12月20日

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new MathExerciseGenerator();
            }
        });
    }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

public class MathExerciseGenerator extends JFrame {
    private JComboBox<String> operationComboBox;
    private JTextArea exerciseArea, resultArea;
    private JTextField answerField;

    public MathExerciseGenerator() {
        // 设置窗体属性
        setTitle("BYD");
        setSize(600, 500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建组件
        operationComboBox = new JComboBox<>(new String[]{"10以内加法", "10以内减法", "20以内加法", "20以内减法", "100以内加法", "100以内减法","100以内乘法","100以内除法"});
        exerciseArea = new JTextArea(10, 30);
        resultArea = new JTextArea(10, 30);
        resultArea.setEditable(false);
        answerField = new JTextField(20);

        JButton generateButton = new JButton("出题");
        JButton checkButton = new JButton("评卷");
        JButton showAnswerButton = new JButton("答案");
        generateButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                generateExercises();
            }
        });
        checkButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                checkAnswers();
            }
        });
        showAnswerButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                showAnswers();
            }
        });

        // 布局管理
        setLayout(new FlowLayout());

        add(new JLabel("题目类型:"));
        add(operationComboBox);
        add(generateButton);
        add(checkButton);
        add(showAnswerButton);
        add(new JScrollPane(exerciseArea));
        add(new JLabel("你的答案:"));
        add(answerField);
        add(new JScrollPane(resultArea));
        setVisible(true);
    }

    private void generateExercises() {
        String operation = (String) operationComboBox.getSelectedItem();
        StringBuilder exercises = new StringBuilder();

        Random random = new Random();
        int operand1, operand2;
        for (int i = 0; i < 20; i++) {
            switch (operation) {
                case "10以内加法":
                    operand1 = random.nextInt(10)+1;
                    operand2 = random.nextInt(11 - operand1);
                    exercises.append(operand1).append(" + ").append(operand2).append(" =\n");
                    break;
                case "10以内减法":
                    operand1 = random.nextInt(10)+1;
                    operand2 = random.nextInt(operand1 + 1);
                    exercises.append(operand1).append(" - ").append(operand2).append(" =\n");
                    break;
                case "20以内加法":
                    operand1 = random.nextInt(20)+1;
                    operand2 = random.nextInt(21 - operand1);
                    exercises.append(operand1).append(" + ").append(operand2).append(" =\n");
                    break;
                case "20以内减法":
                    operand1 = random.nextInt(20)+1;
                    operand2 = random.nextInt(operand1 + 1);
                    exercises.append(operand1).append(" - ").append(operand2).append(" =\n");
                    break;
                case "100以内加法":
                    operand1 = random.nextInt(100)+1;
                    operand2 = random.nextInt(101 - operand1);
                    exercises.append(operand1).append(" + ").append(operand2).append(" =\n");
                    break;
                case "100以内减法":
                    operand1 = random.nextInt(100)+1;
                    operand2 = random.nextInt(operand1 + 1);
                    exercises.append(operand1).append(" - ").append(operand2).append(" =\n");
                    break;
                case "100以内乘法":
                    operand1 = random.nextInt(100)+1;
                    operand2 = random.nextInt(operand1 + 1);
                    exercises.append(operand1).append(" * ").append(operand2).append(" =\n");
                    break;
                case "100以内除法":
                    operand1 = random.nextInt(100)+1;
                    operand2 = random.nextInt(operand1 + 1);
                    while(operand1%operand2!=0)
                    {
                        operand2 = random.nextInt(operand1 + 1);
                    }
                    exercises.append(operand1).append(" / ").append(operand2).append(" =\n");
                    break;
            }
        }

        exerciseArea.setText(exercises.toString());
        resultArea.setText("");
        answerField.setText("");
    }

    private void checkAnswers() {
        String[] answers = answerField.getText().split(" ");
        String[] exercises = exerciseArea.getText().split("\n");
        StringBuilder results = new StringBuilder();
        System.out.println(answers.length);
        System.out.println(exercises.length);
        if (answers.length != exercises.length) {
            JOptionPane.showMessageDialog(this, "请回答所有题目。", "提示", JOptionPane.INFORMATION_MESSAGE);
            return;
        }

        for (int i = 0; i < exercises.length; i++) {
            String userAnswer = answers[i].trim();
            String[] parts = exercises[i].split("\\s+");
            int operand1 = Integer.parseInt(parts[0]);
            int operand2 = Integer.parseInt(parts[2]);
            int correctAnswer = 0;

            switch (parts[1]) {
                case "+":
                    correctAnswer = operand1 + operand2;
                    break;
                case "-":
                    correctAnswer = operand1 - operand2;
                    break;
                case "*":
                    correctAnswer = operand1 * operand2;
                    break;
                case "/":
                    correctAnswer = operand1 / operand2;
                    break;
            }

            boolean isCorrect = userAnswer.equals(String.valueOf(correctAnswer));
            results.append(isCorrect ? "√" : "╳").append("\n");
        }

        resultArea.setText(results.toString());
    }

    private void showAnswers() {
        String[] exercises = exerciseArea.getText().split("\n");
        StringBuilder answers = new StringBuilder();

        for (String exercise : exercises) {
            String[] parts = exercise.split("\\s+");
            int operand1 = Integer.parseInt(parts[0]);
            int operand2 = Integer.parseInt(parts[2]);
            int correctAnswer = 0;

            switch (parts[1]) {
                case "+":
                    correctAnswer = operand1 + operand2;
                    break;
                case "-":
                    correctAnswer = operand1 - operand2;
                    break;
                case "*":
                    correctAnswer = operand1 * operand2;
                    break;
                case "/":
                    correctAnswer = operand1 / operand2;
                    break;
            }

            answers.append(correctAnswer).append("\n");
        }

        resultArea.setText("答案:\n" + answers.toString());
    }
}