PBO-9 Implementasi Design Class World of Zuul

Laporan mata kuliah Pemrograman Berorientasi Objek (A) - Pertemuan 9

Nama: Nabil Irawan

NRP: 5025241231

Kelas: Pemrograman Berorientasi Objek (A)

fajarbaskoro: PBO - Desain Class - Kopling Kohesifajarbaskoro

Laporan

Membuat aplikasi untuk Implementasi Design Class

Pada laporan ini saya telah berhasil mengimplementasikan game World of Zuul. Aplikasi menjadi modul-modul yang kecil untuk memastikan bahwa modul yang dirancang menganut prinsip "Loose Coupling, High Cohesion".

Command.java

Code:

class Command {
    private String commandWord;
    private String secondWord;

    public Command(String firstWord, String secondWord) {
        commandWord = firstWord;
        this.secondWord = secondWord;
    }

    public String getCommandWord() {
        return commandWord;
    }

    public String getSecondWord() {
        return secondWord;
    }

    public boolean isUnknown() {
        return (commandWord == null);
    }

    public boolean hasSecondWord() {
        return (secondWord != null);
    }
}

CommandWords.java

Code:

class CommandWords {
    private static final String validCommands[] = {
        "go", "quit", "help", "look"
    };

    public CommandWords() {
    }

    public boolean isCommand(String aString) {
        for (int i = 0; i < validCommands.length; i++) {
            if (validCommands[i].equals(aString))
                return true;
        }
        return false;
    }
}

Game.java

Code:

class Game {
    private Parser parser;
    private Room currentRoom;

    public Game() {
        createRooms();
        parser = new Parser();
    }

    private void createRooms() {
        Room outside, theatre, pub, lab, office;

        outside = new Room("outside the main entrance of the university");
        theatre = new Room("in a lecture theatre");
        pub = new Room("in the campus pub");
        lab = new Room("in a computing lab");
        office = new Room("in the computing admin office");

        outside.setExits(null, theatre, lab, pub);
        theatre.setExits(null, null, null, outside);
        pub.setExits(null, outside, null, null);
        lab.setExits(outside, office, null, null);
        office.setExits(null, null, null, lab);

        currentRoom = outside;
    }

    public void play() {
        printWelcome();

        boolean finished = false;
        while (!finished) {
            Command command = parser.getCommand();
            finished = processCommand(command);
        }
        System.out.println("Thank you for playing. Good bye.");
    }

    private void printWelcome() {
        System.out.println();
        System.out.println("Welcome to Adventure!");
        System.out.println("Adventure is a new, incredibly boring adventure game.");
        System.out.println("Type 'help' if you need help.");
        System.out.println();
        System.out.println("You are " + currentRoom.getDescription());
        System.out.print("Exits: ");
        if (currentRoom.northExit != null)
            System.out.print("north ");
        if (currentRoom.eastExit != null)
            System.out.print("east ");
        if (currentRoom.southExit != null)
            System.out.print("south ");
        if (currentRoom.westExit != null)
            System.out.print("west ");
        System.out.println();
    }

    private boolean processCommand(Command command) {
        boolean wantToQuit = false;

        if (command.isUnknown()) {
            System.out.println("I don't know what you mean...");
            return false;
        }

        String commandWord = command.getCommandWord();
        if (commandWord.equals("help"))
            printHelp();
        else if (commandWord.equals("go"))
            goRoom(command);
        else if (commandWord.equals("quit"))
            wantToQuit = quit(command);

        return wantToQuit;
    }

    private void printHelp() {
        System.out.println("You are lost. You are alone. You wander");
        System.out.println("around at the university.");
        System.out.println();
        System.out.println("Your command words are:");
        System.out.println("  go quit help");
    }

    private void goRoom(Command command) {
        if (!command.hasSecondWord()) {
            System.out.println("Go where?");
            return;
        }

        String direction = command.getSecondWord();

        Room nextRoom = null;
        if (direction.equals("north"))
            nextRoom = currentRoom.northExit;
        if (direction.equals("east"))
            nextRoom = currentRoom.eastExit;
        if (direction.equals("south"))
            nextRoom = currentRoom.southExit;
        if (direction.equals("west"))
            nextRoom = currentRoom.westExit;

        if (nextRoom == null)
            System.out.println("There is no door!");
        else {
            currentRoom = nextRoom;
            System.out.println("You are " + currentRoom.getDescription());
            System.out.print("Exits: ");
            if (currentRoom.northExit != null)
                System.out.print("north ");
            if (currentRoom.eastExit != null)
                System.out.print("east ");
            if (currentRoom.southExit != null)
                System.out.print("south ");
            if (currentRoom.westExit != null)
                System.out.print("west ");
            System.out.println();
        }
    }

    private boolean quit(Command command) {
        if (command.hasSecondWord()) {
            System.out.println("Quit what?");
            return false;
        } else
            return true;
    }
}

Parser.java

Code:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

class Parser {
    private CommandWords commands;

    public Parser() {
        commands = new CommandWords();
    }

    public Command getCommand() {
        String inputLine = "";
        String word1;
        String word2;

        System.out.print("> ");

        BufferedReader reader =
            new BufferedReader(new InputStreamReader(System.in));
        try {
            inputLine = reader.readLine();
        } catch (java.io.IOException exc) {
            System.out.println("There was an error during reading: "
                               + exc.getMessage());
        }

        StringTokenizer tokenizer = new StringTokenizer(inputLine);

        if (tokenizer.hasMoreTokens())
            word1 = tokenizer.nextToken();
        else
            word1 = null;
        if (tokenizer.hasMoreTokens())
            word2 = tokenizer.nextToken();
        else
            word2 = null;

        if (commands.isCommand(word1))
            return new Command(word1, word2);
        else
            return new Command(null, word2);
    }
}

Room.java

Code:

class Room {
    public String description;
    public Room northExit;
    public Room southExit;
    public Room eastExit;
    public Room westExit;

    public Room(String description) {
        this.description = description;
    }

    public void setExits(Room north, Room east, Room south, Room west) {
        if (north != null)
            northExit = north;
        if (east != null)
            eastExit = east;
        if (south != null)
            southExit = south;
        if (west != null)
            westExit = west;
    }

    public String getDescription() {
        return description;
    }
}

Proof

Done.