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1.SnakeModel.java
import java.util.Observable;
import java.util.LinkedList;
import java.util.Arrays;
import java.util.Random;
import javax.swing.*;
//ObservableÀàÒ»°ã´ú±íÊý¾Ý£¬ÊµÏÖ½Ó¿ÚRunnable±íÃ÷´´½¨Ò»¸ö½ø³Ì
public class SnakeModel extends Observable implements Runnable {

boolean[][] matrix; //ָʾλÖÃÉÏÊÇ·ñÓÐÉßÌå»òʳÎ
LinkedList nodeArray = new LinkedList(); //ÉßÌå

Node food;
int maxX; //XÖá±ßÏߣ¬¼´Îª»­²¼ÖÐXÖá¸öÊý
int maxY; //yÖá±ßÏߣ¬¼´Îª»­²¼ÖÐYÖá¸öÊý
int direction = UP; //ÉßÔËÐеķ½Ïò,³õʼΪÏòÉÏ£¨UP£©
boolean isRunning = false; //ÔËÐÐ״̬

int timeInterval = 200; //ʱ¼ä¼ä¸ô£¬ºÁÃ뼶
double speedChangeRate = 0.75; //ÿ´ÎµÄËٶȱ仯ÂÊ
boolean isPaused = false ;//ÔÝÍ£±êÖ¾

int score = 0; //µÃ·Ö
int countMove = 0; //³Ôµ½Ê³ÎïÇ°Òƶ¯µÄ´ÎÊý

public static final int UP = 2;
public static final int DOWN =4;
public static final int LEFT= 1;
public static final int RIGHT =3;

public SnakeModel(int maxX, int maxY){

this.maxX = maxX;
this.maxY = maxY;
reset();
}

public void reset(){

direction = SnakeModel.UP;
timeInterval = 200;
isPaused = false;
score = 0;
countMove = 0;

//³õʼ»¯¾ØÕó
matrix = new boolean[maxX][];
for(int i = 0; i < maxX; ++i){
//¹ØÓÚÊý×éµÄн¨
matrix[i] = new boolean[maxY];
Arrays.fill(matrix[i],false);
}

//³õʼ»¯ÉßÌå
//³õʼÉßÌ峤¶È°´ÕÕºáÖáµÄ³¤¶È£¬ÈôºáÖá>20,ÔòÉßÌ峤¶ÈΪ10£¬·ñÔòΪºáÖáÒ»°ë
int initArrayLength = maxX > 20 ? 10 : maxX / 2;
nodeArray.clear();
for(int i = 0; i < initArrayLength; ++i){
int x = maxX / 2;
int y = maxY / 2;
nodeArray.addLast(new Node(x, y));
matrix[x][y] = true;
}

//´´½¨Ê³Îï
food = createFood();
matrix[food.x][food.y] = true;
}

public void changeDirection(int newDirection){
//¸Ä±ä·½Ïò²»ÄÜÓëÔ­·½ÏòͬÏò»ò·´Ïò
if((direction & 1


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