Is it possible to get element from HashMap by its position?

Question

How to retrieve an element from HashMap by its position, is it possible at all?

Answer 1

By default, java LinkedHasMap does not support for getting value by position. So I suggest go with customized IndexedLinkedHashMap

public class IndexedLinkedHashMap extends LinkedHashMap {

    private ArrayList keysList = new ArrayList<>();

    public void add(K key, V val) {
        super.put(key, val);
        keysList.add(key);
    }

    public void update(K key, V val) {
        super.put(key, val);
    }

    public void removeItemByKey(K key) {
        super.remove(key);
        keysList.remove(key);
    }

    public void removeItemByIndex(int index) {
        super.remove(keysList.get(index));
        keysList.remove(index);
    }

    public V getItemByIndex(int i) {
        return (V) super.get(keysList.get(i));
    }

    public int getIndexByKey(K key) {
        return keysList.indexOf(key);
    }
}

Then you can use this customized LinkedHasMap as

IndexedLinkedHashMap indexedLinkedHashMap=new IndexedLinkedHashMap<>();

TO add Values

indexedLinkedHashMap.add("key1",UserModel);

To getValue by index

indexedLinkedHashMap.getItemByIndex(position);