各个功能的实现总的来说就是如下几步：
定义数据
画上去
监听事件（键盘、事件）
Data.java
public class Data {
public static URL bodyUrl = Data.class.getResource("statics/body.png");
public static ImageIcon body = new ImageIcon(bodyUrl);
public static URL downUrl = Data.class.getResource("statics/down.png");
public static ImageIcon down = new ImageIcon(downUrl);
public static URL foodUrl = Data.class.getResource("statics/food.png");
public static ImageIcon food = new ImageIcon(foodUrl);
public static URL headerUrl = Data.class.getResource("statics/header.png");
public static ImageIcon header = new ImageIcon(headerUrl);
public static URL leftUrl = Data.class.getResource("statics/left.png");
public static ImageIcon left = new ImageIcon(leftUrl);
public static URL rightUrl = Data.class.getResource("statics/right.png");
public static ImageIcon right = new ImageIcon(rightUrl);
public static URL upUrl = Data.class.getResource("statics/up.png");
public static ImageIcon up = new ImageIcon(upUrl);
}
GamePanel.java
//游戏的面板
public class GamePanel extends JPanel implements KeyListener, ActionListener {
//定义蛇的数据结构
int length;//蛇的长度
int[] snakeX = new int[600];//蛇的X坐标 25*25
int[] snakeY = new int[500];//蛇的Y坐标 25*25
String fx;
//食物的坐标
int foodx;
int foody;
Random random = new Random();
int score;//成绩
//游戏当前的状态:开始/停止
boolean isStart = false;//默认是不开始
boolean isfail = false;//游戏失败状态
//定时器 以ms为单位 1000ms = 1s
Timer timer = new Timer(150,this);//100ms执行一次
//构造器
public GamePanel() {
init();
//获得焦点和键盘事件
this.setFocusable(true);//获得焦点事件
this.addKeyListener(this);//获得键盘监听事件
timer.start();//游戏一开始就启动
}
//初始化方法
public void init(){
length = 3;
snakeX[0] = 100;snakeY[0] = 100;//脑袋的坐标
snakeX[1] = 75;snakeY[1] = 100;//第一个身体的坐标
snakeX[2] = 50;snakeY[2] = 100;//第二个身体的坐标
fx = "R";//初始方向，向右
//把食物随机分布在界面上
foodx = 25 + 25*random.nextInt(34);
foody = 75 +25*random.nextInt(24);
score = 0;
}
//绘制画板，所有东西都是用这个画笔来画
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);//清屏
//绘制静态的面板
this.setBackground(Color.WHITE);
Data.header.paintIcon(this, g, 25, 11);//头部广告栏
g.fillRect(25,75,850,600);//默认的游戏界面
//把蛇画上去
if (fx.equals("R")){
Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);
}else if(fx.equals("L")){
Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
}else if(fx.equals("U")){
Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
}else if(fx.equals("D")){
Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
}
for (int i = 1; i < length; i++) {
Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
}
//画食物
Data.food.paintIcon(this,g,foodx,foody);
//画积分
g.setColor(Color.WHITE);
g.setFont(new Font("微软雅黑", Font.BOLD, 18));
g.drawString("长度"+length,750,35);
g.drawString("分数"+score,750,50);
//游戏状态
if(isStart == false){
g.setColor(Color.WHITE);
g.setFont(new Font("微软雅黑", Font.BOLD, 40));
g.drawString("按下空格开始游戏",300,300);
}
if(isfail == true){
g.setColor(Color.RED);
g.setFont(new Font("微软雅黑", Font.BOLD, 40));
g.drawString("失败！按下空格重新开始",300,300);
}
}
//键盘监听事件
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();//获得键盘按键是哪一个
if (keyCode == KeyEvent.VK_SPACE) {//如果按下的是空格键
if (isfail) {
//重新开始
isfail = false;
init();
} else {
isStart = !isStart;//取反
}
repaint();
}
//小蛇移动
if (keyCode == KeyEvent.VK_UP) {
fx = "U";
} else if (keyCode == KeyEvent.VK_DOWN) {
fx = "D";
} else if (keyCode == KeyEvent.VK_LEFT) {
fx = "L";
} else if (keyCode == KeyEvent.VK_RIGHT) {
fx = "R";
}
}
//事件监听
@Override
public void actionPerformed(ActionEvent e) {
if(isStart && isfail==false){//符合条件就让蛇动起来
//右移
for (int i = length-1; i > 0; i--) {
snakeX[i] = snakeX[i-1];
snakeY[i] = snakeY[i-1];
}
//走向
if (fx.equals("R")){
snakeX[0] = snakeX[0]+25;
if (snakeX[0]>850){ snakeX[0] = 25;}//边界判断
}else if (fx.equals("L")){
snakeX[0] = snakeX[0]-25;
if (snakeX[0]<25){ snakeX[0] = 850;}//边界判断
} else if (fx.equals("U")){
snakeY[0] = snakeY[0]-25;
if (snakeY[0]<75){ snakeY[0] = 650;}//边界判断
} else if (fx.equals("D")){
snakeY[0] = snakeY[0]+25;
if (snakeY[0]>650){ snakeY[0] = 75;}//边界判断
}
//吃食物
if(snakeX[0] == foodx && snakeY[0] ==foody){
//长度1
length++;
//分数加10
score = score +10;
//再次随机食物
foodx = 25 + 25*random.nextInt(34);
foody = 75 +25*random.nextInt(24);
}
//失败判断（撞到自己算失败）
for (int i = 1; i < length; i++) {
if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
isfail = true;
}
}
repaint();//重画页面
}
timer.start();//定时器开启
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
}
}
StartGame.java
//游戏的主启动类
public class StartGame {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setBounds(10, 10, 900, 720);
frame.setResizable(false);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.add(new GamePanel());
frame.setVisible(true);
}
}
效果图：
原文：https://www.cnblogs.com/hellowen/p/12852790.html