Java语句解疑

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.filechooser.*;
public class MazeWindow extends JFrame implements ActionListener
{
JMenuBar bar;
JMenu menuChoice1,menuChoice2,menuChoice3;
JMenuItem wallImage,roadImage,defaultImage,music,begin,exit,inter,heroList,help,copyright,skin;
JPopupMenu popup1;
MazeWindow()
{
bar=new JMenuBar();
popup1 = new JPopupMenu();
menuChoice1 = new JMenu(" 游戏");
menuChoice2 = new JMenu("选项");
menuChoice3 = new JMenu("帮助");
wallImage = new JMenuItem("墙的图像");
roadImage = new JMenuItem("路的图像");
defaultImage = new JMenuItem("默认的墙和路图像");
skin = new JMenuItem("更换皮肤");
music = new JMenuItem("音乐");
begin = new JMenuItem("开始");
exit = new

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