如何打代码在java中在四则运算part1的基础上，增加登陆模块（至少需要2个用户，可以不实现注册功能），和记录具体某位用户的四则运算历史得分（需要有序号，第几次，得分时间），需要进行持久化存储（IO文件存储，或者数据库存储）

好的，以下是Java代码的实现：

首先是用户类：

public class User {
    private String username;
    private String password;
    
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
    
    public String getUsername() {
        return username;
    }
    
    public String getPassword() {
        return password;
    }
}

接下来是四则运算类：

import java.util.Random;

public class Arithmetic {
    private static final int MAX_NUM = 100; // 题目数值的最大值
    private static final int MAX_OPERATOR = 4; // 运算符的数量
    private static final String[] OPERATORS = {"+", "-", "*", "/"}; // 运算符数组
    
    private int num1;
    private int num2;
    private String operator;
    private int answer;
    
    public Arithmetic() {
        Random random = new Random();
        num1 = random.nextInt(MAX_NUM) + 1;
        num2 = random.nextInt(MAX_NUM) + 1;
        operator = OPERATORS[random.nextInt(MAX_OPERATOR)];
        answer = calculate();
    }
    
    private int calculate() {
        switch (operator) {
            case "+":
                return num1 + num2;
            case "-":
                return num1 - num2;
            case "*":
                return num1 * num2;
            case "/":
                return num1 / num2;
            default:
                return 0;
        }
    }
    
    public String getQuestion() {
        return num1 + " " + operator + " " + num2 + " = ?";
    }
    
    public boolean checkAnswer(int userAnswer) {
        return answer == userAnswer;
    }
    
    public int getAnswer() {
        return answer;
    }
}

然后是历史记录类：

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Record {
    private List<Integer> scores;
    
    public Record() {
        scores = new ArrayList<>();
    }
    
    public void addScore(int score) {
        scores.add(score);
    }
    
    public void printScores() {
        System.out.println("历史记录：");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for (int i = 0; i < scores.size(); i++) {
            System.out.println("第" + (i+1) + "次：" + scores.get(i) + "分\t" + sdf.format(new Date()));
        }
    }
}

接下来是数据库类：

import java.sql.*;

public class Database {
    private static final String URL = "jdbc:mysql://localhost:3306/arithmetic";
    private static final String USER = "root";
    private static final String PASSWORD = "123456";
    private Connection conn;
    
    public Database() {
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection(URL, USER, PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
    }
    
    public boolean login(String username, String password) {
        try {
            String sql = "select * from user where username = ? and password = ?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, username);
            ps.setString(2, password);
            ResultSet rs = ps.executeQuery();
            return rs.next();
        } catch (SQLException e) {
            e.printStackTrace();
            return false;
        }
    }
    
    public Record getRecord(String username) {
        try {
            String sql = "select score from record where username = ?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, username);
            ResultSet rs = ps.executeQuery();
            Record record = new Record();
            while (rs.next()) {
                record.addScore(rs.getInt("score"));
            }
            return record;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public void addRecord(String username, int score) {
        try {
            String sql = "insert into record(username, score) values(?, ?)";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, username);
            ps.setInt(2, score);
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

最后是主程序类：

import java.util.Scanner;

public class Main {
    private static final int MAX_QUESTION = 10; // 最大题目数
    private static final int PASS_SCORE = 60; // 及格分数
    
    private static User currentUser;
    private static Record record;
    private static Database database = new Database();
    
    public static void main(String[] args) {
        System.out.println("欢迎使用四则运算程序！");
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入用户名：");
            String username = scanner.next();
            System.out.println("请输入密码：");
            String password = scanner.next();
            if (database.login(username, password)) {
                System.out.println("登录成功！");
                currentUser = new User(username, password);
                record = database.getRecord(username);
                break;
            } else {
                System.out.println("用户名或密码错误，请重新输入！");
            }
        }
        System.out.println("请选择难度：1.简单（数字范围1~10） 2.中等（数字范围1~100） 3.困难（数字范围1~1000）");
        int level = scanner.nextInt();
        int score = 0;
        Arithmetic[] questions = generateQuestions(level);
        for (int i = 0; i < questions.length; i++) {
            System.out.println("第" + (i+1) + "题：" + questions[i].getQuestion());
            int userAnswer = scanner.nextInt();
            if (questions[i].checkAnswer(userAnswer)) {
                System.out.println("回答正确！");
                score += 10;
            } else {
                System.out.println("回答错误！");
            }
        }
        System.out.println("本次得分：" + score);
        record.addScore(score);
        if (score >= PASS_SCORE) {
            System.out.println("恭喜您，本次测试通过！");
        } else {
            System.out.println("很遗憾，本次测试未通过！");
        }
        database.addRecord(currentUser.getUsername(), score);
        record.printScores();
    }
    
    private static Arithmetic[] generateQuestions(int level) {
        Arithmetic[] questions = new Arithmetic[MAX_QUESTION];
        for (int i = 0; i < MAX_QUESTION; i++) {
            questions[i] = new Arithmetic();
        }
        return questions;
    }
}

以上代码是基于Java语言实现的四则运算程序，包含了登录模块和历史记录功能，并且使用了数据库来进行数据存储和读取操作。其中，用户类用于保存用户信息，四则运算类用于生成题目、计算答案和判断答案是否正确等操作，历史记录类用于保存每次用户的四则运算得分记录，数据库类用于连接数据库并进行数据存储和读取操作，主程序类用于实现用户登录、四则运算、历史记录等功能。