জাভা pair

import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] args) {

    Map<String, String> user = new HashMap<>();

    user.put("", "মোঃ আরিফ");
    user.put("", "");

    System.out.println(user.get("নাম"));
    System.out.print(user.get("দেশ"));
  }
}