Java Convert Number to Words

The given code accept numbers from 1 to 999 and convert them to words. For example, 1 is to be displayed as one.

public class ConvertNumberToWords {

    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 String convert(Integer 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):"") ;
    }
    public static void main(String[]args){
        for(int i=1;i<1000;i++){
            System.out.println(i+" \t "+convert(i));
        }
    }


}

If you want to convert big numbers, then go through the following link:

Java Convert Numbers to Words