Write a program to print numeric number into English words. (Minimum 3 digit numeric) Input: 947 Output: nine hundred forty seven

NumberToWord.java

package com.examples.java8.ListTomap;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by adityacchaudhari on 27/06/2017.
 */
public class NumberToWords {

    //Declare map
    static Map<Integer, String> zeroToTwentyNumToWordsMap = new HashMap<>();
    static Map<Integer, String> tensWordsMap = new HashMap<>();

    public static void main(String args[]) throws IOException{

        //load initial values
        loadInitialMapValues();

        int numberToConvertToWord=120;
        String result = getWordFromNumber(numberToConvertToWord);
        System.out.println("Input : " +numberToConvertToWord+ " \nOutput : "+ result );

    }

    public static String getWordFromNumber(int no) throws ArithmeticException {

        if (no <= 20) {
            return zeroToTwentyNumToWordsMap.get(no);
        }
        else if(no >20 && no<=99){
            return twoDigitNumberToWord(no);

        }else if (no >=100 && no <= 999) {
            return threeDigitNumberToWord(no);

        } else {
            System.out.println("INPUT NO IS OUT OF SCOPE REQUEST YOU TO PLEASE ENTER THREE DIGIT NUMBER THANKS .");
        }

        return "UNKNOWN INPUT";
    }

    private static String twoDigitNumberToWord(int no) {

        String firstDigit= tensWordsMap.get(no/10);
        String secondDigit=zeroToTwentyNumToWordsMap.get(no%10);

        if(secondDigit.equals("zero")){
            secondDigit ="";
        }

        return firstDigit+" "+secondDigit;
    }

    private static String threeDigitNumberToWord(int no) {

        String firstDigit= zeroToTwentyNumToWordsMap.get(no/100);
        String secondDigit=twoDigitNumberToWord(no%100);

        if(no==100){
            return "hundred";
        }

        return firstDigit+" "+secondDigit;
    }


    private static void loadInitialMapValues() {
        //initialize 0 to 20 values
        zeroToTwentyNumToWordsMap.put(0, "zero");
        zeroToTwentyNumToWordsMap.put(1, "one");
        zeroToTwentyNumToWordsMap.put(2, "two");
        zeroToTwentyNumToWordsMap.put(3, "three");
        zeroToTwentyNumToWordsMap.put(4, "four");
        zeroToTwentyNumToWordsMap.put(5, "five");
        zeroToTwentyNumToWordsMap.put(6, "six");
        zeroToTwentyNumToWordsMap.put(7, "seven");
        zeroToTwentyNumToWordsMap.put(8, "eight");
        zeroToTwentyNumToWordsMap.put(9, "nine");
        zeroToTwentyNumToWordsMap.put(10, "ten");
        zeroToTwentyNumToWordsMap.put(11, "eleven");
        zeroToTwentyNumToWordsMap.put(12, "twelve");
        zeroToTwentyNumToWordsMap.put(13, "thirteen");
        zeroToTwentyNumToWordsMap.put(14, "fourteen");
        zeroToTwentyNumToWordsMap.put(15, "fifteenth");
        zeroToTwentyNumToWordsMap.put(16, "sixteen");
        zeroToTwentyNumToWordsMap.put(17, "seventeen");
        zeroToTwentyNumToWordsMap.put(18, "eighteen");
        zeroToTwentyNumToWordsMap.put(19, "nineteen");
        zeroToTwentyNumToWordsMap.put(20, "twenty");

        //initialize tens values
        tensWordsMap.put(0, "");
        tensWordsMap.put(1, "");
        tensWordsMap.put(2, "twenty");
        tensWordsMap.put(3, "thirty");
        tensWordsMap.put(4, "forty");
        tensWordsMap.put(5, "fifty");
        tensWordsMap.put(6, "sixty");
        tensWordsMap.put(7, "seventy");
        tensWordsMap.put(8, "eighty");
        tensWordsMap.put(9, "ninety");
    }

}