Zuul_Bad hra, příkaz 'back' – Java – Fórum – Programujte.com

Dobrý den, 

chtěl bych Vás poprosit, jestli by mi někdo nemohl pomoc vymyslet jak, aby fungovalo stále dokola příkaz 'back'. Pro vysvětlení, hráč se pohybuje světem, vždy začíná v oblasti 'outside' poté může chodit možnými směry (south, north, up, down,....) příkazem 'go' a posouvá se do dalších místností, já jsem do toho vložil příkaz 'back' s tím, že se vrátí do té předchozí místnosti, ale funguje mi to pouze vždy jednou a poté zůstává v té jedné vracené místnosti. Já bych chtěl, aby se vracel cestou, kterou chtěl, třeba až na začátek. Děkuji za odpověď. Doufám, že jste to trochu pochopili.  

package zuul_bad_zeman;

import zuul_bad_zeman.Parser;
import zuul_bad_zeman.Command;

public class Game {

    private Parser parser;
    private Room currentRoom;
    private Room previousRoom;

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

    private void createRooms() {
        Room outside, theater, pub, lab, office, shop, hotel, shopSecondFloor, library, underground, pubRoof;

        outside = new Room("outside", "outside the main entrance of the university");
        theater = new Room("theater", "in a lecture theater");
        pub = new Room("pub", "in the campus pub");
        lab = new Room("lab", "in a computing lab");
        office = new Room("office", "in the computing admin office");
        shop = new Room("shop", "in a shop, we have a good CocaCola");
        hotel = new Room("hotel", "in a hotel, WELCOME!");
        shopSecondFloor = new Room("shopSecondFloor", "in second floor in the shop");
        library = new Room("library", "in library there are awesome books");
        underground = new Room("underground","in the underground campus ground");
        pubRoof = new Room("pubRoof", "in the pub roof");
        
        outside.setExit("north", shop);
        outside.setExit("east", theater);
        outside.setExit("south", lab);
        outside.setExit("west", pub);
        theater.setExit("east", library);
        theater.setExit("west", outside);
        pub.setExit("east", outside);
        pub.setExit("west", hotel);
        lab.setExit("north", outside);
        lab.setExit("east", office);
        office.setExit("west", lab);
        shop.setExit("south", outside);
        shop.setExit("up", shopSecondFloor);
        hotel.setExit("east", pub);
        shopSecondFloor.setExit("down", shop);
        library.setExit("west", theater);
        pub.setExit("up", pubRoof);
        outside.setExit("down", underground);
        underground.setExit("up", outside);
        pubRoof.setExit("down", pub);
        
        currentRoom = outside; //začátek hry
    }

    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 the World of Zuul!");
        System.out.println("World of Zuul is a new, incredibly boring adventure game.");
        System.out.println("Type 'help' if you need help.");
        System.out.println(currentRoom.whereYouAre());
    }

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

        if (command.isUnknown()) {
            System.out.println("I don't know what you mean...");
            System.out.println("Please, be careful.");
            System.out.println(currentRoom.whereYouAre());
            return false;
        }

        String commandWord = command.getCommandWord();
        if (commandWord.equals("help")) {
            printHelp();
        }
        else if (commandWord.equals("go")) {
            goRoom(command);
        }
        else if (commandWord.equals("back")) {
            back(command);
        }
        else if (commandWord.equals("look")) {
            doLook();
        }
        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 back look help quit");
        System.out.println(currentRoom.whereYouAre());        
    }

    private void goRoom(Command command) {

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

        String direction = command.getSecondWord();

        Room nextRoom = currentRoom.getExit(direction);

        if (nextRoom == null) {
            System.out.println("There is no door!");
            System.out.println("Please, be careful.");
            System.out.println(currentRoom.whereYouAre());
            
        } else {
            previousRoom = currentRoom;
            currentRoom = nextRoom;
            System.out.println(currentRoom.whereYouAre());
        }
    }
    
    private void doLook(){
	   System.out.println(currentRoom.lookYouAre());
	}
    
    private boolean quit(Command command) {
        if (command.hasSecondWord()) {
            System.out.println("Quit what?");
            return false;
        } else {
            return true;
        }
    }

    private void back(Command command) {
        
        if (command.hasSecondWord()) {
            System.out.print("I don't know what you mean...\n");
            System.out.println("Try it again");
            System.out.println(currentRoom.whereYouAre());
            return;
        }
        
        if (previousRoom == null) {
            System.out.print("Sorry you can't go back\n");
            System.out.println(currentRoom.whereYouAre());
            return;
        }
        currentRoom = previousRoom;

        System.out.println(currentRoom.whereYouAre());
    }
}

Ahoj, při vejití do místnosti si vždy pamatuješ pouze tu předchozí a ta předchozí se přepíše vždy v další místnosti. Neboli si to pamatuje vždy jen 1 předchozí místnost. Místo toho musíš použít pro historii místností pole. Například Stack https://docs.oracle.com/javase/7/docs/api/java/util/Stack.html

Pro tebe pak budou klíčové metody pop (vrací poslední prvek ze stacku a smaže ho z něj) a push (vloží prvek na konec pole).

#2 Naemos čau, asi chápu, jak to myslíš. ale nevím jak to mám zapsat, ze zásobníkem, jsem zatím ještě nepracoval, nemohl bys mi trochu více poradit? 

#2 Naemos
Mělo by to vypadat, nějak takto? 

package zuul_bad_zeman;

import java.util.Stack;
/**
 *
 * @author Martin Zeman
 */
public class Zasobnik {
    private Prvek vrchol;
	
    private class Prvek {
      int klic;
      Prvek dalsi;

      Prvek (int klic, Prvek dalsi) {
        this.klic = klic;
        this.dalsi = dalsi;
      }
    }

    Zasobnik() {
      vrchol = null;
    }

    boolean jePrazdny() { 
      return (vrchol == null);
    }
  
    void push(int klic) {
      vrchol = new Prvek(klic, vrchol);
    }

    int pop() {
      int v = vrchol.klic;
      vrchol = vrchol.dalsi;
      return v;
    }
  }

Vložil jsem to do té hra jako třídu, ale nevím co mám vložit za vrchol, klic, dalsi. Jestli vůbec je to dobře, děkuji za radu.

Mohlo by to fungovat, ale na co ti bude zásobník na inty a proč nepoužiješ ten odkazovaný hotový?!

Stack<Room> path = new Stack<Room>();

goRoom:

	path.push(currentRoom);
	currentRoom = nextRoom;

goBack:

	if (!path.empty()) {
		currentRoom = path.pop();
	}

#5 q
Omlouvám se, ale prostě furt nevím kam to vložit, aby to fungovalo ať to zkouším jak to zkouším, tak to nejde. Mohl by někdo poradit? Děkuji. 

Aha, už nic chápu, ale mám jeden problém nechce mi to vzít ten 'path'? 

Co jsem udělal špatně, že mi teď nechce příkaz 'back' fungovat vůbec? 

package zuul_bad_zeman;

import java.util.Stack;
import zuul_bad_zeman.Parser;
import zuul_bad_zeman.Command;

public class Game {

    private Parser parser;
    private Room currentRoom;
    private Room nextRoom;
    private Room previousRoom;
    Stack<Room> path = new Stack<Room>();

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

    private void createRooms() {
        Room outside, theater, pub, lab, office, shop, hotel, shopSecondFloor, library, underground, pubRoof;

        outside = new Room("outside", "outside the main entrance of the university");
        theater = new Room("theater", "in a lecture theater");
        pub = new Room("pub", "in the campus pub");
        lab = new Room("lab", "in a computing lab");
        office = new Room("office", "in the computing admin office");
        shop = new Room("shop", "in a shop, we have a good CocaCola");
        hotel = new Room("hotel", "in a hotel, WELCOME!");
        shopSecondFloor = new Room("shopSecondFloor", "in second floor in the shop");
        library = new Room("library", "in library there are awesome books");
        underground = new Room("underground","in the underground campus ground");
        pubRoof = new Room("pubRoof", "in the pub roof");
        
        outside.setExit("north", shop);
        outside.setExit("east", theater);
        outside.setExit("south", lab);
        outside.setExit("west", pub);
        theater.setExit("east", library);
        theater.setExit("west", outside);
        pub.setExit("east", outside);
        pub.setExit("west", hotel);
        lab.setExit("north", outside);
        lab.setExit("east", office);
        office.setExit("west", lab);
        shop.setExit("south", outside);
        shop.setExit("up", shopSecondFloor);
        hotel.setExit("east", pub);
        shopSecondFloor.setExit("down", shop);
        library.setExit("west", theater);
        pub.setExit("up", pubRoof);
        outside.setExit("down", underground);
        underground.setExit("up", outside);
        pubRoof.setExit("down", pub);
        
        currentRoom = outside; //začátek hry
    }

    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 the World of Zuul!");
        System.out.println("World of Zuul is a new, incredibly boring adventure game.");
        System.out.println("Type 'help' if you need help.");
        System.out.println(currentRoom.whereYouAre());
    }

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

        if (command.isUnknown()) {
            System.out.println("I don't know what you mean...");
            System.out.println("Please, be careful.");
            System.out.println(currentRoom.whereYouAre());
            return false;
        }

        String commandWord = command.getCommandWord();
        if (commandWord.equals("help")) {
            printHelp();
        }
        else if (commandWord.equals("go")) {
            goRoom(command);
        }
        else if (commandWord.equals("back")) {
            back(command);
        }
        else if (commandWord.equals("look")) {
            doLook();
        }
        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 back look help quit");
        System.out.println(currentRoom.whereYouAre());        
    }

    private void goRoom(Command command) {

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

        String direction = command.getSecondWord();
        
        Room nextRoom = currentRoom.getExit(direction);
        
        path.push(currentRoom);
	currentRoom = nextRoom;

        if (nextRoom == null) {
            System.out.println("There is no door!");
            System.out.println("Please, be careful.");
            System.out.println(currentRoom.whereYouAre());
            
        } else {
            previousRoom = currentRoom;
            currentRoom = nextRoom;
            System.out.println(currentRoom.whereYouAre());
        }
    }
    
    private void doLook(){
	   System.out.println(currentRoom.lookYouAre());
	}
    
    private boolean quit(Command command) {
        if (command.hasSecondWord()) {
            System.out.println("Quit what?");
            return false;
        } else {
            return true;
        }
    }
    
    
    private void back(Command command) {
        
        
        if (command.hasSecondWord()) {
            System.out.print("I don't know what you mean...\n");
            System.out.println("Try it again");
            System.out.println(currentRoom.whereYouAre());
            return;
        }
         if (previousRoom == null) {
            System.out.print("Sorry you can't go back\n");
            System.out.println(currentRoom.whereYouAre());
            return;  
        }
        if (!path.empty()) {
           currentRoom = path.pop();
	}
        
         currentRoom = previousRoom;
                System.out.println(currentRoom.whereYouAre());
         
        }
      }

To jsi tam neměl vložit, ale přepsat na podobnou logiku.

private void goRoom(Command command) {

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

	String direction = command.getSecondWord();

	Room nextRoom = currentRoom.getExit(direction);

	if (nextRoom == null) {
		System.out.println("There is no door!");
		System.out.println("Please, be careful.");
		System.out.println(currentRoom.whereYouAre());
	} else {
		path.push(currentRoom);
		currentRoom = nextRoom;
		System.out.println(currentRoom.whereYouAre());
	}
}
    
    
private void back(Command command) {
        
	if (command.hasSecondWord()) {
		System.out.print("I don't know what you mean...\n");
		System.out.println("Try it again");
		System.out.println(currentRoom.whereYouAre());
		return;
	}

	if (path.empty()) {
		System.out.print("Sorry you can't go back\n");
		System.out.println(currentRoom.whereYouAre());
		return;  
	}

	currentRoom = path.pop();
	System.out.println(currentRoom.whereYouAre());
}

Díky, moc q. :-) Uzavřete téma. Děkuji.