = 50; private static final int WIDTH = 800; private static final int HEIGHT = 600; private Random random = new Random(); private double dx; private double dy; private double x = WIDTH / 2; private double y = HEIGHT / 2; protected void initUI() throws MalformedURLException { final Jframe frame = new Jframe(TestAnimation2.class.getSimpleName()); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.setLayout(null); final JLabel label = new JLabel(new ImageIcon(new URL("http://www.lemondedemario.fr/images/dossier/bowser/bowser.png"))); label.setSize(label.getPreferredSize()); frame.setMinimumSize(label.getPreferredSize()); frame.add(label); frame.setSize(WIDTH, HEIGHT); dx = getNextSpeed(); dy = getNextSpeed(); Timer t = new Timer(1000 / NB_OF_IMAGES_PER_SECOND, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { x += dx; y += dy; if (x + label.getWidth() > frame.getContentPane().getWidth()) { x = frame.getContentPane().getWidth() - label.getWidth(); dx = -getNextSpeed(); } else if (x < 0) { x = 0; dx = getNextSpeed(); } if (y + label.getHeight() > frame.getContentPane().getHeight()) { y = frame.getContentPane().getHeight() - label.getHeight(); dy = -getNextSpeed(); } else if (y < 0) { y = 0; dy = getNextSpeed(); } label.setLocation((int) x, (int) y); } }); frame.setVisible(true); t.start(); } private double getNextSpeed() { return 2 * Math.PI * (0.5 + random.nextDouble()); } public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { new TestAnimation2().initUI(); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); }}
