代碼如下

package com.util;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.GridLayout;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Observable;import javax.swing.JLabel;import javax.swing.JPanel;/* * 進圖游戲的主界面面板 */public class MainPanel extends JPanel {        PRivate static final long serialVersionUID = 1L;                private MyButton startButton;        private MyButton exitButton;        private JLabel helpLabel;        private JLabel helpLabel1;        private JLabel helpLabel2;        private JLabel helpLabel3;        private Image    image;        private JLabel  centerlabel;        private boolean isStart;        private boolean isExit;        private Observable obs;        public MainPanel(Observable ob)        {                 obs = ob;                                startButton = new MyButton("進入游戲");                exitButton  = new MyButton("退出游戲");                helpLabel  = new JLabel();                helpLabel1  = new JLabel();                helpLabel2  = new JLabel();                helpLabel3  = new JLabel();                centerlabel =  new JLabel();                            this.setLayout(new BorderLayout());                       this.helpLabel.setPreferredSize(new Dimension(645,291));            this.helpLabel1.setPreferredSize(new Dimension(180,80));            this.helpLabel2.setPreferredSize(new Dimension(215,80));            this.helpLabel3.setPreferredSize(new Dimension(645,80));            this.centerlabel.setPreferredSize(new Dimension(460,80));                        centerlabel.setLayout(new GridLayout(2,1));            centerlabel.add(this.startButton);            centerlabel.add(this.exitButton);                        this.centerlabel.setBackground(new Color(255,255,0));                        this.add(helpLabel,BorderLayout.NORTH);            this.add(helpLabel1,BorderLayout.EAST);            this.add(helpLabel2,BorderLayout.WEST);            this.add(helpLabel3,BorderLayout.SOUTH);            this.add(centerlabel,BorderLayout.CENTER);                                               image = Toolkit.getDefaultToolkit().getImage("imgs/主界面112.png");           // image = new ImageIcon(image).getImage();                      this.startButton.addActionListener(                           new ActionListener()                           {                                   public void actionPerformed(ActionEvent e)                                   {                                           boolean flag = true;                                           MainPanel.this.setIsStart(flag);                                           MainPanel.this.obs.notifyObservers(MainPanel.this);                                   }                           }                           );                      this.exitButton.addActionListener(                           new ActionListener()                           {                                   public void actionPerformed(ActionEvent e)                                   {                                          MainPanel.this.setExit(true);                                   }                           }                           );                }                public void paint(Graphics g)        {                super.paint(g);                                Graphics2D g2 = (Graphics2D) g;                    g2.drawImage(image,0,0, this.getWidth(), this.getHeight(),this);                                super.paintComponents(g);                        }                public boolean getIsStart()        {                return this.isStart;        }                public void setIsStart(boolean isStart)        {                this.isStart = isStart;        }                public boolean isExit() {                return isExit;        }        public void setExit(boolean isExit) {                this.isExit = isExit;        }                }

效果圖

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