Java dizilerin kartezyen çarpımı

Arkadaşımın ihtiyacı üzerine geliştirdiğim algoritmanın java kodları;

public class Hadi {

    private static String[] oldies;
    private static List perList = new ArrayList();
   
    public static void main(String[] args) {
        perList.add(new String[] {"ist,","ank,","adn,"});
        perList.add(new String[] {"ali,","veli,","maria,","nursel,"});
        perList.add(new String[] {"elma","armut"});
       
        oldies = new String[perList.size()];
       
        printIt(0);
    }
   
    private static void printIt(int level) {
        for (int i = 0; i < perList.get(level).length; i++) {
            oldies[level] = perList.get(level)[i];
           
            if (level < perList.size() - 1) {
                printIt(level + 1);
            }
           
            if (level == perList.size() - 1) {
                for (int j = 0; j < oldies.length; j++) {
                    System.out.print(oldies[j]);
                }
                System.out.println();
            }
        }
    }

}

Çıktısı ise;

ist,ali,elma
ist,ali,armut
ist,veli,elma
ist,veli,armut
ist,maria,elma
ist,maria,armut
ist,nursel,elma
ist,nursel,armut
ank,ali,elma
ank,ali,armut
ank,veli,elma
ank,veli,armut
ank,maria,elma
ank,maria,armut
ank,nursel,elma
ank,nursel,armut
adn,ali,elma
adn,ali,armut
adn,veli,elma
adn,veli,armut
adn,maria,elma
adn,maria,armut
adn,nursel,elma
adn,nursel,armut