Number 0...100 to Text

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int number = Integer.parseInt(scanner.nextLine());

        List<String> numbersTo20 = Arrays.asList("zero", "one", "two", "three", "four", "five", "six", "seven",
                "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen",
                "seventeen", "eighteen", "nineteen");

        List<String> numbersAfter20 = Arrays.asList("twenty", "thirty", "forty", "fifty", "sixty", "seventy",
                "eighty", "ninety", "one hundred");

        String numberAsWord = "";

        if(number >= 0 && number < 20){
            numberAsWord = numbersTo20.get(number);
        }else if(number > 0 && number <= 100){
            if(number % 10 == 0){
                numberAsWord = numbersAfter20.get(number / 10 - 2);
            }else{
                numberAsWord = numbersAfter20.get(number / 10 - 2)
                        + " " + numbersTo20.get(number % 10);
            }
        }

        if (!numberAsWord.equals("")) {
            System.out.println(numberAsWord);
        }else{
            System.out.println("Invalid number");
        }

    }
}