Print out the text form of numbers from 1 - 1000000(eg 20 is "twenty")

ConvertNumToText.java

public class ConvertNumToText {
	
	public static String[] digits = {"One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
	public static String[] teens = {"Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
	public static String[] tens = {"Ten", "Twenty", "Thirty", "Fourty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
	public static String[] bigs = {"", "Thousand", "Million"};

	public static void main(String[] args) {
		for (int i = 1; i < 1000001; i++){
			System.out.println(numToString(i));
		}		

	}
	
	public static String numToString(int number){
		if (number == 0){
			return "Zero";
		} else if(number < 0){
			return "Negative " + numToString(-1 * number);
		}
		
		int count = 0;
		String str = "";
		
		while (number > 0){
			if (number % 1000 != 0){
				str = numToString100(number %1000) + bigs[count] + " " + str;
			}
			number /= 1000;
			count++;
		}
		
		return str;
	}
	public static String numToString100(int number){
		String str = "";
		
		if (number >= 100){
			str += digits[number / 100 - 1] + " Hundred ";
			number %= 100;
		}
		
		if (number >= 11 && number <= 19){
			return str + teens[number - 11] + " ";
		} else if(number == 10 || number >= 20){
			str += tens[number / 10 - 1] + " ";
			number %= 10;
		}
		
		if (number >= 1 && number <= 9){
			str += digits[number - 1] + " ";
		}
		
		return str;
	}

}