Java Swing 启动界面

    import java.awt.Dimension;        import java.awt.Graphics;        import java.awt.Image;        import java.awt.Toolkit;        import java.util.logging.Level;        import java.util.logging.Logger;        import javax.swing.JWindow;        /**        *        * @author Administrator        */        public class WelcomeWindow extends JWindow {            private int duration;            Image ii;            int iconWidth = 800;            int iconHeight = 800;            int liveTime, currTime;            public WelcomeWindow(int duration) {                liveTime = duration / 1000;                ii = this.getToolkit().getImage("IMAGE/LOGO.png");                Dimension welcomeScreen = Toolkit.getDefaultToolkit().getScreenSize();                int x = (welcomeScreen.width - iconWidth) / 2;                int y = (welcomeScreen.height - iconHeight) / 2;                currTime = liveTime;                this.setBounds(x, y, iconHeight, iconHeight);                this.setVisible(true);                this.toFront();            }            public void showWelcomeWindow() {                try {                    repaint();                    Thread.sleep(1000 * liveTime);                } catch (InterruptedException ex) {                    Logger.getLogger(WelcomeWindow.class.getName()).log(Level.SEVERE, null, ex);                }            }            public void showWeclomeWindowAndExit(){                this.showWelcomeWindow();                this.dispose();            }            @Override            public void update(Graphics g){                paint(g);            }            @Override            public void paint(Graphics g){                g.drawImage(ii, 0, 0, this);            }        }