Hello :
I have this question and I solve the half of it I wont your help in other codes..
We have do a code for every commend ... In this project you will develop many commands that are related to file operations, as in the following list (red colors):
1.pwd: to print the current working directory, i.e, where are you now in the file system.
2.dir [file1/dir1 file2/dir2 etc]: to list the files/subfolders of one or more file/subfolder. In case fName is file then the file information such as (name (use getName method under File) and size (use length method) ) will be listed. In case the file does not exist the message "file/folder was not found". [Hint: under File class there is a method: listFiles which list all the files/subfolders of a given folder]
3.rename oldName newName: to rename a file/folder with new name/folder
4.more file1 [file2][file3] ...: to display the contents of one or more files
5.copy file1 file2: to make new copy of file1 to one or more destinations. In case any of the destination file names exist a confirmation from the user for overwriting should be requested before copying.
6.Append file1 file2 dest: to append/combine source files file1 and file2 in one file dest. In case dest does exist, a confirmation from the user for overwriting should be granted first.
7.findstr word file: to search a word in a file. Each line that contains the word in the file should be displayed along with the line number.
8.Del file1 [file2 ...]: to delete one or more file/directory from the file system.
9.mkdir folder1 [, folder2, etc.]: to create one or more folders.
10.touch file1 [file2 etc..]: to create a new empty file file1 (file2, etc...)
11.help [command]: to display the usage of all command [ or specific one].
12.bye : to exit the program
13.exit: to exit the program
I want numbers 2,3,5,6,9,10,11
Ihis is what I have done...
public abstract class AbstractCommand{
protected String commandName;
protected String[] parameters;
public AbstractCommand(){}
public AbstractCommand(String name, String[] params){
this.commandName = name;
this.parameters = params;
}
public abstract void execute();
public abstract String usage();
}
public class PWD extends AbstractCommand{
public PWD(String name, String[] params){
super(name,params);
}
public void execute(){
File f = new File( "."); // current directory is represented by .
System.out.println( f.getAbsolutePath());
}
public String usage(){
return "pwd : to print the current working directory";
}
}
public class More extends AbstractCommand{
//constructor
public More(String name, String[] params){
super(name,params);
}
//implement the method execute
public void execute(){
if(this.parameters.length == 0){
usage();
return;
}
for(String fn : this.parameters){
File f = new File(fn);
if(f.exists()) displayFile(f);
else
System.out.println("file" + fn + " was not found...");
}
}
public void displayFile(File file){
//write code to open and display the lines of text file
}
public String usage(){
return "more file1 [file2] [file3] ... : to display one or more files";
}
}
public class Exit extends AbstractCommand{
public Exit(String name, String[] params){
super(name,params);
}
public void execute(){
System.out.println(“bye…”);
System.exit(0);
}
public String usage(){
return "exit/bye : to exit";
}
}
Public class Dispatcher{
private String commandName;
private String[] parameters;
public Dispatcher(String cmd){
/*
use String.split or Scanner class to extract the command Name and the
list of paramters.
for example the parameter cmd might be: MORE abc.txt hello.txt
you need to parse cmd such that the value of command name is “more”, and the
list of parameters are [ abc.txt, hello.txt]
*/
}
// provide a method getCommand Object
public AbstractCommand getCommandObj(){
if(commandName.equalsIgnoreCase(“more”)
return new More(this.commandName, this.parameters);
else if(commandName.equalsIgnoreCase("dir"))
return new DIR(this.commandName,this.parameters);
// more commands to be added accordingly
else return null;
}
}
Public class CommandPrompt{
Private Scanner scanner = new Scanner( System.in);
public void start(){
Dispatcher dispatcher =null;
AbstractCommand cmdObj =null;
while(true){
System.out.println(“>>”);
String commandLine = getCommand();
dispatcher = new Dispatcher( commandLine);
cmdObj = dispatcher.getCommandObj();
if(cmdObj == null){
System.out.println("command not found...");
}else{
cmdObj.execute();
}
}
}
// getting commands from the user
public String getCommand(){
return scanner.nextLine();
}
public static void main(String[] args){
CommandPrompt cmd = new CommandPrompt();
cmd.start();
}
}
This is the work I have done....
please help me ... I really need your help
please reply as soon as possible
