Java swing 写的贪吃蛇代码200行

刚学完书上java的swing，无聊做个贪吃蛇练练， 200多行的代码也写了好几个小时 0.0！



代码整体分成三块：

* greedySnackMain：框架类

* snackWin: 面板类，这里主要就是对面板进行操作。

* Snack:蛇类

思想很简单：绘制完框架，新建一个线程让蛇跑起来就可以了。

//类greedySnackMain
package GreedySnack;

import javax.swing.JFrame;

public class greedySnackMain extends JFrame {
snackWin snackwin;
static final int Width = 800 , Height = 600 , LocX = 200 , LocY = 80;
public greedySnackMain() {
super("GreedySncak_SL");
snackwin = new snackWin();
add(snackwin);
this.setSize(Width, Height);
this.setVisible(true);
this.setLocation(LocX, LocY);
//snackwin.requestFocus();
}
public static void main(String[] args) {
new greedySnackMain();
}
}

//类snackWin
package GreedySnack;

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JButton;
import javax.swing.JPanel;

public class snackWin extends JPanel implements ActionListener, KeyListener {
static final int Up = 0 , Down = 1 , Left = 2 , Right = 3;
static final int GameLocX = 50 , GameLocY = 50 , GameWidth = 700 , GameHeight = 500 , Size = 10;
static int rx , ry , score = 0 , speed = 5;
boolean startFlag = false;
JButton startButton , stopButton , quitButton;
Snack snack;
public snackWin() {
snack = new Snack();
rx = (int)(Math.random() * (GameWidth - 10) + GameLocX);
ry = (int)(Math.random() * (GameHeight - 10) + GameLocY);
startButton = new JButton("开始");
stopButton = new JButton("暂停");
quitButton = new JButton("退出");
setLayout(new FlowLayout(FlowLayout.LEFT));
this.add(startButton);
this.add(stopButton);
this.add(quitButton);
startButton.addActionListener(this);
stopButton.addActionListener(this);
quitButton.addActionListener(this);
this.addKeyListener(this);
new Thread(new snackThread()).start();
}
public void paint(Graphics g)
{
super.paint(g);   //没有会将button刷掉
g.setColor(Color.white);
g.fillRect(GameLocX, GameLocY, GameWidth, GameHeight);  //刷新界面
g.setColor(Color.black);
g.drawRect(GameLocX, GameLocY, GameWidth, GameHeight);  //绘制边界
g.drawString("Score: " + score + "        Speed: " + speed + "      速度最大为100" , 250, 25);
g.setColor(Color.green);
g.fillRect(rx, ry, 10, 10);   //食物
snack.draw(g);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == startButton) {
startFlag = true;
startButton.setEnabled(false);
stopButton.setEnabled(true);
}
if(e.getSource() == stopButton) {
startFlag = false;
startButton.setEnabled(true);
stopButton.setEnabled(false);
}
if(e.getSource() == quitButton) {
System.exit(0);
}
this.requestFocus();
}
public void keyPressed(KeyEvent e) {
//System.out.println(e.getKeyCode());
if(!startFlag) return ;
switch(e.getKeyCode()) {
case KeyEvent.VK_UP:
if(snack.length() != 1 && snack.getDir() == Down) break;
snack.changeDir(Up);
break;
case KeyEvent.VK_DOWN:
if(snack.length() != 1 && snack.getDir() == Up) break;
snack.changeDir(Down);
break;
case KeyEvent.VK_LEFT:
if(snack.length() != 1 && snack.getDir() == Right) break;
snack.changeDir(Left);
break;
case KeyEvent.VK_RIGHT:
if(snack.length() != 1 && snack.getDir() == Left) break;
snack.changeDir(Right);
break;
}
}
public void keyReleased(KeyEvent e) {}
public void keyTyped(KeyEvent e) {}

class snackThread implements Runnable
{
public void run() {
while(true) {
try {
Thread.sleep(100 - speed >= 0 ? 100 - speed : 0);
repaint();
if(startFlag) {
snack.move();
}
}
catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}
}

//类snack
package GreedySnack;

import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;

class Node {
private int x , y;
public Node() {}
public Node(int a , int b) {x = a; y = b;}
public Node(Node tmp) {x = tmp.getX(); y = tmp.getY();}
int getX() {return x;}
int getY() {return y;}
void setX(int a) {x = a;}
void setY(int b) {y = b;}
}
public class Snack {
static final int DIR[][] = {{0 , -1} , {0 , 1} , {-1 , 0} , {1 , 0}};
private List<Node> lt = new ArrayList<Node>();
private int curDir;
public Snack() {
curDir = 3;
lt.add(new Node(350 , 250));
}
int length() {return lt.size();}
int getDir() {return curDir;}
void draw(Graphics g)
{
g.setColor(Color.black);
for(int i = 0; i < lt.size(); i++) {
g.fillRect(lt.get(i).getX(), lt.get(i).getY(), 10, 10);
}
}
boolean Dead() {
for(int i = 1; i < lt.size(); i++) {
if(lt.get(0).getX() == lt.get(i).getX() && lt.get(0).getY() == lt.get(i).getY())
return true;
}
return false;
}
Node headMove()
{
int tx = lt.get(0).getX() + snackWin.Size * DIR[curDir][0];
int ty = lt.get(0).getY() + snackWin.Size * DIR[curDir][1];
if(tx > snackWin.GameLocX + snackWin.GameWidth - snackWin.Size) tx = snackWin.GameLocX;
if(tx < snackWin.GameLocX) tx = snackWin.GameWidth + snackWin.GameLocX - snackWin.Size;
if(ty > snackWin.GameLocY + snackWin.GameHeight - snackWin.Size) ty = snackWin.GameLocY;
if(ty < snackWin.GameLocY) ty = snackWin.GameHeight + snackWin.GameLocY - snackWin.Size;
Node tmp = new Node(tx, ty);
return tmp;
}
void move()
{
Node head = headMove() , newNode = new Node();
boolean eat = false;
if(Math.abs(head.getX() - snackWin.rx) < 10 && Math.abs(head.getY() - snackWin.ry) < 10) {
eat = true;
newNode = new Node(lt.get(lt.size() - 1));
snackWin.rx = (int)(Math.random() * (snackWin.GameWidth - 10) + snackWin.GameLocX);
snackWin.ry = (int)(Math.random() * (snackWin.GameHeight - 10) + snackWin.GameLocY);
}
for(int i = lt.size() - 1; i > 0; i--)
lt.set(i, lt.get(i - 1));
lt.set(0, head);
if(Dead()) {
JOptionPane.showMessageDialog(null, "Snake eating itself", "Message", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
if(eat) {
lt.add(newNode);
snackWin.score++;
snackWin.speed++;
}
}
void changeDir(int dir) {curDir = dir;}
}