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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£¬ºÁÃë¼¶
double speedChangeRate = 0.75; //ÿ´ÎµÄËٶȱ仯ÂÊ
boolean isPaused = false ;//ÔÝÍ£±êÖ¾

int score = 0; //µÃ·Ö
int countMove = 0; //³Ôµ½Ê³ÎïÇ°ÒÆ¶¯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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CREATE OR REPLACE PROCEDURE TESTA(PARA1 IN VARCHAR2,PARA2 IN VARCHAR2)  AS
BEGIN
   INSERT INTO HYQ.B_ID (I_ID,I_NAME) VALUES (PARA1, PARA2);
END TESTA;
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import java.util.*;
import java.text.*;
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File   f=new   File("DerectoryName");      
  String   []results=f.list();   
  
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Java Éè¼ÆÄ£Ê½(12)

Observer
Intent
Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
How to
Subject
  
knows its observers. Any number of Observer objects may observe a subject.
  
provides an in ......
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