The given code create a recursive function to count numbers from 000 to 444 as string. The maximum digit is 4.

import java.util.*;
class PrintNumbers 
{
    static public void findNumbers(String[] array, List<String> list, String st, int depth) {
        if (st.length() >= depth)
           return;
        for (String s : array) {
            String str=st+s;
            list.add(str);
            findNumbers(array, list, str, depth);
        }
        for (int i=0; i<list.size(); i++){
        if(list.get(i).length()<3){
            list.remove(i);  
        }
      }
    }
    public static void main(String[] args) {
        String[] numbers = {"0", "1", "2", "3", "4"};
        ArrayList<String> list = new ArrayList<String>();
        findNumbers(numbers, list, "", 3);
        System.out.println(list);
    }
}

Thanks a lot.... Really appreciate...