import java.awt.*; 
import java.awt.event.*; 
public class greedsnake //主類 
{

/** 
* @param args 
*/ 
public static void main(String[] args) { 
// TODO Auto-generated method stub 
new MyWindow();

}

} 
class MyPanel extends Panel implements KeyListener,Runnable//自定義面板類，繼承了鍵盤和線程接口 
{

Button snake[]; //定義蛇按鈕 
int shu=0; //蛇的節(jié)數(shù) 
int food[]; //食物數(shù)組 
boolean result=true; //判定結果是輸 還是贏 
Thread thread; //定義線程 
static int weix,weiy; //食物位置 
boolean t=true; //判定游戲是否結束 
int fangxiang=0; //蛇移動方向 
int x=0,y=0; //蛇頭位置 
MyPanel() 
{

setLayout(null); 
snake=new Button[20]; 
food=new int [20]; 
thread=new Thread(this);


for(int j=0;j<20;j++) 
{ 
food[j]=(int)(Math.random()*99);//定義20個隨機食物 
}

weix=(int)(food[0]*0.1)*60; //十位*60為橫坐標 
weiy=(int)(food[0]%10)*40; //個位*40為縱坐標 
for(int i=0;i<20;i++) 
{ 
snake[i]=new Button(); 
}

add(snake[0]); 
snake[0].setBackground(Color.black); 
snake[0].addKeyListener(this); //為蛇頭添加鍵盤監(jiān)視器 
snake[0].setBounds(0,0,10,10); 
setBackground(Color.cyan); 
}

public void run() //接收線程 
{


while(t) 
{


if(fangxiang==0)//向右 
{ 
try 
{ 
x+=10; 
snake[0].setLocation(x, y);//設置蛇頭位置

if(x==weix&&y==weiy) //吃到食物 
{ 
shu++; 
weix=(int)(food[shu]*0.1)*60; 
weiy=(int)(food[shu]%10)*40; 
repaint(); //重繪下一個食物 
add(snake[shu]); //增加蛇節(jié)數(shù)和位置 
snake[shu].setBounds(snake[shu-1].getBounds()); 
} 
thread.sleep(100); //睡眠100ms 
} 
catch(Exception e){} 
} 
else if(fangxiang==1)//向左 
{ 
try 
{ 
x-=10; 
snake[0].setLocation(x, y); 
if(x==weix&&y==weiy) 
{ 
shu++; 
weix=(int)(food[shu]*0.1)*60; 
weiy=(int)(food[shu]%10)*40; 
repaint(); 
add(snake[shu]); 
snake[shu].setBounds(snake[shu-1].getBounds()); 
}

thread.sleep(100); 
} 
catch(Exception e){} 
} 
else if(fangxiang==2)//向上 
{ 
try 
{ 
y-=10; 
snake[0].setLocation(x, y); 
if(x==weix&&y==weiy) 
{ 
shu++; 
weix=(int)(food[shu]*0.1)*60; 
weiy=(int)(food[shu]%10)*40; 
repaint(); 
add(snake[shu]); 
snake[shu].setBounds(snake[shu-1].getBounds()); 
} 
thread.sleep(100); 
} 
catch(Exception e){} 
} 
else if(fangxiang==3)//向下 
{ 
try 
{ 
y+=10; 
snake[0].setLocation(x, y); 
if(x==weix&&y==weiy) 
{ 
shu++; 
weix=(int)(food[shu]*0.1)*60; 
weiy=(int)(food[shu]%10)*40; 
repaint(); 
add(snake[shu]); 
snake[shu].setBounds(snake[shu-1].getBounds()); 
} 
thread.sleep(100); 
} 
catch(Exception e){} 
} 
int num1=shu; 
while(num1>1)//判斷是否咬自己的尾巴 
{ 
if(snake[num1].getBounds().x==snake[0].getBounds().x&&snake[num1].getBounds().y==snake[0].getBounds().y) 
{ 
t=false; 
result=false; 
repaint(); 
} 
num1--; 
} 
if(x<0||x>=this.getWidth()||y<0||y>=this.getHeight())//判斷是否撞墻 
{ 
t=false; 
result=false; 
repaint(); 
} 
int num=shu; 
while(num>0) //設置蛇節(jié)位置 
{ 
snake[num].setBounds(snake[num-1].getBounds()); 
num--; 
}


if(shu==15) //如果蛇節(jié)數(shù)等于15則勝利 
{ 
t=false; 
result=true; 
repaint(); 
}

}


} 
public void keyPressed(KeyEvent e) //按下鍵盤方向鍵 
{ 
if(e.getKeyCode()==KeyEvent.VK_RIGHT)//右鍵 
{ 
if(fangxiang!=1)//如果先前方向不為左 
fangxiang=0;


} 
else if(e.getKeyCode()==KeyEvent.VK_LEFT) 
{ if(fangxiang!=0) 
fangxiang=1;


} 
else if(e.getKeyCode()==KeyEvent.VK_UP) 
{ if(fangxiang!=3) 
fangxiang=2;


} 
else if(e.getKeyCode()==KeyEvent.VK_DOWN) 
{ if(fangxiang!=2) 
fangxiang=3;


} 
}

public void keyTyped(KeyEvent e) 
{

} 
public void keyReleased(KeyEvent e) 
{

} 
public void paint(Graphics g) //在面板上繪圖 
{ 
int x1=this.getWidth()-1; 
int y1=this.getHeight()-1; 
g.setColor(Color.red); 
g.fillOval(weix, weiy, 10, 10);//食物 
g.drawRect(0, 0, x1, y1); //墻 
if(t==false&&result==false) 
g.drawString("GAME OVER!", 250, 200);//輸出游戲失敗 
else if(t==false&&result==true) 
g.drawString("YOU WIN!", 250, 200);//輸出游戲成功 
}

} 
class MyWindow extends Frame implements ActionListener//自定義窗口類 
{ 
MyPanel my; 
Button btn; 
Panel panel; 
MyWindow() 
{ 
super("GreedSnake"); 
my=new MyPanel(); 
btn=new Button("begin"); 
panel=new Panel(); 
btn.addActionListener(this); 
panel.add(new Label("begin后請按Tab鍵選定蛇")); 
panel.add(btn); 
panel.add(new Label("按上下左右鍵控制蛇行動")); 
add(panel,BorderLayout.NORTH); 
add(my,BorderLayout.CENTER); 
setBounds(100,100,610,500); 
setVisible(true); 
validate(); 
addWindowListener(new WindowAdapter() 
{ 
public void windowClosing(WindowEvent e) 
{ 
System.exit(0); 
} 
}); 
} 
public void actionPerformed(ActionEvent e)//按下begin按鈕 
{

if(e.getSource()==btn) 
{ 
try 
{ 
my.thread.start(); //開始線程 
my.validate(); 
} 
catch(Exception ee){} 
}

} 
}