Conversia din cifre in litere care le denumesc

public class house{
String conversie_numar(int val){
switch(val){
case 0:return "zero ";
case 1:return "unu ";
case 2:return "doi ";
case 3:return "trei ";
case 4:return "patru ";
default :return " ";
}
}
public static void main(String args[]){
house a=new house();
String num=a.conversie_numar(4) + a.conversie_numar(1) + a.conversie_numar(3);
System.out.println("413 convertit in: " + num );
}
}