import java.util.*; 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event.*; 
public class SnakeGame{ 
public static void main(String[] args){ 
SnakeFrame frame = new SnakeFrame(); 
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
frame.setVisible(true); 
} 
} 
//----------記錄狀態的線程 
class StatusRunnable implements Runnable{ 
public StatusRunnable(Snake snake,JLabel statusLabel,JLabel scoreLabel){ 
this.statusLabel = statusLabel; 
this.scoreLabel = scoreLabel; 
this.snake = snake; 
} 
public void run(){ 
String sta = ""; 
String spe = ""; 
while(true){ 

switch(snake.status){ 
case Snake.RUNNING: 
sta = "Running";break; 
case Snake.PAUSED: 
sta = "Paused";break; 
case Snake.GAMEOVER: 
sta = "GameOver";break; 
} 
statusLabel.setText(sta); 
scoreLabel.setText(""+snake.score); 
try{ 
Thread.sleep(100); 
} 
catch(Exception e){ 
} 
} 
} 
private JLabel scoreLabel; 
private JLabel statusLabel; 
private Snake snake; 
} 
//----------蛇運動以及記錄分數的線程 
class SnakeRunnable implements Runnable{ 
public SnakeRunnable(Snake snake,Component component){ 
this.snake = snake; 
this.component = component; 
} 
public void run(){ 
while(true){ 
try{ 
snake.move(); 
component.repaint(); 
Thread.sleep(snake.speed); 
} 
catch(Exception e){ 
} 
} 
} 
private Snake snake; 
private Component component; 
} 
class Snake{ 
boolean isRun;//---------是否運動中 
ArrayList<Node> body;//-----蛇體 
Node food;//--------食物 
int derection;//--------方向 
int score ; 
int status; 
int speed; 
public static final int SLOW = 500; 
public static final int MID = 300; 
public static final int FAST = 100; 
public static final int RUNNING = 1; 
public static final int PAUSED = 2; 
public static final int GAMEOVER = 3; 
public static final int LEFT = 1; 
public static final int UP = 2; 
public static final int RIGHT = 3; 
public static final int DOWN = 4; 
public Snake(){ 
speed = Snake.SLOW; 
score = 0; 
isRun = false; 
status = Snake.PAUSED; 
derection = Snake.RIGHT; 
body = new ArrayList<Node>(); 
body.add(new Node(60,20)); 
body.add(new Node(40,20)); 
body.add(new Node(20,20)); 
makeFood(); 
} 
//------------判斷食物是否被蛇吃掉 
//-------如果食物在蛇運行方向的正前方，并且與蛇頭接觸，則被吃掉 
private boolean isEaten(){ 
Node head = body.get(0); 
if(derection == Snake.RIGHT && (head.x+Node.W) == food.x&&head.y == food.y ) 
return true; 
if(derection == Snake.LEFT && (head.x-Node.W) == food.x&&head.y == food.y ) 
return true; 
if(derection == Snake.UP && head.x == food.x&&(head.y-Node.H) == food.y ) 
return true; 
if(derection == Snake.DOWN && head.x == food.x&&(head.y+Node.H) == food.y ) 
return true; 
else return false; 
} 
//----------是否碰撞 
private boolean isCollsion(){ 
Node node = body.get(0); 
//------------碰壁 
if(derection == Snake.RIGHT && node.x == 280) 
return true; 
if(derection == Snake.UP && node.y == 0) 
return true; 
if(derection == Snake.LEFT && node.x == 0) 
return true; 
if(derection == Snake.DOWN && node.y == 380) 
return true; 
//--------------蛇頭碰到蛇身 
Node temp = null; 
int i = 0; 
for(i = 3;i<body.size();i++) 
{ 
temp = body.get(i); 
if(temp.x == node.x && temp.y==node.y) 
break; 
} 
if(i < body.size()) 
return true; 
else return false; 
} 
//-------在隨機的地方產生食物 
public void makeFood(){ 
Node node = new Node(0,0); 
boolean isInBody = true; 
int x = 0,y = 0; 
int X = 0,Y = 0; 
int i = 0; 
while(isInBody){ 
x = (int)(Math.random()*15); 
y = (int)(Math.random()*20); 
X = x*Node.W; 
Y = y*Node.H; 
for(i = 0;i < body.size();i ++){ 
if( X == body.get(i).x && Y == body.get(i).y) 
break; 
} 
if(i < body.size()) 
isInBody = true; 
else 
isInBody = false; 
} 
food = new Node(X,Y); 
} 
//---------改變運行方向 
public void changeDerection(int newDer){ 
if(derection%2 != newDer%2)//-------如果與原來方向相同或相反，則無法改變 
derection = newDer; 
} 
public void move(){ 
if(isEaten()){//-----如果食物被吃掉 
body.add(0,food);//--------把食物當成蛇頭成為新的蛇體 
score += 10; 
makeFood();//--------產生食物 
} 
else if(isCollsion())//---------如果碰壁或自身 
{ 
isRun = false; 
status = Snake.GAMEOVER;//-----結束 
} 
else if(isRun){//----正常運行（不吃食物，不碰壁，不碰自身） 
Node node = body.get(0); 
int X = node.x; 
int Y = node.y; 
//------------蛇頭按運行方向前進一個單位 
switch(derection){ 
case 1: 
X-=Node.W; 
break; 
case 2: 
Y-=Node.H; 
break; 
case 3: 
X+=Node.W; 
break; 
case 4: 
Y+=Node.H; 
break; 
} 
body.add(0,new Node(X,Y)); 
//---------------去掉蛇尾 
body.remove(body.size()-1); 
} 
} 
} 
//---------組成蛇身的單位，食物 
class Node 
{ 
public static final int W = 20; 
public static final int H = 20; 
int x; 
int y; 
public Node(int x,int y){ 
this.x = x; 
this.y = y; 
} 
} 
//------畫板 
class SnakePanel extends JPanel{ 
Snake snake; 
public SnakePanel(Snake snake){ 
this.snake = snake; 
} 
public void paintComponent(Graphics g){ 
super.paintComponent(g); 
Node node = null; 
for(int i = 0;i < snake.body.size();i++){//---紅藍間隔畫蛇身 
if(i%2 == 0) 
g.setColor(Color.blue); 
else g.setColor(Color.yellow); 
node = snake.body.get(i); 
g.fillRect(node.x,node.y,node.H,node.W);//*******************試用********************* 
} 
node = snake.food; 
g.setColor(Color.red); 
g.fillRect(node.x,node.y,node.H,node.W); 
} 
} 
class SnakeFrame extends JFrame{ 
private JLabel statusLabel; 
private JLabel speedLabel; 
private JLabel scoreLabel; 
private JPanel snakePanel; 
private Snake snake; 
private JMenuBar bar; 
JMenu gameMenu; 
JMenu helpMenu; 
JMenu speedMenu; 
JMenuItem newItem; 
JMenuItem pauseItem; 
JMenuItem beginItem; 
JMenuItem helpItem; 
JMenuItem aboutItem; 
JMenuItem slowItem; 
JMenuItem midItem; 
JMenuItem fastItem; 

public SnakeFrame(){ 
init(); 
ActionListener l = new ActionListener(){ 
public void actionPerformed(ActionEvent e){ 
if(e.getSource()==pauseItem) 
snake.isRun = false; 
if(e.getSource()==beginItem) 
snake.isRun = true; 
if(e.getSource()==newItem) 
{ newGame(); 
} 
//------------菜單控制運行速度 
if(e.getSource()==slowItem) 
{ 
snake.speed = Snake.SLOW; 
speedLabel.setText("Slow"); 
} 
if(e.getSource()==midItem) 
{ 
snake.speed = Snake.MID; 
speedLabel.setText("Mid"); 
} 
if(e.getSource()==fastItem) 
{ 
snake.speed = Snake.FAST; 
speedLabel.setText("Fast"); 
} 
} 
}; 
pauseItem.addActionListener(l); 
beginItem.addActionListener(l); 
newItem.addActionListener(l); 
aboutItem.addActionListener(l); 
slowItem.addActionListener(l); 
midItem.addActionListener(l); 
fastItem.addActionListener(l); 
addKeyListener(new KeyListener(){ 
public void keyPressed(KeyEvent e){ 
switch(e.getKeyCode()){ 
//------------方向鍵改變蛇運行方向 
case KeyEvent.VK_DOWN:// 
snake.changeDerection(Snake.DOWN); 
break; 
case KeyEvent.VK_UP:// 
snake.changeDerection(Snake.UP); 
break; 
case KeyEvent.VK_LEFT:// 
snake.changeDerection(Snake.LEFT); 
break; 
case KeyEvent.VK_RIGHT:// 
snake.changeDerection(Snake.RIGHT); 
break; 
//空格鍵，游戲暫停或繼續 
case KeyEvent.VK_SPACE:// 
if(snake.isRun == true) 
{snake.isRun = false;snake.status = Snake.PAUSED;break;} 
if(snake.isRun == false) 
{snake.isRun = true; snake.status = Snake.RUNNING;break;} 
} 
} 
public void keyReleased(KeyEvent k){ 
} 
public void keyTyped(KeyEvent k){ 
} 
}); 
} 
private void init(){ 
speedLabel = new JLabel(); 
snake = new Snake(); 
setSize(380,460); 
setLayout(null); 
this.setResizable(false); 
bar = new JMenuBar(); 
gameMenu = new JMenu("Game"); 
newItem= new JMenuItem("New Game"); 
gameMenu.add(newItem); 
pauseItem = new JMenuItem("Pause"); 
gameMenu.add(pauseItem); 
beginItem = new JMenuItem("Continue"); 
gameMenu.add(beginItem); 
helpMenu = new JMenu("Help"); 
aboutItem = new JMenuItem("About"); 
helpMenu.add(aboutItem); 
speedMenu = new JMenu("Speed"); 
slowItem = new JMenuItem("Slow"); 
fastItem = new JMenuItem("Fast"); 
midItem = new JMenuItem("Middle"); 
speedMenu.add(slowItem); 
speedMenu.add(midItem); 
speedMenu.add(fastItem); 
bar.add(gameMenu); 
bar.add(helpMenu); 
bar.add(speedMenu); 
setJMenuBar(bar); 
statusLabel = new JLabel(); 
scoreLabel = new JLabel(); 
snakePanel = new JPanel(); 
snakePanel.setBounds(0,0,300,400); 
snakePanel.setBorder(BorderFactory.createLineBorder(Color.darkGray)); 
add(snakePanel); 
statusLabel.setBounds(300,25,60,20); 
add(statusLabel); 
scoreLabel.setBounds(300,20,60,20); 
add(scoreLabel); 
JLabel temp = new JLabel("狀態"); 
temp.setBounds(310,5,60,20); 
add(temp); 
temp = new JLabel("分數"); 
temp.setBounds(310,105,60,20); 
add(temp); 
temp = new JLabel("速度"); 
temp.setBounds(310,55,60,20); 
add(temp); 
speedLabel.setBounds(310,75,60,20); 
add(speedLabel); 
} 
private void newGame(){ 
this.remove(snakePanel); 
this.remove(statusLabel); 
this.remove(scoreLabel); 
speedLabel.setText("Slow"); 
statusLabel = new JLabel(); 
scoreLabel = new JLabel(); 
snakePanel = new JPanel(); 
snake = new Snake(); 
snakePanel = new SnakePanel(snake); 
snakePanel.setBounds(0,0,300,400); 
snakePanel.setBorder(BorderFactory.createLineBorder(Color.darkGray)); 
Runnable r1 = new SnakeRunnable(snake,snakePanel); 
Runnable r2 = new StatusRunnable(snake,statusLabel,scoreLabel); 
Thread t1 = new Thread(r1); 
Thread t2 = new Thread(r2); 
t1.start(); 
t2.start(); 
add(snakePanel); 
statusLabel.setBounds(310,25,60,20); 
add(statusLabel); 
scoreLabel.setBounds(310,125,60,20); 
add(scoreLabel); 
} 

}