2048小游戏java源代码（通过GUI界面）带注释

很高兴回答您的问题。以下是一个简单的2048小游戏Java源代码，带有注释，通过GUI界面实现：

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class Game2048 extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private JPanel gamePanel; // 游戏界面面板
    private JButton[][] grid; // 游戏面板的格子
    private int[][] values; // 每个格子的值
    private int score; // 当前得分
    private Random random; // 用于生成随机数的随机器

    public Game2048() {
        setTitle("2048 Game");
        setSize(500, 500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        // 初始化游戏面板和格子
        gamePanel = new JPanel(new GridLayout(4, 4));
        grid = new JButton[4][4];
        values = new int[4][4];
        random = new Random();

        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                grid[i][j] = new JButton();
                gamePanel.add(grid[i][j]);
                grid[i][j].addActionListener(this);
            }
        }

        // 在随机的两个格子上生成数字
        generateRandomNumber();
        generateRandomNumber();

        // 将游戏面板添加到窗口上
        add(gamePanel);

        setVisible(true);
    }

    // 生成随机数
    private void generateRandomNumber() {
        int i, j;
        do {
            i = random.nextInt(4);
            j = random.nextInt(4);
        } while (values[i][j] != 0);
        values[i][j] = random.nextDouble() < 0.9 ? 2 : 4;
        grid[i][j].setText("" + values[i][j]);
    }

    // 判断游戏是否结束
    private boolean gameOver() {
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                if (values[i][j] == 0)
                    return false;
                if (i > 0 && values[i][j] == values[i - 1][j])
                    return false;
                if (i < 3 && values[i][j] == values[i + 1][j])
                    return false;
                if (j > 0 && values[i][j] == values[i][j - 1])
                    return false;
                if (j < 3 && values[i][j] == values[i][j + 1])
                    return false;
            }
        }
        return true;
    }

    // 处理按钮点击事件
    @Override
    public void actionPerformed(ActionEvent e) {
        // 找到被点击的按钮在数组中的位置
        int row = -1, col = -1;
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                if (e.getSource() == grid[i][j]) {
                    row = i;
                    col = j;
                    break;
                }
            }
        }

        // 合并数字
        boolean merged = false;
        if (row > 0 && values[row - 1][col] == values[row][col]) {
            values[row - 1][col] += values[row][col];
            values[row][col] = 0;
            grid[row - 1][col].setText("" + values[row - 1][col]);
            grid[row][col].setText("");
            score += values[row - 1][col];
            merged = true;
        }
        if (row < 3 && values[row + 1][col] == values[row][col]) {
            values[row + 1][col] += values[row][col];
            values[row][col] = 0;
            grid[row + 1][col].setText("" + values[row + 1][col]);
            grid[row][col].setText("");
            score += values[row + 1][col];
            merged = true;
        }
        if (col > 0 && values[row][col - 1] == values[row][col]) {
            values[row][col - 1] += values[row][col];
            values[row][col] = 0;
            grid[row][col - 1].setText("" + values[row][col - 1]);
            grid[row][col].setText("");
            score += values[row][col - 1];
            merged = true;
        }
        if (col < 3 && values[row][col + 1] == values[row][col]) {
            values[row][col + 1] += values[row][col];
            values[row][col] = 0;
            grid[row][col + 1].setText("" + values[row][col + 1]);
            grid[row][col].setText("");
            score += values[row][col + 1];
            merged = true;
        }

        // 移动数字
        if (!merged && row >= 0 && col >= 0 && row <= 3 && col <= 3
                && values[row][col] != 0) {
            JOptionPane.showMessageDialog(this, "Invalid move!");
        } else {
            generateRandomNumber();
            if (gameOver()) {
                JOptionPane.showMessageDialog(this, "Game over!\nYour score: " + score);
                System.exit(0);
            }
        }
    }

    public static void main(String[] args) {
        new Game2048();
    }

}

希望这个程序对您有所帮助！