public class NumbersInWords {

    private int numberToConvert;
    private int millions;
    private int thousands;
    private int lessThanThousand;
    private int hundreds;
    private int dozens;
    private int digits;
    String[] wordDigits = {"","jeden","dwa","trzy","cztery","pięć","sześć","siedem","osiem","dziewięć"};
    String[] wordTeens = {"dziesięć","jedenaście","dwanaście","trzynaście","czternaście","piętnaście","szesnaście","siedemnaście","osiemnaście","dziewiętnaście"};
    String[] wordDozens = {"","","dwadzieścia","trzydzieści","czterdzieści"};
    String[] wordHundreds = {"","sto","dwieście","trzysta","czterysta"};



    public String toWord(int number){
        numberToConvert = number;

        return convertMillions() + convertThousands() + convertLessThanThousand();

    }


    private void setMillions(){
        millions = numberToConvert / 1000000;
    }

    private void setThousands(){
        thousands = (numberToConvert % 1000000) / 1000;
    }

    private void setLessThanThousand(){
        lessThanThousand = (numberToConvert % 1000000) % 1000;
    }

    private String convertNumber(int num){
        hundreds = num / 100 ;
        dozens = (num % 100) / 10;
        digits = (num % 100) % 10;
        String wordNumber = "";
        if (hundreds >0) {
            if (hundreds < 5){
                wordNumber += wordHundreds[hundreds] + " ";
            }
            else {
                wordNumber += wordDigits[hundreds] +"set ";
            }
        }
        switch (dozens) {
            case 0:
                wordNumber += wordDigits[digits];
                break;
            case 1:
                wordNumber += wordTeens[digits];
                break;
            default:
                if (dozens < 5){
                    wordNumber += wordDozens[dozens] + " " + wordDigits[digits];
                }
                else {
                    wordNumber += wordDigits[dozens] + "dziesiąt " + wordDigits[digits];
                }
        }
        return wordNumber;




    }

    private String convertMillions(){
        String wordMillions = "";
        setMillions();
        if (millions > 0){
            wordMillions = convertNumber(millions);
            if (millions == 1){
                    wordMillions += " milion ";
            }
            else if ((millions < 5) || ((dozens != 1) & (digits < 5)&(digits > 0))){
                wordMillions += " miliony ";
            }
            else wordMillions += " milionów ";

        }
        return wordMillions;
    }


    private String convertThousands(){
        String wordThousands = "";
        setThousands();
        if (thousands > 0){
            wordThousands = convertNumber(thousands);
            if (thousands == 1){
                wordThousands += " tysiąc ";
            }
            else if ((thousands < 5) || ((dozens != 1) & (digits < 5)&(digits > 0))){
                wordThousands += " tysiące ";
            }
            else wordThousands += " tysięcy ";

        }
        return wordThousands;
    }


    private String convertLessThanThousand(){
        String wordLessThanThousand = "";
        setLessThanThousand();
        if (lessThanThousand > 0){
            wordLessThanThousand = convertNumber(lessThanThousand);
        }
        return wordLessThanThousand;
    }



}