Застрял на виртуальном зоопарке

Question

Я занимаюсь виртуальным зоопарком в области информатики, и я застрял. Мы используем руководство для навигации по зоопарку, но я не могу понять, как обойтись без ошибок. Когда я запускаю его он говорит: «Null! Null, и я понятия не имею, что делать. Я не являюсь довольно новым для кодирования спасибо вам за вашу помощь.

class Guide { 
private String name; 
int Selection; 
int Selection1; 
int Selection3; 
int Selection2; 
int choice; 
Scanner inputScanner = new Scanner (System.in); 

void welcomeusertozoo() { 

     System.out.println("Hello! Welcome to Cringe Jarin! A Zoo full of cringy creative creatures. Im Fred. What is your Cringy Name?"); 
name = inputScanner.next(); 
System.err.println("Ewww..... How cringy. Well, Welcome " + name + "! What creatures would you like to visit First?" 
     + "\n 1.Ogres" 
     + "\n 2.Vampires" 
     + "\n 3.Rats \n\n"); 
choice = inputScanner.nextInt(); 
    creatureselection(choice); 
} 

void creatureselection(int Selection) { 

    switch (Selection) { 

     case 1: System.out.println("Plug up the nose and close those eyes! These creatures are Ugly! who Would you Like to visit...\n Please press 1 to go meet the commander himself, Ogre E Lee. \n Please press 2 to go meet the one and only Ogrewall Jackson. \n Please press 3 to meet the wonderful Mr.GreenBean. \n Please press 4 to meet the rebellious William Shrallace. \n\n"); 
      choice = inputScanner.nextInt(); 

     switch (choice){ 
      case 1: System.out.println("Commander Ogre. E Lee Here! \n\n"); 
      case 2: System.out.println("This is the impeccable, the amazing, one and only Ogrewall Jackson \n\n"); 
      break; 
      case 3: System.out.println("This is the fashionable, the sexy, the fabulous GreenBean \n\n"); 
      break; 
      case 4: System.out.println("This is the free, the bravest heart I know, the impecable William Shrallace \n\n"); 
      default: System.out.println("We do not have a creature under that selection at the moment. Please choose 1 or 2 or 3 \n\n"); 

     } 

     break; 


     case 2:System.out.println("Dont have a scarf? Oh.... watch your necks! Who would you like to visit...\n Please press 1 to go meet the spooky Dio. \n Please press 2 to go meet the truly bone chilling Diego. \n Please press 3 to meet the bloodthirsty Big White Bat. \n Please press 4 to meet the Bold Mubat. \n\n"); 
     choice = inputScanner.nextInt(); 
     switch (choice){ 
      case 1: System.out.println("Dio \n\n"); creatureselection(2); 
       break; 
      case 2: System.out.println("Diego \n\n"); creatureselection(2); 
       break; 
      case 3: System.out.println("Big White bat \n\n"); creatureselection(2); 
       break; 
      case 4: System.out.println("Bold Mubat \n\n"); creatureselection(2); 
       break; 
       default: System.out.println("We do not have a creature under that selection at the moment. Please choose 1 or 2 or 3 \n\n"); 
      creatureselection(2); 
     } 


     break; 


     case 3:System.out.println("Pull out the Cheese but dont let it rip! These creatures are Cringy! Who would you like to visit...\n Please press 1 to go meet the Odd Ratty Weisau. \n Please press 2 to go meet the backstabbing Risa. \n Please press 3 to meet the permanently sad Dindin. \n Please press 4 to meet the sketchy Markymouse. \n\n"); 
     choice = inputScanner.nextInt(); 
     switch (choice) { 
      case 1: System.out.println("Ratty Weisau \n\n"); creatureselection(3); 
       break; 
      case 2: System.out.println("Risa \n\n"); creatureselection(3); 
       break; 
      case 3: System.out.println("Dindin \n\n"); creatureselection(3); 
       break; 
      case 4: System.out.println("Markymouse \n\n"); creatureselection(3); 
       break; 
       default: System.out.println("We do not have a creature under that selection at the moment. Please choose 1 or 2 or 3 \n\n"); 
      creatureselection(3); 
     } 
      break; 
     default: System.out.println("We do not have a creature under that selection at the moment. Please choose 1 or 2 or 3 \n\n"); 
      creatureselection(1); 


    } 



} 
void setName(String fred) { 

} 

}

Answer 1

Что, кажется, проблема? Можете ли вы предоставить более подробную информацию о том, что это проблема. это, кажется, работает.

вы создаете объект Guide?

public class test { 
    public static void main(String[] args) { 
     Guide guide = new Guide(); 
     guide.welcomeusertozoo(); 
    } 
} 

После этого все, кажется, работает. Просто убедитесь, что у вас есть перерывы в каждом случае, чтобы обеспечить согласованность. Надеюсь, я помог.

Answer 2

Это главное:

public class ZooProject { 

public static void main(String[] args) { 

    Rat RattyWiseau = new Rat(); 
    Ogre OgreELee = new Ogre(); 
    Vampire Dio = new Vampire();  
    Guide Fredtheguide = new Guide(); 




    //ask user for name 
    RattyWiseau.setName("Ratty Wiseau"); 
    Dio.setName("Dio"); 
    // Fredtheguide.setName("Fred"); 
    OgreELee.setName("Ogre E Lee"); 
    Fredtheguide.welcomeusertozoo(); 
    System.out.println(OgreELee.getName()); 

} 

}