再次重写贪吃蛇代码(多线程,有游戏的小地图)

/*  *12.24日,完成了蛇撞到自己的检测.修改方法是在蛇的初始化的时候,用双循环来置FALSE; * 在重写代码的时候,我借鉴了别人的思路:将整个游戏的界面定义为一个布尔型的二维数组. * 用一个LinkedList来储存蛇.当蛇移动的时候,在蛇的头部增加一个节点,然后删除最后一个节点. * 因为只是做练习,所以没做游戏界面,比如菜单栏,计分栏什么的. */import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.util.*;

public class Game { public static void main(String args[]) {  GameFrame frame = new GameFrame();  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  frame.setResizable(false);  frame.show();  JOptionPane.showMessageDialog(null, "上,下左,右控制蛇的方向/n回车开始,S暂停"); }}

class GameFrame extends JFrame { public GameFrame() {  setSize(294, 482);  setTitle("贪吃蛇DEMO");  this.setLocation(360, 100);  Container c = getContentPane();  GamePanel panel = new GamePanel();  c.add(panel, BorderLayout.CENTER); }}

class GamePanel extends JPanel implements KeyListener { static int panelWidth = 294;

 static int panelHeight = 450;

 int rectX = 15;

 int rectY = 15;

 Snake snake;

 Node n;

 public GamePanel() {  snake = new Snake(this, panelWidth / rectX, panelHeight / rectY);  setBackground(Color.WHITE);  setSize(panelWidth, panelHeight);  setFocusable(true);  addKeyListener(this); }

 public void paintComponent(Graphics g) {  super.paintComponent(g);  Graphics2D g2 = (Graphics2D) g;  LinkedList list = snake.snakeList;  Iterator it = list.iterator();  g2.setColor(Color.black);  while (it.hasNext()) {   n = (Node) it.next();   drawNode(g2, n);  }  g2.setColor(Color.ORANGE);  Node f = snake.food;  drawNode(g2, f);  snake.draw(g2);// 绘制地图 }

 public void keyPressed(KeyEvent e) {  int keycode = e.getKeyCode();  if (keycode == KeyEvent.VK_ENTER) {   begin();  } else if (keycode == KeyEvent.VK_UP) {   snake.changeDirection(Snake.up);  } else if (keycode == KeyEvent.VK_DOWN) {   snake.changeDirection(Snake.down);  } else if (keycode == KeyEvent.VK_LEFT) {   snake.changeDirection(Snake.left);  } else if (keycode == KeyEvent.VK_RIGHT) {   snake.changeDirection(Snake.right);  } else if (keycode == KeyEvent.VK_S) {   Snake.run = false;  } }

 public void keyReleased(KeyEvent e) { }

 public void keyTyped(KeyEvent e) { }

 public void drawNode(Graphics2D g, Node n) {  g.fillRect(n.x * rectX, n.y * rectY, rectX - 2, rectY - 2); }

 public void begin() {  Snake.run = true;  SnakeThread thread = new SnakeThread(snake);  thread.start(); }}

class Node { int x;

 int y;

 public Node(int x, int y) {  this.x = x;  this.y = y; }}

class SnakeThread extends Thread { Snake snake;

 public SnakeThread(Snake s) {  snake = s; }

 public void run() {  Snake.run = true;  while (Snake.run) {   try {    snake.move();    sleep(200);   } catch (InterruptedException e) {   }  }  Snake.run = false; }}

class Snake { GamePanel panel;

 Node food;

 boolean[][] all;

 public static boolean run;

 int maxX;

 int maxY;

 public static int left = 1;

 public static int up = 2;

 public static int right = 3;

 public static int down = 4;

 int direction = 4;

 LinkedList snakeList = new LinkedList();

 public Snake(GamePanel p, int maxX, int maxY) {  panel = p;  this.maxX = maxX;  this.maxY = maxY;  all = new boolean[maxX][maxY];  for (int i = 0; i < maxX; i++) {   for (int j = 0; j < maxY; j++) {    all[i][j] = false;   }  }  int arrayLength = maxX > 20 ? 10 : maxX / 2;  for (int i = 0; i < arrayLength; i++) {   int x = maxX / 10 + i;   int y = maxY / 10;   snakeList.addFirst(new Node(x, y));   all[x][y] = true;  }  food = createFood();  all[food.x][food.y] = true; }

 public void move() {  Node n = (Node) snakeList.getFirst();  int x = n.x;  int y = n.y;

  if (direction == 3) {   x++;  } else if (direction == 4) {   y++;  } else if (direction == 1) {   x--;  } else if (direction == 2) {   y--;  }

  if ((0 <= x && x <= GamePanel.panelWidth / 15 - 1)    && (0 <= y && y <= GamePanel.panelHeight / 15 - 1)) {   if (all[x][y]) {    if (x == food.x && y == food.y) {     snakeList.addFirst(food);     food = createFood();     all[food.x][food.y] = true;    } else {     JOptionPane.showMessageDialog(null, "你撞到自己了");     System.exit(0);    }   } else {    snakeList.addFirst(new Node(x, y));    all[x][y] = true;    Node l = (Node) snakeList.getLast();    snakeList.removeLast();    all[l.x][l.y] = false;   }  } else {   JOptionPane.showMessageDialog(null, "越界了,游戏结束");   System.exit(0);  }  panel.repaint(); }

 public Node createFood() {  int x = 0;  int y = 0;  do {   Random r = new Random();   x = r.nextInt(maxX - 10);   y = r.nextInt(maxY - 10);

  } while (all[x][y]);  return new Node(x, y); }

 public void changeDirection(int newDirection) {  if (direction % 2 != newDirection % 2) {   direction = newDirection;  } }

 public void draw(Graphics2D g) {  for (int i = 0; i < maxX; i++) {   for (int j = 0; j < maxY; j++) {    if (all[i][j] == true) {     g.setColor(Color.red);     g.fillRect(i, j, 4, 4);    }   }  } }}