How can I add letters to this?

Question

Here is a code?

import java.util.HashMap;
public class Solution {
public static void main(String [] args){
HashMap<Integer, String> passportsAndNames= new HashMap<>();
passportsAndNames.put (123456, "Stive Carrol");
passportsAndNames.put (234567, "James Hope");
passportsAndNames.put (345678, "Herrard Alba");
System.out.println(passportsAndNames);
}
}
Outputs:
{123456=Stive Carrol, 234567=James Hope, 345678=Herrard Alba}
The question is that how can I add letters before or after the numbers. Output should be like this:
AA123456=Stive Carrol. Because passports usually consists of both numbers and letters.

Answer 1

Then do this:
HashMap<String, String> p = new HashMap<>();
p.put("AA123456","Stive Carrol");
System.out.println(p);

Answer 2

Thank you Namit Jain, now it outputs as I wanted