I need to create a public class method travel() that takes a single argument of type Wizard class and returns no value.

I need to create a public class method travel() that takes a single argument of type Wizard and returns no value. The wizard should move left or right as appropriate one cell at a time. If the wizard's cellX value is currently LAST_CELL it should move so that its cellX value is 0. Otherwise it should move so that its value is LAST_CELL. below is full code to help:

private Wizard wizard1;
 private Wizard wizard2;
 private int numOfRepeats;

 private static final int MIN_NUM_REPEATS = 1;
 private static final int MAX_NUM_REPEATS = 3;

 public static final int LAST_CELL = 11;

 /**
  * Constructor for objects of class WizardController.
  */
 public WizardController(Wizard aWizard1, Wizard aWizard2)
 {
    super();
    this.wizard1 = aWizard1;
    this.wizard2 = aWizard2;
    this.numOfRepeats = 0;
 }

 /* instance methods */
 /**
  * Prompts the user for a number of action repeats
  * in the range 1 to 3 inclusive, and returns this number.
  */
 public int promptForNumOfRepeats()
 {
   int moves;
   moves = Integer.parseInt(OUDialog.request("Please enter the number of"
       + " action repeats to be performed - between 1 and 3 (inclusive)"));

        try
   {
      moves = Integer.parseInt(OUDialog.request("Please enter the number of"
        + " action repeats to be performed - between 1 and 3 (inclusive)"));
   }

   catch (NumberFormatException anException)
   {
      moves = 0;
   }

   return moves;
 }

  /**
  * Returns true if the argument is in the range 1 to 3 (inclusive),
  * otherwise false.
  */
 public boolean isValidNumOfRepeats(int aNumber)
 {
    return ((aNumber >= WizardController.MIN_NUM_REPEATS)
    && (aNumber <= WizardController.MAX_NUM_REPEATS));
 }

 /**
  * Repeatedly prompts the user for a number of repeats of the moves,
  * until they enter a valid input representing a number in the range 1 to 3
  * inclusive, and  then returns this number.
  */
 public int getNumOfRepeats()
 {
    int repeats = this.promptForNumOfRepeats();
    while (!this.isValidNumOfRepeats(repeats))
    {
       OUDialog.alert("That is not a valid number of game repeats");
       repeats = this.promptForNumOfRepeats();
    }
    return repeats;
 }