结队编程

//主函数入口
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException
                | IllegalAccessException | UnsupportedLookAndFeelException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        new MainFrame();
    }

//主窗口类
public class MainFrame extends JFrame{
    JPanel jpanel=new JPanel();
    MainMenuBar mainMenuBar=new MainMenuBar(this);//菜单
    ButtonLabel generatingItemButton=new ButtonLabel(Param.generatingItem);//生成按钮
    ButtonLabel beginButton=new ButtonLabel(Param.begin);//开始按钮
    TimeProgressBar timeProgressBar=new TimeProgressBar(this);
    JTextArea subjectArea=new JTextArea();//题目框
    JTextArea answerArea=new JTextArea();//答题区
    public ButtonLabel submitButton=new ButtonLabel(Param.submit);//提交按钮
    
    //构造函数
    public MainFrame(){
        init();
        mouseEvent();
        this.setJMenuBar(mainMenuBar);//添加菜单
        this.setTitle(Param.title);
        this.setSize(700,600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置默认关闭窗口方式
        this.setLocationRelativeTo(null);//设置窗体相对居中
        this.setResizable(false);//设置窗口不可调整
        this.setVisible(true);//可视化
    }
    
    //初始化设置
    public void init(){
        this.setLayout(null);//设置空布局
        
        generatingItemButton.setBounds(20, 20, 100, 30);
        this.add(generatingItemButton);
        
        beginButton.setBounds(130, 20, 100, 30);
        this.add(beginButton);
        
        //进度条
        timeProgressBar.setBounds(400, 20, 250, 30);
        this.add(timeProgressBar);
        
        
        subjectArea.setEditable(false);
        //给试题框出现滚动条
        JScrollPane jssubjectArea=new JScrollPane(subjectArea);
        jssubjectArea.setBounds(20, 100, 600, 150);
        this.add(jssubjectArea);
        
        answerArea.setEditable(false);
        //给答题框加设滚动条
        JScrollPane jsanswerArea=new JScrollPane(answerArea);
        jsanswerArea.setBounds(20, 300, 600, 150);
        this.add(jsanswerArea);
        
        
        submitButton.setBounds(300, 480, 100, 30);
        this.add(submitButton);
        
        jpanel.setBounds(0, 0, 700, 1000);
        this.add(jpanel);
        
    }
｝