Java图形用户界面未知报错求解决

Question

想问问我这个代码就是在窗口中增加组件，但是出现未知错误了，想问问怎么解决，歇歇
卓业要求的图是这个

这是代码：

import javax.swing.*;


class Demo6__4 extends JFrame{
    JLabel lbl1,lbl2,lbl3;//标签
    JFrame jFrame ;
    JCheckBox cb1,cb2,cb3,cb4,cb5;//单选框
    JRadioButton jrb1,jrb2,jrb3,jrb4,jrb5;//单选按钮
    JButton btn1,btn2;
    JTextField txt;

    void Display(){
        jFrame = new JFrame("个人信息调查");
        lbl1 = new JLabel("年龄段：");
        lbl2 = new JLabel("兴趣爱好：");
        lbl3 = new JLabel("调查的结果为：");
        cb1 = new JCheckBox("交友");
        cb2 = new JCheckBox("户外");
        cb3 = new JCheckBox("购物");
        cb4 = new JCheckBox("旅游");
        cb5 = new JCheckBox("其他");
        jrb1 = new JRadioButton("5~15岁");
        jrb2 = new JRadioButton("16~25岁");
        jrb3 = new JRadioButton("26~35岁");
        jrb4 = new JRadioButton("36~45岁");
        jrb5 = new JRadioButton("46~55岁");
        btn1 = new JButton("提交");
        btn1 = new JButton("清空");
        txt = new JTextField("");
        jFrame.add(lbl1);
        jFrame.add(jrb1);jFrame.add(jrb2);jFrame.add(jrb3);jFrame.add(jrb4);jFrame.add(jrb5);
        jFrame.add(lbl2);
        jFrame.add(cb1);jFrame.add(cb2);jFrame.add(cb3);jFrame.add(cb4);jFrame.add(cb5);
        jFrame.add(lbl3);
        jFrame.add(txt);
        jFrame.add(btn1);
        jFrame.add(btn2);
        add(jFrame);



        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(500,500);
        setResizable(true);
        setVisible(true);
    }

}
public class Demo6_4 {
    public static void main(String[] args) {
        new Demo6__4().Display();
    }
}

顺便想问问我这个代码有没有可以简洁的写法

Answer 1

我大概把你代码重构了一下，你可以作为参考

使用了更加常见的命名规范，将类名改为了“SurveyForm”，将 GUI 组件的变量名改为了小驼峰式命名法。同时，将原来的 Display() 方法分成了两个方法 initComponents() 和 setupLayout()，将 GUI 组件的创建和布局分别放置在这两个方法中，使得代码更加模块化和易读。此外，将 ButtonGroup 用来组合 JRadioButton 组件，将组件放置在不同的 JPanel 容器中，使用 BoxLayout 使得它们垂直排列，最后将这些容器放置在一个主容器中。这样，代码的结构更加清晰，易于维护。

import javax.swing.*;
 
public class SurveyForm extends JFrame {
    private JLabel ageLabel, interestLabel, resultLabel;
    private JCheckBox friendCheckbox, outdoorCheckbox, shoppingCheckbox, travelCheckbox, otherCheckbox;
    private JRadioButton ageGroup1, ageGroup2, ageGroup3, ageGroup4, ageGroup5;
    private JButton submitButton, clearButton;
    private JTextField resultTextField;
 
    public SurveyForm() {
        super("个人信息调查");
        initComponents();
        setupLayout();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(500,500);
        setResizable(true);
        setVisible(true);
    }
    
    private void initComponents() {
        ageLabel = new JLabel("年龄段：");
        interestLabel = new JLabel("兴趣爱好：");
        resultLabel = new JLabel("调查的结果为：");
        friendCheckbox = new JCheckBox("交友");
        outdoorCheckbox = new JCheckBox("户外");
        shoppingCheckbox = new JCheckBox("购物");
        travelCheckbox = new JCheckBox("旅游");
        otherCheckbox = new JCheckBox("其他");
        ageGroup1 = new JRadioButton("5~15岁");
        ageGroup2 = new JRadioButton("16~25岁");
        ageGroup3 = new JRadioButton("26~35岁");
        ageGroup4 = new JRadioButton("36~45岁");
        ageGroup5 = new JRadioButton("46~55岁");
        submitButton = new JButton("提交");
        clearButton = new JButton("清空");
        resultTextField = new JTextField();
    }
    
    private void setupLayout() {
        ButtonGroup ageGroup = new ButtonGroup();
        ageGroup.add(ageGroup1);
        ageGroup.add(ageGroup2);
        ageGroup.add(ageGroup3);
        ageGroup.add(ageGroup4);
        ageGroup.add(ageGroup5);
        
        JPanel agePanel = new JPanel();
        agePanel.add(ageLabel);
        agePanel.add(ageGroup1);
        agePanel.add(ageGroup2);
        agePanel.add(ageGroup3);
        agePanel.add(ageGroup4);
        agePanel.add(ageGroup5);
        
        JPanel interestPanel = new JPanel();
        interestPanel.add(interestLabel);
        interestPanel.add(friendCheckbox);
        interestPanel.add(outdoorCheckbox);
        interestPanel.add(shoppingCheckbox);
        interestPanel.add(travelCheckbox);
        interestPanel.add(otherCheckbox);
        
        JPanel resultPanel = new JPanel();
        resultPanel.add(resultLabel);
        resultPanel.add(resultTextField);
        
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(submitButton);
        buttonPanel.add(clearButton);
        
        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
       mainPanel.add(agePanel);
        mainPanel.add(interestPanel);
        mainPanel.add(resultPanel);
        mainPanel.add(buttonPanel);
        
        add(mainPanel);
    }
 
    public static void main(String[] args) {
        new SurveyForm();
    }
}