java贪吃蛇（障碍物*咬尾巴）
ArrayList的各种方法addAll(),add(),remove(),clear()，与数组的区别
退出：System.exit(0);
JPanel的paintComponent(Graphics g)方法，有GUI系统调用，或者调用JPanel.repaint()重绘
KeyListener监听按键事件，非数字去方向键为VK_DOWN..数字区方向键为VK_PK_...
Timer time=new Timer(delay,listenr)
time.start()
time.stop()
开启后listener持续监听相应事件，每隔delay段时间刷新
感觉像是写的面向方法的程序，只有一个类和内部类，其余全是方法^^
Snake.java
import java.awt.Color.*;
import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
import javax.swing.Timer.*;
import java.awt.event.*;
import javax.swing.JComponent.*;
public class Snake{
JFrame frame;
MyPanel panel;
ArrayList- snake;//蛇体
Item food;//食物
int dir;//行进方向
static int UP=-1;
static int DOWN=1;
static int LEFT=-10;
static int RIGHT=10;
static int l=10;//长度
boolean lose=false;//是否输了
int width=300;//待定
int height=300;
int score=0;//分数
int randX=0;//任意选中的x坐标
int randY=0;//任意选中的y坐标
boolean has;//是否被占用,true则为占用
public static void main(String[] args){
Snake test=new Snake();
test.init();
}
//界面初始化
public void init(){
if(food!=null)
food=null;
//protected snake.removeRange(0,snake.size());
snake=new ArrayList
- ();
if(!snake.isEmpty()){
dir=0;
snake.clear();}
if(frame==null)
frame=new JFrame();
if(panel==null)
panel=new MyPanel();
if(time.isRunning())
time.stop();
// panel.repaint();
// snake=new ArrayList
- ();
// addFood();
food=new Item(13,5);
addSnake();
panel.addKeyListener(key);
panel.setFocusable(true);
// addFood();
// panel.repaint();
frame.getContentPane().add(panel);
// frame.addActionListener(listen);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(width,height);
frame.setVisible(true);
panel.repaint();
}
//获取随机位置
public void random(){
// boolean canUse=false;
// int randX;
// int randY;
while(true){
randX=(int)(Math.random()*28);
randY=(int)(Math.random()*29);
if(!include(randX,randY)){
// canUse=true;
break;
}
}
}
//位置是否已经被占用,true为被占用
public boolean include(int loaX,int loaY){
boolean contain=false;
for(Item it:snake){
if(it.equals(loaX,loaY)){
contain=true;
break;
}
}
if(food.equals(loaX,loaY))
contain=true;
return contain;
}
//吃food,如果has为true表示已经吃到了食物
public void eat(Item pos){
int x=pos.getX();
int y=pos.getY();
has=false;
if(food.equals(x,y)){
has=true;
// food=null;
addFood();
}
}
//增加snake
public void addSnake(){
random();
Item one=new Item(randX,randY);
snake.add(0,one);
}
//增加food
public void addFood(){
score++;
random();
food=new Item(randX,randY);
}
//前进
public void forward(int d){
Item head=snake.get(0);
int x=head.getX()+dir/10;
int y=head.getY()+dir%10;
System.out.println("forward");
head=new Item(x,y);
snake.add(0,head);//添加头部
eat(head);//判断是否吃到了食物
if(!has){//如果没有吃到食物，去掉最后一个item
snake.remove(snake.size()-1);
} lose();
if(lose==true){
System.out.println("start()");
lose=false;
start();
}
}
//JFrame的ActionListener
ActionListener listen=new ActionListener(){
public void actionPerformed(ActionEvent e){
System.out.println("调用ActionPerformed");
forward(dir);
panel.repaint();//重绘
}
};
//刷新频率
Timer time=new Timer(230,listen);
//KeyListener
KeyListener key=new KeyListener(){
public void keyPressed(KeyEvent k){
// System.out.println("引用keyPress");
if(k.getKeyCode()==KeyEvent.VK_UP){
if(dir!=Snake.DOWN)
dir=Snake.UP;
}
if(k.getKeyCode()==KeyEvent.VK_DOWN){
if(dir!=Snake.UP)
dir=Snake.DOWN;
// }
}
if(k.getKeyCode()==KeyEvent.VK_LEFT){
if(dir!=Snake.RIGHT)
dir=Snake.LEFT;}
if(k.getKeyCode()==KeyEvent.VK_RIGHT){
if(dir!=Snake.LEFT)
dir=Snake.RIGHT;}
// System.out.println("调用forward(dir)");
// System.out.println(dir);
// forward(dir);
time.start();
// panel.repaint();
}
public void keyReleased(KeyEvent k){}
public void keyTyped(KeyEvent k){}
};
//重绘
class MyPanel extends JPanel{
public void paintComponent(Graphics g){
//刷新背景 heise
System.out.println("调用paintComponent");
g.setColor(Color.white);
g.fillRect(0,0,this.getWidth(),this.getHeight());
System.out.println(this.getWidth()+" "+this.getHeight());
//蛇身红色
g.setColor(Color.yellow);
g.fillRect(290,0,l,this.getHeight());
int red=(int)(Math.random()*255);
int green=(int)(Math.random()*255);
int blue=(int)(Math.random()*255);
g.setColor(new Color(red,green,blue));
for(Item items:snake){
int posX=items.getX();
int posY=items.getY();
if(posX>=29){
System.out.println("posX大于29,lose=true");
lose=true;}
if(posX<=0)
items.setX(28);
if(posY>=29)
items.setY(0);
if(posY<=0)
items.setY(29);
// System.out.println(i+" "+posY);
//待会在设置位置，大小
g.fillOval(items.getX()*l,items.getY()*l,l,l);
}
//食物为绿色
g.setColor(Color.green);
int foodX=food.getX();
int foodY=food.getY();
//同上
g.fillOval(foodX*l,foodY*l,l,l);
}
}
//判断是否输了 返回true则输了
public void lose(){
int oneX=snake.get(0).getX();
int oneY=snake.get(0).getY();
for(int i=1;iif(snake.get(i).equals(oneX,oneY)){
System.out.println("你输了！");
lose=true;
break;
}
}
System.out.println("lose()"+lose);
}
public void start(){
int isRestart = JOptionPane.showConfirmDialog(frame,"分数："+score+" 是否重新开始？", "重新开始", JOptionPane.YES_NO_OPTION);
score=0;
if (isRestart == JOptionPane.YES_OPTION) {
init();
}else{
System.exit(0);
}
}
//Item类
class Item{
int xPos;//item的x坐标
int yPos;//y坐标
public Item(int x,int y){
this.xPos=x;
this.yPos=y;
}
public int getX(){
return xPos;
}
public int getY(){
return yPos;
}
public void setX(int x){
xPos=x;
}
public void setY(int y){
yPos=y;
}
//判断两个坐标是否相等，true为相等
public boolean equals(int aX,int aY){
if((aX==xPos)&&(aY==yPos)){
return true;
}
else{
return false;
}
}
}
}