sayiyiYaziyaDonusturme.java

package egcodes;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * @author egcodes
 */
public class Main {

    static List<String> birlik = Arrays.asList("", "bir", "iki", "uc", "dort", "bes", "alti", "yedi", "sekiz", "dokuz");
    static List<String> onluk = Arrays.asList("", "on", "yirmi", "otuz", "kırk", "elli", "altmis", "yetmis", "seksen", "doksan");
    static List<String> diger = Arrays.asList("yuz", "bin", "milyon", "milyar");

    public static void main(String[] args) {

        printString(2124522345);
        printString(1124522345);
        printString(1224522345);
        printString(205420345);
        printString(20250345);
        printString(1050345);
        printString(1000345);
        printString(1010005);
        printString(20345);
        printString(20341);
        printString(2000000000);
        printString(2000000001);
        printString(2000000010);
        printString(2000000100);
        printString(2000001000);
        printString(2000101000);
        printString(2001001000);
        printString(2100001000);
        printString(2010001000);
        printString(100001);
        printString(100011);
        printString(100100);
        printString(110001);
        printString(10001);
        printString(11001);
        printString(10011);
        printString(10101);
        printString(2001);
        printString(1001);
        printString(1010);
        printString(1101);
        printString(1011);
        printString(1000);
        printString(999);
        printString(100);
        printString(110);
        printString(101);
        printString(200);
        printString(15);
        printString(11);
        printString(10);
        printString(9);

    }

    public static void printString(int val) {
        String valStr = String.valueOf(val);

        //Ucerli basamaklara ayirma ve bir listeye atma
        //1123456 -> 1.123.456
        ArrayList<String> valList = new ArrayList<>();
        while (true) {
            if (valStr.isEmpty() || Integer.parseInt(valStr) < 100) {
                if (!valStr.isEmpty()) {
                    valList.add(valStr);
                }
                break;
            }
            valList.add(valStr.substring(valStr.length() - 3, valStr.length()));
            valStr = valStr.substring(0, valStr.length() - 3);
        }
        Collections.reverse(valList);

        // Liste ters cevrildikten sonra sırayla yaziya cevirme
        //1123456 1.123.456 -> bir milyon | yuz yirmi uc bin | dort yuz elli alti
        String print = "";
        int index = 0;
        for (String parted : valList) {

            if (Integer.parseInt(parted) >= 100) {
                if (parted.startsWith("1")) {
                    print += diger.get(0) + " ";
                } else {
                    print += birlik.get(Integer.parseInt(parted.substring(0, 1))) + " " + diger.get(0) + " ";
                }
                print += onluk.get(Integer.parseInt(parted.substring(1, 2))) + " ";
                print += birlik.get(Integer.parseInt(parted.substring(2, 3))) + " ";

            } else if (Integer.parseInt(parted) >= 10) {
                if (parted.startsWith("0")) {
                    parted = parted.substring(1, parted.length());
                }
                print += onluk.get(Integer.parseInt(parted.substring(0, 1)));
                print += birlik.get(Integer.parseInt(parted.substring(1, 2)));

            } else if (Integer.parseInt(parted) >= 0) {
                //Bin icin ozel durum (birbin engelleme 1001, 1234 gibi)
                if (valList.size() > 1 && String.valueOf(val).length() == 4 && parted.length() == 1 && parted.equals("1")) {
                } else {
                    print += birlik.get(Integer.parseInt(parted));
                }
            }

            index++;
            if (parted.length() != 0 && valList.size() > 1 && index < valList.size()) {
                if (parted.equals("000")) {
                } else {
                    print += diger.get(valList.size() - index) + " ";
                }
            }
        }

        System.out.format("%-15d -> %s\n", val, print);
    }
}