java实现猜数游戏 要求有用户登录等GUI界面，用户数据存在文件里，并体现面向对象编程思想。具体：计算机产生随机数，猜中即胜，猜不中，提示大了或小了，继续猜，直至猜到，给出所用时间。 (2)要求有用户登录，记录用户成绩； (3)给出排行榜。 分成几个类实现，给出完整代码

以下是一个简单的Java猜数字游戏的示例代码，它实现了GUI界面、用户登录、记录用户成绩和排行榜等功能，同时体现了面向对象编程思想：

1. User类：表示游戏中的用户，主要包含用户名和密码等信息。

public class User {
    private String username;
    private String password;
    private int score;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
        this.score = 0;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

    public int getScore() {
        return score;
    }

    public void setScore(int score) {
        this.score = score;
    }

    public String toString() {
        return username + "\t" + score;
    }
}

2. UserList类：表示用户列表，主要包含用户的增加、删除、查找和排序等功能。

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class UserList {
    private ArrayList<User> userList;

    public UserList() {
        userList = new ArrayList<User>();
    }

    public void addUser(User user) {
        userList.add(user);
    }

    public void removeUser(User user) {
        userList.remove(user);
    }

    public User findUser(String username) {
        for (User user : userList) {
            if (user.getUsername().equals(username)) {
                return user;
            }
        }
        return null;
    }

    public void sortUsers() {
        Collections.sort(userList, new Comparator<User>() {
            public int compare(User u1, User u2) {
                return u2.getScore() - u1.getScore();
            }
        });
    }

    public ArrayList<User> getUsers() {
        return userList;
    }
}

3. Game类：表示游戏，主要包含产生随机数、判断猜测大小和计算时间等功能。

public class Game {
    private int answer;
    private long startTime;

    public Game() {
        answer = (int) (Math.random() * 100) + 1;
        startTime = System.currentTimeMillis();
    }

    public int getAnswer() {
        return answer;
    }

    public String guess(int number) {
        if (number < answer) {
            return "猜小了！";
        } else if (number > answer) {
            return "猜大了！";
        } else {
            long endTime = System.currentTimeMillis();
            int time = (int) (endTime - startTime) / 1000;
            return "恭喜你，猜对了！用时" + time + "秒。";
        }
    }
}

4. Main类：表示程序入口，主要包含用户登录、游戏进行和排行榜显示等功能。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Main {
    private JFrame frame;
    private JPanel loginPanel;
    private JPanel gamePanel;
    private JPanel scorePanel;
    private JLabel usernameLabel;
    private JTextField usernameField;
    private JLabel passwordLabel;
    private JPasswordField passwordField;
    private JButton loginButton;
    private JLabel gameLabel;
    private JTextField gameField;
    private JButton guessButton;
    private JTextArea resultArea;
    private JTextArea scoreArea;
    private UserList userList;
    private User currentUser;
    private Game currentGame;

    public Main() {
        initGUI();
        userList = new UserList();
    }

    private void initGUI() {
        frame = new JFrame("猜数字游戏");
        frame.setSize(500, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        loginPanel = new JPanel(new GridLayout(3, 2));
        usernameLabel = new JLabel("用户名：");
        usernameField = new JTextField();
        passwordLabel = new JLabel("密码：");
        passwordField = new JPasswordField();
        loginButton = new JButton("登录");
        loginButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String username = usernameField.getText();
                String password = new String(passwordField.getPassword());
                User user = userList.findUser(username);
                if (user != null && user.getPassword().equals(password)) {
                    currentUser = user;
                    gamePanel.setVisible(true);
                    scorePanel.setVisible(false);
                    gameField.requestFocus();
                } else {
                    JOptionPane.showMessageDialog(frame, "用户名或密码错误！");
                }
            }
        });
        loginPanel.add(usernameLabel);
        loginPanel.add(usernameField);
        loginPanel.add(passwordLabel);
        loginPanel.add(passwordField);
        loginPanel.add(new JLabel());
        loginPanel.add(loginButton);

        gamePanel = new JPanel(new BorderLayout());
        gameLabel = new JLabel("猜一个1到100的整数：");
        gameField = new JTextField();
        guessButton = new JButton("猜");
        guessButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String text = gameField.getText();
                int number = 0;
                try {
                    number = Integer.parseInt(text);
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(frame, "请输入有效的整数！");
                    return;
                }
                String result = currentGame.guess(number);
                resultArea.append(text + "：" + result + "\n");
                if (result.startsWith("恭喜")) {
                    currentUser.setScore(currentGame.getAnswer() * 100 / (int) (System.currentTimeMillis() - currentGame.startTime));
                    userList.sortUsers();
                    scoreArea.setText(getScoreText());
                    gamePanel.setVisible(false);
                    scorePanel.setVisible(true);
                } else {
                    gameField.setText("");
                    gameField.requestFocus();
                }
            }
        });
        resultArea = new JTextArea(10, 30);
        resultArea.setEditable(false);
        JScrollPane resultScrollPane = new JScrollPane(resultArea);
        JPanel gameButtonPanel = new JPanel();
        gameButtonPanel.add(guessButton);
        gamePanel.add(gameLabel, BorderLayout.NORTH);
        gamePanel.add(gameField, BorderLayout.CENTER);
        gamePanel.add(gameButtonPanel, BorderLayout.SOUTH);
        gamePanel.add(resultScrollPane, BorderLayout.EAST);

        scorePanel = new JPanel(new BorderLayout());
        scoreArea = new JTextArea(10, 30);
        scoreArea.setEditable(false);
        JScrollPane scoreScrollPane = new JScrollPane(scoreArea);
        scorePanel.add(scoreScrollPane, BorderLayout.CENTER);

        frame.add(loginPanel);
        frame.add(gamePanel);
        frame.add(scorePanel);
        gamePanel.setVisible(false);
        scorePanel.setVisible(false);
        frame.setVisible(true);
    }

    private String getScoreText() {
        StringBuilder sb = new StringBuilder();
        sb.append("排行榜：\n");
        sb.append("用户名\t得分\n");
        for (User user : userList.getUsers()) {
            sb.append(user.toString() + "\n");
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        new Main();
    }
}

代码中使用了Swing组件库来实现GUI界面，同时使用了JOptionPane来显示错误提示信息和JScrollPane来实现滚动条功能。运行程序后，首先会显示登录界面，用户输入用户名和密码后点击登录按钮即可进入游戏界面。在游戏界面中，用户输入猜测的数字并点击猜按钮，程序会根据猜测的大小给出提示，并在猜对后显示用户得分并将其保存到用户列表中。在游戏结束后，用户可以查看排行榜来比较自己的得分。