Cows and Bulls Game

 import java.util.*;  
 /**  
  * Created by Mridul on 10/17/15.  
  */  
 public class CowsAndBulls {  
   private final int[] secretNumber;  
   private int[] guessNumber;  
   private List<String> guesses;  
   private int size;  
   private static final int DEFAULT_SIZE=4;  
   private int getSize(){  
     if(size==0) {  
       return DEFAULT_SIZE;  
     }else{  
       return size;  
     }  
   }  
   private void setSize(int size){  
     this.size = size;  
   }  
   public int[] getSecretNumber(){  
     return secretNumber;  
   }  
   CowsAndBulls(){  
     secretNumber=populateSecretNumber();  
     guessNumber=new int [getSize()];  
     Arrays.fill(guessNumber,0);  
     guesses=new ArrayList<>();  
   }  
   private int[] populateSecretNumber(){  
     Random rand=new Random();  
     int size=getSize();  
     int[] number= new int[size];  
     for(int i=0;i<size;i++){  
       number[i]= rand.nextInt(9);  
     }  
     return number;  
   }  
   public void verifyGuess(String guess){  
     try {  
       int iguess = Integer.parseInt(guess);  
       int len = guess.length();  
       int remainder = 0;  
       while (len > 0) {  
         guessNumber[--len] = iguess % 10;  
         iguess = iguess / 10;  
       }  
       computeCowsAndBulls();  
     }catch (NumberFormatException nfe){  
       System.out.println("Please enter a valid number");  
     }  
   }  
   private void computeCowsAndBulls(){  
     int cows=0;  
     int bulls=0;  
     for(int i=0; i<guessNumber.length;i++){  
       for(int j=0;j<secretNumber.length;j++){  
         if(guessNumber[i]==secretNumber[j]){  
           //if indexes are same then bulls  
           if(i==j) {  
             ++bulls;  
           }else {  
             ++cows;  
           }  
         }  
       }  
     }  
     System.out.printf("%d bulls and %d cows\n", bulls, cows);  
   }  
   public static void main(String... args){  
     CowsAndBulls instance =new CowsAndBulls();  
     do {  
       System.out.println("Starting Cows and Bulls game!");  
       System.out.println("Please type EXIT to quit the game anytime!");  
       System.out.println("Please type REVEAL to show the 4 digit number anytime!");  
       System.out.println("Please start guessing the 4 digit number : ");  
       Scanner scanner = new Scanner(System.in);  
       String currentGuess = scanner.next();  
       if(currentGuess.equalsIgnoreCase("EXIT")){  
         System.out.println("Thanks for playing the game!");  
         System.exit(0);  
       }else if(currentGuess.equalsIgnoreCase("REVEAL")){  
         System.out.println("The Secret number is : "  
             + Arrays.toString(instance.getSecretNumber()));  
         System.out.println("Thanks for playing the game!");  
         System.exit(0);  
       }  
       else {  
         instance.verifyGuess(currentGuess);  
       }  
     }while(true);  
   }  
 }