Java pinball game code based on swing

package Game;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.ButtonGroup;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JRadioButtonMenuItem;
/**
 * 游戏界面类
 * 
 * @author Administrator
 * 
 */
public class Game extends javax.swing.JFrame {
        private static final long serialVersionUID = 1L;
        private static Game UI;
        private Graphics g;
        private Listener ml;
        public javax.swing.JLabel text_field;
        public javax.swing.JProgressBar pBar;
        private String command;
        public ArrayList<MyThread> list = new ArrayList<MyThread>();
        private javax.swing.JToggleButton button;
        public static void main(String args[]) {
                UI = new Game();
                UI.initUI();
        }
        /**
         * 初始化窗体的方法
         */
        public void initUI() {
                // 设置标题
                this.setTitle("是高手就坚持10s");
                // 设置大小
                this.setSize(610, 635);
                // 设置关闭是退出程序
                this.setDefaultCloseOperation(3);
                // 设置打开窗体时在屏幕中间显示
                this.setLocationRelativeTo(null);
                // 设置窗体的流式布局管理器
                this.setLayout(new java.awt.FlowLayout());
                // 设置窗体背景颜色
                this.getContentPane().setBackground(java.awt.Color.black);
                // 创建文本标签对象
                text_field = new javax.swing.JLabel();
                javax.swing.JLabel lable = new javax.swing.JLabel("时  间  ：");
                // 设置文本标签前景颜色
                lable.setForeground(java.awt.Color.red);
                text_field.setForeground(java.awt.Color.red);
                // 创建进度条对象
                pBar = new javax.swing.JProgressBar(0, 330);
                // 创建按钮对象
                button = new javax.swing.JToggleButton();
                button.setMargin(new Insets(0, 0, 0, 0));
                button.setIcon(new javax.swing.ImageIcon("images/Pause.gif"));
                button.setActionCommand("暂停");
                // 通过匿名内部类来创建动作监听器
                java.awt.event.ActionListener button_listener = new java.awt.event.ActionListener() {