尝试将生成的算式及习题长期保存下来，建议采用CSV形式存储。提交实现效果及相关代码。

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class MathOperationGenerator {
    public static void main(String[] args) {
        int numberOfQuestions = 10; // 指定生成题目的数量
        List<String> mathQuestions = generateMathQuestions(numberOfQuestions);
        saveToCSV(mathQuestions, "math_questions.csv");

        System.out.println("题目已保存到 math_questions.csv");
    }

    public static List<String> generateMathQuestions(int numQuestions) {
        Random random = new Random();
        List<String> questions = new ArrayList<>();

        for (int i = 0; i < numQuestions; i++) {
            int operand1 = random.nextInt(100);
            int operand2 = random.nextInt(100);
            int operator = random.nextInt(2);

            String operatorSymbol;
            int answer;

            if (operator == 0) {
                operatorSymbol = "+";
                answer = operand1 + operand2;
            } else {
                operatorSymbol = "-";
                answer = operand1 - operand2;
            }

            String question = operand1 + " " + operatorSymbol + " " + operand2 + " = ?";
            questions.add(question);
        }

        return questions;
    }

    public static void saveToCSV(List<String> data, String fileName) {
        try (FileWriter writer = new FileWriter(fileName)) {
            for (String line : data) {
                writer.write(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}