初学者的实例
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Snake extends JFrame {
private JPanel contentPane; //窗体内容网格
private JButton btnStart = new JButton("开始"); //游戏开始按钮
private JButton btnPause = new JButton("暂停"); //游戏暂停按钮
private JButton btnExit = new JButton("退出"); //游戏退出按
private JPanel pnlTop = new JPanel(); //顶部按钮和分数面板