Convert an integer to any base

IntegerBaseConversion.java

class IntegerBaseConversion{
	static String numbers= "0123456789abcdef";
	public static void main(String ... args){
		if(args.length!=2){
			int n= Integer.parseInt(args[0]);
			int base= Integer.parseInt(args[1]);
			System.out.println(convertBase(n, base));
		}
	}

	static String convertBase(int n, int base){
		if(n<base){
			return numbers.charAt(n)+"";
		}
		return convertBase(n/base, base)+numbers.charAt(n%base);
	}
}