运用java语言，给出程序代码，实现设计一款四则运算的自测软件 要求：1.训练题型包括填写结果、对错判断、选择题等。 2.每次训练时，用户先进行选择，包括难度（如 10 以内、100 以内、1000 以内，带负数、带小数、运算数个数、是否允许带括号等）、题型（填写结果、 对错判断、选择题）、题量（各类题目的个数）等，根据用户的选择，自动生成 试题（10 道题目为一组）。 3.用户在软件系统中答题，并提交。

以下是一个简单的四则运算自测软件的Java代码，实现了题型选择、难度选择、题目数量选择、计算答案、判断答案等功能。代码仅供参考，需要根据具体需求进行修改和完善。

import java.util.Scanner;
import java.util.Random;

public class ArithmeticTest {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Random rand = new Random();
        int num1, num2, num3, num4, ans, ans_user, correct_num = 0, total_num = 0;
        String operator1, operator2, operator3;
        boolean isCorrect;

        while (true) {
            System.out.println("请选择难度（1-5）：");
            int level = sc.nextInt();
            System.out.println("请选择题目类型（1-填写结果，2-对错判断，3-选择题）：");
            int type = sc.nextInt();
            System.out.println("请选择题目数量（1-10）：");
            int count = sc.nextInt();

            for (int i = 0; i < count; i++) {
                total_num++;
                num1 = rand.nextInt((int) Math.pow(10, level)) + 1;
                num2 = rand.nextInt((int) Math.pow(10, level)) + 1;
                num3 = rand.nextInt((int) Math.pow(10, level)) + 1;
                num4 = rand.nextInt((int) Math.pow(10, level)) + 1;
                operator1 = generateOperator();
                operator2 = generateOperator();
                operator3 = generateOperator();

                String question = num1 + operator1 + "(" + num2 + operator2 + num3 + ")" + operator3 + num4 + " = ";
                switch (type) {
                    case 1:
                        ans = calculate(num1, num2, num3, num4, operator1, operator2, operator3);
                        System.out.print(question);
                        ans_user = sc.nextInt();
                        isCorrect = checkAnswer(ans, ans_user);
                        break;
                    case 2:
                        ans = calculate(num1, num2, num3, num4, operator1, operator2, operator3);
                        System.out.print(question);
                        String answer_str = sc.next();
                        isCorrect = checkAnswer(ans, answer_str);
                        break;
                    case 3:
                        String[] options = generateOptions(num1, num2, num3, num4, operator1, operator2, operator3, level);
                        ans = calculate(num1, num2, num3, num4, operator1, operator2, operator3);
                        System.out.print(question);
                        for (int j = 0; j < options.length; j++) {
                            System.out.print((j + 1) + "." + options[j] + " ");
                        }
                        int choice = sc.nextInt();
                        isCorrect = checkAnswer(ans, options[choice - 1]);
                        break;
                    default:
                        System.out.println("题目类型选择错误！");
                        continue;
                }
                if (isCorrect) {
                    System.out.println("回答正确！");
                    correct_num++;
                } else {
                    System.out.println("回答错误！");
                }
            }

            System.out.println("本次测试完成，共" + total_num + "道题，正确" + correct_num + "道，错误" + (total_num - correct_num) + "道。");
            System.out.println("是否继续测试？（Y/N）");
            String choice = sc.next();
            if (!choice.equalsIgnoreCase("y")) {
                break;
            }
        }

        System.out.println("程序结束。");
    }

    public static String generateOperator() {
        String[] operators = {"+", "-", "*", "/"};
        Random rand = new Random();
        return operators[rand.nextInt(operators.length)];
    }

    public static int calculate(int num1, int num2, int num3, int num4, String operator1, String operator2, String operator3) {
        int ans1, ans2, ans3;
        ans1 = operate(num1, num2, operator1);
        ans2 = operate(ans1, num3, operator2);
        ans3 = operate(ans2, num4, operator3);
        return ans3;
    }

    public static int operate(int num1, int num2, String operator) {
        int ans = 0;
        switch (operator) {
            case "+":
                ans = num1 + num2;
                break;
            case "-":
                ans = num1 - num2;
                break;
            case "*":
                ans = num1 * num2;
                break;
            case "/":
                ans = num1 / num2;
                break;
            default:
                System.out.println("运算符错误！");
                break;
        }
        return ans;
    }

    public static String[] generateOptions(int num1, int num2, int num3, int num4, String operator1, String operator2, String operator3, int level) {
        String[] options = new String[4];
        Random rand = new Random();
        int ans = calculate(num1, num2, num3, num4, operator1, operator2, operator3);
        int error1, error2, error3;
        do {
            error1 = rand.nextInt(2 * (int) Math.pow(10, level)) - (int) Math.pow(10, level);
        } while (error1 == ans);
        do {
            error2 = rand.nextInt(2 * (int) Math.pow(10, level)) - (int) Math.pow(10, level);
        } while (error2 == ans || error2 == error1);
        do {
            error3 = rand.nextInt(2 * (int) Math.pow(10, level)) - (int) Math.pow(10, level);
        } while (error3 == ans || error3 == error1 || error3 == error2);
        options[rand.nextInt(4)] = String.valueOf(ans);
        options[rand.nextInt(4)] = String.valueOf(error1);
        options[rand.nextInt(4)] = String.valueOf(error2);
        options[rand.nextInt(4)] = String.valueOf(error3);
        return options;
    }

    public static boolean checkAnswer(int ans, int ans_user) {
        return ans == ans_user;
    }

    public static boolean checkAnswer(int ans, String answer_str) {
        if (answer_str.equalsIgnoreCase("true") || answer_str.equalsIgnoreCase("false")) {
            return ans == (answer_str.equalsIgnoreCase("true") ? 1 : 0);
        } else {
            return ans == Integer.parseInt(answer_str);
        }
    }
}