Convert Numbers to Words

Convert numbers to words..
ex:
100 = one hundred
101 = one hundred and one

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public class NumberToWordsConverter { final private static String[] units = {"Zero","One","Two","Three","Four", "Five","Six","Seven","Eight","Nine","Ten", "Eleven","Twelve","Thirteen","Fourteen","Fifteen", "Sixteen","Seventeen","Eighteen","Nineteen"}; final private static String[] tens = {"","","Twenty","Thirty","Forty","Fifty", "Sixty","Seventy","Eighty","Ninety"}; public static void main(String[] args){ System.out.print(convert(312)); } public static String convert(int i) { if( i < 20) return units[i]; if( i < 100) return tens[i/10] + ((i % 10 > 0)? " " + convert(i % 10):""); if( i < 1000) return units[i/100] + " Hundred" + ((i % 100 > 0)?" and " + convert(i % 100):""); if( i < 1000000) return convert(i / 1000) + " Thousand " + ((i % 1000 > 0)? " " + convert(i % 1000):"") ; return convert(i / 1000000) + " Million " + ((i % 1000000 > 0)? " " + convert(i % 1000000):"") ; } }