How to find a number is binary or not in java ??

package org.cmania;

public class BinaryCollection
{
    public static void main(String[] args)
{

           int n=11001011;
           System.out.println(isBinaryNumber(n)? n+" is binary number." : n+" is not binary number.");
           n=11001110;
           System.out.println(isBinaryNumber(n)? n+" is binary number." : n+" is not binary number.");
           n=10000112;
           System.out.println(isBinaryNumber(n)? n+" is binary number." : n+" is not binary number.");
           n=11005110;
           System.out.println(isBinaryNumber(n)? n+" is binary number." : n+" is not binary number.");
    }
 
    /**
     * returns true if number is binary.
     */
    public static boolean isBinaryNumber(int n){    
        while(n != 0){
         if(n%10 > 1){
             return false;  //number containing any digit greater than 1 means its not binary.
         }
         n = n/10;  
        }
        return true;
    }  
 
}