Using inheritance for the World of Zuul project, create a TransporterRoom class

Question

Using inheritance for the World of Zuul project, create a TransporterRoom class that inherits the Room class and transports you to another room

Some pieces of code that may help:

import java.util.Scanner;

public class Game
{
private Room currentRoom;
  
public Game()
{
createRooms();
}

/**
* Create all the rooms and link their exits together.
*/
private void createRooms()
{
Room outside, theater, teleport;

// create the rooms
outside = new Room("outside *burp* the main entrance *burp* of the university");
theater = new Room("in a lecture theater");
teleport = new Room("in my space cruiser");

// initialise room exits
outside.setExit("east", theater);
theater.setExit("west", outside);
outside.setExit("north", teleport);
teleport.setExit("south", outside);

currentRoom = outside; //start game outside
}

/**
* Given a command, process (that is: execute) the command.
* @param command The command to be processed.
* @return true If the command ends the game, false otherwise.
*/
private boolean processCommand(Command command)
{
boolean wantToQuit = false;

CommandWord commandWord = command.getCommandWord();

switch (commandWord) {
case UNKNOWN:
System.out.println("I don't know what you mean...");
break;

case GO:
goRoom(command);
setRoom();
break;
}
return wantToQuit;
}

/**
*Sets the current room for player if the description of
*the current location matches the room
*/
private void setRoom()
{
String str = currentRoom.getShortDescription().toString();

if (!(str.equals(null)))
{
       if (str.equals("in a lecture theater"))
           player.setCurrentRoom("theater");

       else if (str.equals("outside *burp* the main entrance *burp* of the university"))
           player.setCurrentRoom("outside");

       else if (str.equals("in my space cruiser"))
       {
       player.setCurrentRoom("teleport");
       }
       }

       else
           return;
}

/**
* Try to go in a direction. If there is an exit, enter the new
* room, otherwise print an error message.
* @param command User input the direction desired
*/
private void goRoom(Command command)
{
String direction = command.getSecondWord();

// Try to leave current room.
Room nextRoom = currentRoom.getExit(direction);

currentRoom = nextRoom;
  
}
}

import java.util.Set;
import java.util.HashMap;

public class Room
{
private String description;
public HashMap<String, Room> exits; // stores "exits" of Room class

/**
* Create a room
* @param description The room's description
*/
public Room(String description)
{
this.description = description;
exits = new HashMap<>();
}

public void setExit(String direction, Room neighbor)
{
exits.put(direction, neighbor);
}

public String getShortDescription()
{
return description;
}

public Room getExit(String direction)
{
return exits.get(direction);
}
}

Explanation / Answer

Ans:

Programs:

// TransporterRoom.java //

public class TransporterRoom extends Room // inheritance(extends) room

{

private Scenario scene;

// Create a room that can beam you anywhere.

public TransporterRoom(String description, Scenario scene)

{

super(description);

this.scene = scene;

}   

// Exits

// clear exits

private String getExitString()

{

return "You feel quite dizzy. Something is strange. " +

"You cannot really see the exits...";

}   

// Return the room that is reached if we go from this room in direction

//direction-- return null ff there is no room in that direction

public Room getExit(String direction)

{

return scene.getRandomRoom();

}

}

// end //

room.java

// this you can use as example room //

import java.util.Set;

import java.util.HashMap;

// import util_iterator

import java.util.Iterator;

// room_class

class Room

{

// String_Descrptn

private String description;

// exits- hash_map

private HashMap exits; // stores_exits of room.

public Room(String description)

{

this.description = description;

exits = new HashMap();

}

// exit

public void setExit(String direction, Room neighbor)

{

exits.put(direction, neighbor);

}

public String getShortDescription()

{

return description;

}

public String getLongDescription()

{

return "You are " + description + ". " + getExitString();

}

private String getExitString()

{

String returnString = "Exits:";

Set keys = exits.keySet();

for(Iterator iter = keys.iterator(); iter.hasNext(); )

returnString += " " + iter.next();

return returnString;

}

public Room getExit(String direction)

{

return (Room)exits.get(direction);

}

}

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