Tạo project cho các bạn mới học và cả cao nhân

Chào mọi người, lần trước mình có làm cái video nhưng do hệ thống quay của mình cứ lỗi liên tục nên mình cũng đành bó tay . Hôm nay mình ngồi viết code thì nãy ra ý tưởng này cho các anh em newbie (các bạn mới học) và xin các góp ý từ cao nhân luôn. . Mình tạo một project mã nguồn mở về Shell (bạn nào hứng thú thì cứ viết code chung luôn ).
Đây là mã nguồn project của mình (viết bằng java):
Project: TrueShell
File:TrueShell.java

/**True Corporation
*True Java Development Office
*
*TrueShell Project - a shell console application
*Begin in 22 Jan 2016
*Developer: Pham Quoc Hung
*/

//TrueShell - Runtime, traffic and main class

package tdp;

import java.util.*;
import static java.lang.Thread.sleep;


public class TrueShell {
    
    public static void main(String[] args) throws Exception {
        Scanner Read = new Scanner (System.in);
        fileiolib fLib = new fileiolib();
        stdiolib stdio = new stdiolib();
        String cmd = "";
        String[] key;
        String skey;
        System.out.println ("True Corporation @ 2016");
        System.out.println ("TrueShell Workscape version 0.1$b");
        System.out.println ("=================================");
        System.out.println ("Loading Libraries..."); sleep(1500);
        System.out.println ("Ready");
        while (!cmd.equals("exit")) {
            System.out.print   ("$_/> ");
            cmd = Read.next();
            switch (cmd){
                case "echo" : {
                    skey = Read.nextLine();
                    stdio.echo(skey);
                } break;
                case "exit" : stdio.$sys_exit(); break;      
                case "end" : stdio.$sys_exit(); break;
                case "mkOut" : stdio.$sys_exit(); break;
                case "mkExit" : stdio.$sys_exit(); break;
                case "$wtf_end" : stdio.$sys_exit(); break;
                case "plus" : {
                    int a = Read.nextInt();
                    int b = Read.nextInt();
                    stdio.plus(a,b);
                } break;
                case "//" : String cmt = Read.nextLine(); break;
                case "crt_f" : {
                    skey = Read.nextLine();
                    fLib.mkFile(skey);
                } break;
                case "crt_d" : {
                    skey=Read.nextLine();
                    fLib.mkFol(skey);
                } break;
                case "del_f" : {
                    skey = Read.nextLine();                    
                    if(skey.equals("")) {                     
                        fLib.delFile();
                    } else fLib.delFile(skey);
                } break;
                case "del_d" : {
                    skey = Read.nextLine();
                    if(skey.equals("")) {
                        fLib.delFol(); }
                    else fLib.delFol(skey);
                    } break;     
                case "dir_f~get" : {
                    fLib.getfileDir(); break;
                }
                default: stdio.$er_wrong();
            }
        }        
    }    
}

File:fileiolib.java

//TrueShell Project Source code
//fileiolib - File and disk storage system interactivities Library

package tdp;

import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;

public class fileiolib {
    private File file, folder;
    private String dir, foldir;
    void mkFile(String filedir) {
        file = new File(filedir);
        dir = filedir;
        System.out.println (dir);
        try {
            file.createNewFile();
        } catch (IOException ex) {
            Logger.getLogger(fileiolib.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println("This command has been stopped immerdiately because some reasons");
        }
    }
    void mkFol (String filedir){
        folder = new File(filedir);
        folder.mkdir();
        foldir = filedir;
    }
    void delFile() {
        if (dir != null) {
        file = new File(dir);
        file.delete();
        System.out.println(dir+" has been deleted");
        dir = null;
        } else System.out.println("File created define not found");
    }
    void delFile(String filedir) {
        file = new File(filedir);
        file.delete();
        System.out.println(filedir + " has been deleted");
    }
    void delFol () {
        if (foldir != null) {
            folder = new File(foldir);
            folder.delete();
            System.out.println (foldir + " has been deleted");
            foldir = null;
        } else System.out.println("Folder created define not found");
    }
    void delFol (String filedir) {
        folder = new File (filedir);
        folder.delete();
        System.out.println(filedir + " has been deleted");
    }
    void getfileDir () throws IOException {
        file = new File("test.vf");
        file.createNewFile();
        System.out.println(file.getPath());  //tc
        System.out.println(file.getParent()); //tcd
    }
}

File: stdiolib.java

//TrueShell Project Source Code - Core libraries
//stdiolib - Core library of base commands and analyzers

package tdp;

import static java.lang.Thread.sleep;

public class stdiolib {
    
    void echo(String text){
        System.out.println (text);
    }   
    void plus(int a,int b) {
        System.out.println(a+b);
    }
    void $er_wrong() {
        System.out.println ("Wrong command or the library contain it is not imported.");
    }
    void $sys_exit() throws InterruptedException {
        System.out.println("Closing and unloading loaded packages and libraries...");
        System.out.println("Good bye");  sleep(750); System.exit(0);
    } 
}