A proof of concept class showing that it's easy to replicate the Windows command line interface.

Console.java

package fr.neatmonster.console;

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.UIManager;

/*
 * MM'""""'YMM                                     dP          
 * M' .mmm. `M                                     88          
 * M  MMMMMooM .d8888b. 88d888b. .d8888b. .d8888b. 88 .d8888b. 
 * M  MMMMMMMM 88'  `88 88'  `88 Y8ooooo. 88'  `88 88 88ooood8 
 * M. `MMM' .M 88.  .88 88    88       88 88.  .88 88 88.  ... 
 * MM.     .dM `88888P' dP    dP `88888P' `88888P' dP `88888P' 
 * MMMMMMMMMMM                                                 
 */
/**
 * A proof of concept class showing that it's easy to replicate the Windows command line interface.
 * 
 * @author NeatMonster.
 */
public class Console {
    /** The special characters allowed in the console. */
    private static final String SPECIAL_CHARACTERS = " ²&~\"#'{([|`_\\^@)°]=+}€^¨$£¤ù%*µ<>,?;.:!§/*-+";

    /**
     * The method called when the application starts.
     * 
     * @param args
     *            the arguments
     */
    public static void main(final String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    final Console console = new Console();
                    console.frame.setVisible(true);
                } catch (final Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    private String      consoleText      = "";
    private File        currentDirectory = new File(System.getProperty("user.home"));
    private int         cursorDisplayed  = 0;
    private boolean     cursorEnabled    = false;
    private int         cursorPosition   = 0;
    private JFrame      frame;
    private JScrollPane scrollPane;
    private JTextArea   textArea;
    private Timer       timer;
    private String      userText         = "";

    /**
     * Instantiates a new console.
     */
    public Console() {
        initialize();
    }

    /**
     * Adds the specified character to the console.
     * 
     * @param c
     *            the caracter
     */
    public void addCharacter(final String c) {
        String userText = this.userText + c;
        if (cursorEnabled && cursorPosition < this.userText.length()) {
            userText = this.userText.substring(0, cursorPosition) + c;
            if (cursorPosition < this.userText.length() - 1)
                userText += this.userText.substring(cursorPosition, this.userText.length());
        }
        this.userText = userText;
        cursorPosition++;
        update();
    }

    /**
     * Simulate an user pressing backspace.
     */
    public void backspace() {
        if (cursorPosition > 0) {
            String userText = this.userText.substring(0, cursorPosition - 1);
            if (cursorPosition < this.userText.length() - 1)
                userText += this.userText.substring(cursorPosition, this.userText.length());
            this.userText = userText;
            if (cursorPosition > 0)
                cursorPosition--;
            update();
        }
    }

    /**
     * Simulate an user pressing delete.
     */
    public void delete() {
        if (cursorEnabled && cursorPosition < userText.length()) {
            String userText = this.userText.substring(0, cursorPosition);
            if (cursorPosition < this.userText.length() - 1)
                userText += this.userText.substring(cursorPosition + 1, this.userText.length());
            this.userText = userText;
            update();
        }
    }

    /**
     * Handle a key event.
     * 
     * @param e
     *            the event
     */
    public void handleKeyEvent(final KeyEvent e) {
        if ((e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK && e.getKeyCode() != KeyEvent.VK_LEFT
                && e.getKeyCode() != KeyEvent.VK_RIGHT)
            return;
        if (e.getKeyChar() == '\n') {
            cursorEnabled = false;
            final String userText = this.userText;
            println(userText);
            this.userText = "";
            if (!userText.isEmpty()) {
                String[] args = userText.trim().replaceAll(" {2,}", " ").split(" ");
                if (args.length > 0) {
                    final String command = args[0];
                    if (args.length == 1)
                        args = new String[0];
                    else
                        args = Arrays.copyOfRange(args, 1, args.length);
                    if (command.equalsIgnoreCase("cd")) {
                        if (args.length > 0) {
                            final File currentDirectory = this.currentDirectory.toPath().resolve(args[0]).normalize().toFile();
                            if (currentDirectory.exists() && currentDirectory.isDirectory()) {
                                this.currentDirectory = currentDirectory;
                            } else
                                println("Le chemin d'accès spécifié est introuvable.");
                        } else
                            try {
                                println(currentDirectory.getCanonicalPath());
                            } catch (final Exception e1) {
                                println(currentDirectory.getAbsolutePath());
                            }
                        println("");
                    } else if (command.equalsIgnoreCase("exit")) {
                        int status = 0;
                        if (args.length > 0)
                            try {
                                status = Integer.parseInt(args[0]);
                            } catch (final Exception e1) {
                            }
                        System.exit(status);
                    } else {
                        println("'" + command + "' n'est pas reconnu en tant que commande interne");
                        println("ou externe, un programme exécutable ou un fichier de commandes.");
                        println("");
                    }
                }
            }
            requestUserInput();
        } else if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
            if (cursorPosition > 0) {
                e.consume();
                backspace();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_DELETE) {
            if (cursorPosition < userText.length()) {
                e.consume();
                delete();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_LEFT && (e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK) {
            if (cursorPosition > 0) {
                e.consume();
                cursorPosition = userText.substring(0, cursorPosition - 1).lastIndexOf(" ") >= 0 ? userText.substring(0, cursorPosition - 1)
                        .lastIndexOf(" ") + 1 : 0;
                cursorDisplayed = 0;
                update();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            if (cursorPosition > 0) {
                cursorPosition--;
                cursorDisplayed = 0;
                update();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_RIGHT && (e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK) {
            if (cursorPosition < userText.length() - 1) {
                e.consume();
                cursorPosition += userText.substring(cursorPosition + 1, userText.length()).indexOf(" ") >= 0 ? userText.substring(
                        cursorPosition + 1, userText.length()).indexOf(" ") + 2 : userText.substring(cursorPosition + 1, userText.length()).length();
                cursorDisplayed = 0;
                update();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            if (cursorPosition < userText.length()) {
                cursorPosition++;
                cursorDisplayed = 0;
                update();
            }
        } else if (e.getKeyCode() == KeyEvent.VK_HOME) {
            cursorPosition = 0;
            cursorDisplayed = 0;
            update();
        } else if (e.getKeyCode() == KeyEvent.VK_END) {
            cursorPosition = userText.length();
            cursorDisplayed = 0;
            update();
        } else if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
            userText = "";
            cursorPosition = 0;
            cursorDisplayed = 0;
            update();
        } else if (Character.isUnicodeIdentifierPart(e.getKeyChar()) || SPECIAL_CHARACTERS.contains(Character.toString(e.getKeyChar())))
            addCharacter(Character.toString(e.getKeyChar()));
    }

    /**
     * Initialize the console.
     */
    public void initialize() {
        initializeFrame();
        initializeTimer();
        initializeTextArea();
        initializeScrollPane();
    }

    /**
     * Initialize the frame.
     */
    public void initializeFrame() {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        } catch (final Exception e) {
        }
        frame = new JFrame();
        final int width = 675;
        final int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
        final int height = 342;
        final int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
        frame.setBounds((screenWidth - width) / 2, (screenHeight - height) / 2, width, height);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Administateur : C:\\Windows\\system32\\cmd.exe");
        final ArrayList<Image> icons = new ArrayList<Image>();
        icons.add(new ImageIcon(getClass().getResource("/resources/cmd_x16.png")).getImage());
        icons.add(new ImageIcon(getClass().getResource("/resources/cmd_x32.png")).getImage());
        icons.add(new ImageIcon(getClass().getResource("/resources/cmd_x48.png")).getImage());
        icons.add(new ImageIcon(getClass().getResource("/resources/cmd_x256.png")).getImage());
        frame.setIconImages(icons);
        frame.setResizable(false);
    }

    /**
     * Initialize the scrollpane.
     */
    public void initializeScrollPane() {
        scrollPane = new JScrollPane(textArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        frame.setContentPane(scrollPane);
    }

    /**
     * Initialize the text area.
     */
    public void initializeTextArea() {
        textArea = new JTextArea();
        textArea.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(final KeyEvent e) {
                handleKeyEvent(e);
            }
        });
        textArea.setEditable(false);
        textArea.setBackground(Color.BLACK);
        textArea.setForeground(Color.WHITE);
        textArea.setFont(new Font("Lucida Console", Font.PLAIN, 13));
        textArea.setLineWrap(true);
        println("Microsoft Windows [version 6.1.7601]");
        println("Copyright (c) 2009 Microsoft Corporation. Tous droits réservés.");
        println("");
        requestUserInput();
    }

    /**
     * Initialize the timer responsible for the blinking cursor.
     */
    public void initializeTimer() {
        timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                if (cursorEnabled) {
                    cursorDisplayed = (cursorDisplayed + 1) % 4;
                    update();
                }
            }
        }, 0L, 250L);
    }

    /**
     * Prints the String on the console.
     * 
     * @param s
     *            the string to print
     */
    public void print(final String s) {
        consoleText += s;
        update();
    }

    /**
     * Print the screen to the console and add a new line.
     * 
     * @param s
     *            the string to print
     */
    public void println(final String s) {
        print(s + "\n");
    }

    /**
     * Request an input of the user.
     */
    public void requestUserInput() {
        try {
            print(currentDirectory.getCanonicalPath() + ">");
        } catch (final Exception e) {
            print(currentDirectory.getAbsolutePath() + ">");
        }
        cursorEnabled = true;
        cursorDisplayed = 0;
        cursorPosition = 0;
        userText = "";
    }

    /**
     * Update the console display.
     */
    public synchronized void update() {
        String userText = this.userText;
        if (cursorEnabled) {
            if (cursorDisplayed < 3) {
                userText = this.userText.substring(0, cursorPosition) + "_";
                if (cursorPosition < this.userText.length() - 1)
                    userText += this.userText.substring(cursorPosition + 1, this.userText.length());
            }
        }
        textArea.setText(consoleText + userText);
    }
}