How to modify HashMaps according to values

Lightcaster5 :

Let's say I have a HashMap<String, Integer> containing usernames and their position as an int in a queue or line. How would I go about removing a user from the queue and subsequently update all the values for the users behind?

Arvind Kumar Avinash :

You can do it as follows:

import java.util.LinkedHashMap;
import java.util.Map;

public class Main {
    static Map<String, Integer> queueMap = new LinkedHashMap<String, Integer>();

    public static void main(String[] args) {
        queueMap.put("Arvind", 5);
        queueMap.put("Avinash", 6);
        queueMap.put("Kumar", 7);
        queueMap.put("Lightcaster", 8);
        queueMap.put("Stackoverflow", 9);
        System.out.println("Before: " + queueMap);
        removeFromQueue("Kumar");
        System.out.println("After: " + queueMap);
    }

    static void removeFromQueue(String user) {
        final Integer userPlace = queueMap.get(user);
        if (userPlace != null) {
            queueMap.replaceAll((k, v) -> v > userPlace ? v - 1 : v);
            queueMap.remove(user);
        }
    }
}

Output:

Before: {Arvind=5, Avinash=6, Kumar=7, Lightcaster=8, Stackoverflow=9}
After: {Arvind=5, Avinash=6, Lightcaster=7, Stackoverflow=8}