Restore IP Addresses

import java.util.ArrayList;
//Restore IP Addresses My Submissions Question Solution 
//Total Accepted: 40984 Total Submissions: 191711 Difficulty: Medium
//Given a string containing only digits, restore it by returning all possible valid IP address combinations.
//
//For example:
//Given "25525511135",
//
//return ["255.255.11.135", "255.255.111.35"]. (Order does not matter)
import java.util.List;
//Given a string containing only digits, restore it by returning all possible valid IP address combinations.
//
//For example:
//Given "25525511135",
//
//return ["255.255.11.135", "255.255.111.35"]. (Order does not matter)
public class RestoreIPAddresses {


public static void main(String[] args) {
// TODO Auto-generated method stub


}


public List<String> restoreIpAddresses(String s) {
List<String> result = new ArrayList<>();
dfs("", s, 0, result);
return result;
}


private void dfs(String ipString, String s, int count, List<String> result) {
// TODO Auto-generated method stub
if (count == 4 && s.equals("")) {
result.add(ipString.substring(0, ipString.length() - 1));
return;
} else if (count < 4)
{
if (s.length() >= 1) {
dfs(ipString + s.substring(0, 1) + ".", s.substring(1), count + 1, result);
}
if (s.length() >= 2 && !s.substring(0, 1).equals("0")) {
dfs(ipString + s.substring(0, 2) + ".", s.substring(2), count + 1, result);
}
if (s.length() >= 3&&Integer.parseInt(s.substring(0, 3))>=100&&Integer.parseInt(s.substring(0, 3))<=255) {
dfs(ipString + s.substring(0, 3) + ".", s.substring(3), count + 1, result);
}


}


}
}