tory320

Design Principle
Identify the aspects of your application that vary and separate them from what stays the same.
Here's another way to think about this principle: take the parts that vary and encapsulate them, so that later you can alter or extends the parts that vary without affecting those that don't.
As simple as this concept is, it forms the basis for almost every design pattern. All patterns provide a way to let some part of a system vary independently of all other parts.

Each set of class will hold all the implementations of their respective behavior. For instance, we might have one clss that implements quarking, another implements squaking, and another that implements silence.

To separate thest behaviors from the Duck class, we'll pull both methods out of the duck class and create a new set of class to represent each behavior.

This is in contrast to the way we were doing things before, where a behavior either came from a concrete implementation in the suprerclass Duck, or by providing a specialized implementation in the sub class itself. In both cases we were relying on an implementation. We were locked into using that specific implemetation and there was no room for changing out the behavior.

And the same is true for the duck's flying behavior.

Okay, now that we've done the deep dive on the duck simulator design, it's time to come back up for air and take a look at the big picture.

Below is the entire reworked class structure. We have everything you'd expect: ducks extending Duck. fly behavior implementing FlyBehavior and quack behavior implementing QuackBehavior.

Notice also that we've started to describe things a little differntly. Instead of thinking of the duck behaviors as a set of behaviors, we'll start thinking of them ad a family of algorithms. Think about it: in the SimUDuck design, the algorithms represent things a duck would do , but we could just as easily use the same techniques for a set of classes that implement the ways to compute state sales tax by different states.

/**
?* //FileOperate.java
?* 文件的各種操作
?* 楊彩 http://blog.sina.com.cn/m/yangcai
?* 文件操作 1.0
?*/
?
//package common;
?
import java.io.*;
?
public class FileOperate
{
?static boolean exitnow=false;
?static String aa,bb;
? public FileOperate() {
? }
?
? /**
?? * 新建目錄
?? */
? public void newFolder(String folderPath) {
??? try
??? {
????? String filePath = folderPath;
????? filePath = filePath.toString();
????? File myFilePath = new File(filePath);
????? if(!myFilePath.exists())
????? {
??????? myFilePath.mkdir();
????? }
????? System.out.println("新建目錄操作 成功執行");
??? }
??? catch(Exception e)
??? {
????? System.out.println("新建目錄操作出錯");
????? e.printStackTrace();
??? }
? }
?
? /**
?? * 新建文件
?? */
? public void newFile(String filePathAndName, String fileContent)
? {
?
??? try
??? {
????? String filePath = filePathAndName;
????? filePath = filePath.toString();
????? File myFilePath = new File(filePath);
????? if (!myFilePath.exists())
????? {
??????? myFilePath.createNewFile();
????? }
????? FileWriter resultFile = new FileWriter(myFilePath);
????? PrintWriter myFile = new PrintWriter(resultFile);
????? String strContent = fileContent;
????? myFile.println(strContent);
????? resultFile.close();
????? System.out.println("新建文件操作 成功執行");
??? }
??? catch (Exception e) {
????? System.out.println("新建目錄操作出錯");
????? e.printStackTrace();
?
??? }
?
? }
?
? /**
?? * 刪除文件
?? */
? public void delFile(String filePathAndName) {
??? try {
????? String filePath = filePathAndName;
????? filePath = filePath.toString();
????? File myDelFile = new File(filePath);
????? myDelFile.delete();
????? System.out.println("刪除文件操作 成功執行");
??? }
??? catch (Exception e) {
????? System.out.println("刪除文件操作出錯");
????? e.printStackTrace();
?
??? }
?
? }
?
? /**
?? * 刪除文件夾
?? */
? public void delFolder(String folderPath)
? {
??? try
??? {
????? delAllFile(folderPath); //刪除完里面所有內容
????? String filePath = folderPath;
????? filePath = filePath.toString();
????? File myFilePath = new File(filePath);
????? myFilePath.delete(); //刪除空文件夾
????? System.out.println("刪除文件夾操作 成功執行");
??? }
??? catch (Exception e)
??? {
????? System.out.println("刪除文件夾操作出錯");
????? e.printStackTrace();
?
??? }
?
? }
?
? /**
?? * 刪除文件夾里面的所有文件
?? * @param path String 文件夾路徑 如 c:/fqf
?? */
? public void delAllFile(String path)
? {
??? File file = new File(path);
??? if(!file.exists())
??? {
????? return;
??? }
??? if(!file.isDirectory())
??? {
????? return;
??? }
??? String[] tempList = file.list();
??? File temp = null;
??? for (int i = 0; i < tempList.length; i++)
??? {
????? if(path.endsWith(File.separator))
????? {
??????? temp = new File(path + tempList[i]);
????? }
????? else
????? {
??????? temp = new File(path + File.separator + tempList[i]);
????? }
????? if (temp.isFile())
????? {
??????? temp.delete();
????? }
????? if (temp.isDirectory())
????? {
??????? delAllFile(path+"/"+ tempList[i]);//先刪除文件夾里面的文件
??????? delFolder(path+"/"+ tempList[i]);//再刪除空文件夾
????? }
??? }
????????? System.out.println("刪除文件操作 成功執行");?
? }
?
? /**
?? * 復制單個文件
?? * @param oldPath String 原文件路徑 如：c:/fqf.txt
?? * @param newPath String 復制后路徑 如：f:/fqf.txt
?? */
? public void copyFile(String oldPath, String newPath) {
??? try {
????? int bytesum = 0;
????? int byteread = 0;
????? File oldfile = new File(oldPath);
????? if (oldfile.exists())
????? { //文件存在時
??????? InputStream inStream = new FileInputStream(oldPath); //讀入原文件
??????? FileOutputStream fs = new FileOutputStream(newPath);
??????? byte[] buffer = new byte[1444];
??????? int length;
??????? while ( (byteread = inStream.read(buffer)) != -1) {
????????? bytesum += byteread; //字節數 文件大小
????????? System.out.println(bytesum);
????????? fs.write(buffer, 0, byteread);
??????? }
??????? inStream.close();
????? }
??????????? System.out.println("刪除文件夾操作 成功執行");?
??? }
??? catch (Exception e) {
????? System.out.println("復制單個文件操作出錯");
????? e.printStackTrace();
?
??? }
?
? }
?
? /**
?? * 復制整個文件夾內容
?? * @param oldPath String 原文件路徑 如：c:/fqf
?? * @param newPath String 復制后路徑 如：f:/fqf/ff
?? */
? public void copyFolder(String oldPath, String newPath) {
?
??? try
??? {
????? (new File(newPath)).mkdirs(); //如果文件夾不存在 則建立新文件夾
????? File a=new File(oldPath);
????? String[] file=a.list();
????? File temp=null;
????? for (int i = 0; i < file.length; i++)
????? {
??????? if(oldPath.endsWith(File.separator))
??????? {
????????? temp=new File(oldPath+file[i]);
??????? }
??????? else{
????????? temp=new File(oldPath+File.separator+file[i]);
??????? }
?
??????? if(temp.isFile())
??????? {
????????? FileInputStream input = new FileInputStream(temp);
????????? FileOutputStream output = new FileOutputStream(newPath + "/" +
????????????? (temp.getName()).toString());
????????? byte[] b = new byte[1024 * 5];
????????? int len;
????????? while ( (len = input.read(b)) != -1)
????????? {
??????????? output.write(b, 0, len);
????????? }
????????? output.flush();
????????? output.close();
????????? input.close();
??????? }
??????? if(temp.isDirectory())
??????? {//如果是子文件夾
????????? copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
??????? }
????? }
??????????? System.out.println("復制文件夾操作 成功執行");?
??? }
??? catch (Exception e) {
????? System.out.println("復制整個文件夾內容操作出錯");
????? e.printStackTrace();
?
??? }
?
? }
?
? /**
?? * 移動文件到指定目錄
?? * @param oldPath String 如：c:/fqf.txt
?? * @param newPath String 如：d:/fqf.txt
?? */
? public void moveFile(String oldPath, String newPath) {
??? copyFile(oldPath, newPath);
??? delFile(oldPath);
?
? }
?
? /**
?? * 移動文件到指定目錄
?? * @param oldPath String 如：c:/fqf.txt
?? * @param newPath String 如：d:/fqf.txt
?? */
? public void moveFolder(String oldPath, String newPath) {
??? copyFolder(oldPath, newPath);
??? delFolder(oldPath);
?
? }
?
? public static void main(String args[])
? {
? ?System.out.println("使用此功能請按[1]? 功能一：新建目錄");
? ?System.out.println("使用此功能請按[2]? 功能二：新建文件");
? ?System.out.println("使用此功能請按[3]? 功能三：刪除文件");
? ?System.out.println("使用此功能請按[4]? 功能四：刪除文件夾");
? ?System.out.println("使用此功能請按[5]? 功能五：刪除文件夾里面的所有文件");
? ?System.out.println("使用此功能請按[6]? 功能六：復制文件");
? ?System.out.println("使用此功能請按[7]? 功能七：復制文件夾的所有內容");
? ?System.out.println("使用此功能請按[8]? 功能八：移動文件到指定目錄");
? ?System.out.println("使用此功能請按[9]? 功能九：移動文件夾到指定目錄");
? ?System.out.println("使用此功能請按[10] 退出程序");
? ?
?while(!exitnow)
?{
? ??FileOperate fo=new FileOperate();
? ??try
? ??{
? ??BufferedReader Bin=new BufferedReader(new InputStreamReader(System.in));
? ??String a=Bin.readLine();
? ??int b=Integer.parseInt(a);
? ??
? ??switch(b)
? ??{
? ???case 1:System.out.println("你選擇了功能一? 請輸入目錄名");??
? ????? aa=Bin.readLine();
? ????? fo.newFolder(aa);
? ????? break;
? ???case 2:System.out.println("你選擇了功能二? 請輸入文件名");??
? ????? aa=Bin.readLine();
? ????? System.out.println("請輸入在"+aa+"中的內容");
? ????? bb=Bin.readLine();
? ????? fo.newFile(aa,bb);
? ????? break;
? ???case 3:System.out.println("你選擇了功能三? 請輸入文件名");??
? ????? aa=Bin.readLine();
? ????? fo.delFile(aa);
? ????? break;
? ???case 4:System.out.println("你選擇了功能四? 請輸入文件名");??
? ????? aa=Bin.readLine();
? ????? fo.delFolder(aa);
? ????? break;
? ???case 5:System.out.println("你選擇了功能五? 請輸入文件名");??
? ????? aa=Bin.readLine();
? ????? fo.delAllFile(aa);
? ????? break;??
? ???case 6:System.out.println("你選擇了功能六? 請輸入文件名");??
? ????? aa=Bin.readLine();
? ????? System.out.println("請輸入目標文件名");?
? ????? bb=Bin.readLine();
? ????? fo.copyFile(aa,bb);
? ????? break;
? ???case 7:System.out.println("你選擇了功能七? 請輸入源文件名");??
? ????? aa=Bin.readLine();
? ????? System.out.println("請輸入目標文件名");?
? ????? bb=Bin.readLine();
? ????? fo.copyFolder(aa,bb);
? ????? break;? ?????
? ???case 8:System.out.println("你選擇了功能八? 請輸入源文件名");??
? ????? aa=Bin.readLine();
? ????? System.out.println("請輸入目標文件名");?
? ????? bb=Bin.readLine();
? ????? fo.moveFile(aa,bb);
? ????? break;
? ??? ?case 9:System.out.println("你選擇了功能九? 請輸入源文件名");??
? ????? aa=Bin.readLine();
? ????? System.out.println("請輸入目標文件名");?
? ????? bb=Bin.readLine();
? ????? fo.moveFolder(aa,bb);
? ????? break;? ?????
? ???case 10:exitnow=true;
? ?????? System.out.println("程序結束，請退出");
? ????? break;
? ???default:System.out.println("輸入錯誤.請輸入1-10之間的數");?? ???? ????? ?
? ?? }
? ??
? ??
? ??System.out.println("請重新選擇功能");
? ??
? ??
? ??}
? ??catch(Exception e)
? ??{
? ??System.out.println("輸入錯誤字符或程序出錯");
? ??}
? ??
?}? ?
?}
}