Number to Words (Java 8 ver) Sample by ClearNB

Solution.java

import java.util.*;

public class Solution {
    private static final String[] FDigitsData = {"", "One ", "Two ", "Three ", "Four ", "Five ", "Six ", "Seven ", "Eight ", "Nine "};
    private static final String[] SDigitsData = {"Ten ", "Eleven ", "Twelve ", "Thirteen ", "Fourteen ", "Fifteen ", "Sixteen ", "Seventeen ", "Eighteen ", "Nineteen "};
    private static final String[] TensData = {"", "", "Twenty ", "Thirty ", "Forty ", "Fifty ", "Sixty ", "Seventy ", "Eighty ", "Ninety "};
    private static final String[] THData = {"", "Thousand ", "Million ", "Billion ", "Trillion "};

    static void printNumber(int ThirdDigitData, int SecondDigitData, int FirstDigitData, int THIndex) {
        if(ThirdDigitData != 0) {
            print(FDigitsData[ThirdDigitData] + "Hundred ");
        }
        if(SecondDigitData == 1) {
            print(SDigitsData[FirstDigitData]);
        } else if(SecondDigitData > 1) {
            print(TensData[SecondDigitData] + FDigitsData[FirstDigitData]);
        } else {
            print(FDigitsData[FirstDigitData]);
        }
        if((ThirdDigitData + SecondDigitData + FirstDigitData) != 0) {
            print(THData[THIndex]);
        }
    }
    
    static void print(String str) {
        System.out.print(str);
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int T = sc.nextInt();
        for(int a0 = 0; a0 < T; a0++) {
            String N = sc.next();
            ArrayList<Integer> NDatas = new ArrayList<Integer>();
            int NSize = N.length();
            if((3 - N.length() % 3) != 3) {
                NSize += 3 - N.length() % 3;
            }
            int Ncnt = NSize - N.length();
            int Nsum = 0;
            for(int i = 0; i < NSize; i++) {
                if(Ncnt - i > 0) {
                    NDatas.add(0);
                } else {
                    NDatas.add(Integer.parseInt(N.substring(i - Ncnt, (i + 1) - Ncnt)));
                }
                Nsum += NDatas.get(i);
            }
            if(Nsum != 0) {
                int j = 0;
                int Ncnt2 = NSize / 3;
                for(int i = 0; i < NDatas.size(); i = i + 3) {
                    j++;
                    printNumber(NDatas.get(i), NDatas.get(i + 1), NDatas.get(i + 2), Ncnt2 - j);
                }
            } else {
                print("Zero");
            }
            System.out.println();
        }
    }
}