public class Game
{
private Parser parser;
private Room currentRoom;
/**
* Create the game and initialise its internal map.
*/
public Game()
{
createRooms();
parser = new Parser();
}
/**
* Create all the rooms and link their exits together.
*/
private void createRooms()
{
Room outside, theatre, pub, lab, office;
// create the rooms
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");
// initialise room exits
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; // start game outside
}
/**
* Main play routine. Loops until end of play.
*/
public void play()
{
printWelcome();
// Masuk ke main command loop. Kita akan berulang kali membaca perintah dan
// menjalankannya sampai game selesai
boolean finished = false;
while (! finished) {
Command command = parser.getCommand();
finished = processCommand(command);
}
System.out.println("Thank you for playing. Good bye.");
}
/**
* Print out the opening message for the player
*/
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();
}
/**
* Given a command, process (that is: execute) the command.
* If this command ends the game, true is returned,
* otherwise false is returned.
*/
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;
}
// implementations of user commands:
/**
* Print out some help information.
* Here we print some stupid, cryptic
* message and a list of the command words
*/
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");
}
/**
* Try to go to one direction. If there is an exit, enter
* the new room, otherwise print an error message
*/
private void goRoom(Command command)
{
if(!command.hasSecondWord()) {
// if there is no second word, we don\'t know where to go...
System.out.println("Go where?");
return;
}
String direction = command.getSecondWord();
// Try to leave current room.
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();
}
}
/**
* "Quit" was entered. Check the rest of the command to see
* whether we really quir the game. Return true if this command
* quits the game, false otherwise.
*/
private boolean quit(Command command)
{
if(command.hasSecondWord()) {
System.out.println("Quit what?");
return false;
}
else
return true; // signal that we want to quit
}
}