Very Simple Problem-- Need help in method selection process

Question

Hello,
It's difficult to explain the background of the program I am making-- but I am stuck at a very simple problem, that I can only solve with a very long block of if statements:
I have 3 possible numbers-- 1, 2, or 3.
Imagine two numbers are already taken-- say 1 and 2. I want a variable to set itself to the number that's not taken (3).
So, again: If two numbers were taken say 2 or 3-- I want the variable to be sent to the other one that isn't taken-- 1.
Thank you for your help,
Evan.

Answer 1

Actually, I'll just tell you the context of the program-- here is what I have so far:
This program is meant to simulate Monty Hall Problem:
http://en.wikipedia.org/wiki/Monty_Hall_problem
The program sets up an array of three possible values. Each one of those values represents a door with either a goat or a car behind it. It then randomly sets one of those values to 1 (in order to represent a car as per the Monty Hall problem), and 0's represent goats.
The user, which is simulated by the program (does not involve actual interaction), chooses a door initially.
The game show hosts then reveals a door that is not the users initial choice, but IS a goat ( an array value of 0).
For example if the array was [0][0][1]
The user could pick door one (array position 0). Which is a goat.
The game show host then reveals a goat that is not the users choice-- which would be array position 1.
After the game show host reveals the goat-- I want the user to always switch his decision to the only other remaining door that was not his first choice.
Then I wanted the computer to test to see if his final choice is the one with a car. And to tally up the amount of times he got it right.
--Sorry that was long winded:
import TerminalIO.*;//imports TerminalIO package for system.out.println
import java.util.*;//import java.util for random
public class Monty_Problem
     int doors[]= {0,0,0};
     Random rand= new Random();
     double wins,totals=0;
     public void carAssignment()
          int car_door= rand.nextInt(3);
          doors[car_door]=1;
     public int judgesChoice(int judgeDoor, int initialChoice)
          if(judgeDoor != initialChoice && doors[judgeDoor]!=1)
               return judgeDoor;
          else
               return judgesChoice(rand.nextInt(3), initialChoice); //infinite loop right here that I cannot remedy.  I want the program to have the judge pick a location that is not occupied by a  '1' and is not the user's choice. 
     public void gamePlaySwitches()
          int initialChoice= rand.nextInt(3);
          int judgeDoor = 0;
          int secondChoice= 0;
          judgeDoor= judgesChoice(rand.nextInt(3), initialChoice);
          //This part is meant to have the user switch choices from his initial choice
               // to the only other choice that hasn't been revealed by the judge. 
          while(secondChoice == initialChoice || secondChoice== judgeDoor)
               secondChoice++;
          if(doors[secondChoice]==1)
               wins++;
               totals++;
          else
               totals++;          
     public static void main(String [] args)//creates the main menu
          Monty_Problem a= new Monty_Problem();
          int games=0;
          while(games!=100)
                    a.carAssignment();
                    a.gamePlaySwitches();
                    games++;
          System.out.println(a.wins/a.totals);
}Edited by: EvanD on Jan 11, 2008 4:17 PM