java贪吃蛇源码

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java是一种面向对象的语言，有着其中不用质疑的优点。学习java将近三个月了，一直在琢磨着“万物皆对象”的意义，却总是只知其表不知其意，做完这个java贪吃蛇后才有了那么一点的理解。直接上效果图。

游戏分为了六个类，分别为：

Node类：蛇身都是由一个一个节点组成，所以首先将节点抽象为一个类。

Snake类：此类是一条蛇抽象出来的一个类。一种包含了存储节点的 LinkedList 类型的集合，蛇的移动的方式是头部加一个节点，尾部减去一个节点。蛇的类有着吃蛋、越界的行为方法。

SnakeGameView类：这个类是一个游戏界面的类，用于布局游戏的界面。

GameControl类：此类用于监听键盘，从而实现对游戏的操作。

GameRunThread类：此类是一个线程类，用于不断重画界面。

DrawView类：此类继承了面板类，从而拥有了paint（）方法的使用权，用于游戏面板的重画，像方格、蛇、蛋、的重画。

其中存在一个问题，就是游戏在不断的重画过程中，会出现游戏的闪烁问题，就引出了双缓冲的技术。

在编写程序的时候，总会出现我们意料之外的情况，像游戏变量权限问题、方法归属问题，都需要我们进行思考，如何让我们的程序执行、编写起来更合理、更加符合面向对象编程的思维维，护时改动最少的代码去实现最好的效果，这些都应该是我们去思考的问题。对于游戏的越界问题，一般有两种方式：中心检测法和边界检测法，在这里我用的是边界检测法，具体情况具体选择。

程序可能有着其他不太合理之处，还请大家原谅一个学java不到三个月的求学者。谢谢大家。下面开始上源码。

Node类

public class Node {
	
	private int nodeX;
	private int nodeY;
	
	public Node(int nodeX, int nodeY) {
		
		this.nodeX = nodeX;
		this.nodeY = nodeY;
	}
	
	public int getNodeX() {
		
		return nodeX; 
	}
	public void setNodeX(int nodeX) {
		
		this.nodeX = nodeX;
	}
	public int getNodeY() {
		
		return nodeY;
	}
	public void setNodeY(int nodeY) {
		
		this.nodeY = nodeY;
	}

}

Snake类

public class Snake {
	
	private LinkedList<Node> snakeBody;
	private Random random;
	//Snake的方向    0上， 1 右 ， 2 下 ， 3 左
	private int direction = 0;  
	
	private SnakeGameView snakeGameView;
	
	public Snake(int snakeHeadX, int snakeHeadY, SnakeGameView snakeGameView) {
		random = new Random();
		snakeBody = new LinkedList<>();
		snakeBody.add(new Node(snakeHeadX, snakeHeadY));
		this.snakeGameView = snakeGameView;
	}
	
	//获取Snake的方向
	public int getDirection() {
		
		return direction;
	}
	//设置Snake方向
	public void setDirection(int direction) {
		
		this.direction = direction;
	}
	//获取Snake头部结点
	public Node getSnakeHead() {
		
		return snakeBody.getFirst();
	}
	//获取Snake尾部结点
	public Node getSnakeTail() {
		
		return snakeBody.getLast();
	}
	//获取Snake的Body
	public LinkedList<Node> getSnakeBody(){
		
		return snakeBody;
	}
	//Snake移动
	public void snakeMove() {
		
		switch(direction) {
		case 0:
			snakeBody.addFirst(new Node(getSnakeHead().getNodeX() ,getSnakeHead().getNodeY() - DrawView.VIEW_NUMBER));
			break;
		case 1:
			snakeBody.addFirst(new Node(getSnakeHead().getNodeX() + DrawView.VIEW_NUMBER,getSnakeHead().getNodeY()));
			break;
		case 2:
			snakeBody.addFirst(new Node(getSnakeHead().getNodeX(),getSnakeHead().getNodeY()+ DrawView.VIEW_NUMBER));
			break;
		case 3:
			snakeBody.addFirst(new Node(getSnakeHead().getNodeX() - DrawView.VIEW_NUMBER,getSnakeHead().getNodeY()));
			break;
		}
		snakeBody.removeLast();
	}
	//Snake 吃Egg
	public void eatEgg(Node egg) {
		if(snakeBody.getFirst().getNodeX() == egg.getNodeX() && snakeBody.getFirst().getNodeY() == egg.getNodeY()) {
		   snakeBody.add(egg);
		   //产蛋
		   snakeGameView.setEgg(random.nextInt(DrawView.VIEW_WIDTH - 1) * DrawView.VIEW_NUMBER,
					random.nextInt(DrawView.VIEW_WIDTH - 1) * DrawView.VIEW_NUMBER);
		   SnakeGameView.gameScore = SnakeGameView.gameScore + 5;
		   snakeGameView.getJTextArea().setText(SnakeGameView.gameScore + "");
		   System.out.println("吃到蛋了");
		}
	}
	//Snake越界
	public void snakeRunInterface() {
		
		if(this.getSnakeHead().getNodeX() < 0 || this.getSnakeHead().getNodeY() < 0||
				this.getSnakeHead().getNodeX() > (DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER)||
				this.getSnakeHead().getNodeY() > (DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER)) {
			SnakeGameView.gameState = false;
		}
	}
}

SnakeGameView类

public class SnakeGameView extends Frame{
		
	private JLabel jl;
	private DrawView drawView;
	private Panel panel;
	private JLabel scoreTitle;
	private JLabel score;
	private Panel rule;
	private JTextArea hint;
	
	private Random random;
	public static boolean gameState = true;
	public static int gameScore = 0;
	private Snake snake;
	private Node egg;
	private GameRunThread grt;
	private static Thread thread;
	
	public SnakeGameView() {
		
		random = new Random();
		//初始化Snake
		snake = new Snake(10 * DrawView.VIEW_NUMBER + random.nextInt(19) * DrawView.VIEW_NUMBER,
				10 * DrawView.VIEW_NUMBER + random.nextInt(19) * DrawView.VIEW_NUMBER,this);
		//初始化Egg
		egg = new Node(random.nextInt(DrawView.VIEW_WIDTH - 1) * DrawView.VIEW_NUMBER,
				random.nextInt(DrawView.VIEW_WIDTH - 1) * DrawView.VIEW_NUMBER);
		//初始化画板
		drawView = new DrawView(snake, egg);
		grt = new GameRunThread(drawView, snake);
		thread = new Thread(grt);	
		
		jl = new JLabel("SnakeGame-3.0",JLabel.CENTER);	
		panel = new Panel();
		scoreTitle = new JLabel("Score", JLabel.CENTER);
		score = new JLabel(gameScore + "", JLabel.CENTER);
		rule = new Panel();
		hint = new JTextArea("    操作方式\n      ↑\n  ←      →\n      ↓\n\n【Esc】退出程序\n\n关于\n");		
	}
	
	//设置鸡蛋
	public void setEgg(int eggX, int eggY) {
		
		this.egg.setNodeX(eggX);
		this.egg.setNodeY(eggY);
	}
	//获得
	public JLabel getJTextArea() {
		return score;
	}
	//主方法
	public static void main(String[] args) {
		
		new SnakeGameView().showView();
		thread.start();
	}
	public void showView() {
		
		jl.setFont(new Font("宋体", 1, 18));//设置字体，0正常，1粗体
		jl.setForeground(Color.white);//设置颜色
		jl.setBounds(0, 0, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER + 70, 40);
		drawView.setBackground(new Color(51,51,51));
		drawView.setBounds(20, 50, DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER + 1, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER + 1);
		panel.setLayout(null);	
		panel.setBackground(new Color(0,102,102));
		panel.setBounds(DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER + 40, 50, 150, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER);	
		scoreTitle.setFont(new Font("宋体", 1, 18));//设置字体，0正常，1粗体
		scoreTitle.setForeground(Color.white);//设置颜色
		scoreTitle.setBounds(0, 0, 150, 50);
		score.setFont(new Font("宋体", 1, 20));//设置字体，0正常，1粗体
		score.setForeground(Color.white);//设置颜色
		score.setBounds(0, 50, 150, 40);
		rule.setBackground(new Color(0,128,128));
		rule.setBounds(0, 90, 150, 1);
		hint.setFont(new Font("宋体", 0, 16));//设置字体，0正常，1粗体
		hint.setBounds(10, 100, 130, 150);
		hint.setBackground(new Color(0,102,102));
		
		panel.add(scoreTitle);
		panel.add(score);
		panel.add(rule);
		panel.add(hint);	
		this.add(jl);
		this.setTitle("SnakeGame-3.0");
		this.setSize(DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER + 210, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER + 70);
		this.setLocation(500, 200);
		this.setLayout(null);
		//this.setUndecorated(true);
		this.setBackground(new Color(0,128,128));
		this.add(drawView);
		this.add(panel);
		this.addKeyListener(new GameControl(snake));
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent we) {
				System.exit(0);
			}
		});
		this.setVisible(true);
		
	}

}

DrawView类

public class DrawView extends Panel{
	
	//画板的宽度高度
	public static final int VIEW_WIDTH = 40;
	public static final int VIEW_HEIGHT = 40;
	public static final int VIEW_NUMBER = 15;
	private Image iBuffer;  
	private Graphics gBuffer;  
	private Snake snake;
	private Node egg;
	
	public DrawView(Snake snake, Node egg) {
		
		this.snake = snake;
		this.egg = egg;
	}
	
	public void paint(Graphics g) {
		
		snake.snakeMove();
		this.drawGridding(g);
		this.drawSnake(g);
		this.drawEgg(g);
		snake.eatEgg(egg);
		System.out.println("("+snake.getSnakeHead().getNodeX()+","+snake.getSnakeHead().getNodeY()+")");
	}
	public void update(Graphics g) {
	 if(iBuffer==null)  
	    {  
	       iBuffer=createImage(DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER + 1, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER + 1);  
	       gBuffer=iBuffer.getGraphics();  
	    }  
	       gBuffer.setColor(getBackground());  
	       gBuffer.fillRect(0,0,DrawView.VIEW_WIDTH * DrawView.VIEW_NUMBER + 1, DrawView.VIEW_HEIGHT * DrawView.VIEW_NUMBER + 1);  
	       paint(gBuffer);  
	       g.drawImage(iBuffer,0,0,this); 
	}
	//画网格
	public void drawGridding(Graphics g) {
		
		g.setColor(new Color(128,128,128));
		for(int i = 0; i < VIEW_WIDTH; i++) {
			g.drawLine(0, i * VIEW_NUMBER, VIEW_WIDTH * VIEW_NUMBER, i * VIEW_NUMBER);
		}
		for(int i = 0; i < VIEW_HEIGHT; i++) {
			g.drawLine(i * VIEW_NUMBER, 0, i * VIEW_NUMBER, VIEW_WIDTH * VIEW_NUMBER);
		}
		
	}
	//画Snake
	public void drawSnake(Graphics g) {
		
		for(int i = 0; i < snake.getSnakeBody().size(); i ++) {
			g.setColor(Color.white);
			if(i == 0)
				g.setColor(Color.lightGray);
			g.fillRect(snake.getSnakeBody().get(i).getNodeX(), snake.getSnakeBody().get(i).getNodeY(), VIEW_NUMBER, VIEW_NUMBER);
		}
	}
	//画Egg
	public void drawEgg(Graphics g) {
		
		g.setColor(Color.yellow);
		g.fillRect(egg.getNodeX(), egg.getNodeY(), VIEW_NUMBER, VIEW_NUMBER);
	}
	
}

GameRunThread类

public class GameRunThread implements Runnable{

	private int runTime = 200;
	private DrawView drawView;
	private Snake snake;
	
	public GameRunThread(DrawView drawView, Snake snake) {
		this.drawView = drawView;
		this.snake = snake;
	}

	public void run() {
		
		while(true) {
			
			snake.snakeRunInterface();
			
			if(SnakeGameView.gameState) {
				
				drawView.repaint();
				
				try {
					Thread.sleep(runTime);
				}catch(InterruptedException e) {
					e.printStackTrace();
				}
					
			}
		}
		
	}

}

GameControl类

public class GameControl implements KeyListener{

	private Snake snake;
	
	public GameControl(Snake snake) {
		
		this.snake = snake;
	}
	
	public void keyReleased(KeyEvent ke) {
		
		switch(ke.getKeyCode()) {
		
		case KeyEvent.VK_UP:
			snake.setDirection(0);
			break;
		case KeyEvent.VK_RIGHT:
			snake.setDirection(1);
			break;
		case KeyEvent.VK_DOWN:
			snake.setDirection(2);
			break;
		case KeyEvent.VK_LEFT:
			snake.setDirection(3);
			break;
		case KeyEvent.VK_ENTER:
			
			if(SnakeGameView.gameState == true) 
				SnakeGameView.gameState = false;
			else 
				SnakeGameView.gameState = true;
			
			break;
		case KeyEvent.VK_ESCAPE:
			System.exit(0);
			break;
		}
	}

	public void keyPressed(KeyEvent arg0) {}
	public void keyTyped(KeyEvent arg0) {}

}