Question

想要一个在eclipse上直接运行的贪吃蛇代码

Answer 1

第一个类：
/**
* 代表蛇的运行方向
* @author Administrator
*
*/
public enum Dir {
L, U, R, D
}

第二个类：
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Random;

/**
* 代表蛋
* @author Administrator
*
*/
public class Egg {
int row, col;
int w = Yard.BLOCK_SIZE;
int h = Yard.BLOCK_SIZE;
private static Random r = new Random();
private Color color = Color.GREEN;

public Egg(int row, int col) {
this.row = row;
this.col = col;
}

public Egg() {
this(r.nextInt(Yard.ROWS-2) + 2, r.nextInt(Yard.COLS));
}

public void reAppear() {
this.row = r.nextInt(Yard.ROWS-2) + 2;
this.col = r.nextInt(Yard.COLS);
}

public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
}

public void draw(Graphics g) {
Color c = g.getColor();
g.setColor(color);
g.fillOval(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
g.setColor(c);
if(color == Color.GREEN) color = Color.RED;
else color = Color.GREEN;
}

public int getCol() {
return col;
}

public void setCol(int col) {
this.col = col;
}

public int getRow() {
return row;
}

public void setRow(int row) {
this.row = row;
}

}

第三个类：
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
/**
* 代表蛇
* @author Administrator
*
*/

public class Snake {
private Node head = null;
private Node tail = null;
private int size = 0;

private Node n = new Node(20, 30, Dir.L);
private Yard y;

public Snake(Yard y) {
head = n;
tail = n;
size = 1;
this.y = y;
}

public void addToTail() {
Node node = null;
switch(tail.dir) {
case L :
node = new Node(tail.row, tail.col + 1, tail.dir);
break;
case U :
node = new Node(tail.row + 1, tail.col, tail.dir);
break;
case R :
node = new Node(tail.row, tail.col - 1, tail.dir);
break;
case D :
node = new Node(tail.row - 1, tail.col, tail.dir);
break;
}
tail.next = node;
node.prev = tail;
tail = node;
size ++;
}

public void addToHead() {
Node node = null;
switch(head.dir) {
case L :
node = new Node(head.row, head.col - 1, head.dir);
break;
case U :
node = new Node(head.row - 1, head.col, head.dir);
break;
case R :
node = new Node(head.row, head.col + 1, head.dir);
break;
case D :
node = new Node(head.row + 1, head.col, head.dir);
break;
}
node.next = head;
head.prev = node;
head = node;
size ++;
}

public void draw(Graphics g) {
if(size <= 0) return;
move();
for(Node n = head; n != null; n = n.next) {
n.draw(g);
}
}

private void move() {
addToHead();
deleteFromTail();
checkDead();
}

private void checkDead() {
if(head.row < 2 || head.col < 0 || head.row > Yard.ROWS || head.col > Yard.COLS) {
y.stop();
}

for(Node n = head.next; n != null; n = n.next) {
if(head.row == n.row && head.col == n.col) {
y.stop();
}
}
}

private void deleteFromTail() {
if(size == 0) return;
tail = tail.prev;
tail.next = null;

}

private class Node {
int w = Yard.BLOCK_SIZE;
int h = Yard.BLOCK_SIZE;
int row , col;
Dir dir = Dir.L;
Node next = null;
Node prev = null;

Node(int row, int col, Dir dir) {
this.row = row;
this.col = col;
this.dir = dir;
}

void draw(Graphics g) {
Color c = g.getColor();
g.setColor(Color.BLACK);
g.fillRect(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
g.setColor(c);
}
}

public void eat(Egg e) {
if(this.getRect().intersects(e.getRect())) {
e.reAppear();
this.addToHead();
y.setScore(y.getScore() + 5);
}
}

private Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * head.col, Yard.BLOCK_SIZE * head.row, head.w, head.h);
}

public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
switch(key) {
case KeyEvent.VK_LEFT :
if(head.dir != Dir.R)
head.dir = Dir.L;
break;
case KeyEvent.VK_UP :
if(head.dir != Dir.D)
head.dir = Dir.U;
break;
case KeyEvent.VK_RIGHT :
if(head.dir != Dir.L)
head.dir = Dir.R;
break;
case KeyEvent.VK_DOWN :
if(head.dir != Dir.U)
head.dir = Dir.D;
break;
}
}
}

第四个类：
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
* 这个类代表贪吃蛇的活动场所
* @author bjsxt
* @version 1.0
*/
public class Yard extends Frame {

PaintThread paintThread = new PaintThread();
private boolean gameOver = false; //游戏是否结束

/**
* 行数
*/
public static final int ROWS = 30;
public static final int COLS = 30;
public static final int BLOCK_SIZE = 15;

private Font fontGameOver = new Font("宋体", Font.BOLD, 50);

private int score = 0;

Snake s = new Snake(this);
Egg e = new Egg();

Image offScreenImage = null;

public void launch() {
this.setLocation(200, 200);
this.setSize(COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
this.addWindowListener(new WindowAdapter() {

@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}

});
this.setVisible(true);
this.addKeyListener(new KeyMonitor());

new Thread(paintThread).start();
}

public static void main(String[] args) {
new Yard().launch();
}

public void stop() {
gameOver = true;
}

@Override
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.GRAY);
g.fillRect(0, 0, COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
g.setColor(Color.DARK_GRAY);
//画出横线
for(int i=1; i<ROWS; i++) {
g.drawLine(0, BLOCK_SIZE * i, COLS * BLOCK_SIZE, BLOCK_SIZE * i);
}
for(int i=1; i<COLS; i++) {
g.drawLine(BLOCK_SIZE * i, 0, BLOCK_SIZE * i, BLOCK_SIZE * ROWS);
}

g.setColor(Color.YELLOW);
g.drawString("score:" + score, 10, 60);

if(gameOver) {
g.setFont(fontGameOver);
g.drawString("游戏结束", 120, 180);

paintThread.pause();
}

g.setColor(c);

s.eat(e);
e.draw(g);
s.draw(g);

}

@Override
public void update(Graphics g) {
if(offScreenImage == null) {
offScreenImage = this.createImage(COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
}
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage, 0, 0, null);
}

private class PaintThread implements Runnable {
private boolean running = true;
private boolean pause = false;
public void run() {
while(running) {
if(pause) continue;
else repaint();

try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

public void pause() {
this.pause = true;
}

public void reStart() {
this.pause = false;
s = new Snake(Yard.this);
gameOver = false;
}

public void gameOver() {
running = false;
}

}

private class KeyMonitor extends KeyAdapter {

@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if(key == KeyEvent.VK_F2) {
paintThread.reStart();
}
s.keyPressed(e);
}

}

/**
* 拿到所得的分数
* @return 分数
*/

public int getScore() {
return score;
}

/**
* 设置所得的分数
* @param score 分数
*/

public void setScore(int score) {
this.score = score;
}

}

仅供参考。