2048的代码不是我写的，是从牛客网的项目平台找到的项目

项目代码链接（代码放在了文章最后）

 https://git.nowcoder.com/11000160/2048-java/blob/master/Game2048.java

录制的效果图：

游戏逻辑分析

2048大家都玩过，我就不介绍了，没玩过了可以去玩儿一下，直接说游戏的逻辑

1.通过上、下、左、右移动，使相邻的相同元素进行合并，进而数字相加得到 2048的结果的游戏。

2.每次生成得到数字块是 2或4 ，生成的位置是在空白位置随机出现。

3.游戏最开始随机出现两个数字块

4.每次传入一个移动方向（上下左右），所有数字块都向该方向移动直到边界，相同两个数字块会合并成两数之和变成一个数字块。

5.若移动后没有一个数字块发生位移则移动无效，不会产生新数字块。

6.当场景没有空位且无法移动则游戏失败。

7.游戏分数为场景内最大的数字，当数字为2048时游戏结束。

代码的分析

感觉代码已经很简洁了 200来行就能写出这个游戏。

简易的思维导图

文字版

Game2048

main主方法

SwingUtilities.invokeLater(() -> {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE可以关闭窗口);

f.setTitle("2048");设置窗口标题

f.setResizable(true);面板可以调节

f.add(new Game2048(), BorderLayout.CENTER);把游戏放入面板

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);可见

});

class Tile数字块类

数字块类

private boolean merged;是否合并

private int value;值

构造方法

• Tile(int val) {

  • value = val;

get 和set方法

• getValue()

• setMerged(boolean m)

canMergeWith(Tile other)判断两个块是否可合并

• return !merged && other != null && !other.merged && value == other.getValue();

• 值相等，另一块不是空，本次移动没有和另一块合并，都可以合并

int mergeWith(Tile other) {合并方法

• if (canMergeWith(other)) {

  • value *= 2;合并值翻倍

  • merged = true;

  • return value;

• return -1;

movesAvailable判断是否可以移动

clearMerged清楚面板

遍历所有格子 设置false

变量

State静态成员

• start, won, running, over游戏状态

colorTable颜色库

• new Color(0x701710), new Color(0xFFE4C3), new Color(0xfff4d3),

• new Color(0xffdac3), new Color(0xe7b08e), new Color(0xe7bf8e),

• new Color(0xffc4c3), new Color(0xE7948e), new Color(0xbe7e56),

• new Color(0xbe5e56), new Color(0x9c3931), new Color(0x701710)};

final static int target = 2048;目标分数

static int highest;游戏高度

static int score;游戏分数

private Color gridColor = new Color(0xBBADA0);方格颜色

private Color emptyColor = new Color(0xCDC1B4);空颜色

private Color startColor = new Color(0xFFEBCD);开始颜色

private Random rand = new Random();随机数

private Tile tiles;数字块数组 存放全部数字块

private int side = 4;格子大小4*4

private State gamestate = State.start;游戏状态

private boolean checkingAvailableMoves;可否移动状态

Game2048构造方法

setPreferredSize(new Dimension(900, 700));

setBackground(new Color(0xFAF8EF));

setFont(new Font("SansSerif", Font.BOLD, 48));

setFocusable(true);

监听鼠标

监听键盘

paintComponent绘制组件

初始化画图

setRenderingHint抗锯齿

startGame开始游戏

if (gamestate != State.running) {

score = 0;

highest = 0;

gamestate = State.running;

tiles = new Tileside;

addRandomTile();

addRandomTile();

}

drawGrid绘制面板

g.setColor(gridColor);设置颜色

g.fillRoundRect(200, 100, 499, 499, 15, 15);填充背景

判断游戏状态

drawTile绘制数字块

fillRoundRect在二维面板 r行c列画value

addRandomTile随机生成数字块

随机找空位置添加 4或2

move移动数字块

根据方向进行移动

移动后序处理

• if (moved) {

• if (highest < target) {

• clearMerged();

• addRandomTile();

• if (!movesAvailable()) {

• gamestate = State.over;

• }

• } else if (highest == target)

• gamestate = State.won;

• }

一系列移动方法

boolean moveUp() {

• return move(0, -1, 0);

boolean moveDown() {

• return move(side * side - 1, 1, 0);

boolean moveLeft() {

• return move(0, 0, -1);

boolean moveRight() {

• return move(side * side - 1, 0, 1);

代码

package com.hanxu51.game2048;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
public class Game2048 extends JPanel {
    enum State {
        start, won, running, over
    }
    final Color[] colorTable = {
            new Color(0x701710), new Color(0xFFE4C3), new Color(0xfff4d3),
            new Color(0xffdac3), new Color(0xe7b08e), new Color(0xe7bf8e),
            new Color(0xffc4c3), new Color(0xE7948e), new Color(0xbe7e56),
            new Color(0xbe5e56), new Color(0x9c3931), new Color(0x701710)};
    final static int target = 2048;
    static int highest;
    static int score;
    private Color gridColor = new Color(0xBBADA0);
    private Color emptyColor = new Color(0xCDC1B4);
    private Color startColor = new Color(0xFFEBCD);
    private Random rand = new Random();
    private Tile[][] tiles;
    private int side = 4;
    private State gamestate = State.start;
    private boolean checkingAvailableMoves;
    public Game2048() {
        setPreferredSize(new Dimension(900, 700));
        setBackground(new Color(0xFAF8EF));
        setFont(new Font("SansSerif", Font.BOLD, 48));
        setFocusable(true);
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                startGame();
                repaint();
            }
        });
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                switch (e.getKeyCode()) {
                    case KeyEvent.VK_UP:
                        moveUp();
                        break;
                    case KeyEvent.VK_DOWN:
                        moveDown();
                        break;
                    case KeyEvent.VK_LEFT:
                        moveLeft();
                        break;
                    case KeyEvent.VK_RIGHT:
                        moveRight();
                        break;
                }
                repaint();
            }
        });
    }
    @Override
    public void paintComponent(Graphics gg) {
        super.paintComponent(gg);
        Graphics2D g = (Graphics2D) gg;
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        drawGrid(g);
    }
    void startGame() {
        if (gamestate != State.running) {
            score = 0;
            highest = 0;
            gamestate = State.running;
            tiles = new Tile[side][side];
            addRandomTile();
            addRandomTile();
        }
    }
    void drawGrid(Graphics2D g) {
        g.setColor(gridColor);
        g.fillRoundRect(200, 100, 499, 499, 15, 15);
        if (gamestate == State.running) {
            for (int r = 0; r < side; r++) {
                for (int c = 0; c < side; c++) {
                    if (tiles[r][c] == null) {
                        g.setColor(emptyColor);
                        g.fillRoundRect(215 + c * 121, 115 + r * 121, 106, 106, 7, 7);
                    } else {
                        drawTile(g, r, c);
                    }
                }
            }
        } else {
            g.setColor(startColor);
            g.fillRoundRect(215, 115, 469, 469, 7, 7);
            g.setColor(gridColor.darker());
            g.setFont(new Font("SansSerif", Font.BOLD, 128));
            g.drawString("2048", 310, 270);
            g.setFont(new Font("SansSerif", Font.BOLD, 20));
            if (gamestate == State.won) {
                g.drawString("you made it!", 390, 350);
            } else if (gamestate == State.over)
                g.drawString("game over", 400, 350);
            g.setColor(gridColor);
            g.drawString("click to start a new game", 330, 470);
            g.drawString("(use arrow keys to move tiles)", 310, 530);
        }
    }
    void drawTile(Graphics2D g, int r, int c) {
        int value = tiles[r][c].getValue();
        g.setColor(colorTable[(int) (Math.log(value) / Math.log(2)) + 1]);
        g.fillRoundRect(215 + c * 121, 115 + r * 121, 106, 106, 7, 7);
        String s = String.valueOf(value);
        g.setColor(value < 128 ? colorTable[0] : colorTable[1]);
        FontMetrics fm = g.getFontMetrics();
        int asc = fm.getAscent();
        int dec = fm.getDescent();
        int x = 215 + c * 121 + (106 - fm.stringWidth(s)) / 2;
        int y = 115 + r * 121 + (asc + (106 - (asc + dec)) / 2);
        g.drawString(s, x, y);
    }
    private void addRandomTile() {
        int pos = rand.nextInt(side * side);
        int row, col;
        do {
            pos = (pos + 1) % (side * side);
            row = pos / side;
            col = pos % side;
        } while (tiles[row][col] != null);
        int val = rand.nextInt(10) == 0 ? 4 : 2;
        tiles[row][col] = new Tile(val);
    }
    private boolean move(int countDownFrom, int yIncr, int xIncr) {
        boolean moved = false;
        for (int i = 0; i < side * side; i++) {
            int j = Math.abs(countDownFrom - i);
            int r = j / side;
            int c = j % side;
            if (tiles[r][c] == null)
                continue;
            int nextR = r + yIncr;
            int nextC = c + xIncr;
            while (nextR >= 0 && nextR < side && nextC >= 0 && nextC < side) {
                Tile next = tiles[nextR][nextC];
                Tile curr = tiles[r][c];
                if (next == null) {
                    if (checkingAvailableMoves)
                        return true;
                    tiles[nextR][nextC] = curr;
                    tiles[r][c] = null;
                    r = nextR;
                    c = nextC;
                    nextR += yIncr;
                    nextC += xIncr;
                    moved = true;
                } else if (next.canMergeWith(curr)) {
                    if (checkingAvailableMoves)
                        return true;
                    int value = next.mergeWith(curr);
                    if (value > highest)
                        highest = value;
                    score += value;
                    tiles[r][c] = null;
                    moved = true;
                    break;
                } else
                    break;
            }
        }
        if (moved) {
            if (highest < target) {
                clearMerged();
                addRandomTile();
                if (!movesAvailable()) {
                    gamestate = State.over;
                }
            } else if (highest == target)
                gamestate = State.won;
        }
        return moved;
    }
    boolean moveUp() {
        return move(0, -1, 0);
    }
    boolean moveDown() {
        return move(side * side - 1, 1, 0);
    }
    boolean moveLeft() {
        return move(0, 0, -1);
    }
    boolean moveRight() {
        return move(side * side - 1, 0, 1);
    }
    void clearMerged() {
        for (Tile[] row : tiles)
            for (Tile tile : row)
                if (tile != null)
                    tile.setMerged(false);
    }
    boolean movesAvailable() {
        checkingAvailableMoves = true;
        boolean hasMoves = moveUp() || moveDown() || moveLeft() || moveRight();
        checkingAvailableMoves = false;
        return hasMoves;
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame f = new JFrame();
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setTitle("2048");
            f.setResizable(true);
            f.add(new Game2048(), BorderLayout.CENTER);
            f.pack();
            f.setLocationRelativeTo(null);
            f.setVisible(true);
        });
    }
}
class Tile {
    private boolean merged;
    private int value;
    Tile(int val) {
        value = val;
    }
    int getValue() {
        return value;
    }
    void setMerged(boolean m) {
        merged = m;
    }
    boolean canMergeWith(Tile other) {
        return !merged && other != null && !other.merged && value == other.getValue();
    }
    int mergeWith(Tile other) {
        if (canMergeWith(other)) {
            value *= 2;
            merged = true;
            return value;
        }
        return -1;
    }
}