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首页 > 解决方案 > 我正在尝试在 java 中构建多项选择测试，由于某种原因，我的代码仅适用于两个问题，而不再适用

java - 我正在尝试在 java 中构建多项选择测试，由于某种原因，我的代码仅适用于两个问题，而不再适用

问题描述

这是我测验的代码。

import java.util.*;
    import java.util.List;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    public class Main2 {
        public class Questions {
            String Question;
            String userAns;
            String realAns;
        }
        public static void main(String[] args) {
            JFrame frame = new JFrame ("Screen");
            frame.setSize(2500, 2500);
            frame.setLayout(null);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            JPanel panel = new JPanel();
            frame.getContentPane().add(panel);
            panel.setSize(2500, 2500);
            panel.setLayout(null);  
            //panel.setBackground(Color.red);

            Question[] questions = new Question[2];
            System.out.println(questions.length);
            Question q1 = new Question();
            q1.Question = "1) What is your Name?";
            q1.A ="Bob";
            q1.B="Billy";
            q1.C="Joe";
            q1.D="Jill";
            questions[0] = q1;

            Question q2 = new Question();
            q2.Question = "2) What is your Age?";
            q2.A ="5";
            q2.B="69";
            q2.C="21";
            q2.D="12";
            questions[1] = q2;

            /*
            Question q3 = new Question();
            q3.Question = "3) When Is your Birthday?";
            q3.A = "May";
            q3.B="Jan";
            q3.C="Apr";
            q3.D="Aug";
            questions[2] = q3;
            */
            //When this question is added the code breaks down
            JLabel Question = new JLabel(questions[0].Question);
            Question.setBounds(50, 0, 1500, 50);
            panel.add(Question);
            Question.setFont(new Font(Question.getFont().getName(), Font.PLAIN, 25));
            Question.setVisible(true);

            JLabel incorrectAnswerLabel = new JLabel ("Incorrect Answer! Try Again");
            incorrectAnswerLabel.setBounds(300, 0, 1000, 500);
            panel.add(incorrectAnswerLabel);
            incorrectAnswerLabel.setVisible(false);
            incorrectAnswerLabel.setFont(new Font(incorrectAnswerLabel.getFont().getName(), Font.BOLD, 46));
            incorrectAnswerLabel.setForeground(Color.RED);

            JLabel correctAnswerLabel = new JLabel ("Correct Answer! Good Job");
            correctAnswerLabel.setBounds(300, 0, 1000, 500);
            panel.add(correctAnswerLabel);
            correctAnswerLabel.setVisible(false);
            correctAnswerLabel.setFont(new Font(correctAnswerLabel.getFont().getName(), Font.BOLD, 46));
            correctAnswerLabel.setForeground(Color.GREEN);

            JButton submitButton = new JButton();
            submitButton.setBounds(50, 250, 150, 50);
            submitButton.setText("Submit");
            panel.add(submitButton);
            submitButton.setVisible(true);



            JRadioButton OptionA = new JRadioButton(questions[0].A);
            OptionA.setBounds(50, 50, 100, 50);
            panel.add(OptionA);
            OptionA.setVisible(true);


            JRadioButton OptionB = new JRadioButton(questions[0].B);
            OptionB.setBounds(50, 100, 100, 50);
            panel.add(OptionB);
            OptionB.setVisible(true);

            JRadioButton OptionC = new JRadioButton(questions[0].C);
            OptionC.setBounds(50, 150, 100, 50);
            panel.add(OptionC);
            OptionC.setVisible(true);

            JRadioButton OptionD = new JRadioButton(questions[0].D);
            OptionD.setBounds(50, 200, 100, 50);
            panel.add(OptionD);
            OptionD.setVisible(true);



            ButtonGroup radioGroup = new ButtonGroup();
            radioGroup.add(OptionA);
            radioGroup.add(OptionB);
            radioGroup.add(OptionC);
            radioGroup.add(OptionD);

            for(int i = 0; i < questions.length-1; i++)
            {
                final int count = i;
                submitButton.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e)
                    {
                        if(submitButton.getText().equals("Submit"))
                        {

                            if(OptionA.isSelected()) {
                                submitButton.setText("Next Question");
                                correctAnswerLabel.setVisible(true);

                            }   
                            else 
                                incorrectAnswerLabel.setVisible(true);
                        }
                        else {
                            correctAnswerLabel.setVisible(false);
                            submitButton.setText("Submit");
                            Question q = questions[count+1];
                            Question.setText(q.Question);
                            setAnswers(q.A, q.B, q.C, q.D, OptionA, OptionB, OptionC, OptionD);
                        }
                    }

                });
            }


        }

        static void setAnswers(String A, String B,String C,String D, JRadioButton a, JRadioButton b, JRadioButton c, JRadioButton d)
        {
            List<String> answers = Arrays.asList(A, B,C,D);
            Collections.shuffle(answers);
            a.setText(answers.get(0));
            b.setText(answers.get(1));
            c.setText(answers.get(2));
            d.setText(answers.get(3));
        }

    }

我的代码只有两个问题就可以正常工作。当我添加第三个时，它甚至没有显示问题的文本。我尝试调试它以查看我的代码是否仍在运行。似乎它确实运行。我工作了几个小时，但我徒劳无功，迫切需要帮助。

笔记：

标签： javaswing

解决方案

public class Main2 {

    public class Questions {

        String Question;
        String userAns;
        String realAns;
    }

    static int count = 0;
    public static void main(String[] args) {
        JFrame frame = new JFrame("Screen");
        frame.setSize(2500, 2500);
        frame.setLayout(null);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.getContentPane().add(panel);
        panel.setSize(2500, 2500);
        panel.setLayout(null);
        //panel.setBackground(Color.red);

        Question[] questions = new Question[3];
        System.out.println(questions.length);
        Question q1 = new Question();
        q1.Question = "1) What is your Name?";
        q1.A = "Bob";
        q1.B = "Billy";
        q1.C = "Joe";
        q1.D = "Jill";
        questions[0] = q1;

        Question q2 = new Question();
        q2.Question = "2) What is your Age?";
        q2.A = "5";
        q2.B = "69";
        q2.C = "21";
        q2.D = "12";
        questions[1] = q2;

        Question q3 = new Question();
        q3.Question = "3) When Is your Birthday?";
        q3.A = "May";
        q3.B = "Jan";
        q3.C = "Apr";
        q3.D = "Aug";
        questions[2] = q3;

        //When this question is added the code breaks down
        JLabel Question = new JLabel(questions[0].Question);
        Question.setBounds(50, 0, 1500, 50);
        panel.add(Question);
        Question.setFont(new Font(Question.getFont().getName(), Font.PLAIN, 25));
        Question.setVisible(true);

        JLabel incorrectAnswerLabel = new JLabel("Incorrect Answer! Try Again");
        incorrectAnswerLabel.setBounds(300, 0, 1000, 500);
        panel.add(incorrectAnswerLabel);
        incorrectAnswerLabel.setVisible(false);
        incorrectAnswerLabel.setFont(new Font(incorrectAnswerLabel.getFont().getName(), Font.BOLD, 46));
        incorrectAnswerLabel.setForeground(Color.RED);

        JLabel correctAnswerLabel = new JLabel("Correct Answer! Good Job");
        correctAnswerLabel.setBounds(300, 0, 1000, 500);
        panel.add(correctAnswerLabel);
        correctAnswerLabel.setVisible(false);
        correctAnswerLabel.setFont(new Font(correctAnswerLabel.getFont().getName(), Font.BOLD, 46));
        correctAnswerLabel.setForeground(Color.GREEN);

        JButton submitButton = new JButton();
        submitButton.setBounds(50, 250, 150, 50);
        submitButton.setText("Submit");
        panel.add(submitButton);
        submitButton.setVisible(true);

        JRadioButton OptionA = new JRadioButton(questions[0].A);
        OptionA.setBounds(50, 50, 100, 50);
        panel.add(OptionA);
        OptionA.setVisible(true);

        JRadioButton OptionB = new JRadioButton(questions[0].B);
        OptionB.setBounds(50, 100, 100, 50);
        panel.add(OptionB);
        OptionB.setVisible(true);

        JRadioButton OptionC = new JRadioButton(questions[0].C);
        OptionC.setBounds(50, 150, 100, 50);
        panel.add(OptionC);
        OptionC.setVisible(true);

        JRadioButton OptionD = new JRadioButton(questions[0].D);
        OptionD.setBounds(50, 200, 100, 50);
        panel.add(OptionD);
        OptionD.setVisible(true);

        ButtonGroup radioGroup = new ButtonGroup();
        radioGroup.add(OptionA);
        radioGroup.add(OptionB);
        radioGroup.add(OptionC);
        radioGroup.add(OptionD);

        submitButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (submitButton.getText().equals("Submit")) {

                    if (OptionA.isSelected()) {
                        submitButton.setText("Next Question");
                        correctAnswerLabel.setVisible(true);

                    } else {
                        incorrectAnswerLabel.setVisible(true);
                    }
                } else {
                    correctAnswerLabel.setVisible(false);
                    submitButton.setText("Submit");

                    if(count < questions.length-1){
                        count = count+1;
                    }
                    Question q = questions[count];
                    Question.setText(q.Question);
                    setAnswers(q.A, q.B, q.C, q.D, OptionA, OptionB, OptionC, OptionD);
                }
            }

        });

    }

    static void setAnswers(String A, String B, String C, String D, JRadioButton a, JRadioButton b, JRadioButton c, JRadioButton d) {
        List<String> answers = Arrays.asList(A, B, C, D);
        Collections.shuffle(answers);
        a.setText(answers.get(0));
        b.setText(answers.get(1));
        c.setText(answers.get(2));
        d.setText(answers.get(3));
    }

}

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