编写完整贪吃蛇游戏，使用JAVA语言，用IntelliJ IDEA 软件编写

好的，我可以为您提供一个基于Java语言和IntelliJ IDEA软件的简单贪吃蛇游戏实现。下面是一个基本的实现步骤：

1. 创建一个新的Java项目，命名为SnakeGame。

2. 在src目录下创建一个名为“snake”的包，用于存放所有的Java类。

3. 创建一个名为“Snake”的Java类，该类表示贪吃蛇本身，包括其当前位置、方向和长度等属性，以及其移动、生长等行为。

package snake;

public class Snake {
    private int length; // 贪吃蛇长度
    private int[] x; // 贪吃蛇每一节的横坐标
    private int[] y; // 贪吃蛇每一节的纵坐标
    private int direction; // 贪吃蛇移动的方向

    public Snake(int length) {
        this.length = length;
        x = new int[length];
        y = new int[length];
        for (int i = 0; i < length; i++) {
            x[i] = 0;
            y[i] = i;
        }
        direction = 1;
    }

    public void move() {
        for (int i = length - 1; i > 0; i--) {
            x[i] = x[i - 1];
            y[i] = y[i - 1];
        }
        switch (direction) {
            case 0:
                y[0]--;
                break;
            case 1:
                x[0]++;
                break;
            case 2:
                y[0]++;
                break;
            case 3:
                x[0]--;
                break;
        }
    }

    public void grow() {
        length++;
        int[] newx = new int[length];
        int[] newy = new int[length];
        for (int i = 0; i < length - 1; i++) {
            newx[i] = x[i];
            newy[i] = y[i];
        }
        newx[length - 1] = x[length - 2];
        newy[length - 1] = y[length - 2];
        x = newx;
        y = newy;
    }

    public boolean hitWall(int width, int height) {
        if (x[0] < 0 || x[0] >= width || y[0] < 0 || y[0] >= height) {
            return true;
        }
        return false;
    }

    public boolean hitBody() {
        for (int i = 1; i < length; i++) {
            if (x[0] == x[i] && y[0] == y[i]) {
                return true;
            }
        }
        return false;
    }

    public void setDirection(int direction) {
        this.direction = direction;
    }

    public int getLength() {
        return length;
    }

    public int getX(int index) {
        return x[index];
    }

    public int getY(int index) {
        return y[index];
    }

    public int getDirection() {
        return direction;
    }
}

4. 创建一个名为“Food”的Java类，该类表示食物，包括其位置和生成位置等属性、以及其随机生成的行为。

package snake;

import java.util.Random;

public class Food {
    private int x; // 食物的横坐标
    private int y; // 食物的纵坐标

    public Food(int width, int height) {
        generate(width, height);
    }

    public void generate(int width, int height) {
        Random rand = new Random();
        x = rand.nextInt(width - 1);
        y = rand.nextInt(height - 1);
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }
}

5. 创建一个名为“GamePanel”的Java类，该类表示整个游戏界面，包括其大小、贪吃蛇和食物的显示、以及键盘事件的监听等行为。

package snake;

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

public class GamePanel extends JPanel implements KeyListener {
    private Snake snake;
    private Food food;
    private int width;
    private int height;
    private boolean gameover;

    public GamePanel(int width, int height) {
        this.width = width;
        this.height = height;
        snake = new Snake(3);
        food = new Food(width, height);
        gameover = false;
        setPreferredSize(new Dimension(width * 10, height * 10));
        setBackground(Color.WHITE);
        setFocusable(true);
        addKeyListener(this);
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (!gameover) {
                    snake.move();
                    if (snake.getX(0) == food.getX() && snake.getY(0) == food.getY()) {
                        snake.grow();
                        food.generate(width, height);
                    }
                    if (snake.hitWall(width, height) || snake.hitBody()) {
                        gameover = true;
                    }
                    repaint();
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                JOptionPane.showMessageDialog(null, "Game Over!");
                System.exit(0);
            }
        }).start();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.RED);
        g.fillRect(food.getX() * 10, food.getY() * 10, 10, 10);
        g.setColor(Color.BLACK);
        for (int i = 0; i < snake.getLength(); i++) {
            g.fillRect(snake.getX(i) * 10, snake.getY(i) * 10, 10, 10);
        }
    }

    @Override
    public void keyPressed(KeyEvent e) {
        switch (e.getKeyCode()) {
            case KeyEvent.VK_UP:
                if (snake.getDirection() != 2) {
                    snake.setDirection(0);
                }
                break;
            case KeyEvent.VK_RIGHT:
                if (snake.getDirection() != 3) {
                    snake.setDirection(1);
                }
                break;
            case KeyEvent.VK_DOWN:
                if (snake.getDirection() != 0) {
                    snake.setDirection(2);
                }
                break;
            case KeyEvent.VK_LEFT:
                if (snake.getDirection() != 1) {
                    snake.setDirection(3);
                }
                break;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {

    }

    @Override
    public void keyTyped(KeyEvent e) {

    }
}

6. 创建一个名为“SnakeGame”的Java类，该类表示整个游戏的入口和启动。

package snake;

import javax.swing.*;

public class SnakeGame {
    public static void main(String[] args) {
        int width = 40;
        int height = 30;
        JFrame frame = new JFrame("Snake Game");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new GamePanel(width, height));
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

7. 运行SnakeGame类，即可启动贪吃蛇游戏。

这份代码只是一个简单的实现，您可以根据自己的需求进行修改和完善。