How does the 'accessOrder' Configuration in LinkedHashMap Work in Java?

LinkedHashMap is a pre-defined class in Java programming that can be extended from HashMap. It gives the hash table a consistent order of iterations. The java.util package contains LinkedHashMap, which is used to maintain double-linked lists.

Syntax:

Parameters:

K: can be defined as the kinds of keys found on the map.

V: can be defined as the kinds of values found on the map.

intialCapacity: can be characterized as an integer that indicates the LinkedHashMap's starting capacity.

loadFactory: can be characterized as the LinkedHashMap's load factor being specified.

accessOrder: can be characterized as a signal that the LinkedHashMap preserves the insertion or access order.

Note: The sequence in which users can conduct access operations on the LinkedHashMap determines which items will be printed first: first access elements will be printed first, second access elements will be printed second, and so on.

Algorithm

Step 1: Create a new class called AccessOrder, and include the main method that will be used to provide the logic for access order.

Step 2: Create an instance of a LinkedHashMap<K, V> object and set accessOrder = true to enable access order sorting of the map items instead of insertion order.

Step 3: Fill the LinkedHashMap with key-value pairs by using the put(K key, V value) function. Elements in the map are stored via this operation.

Step 4: Three calls to the get(Object key) method will simulate access to individual entries in the LinkedHashMap, allowing you to retrieve its elements. This will bring the elements' access order up to date.

Step 5: The LinkedHashMap's final state, which prints or displays the entries in the order decided by the access operations carried out, is displayed.

• The initial number of buckets in the hash table is specified by parameter 1 (16), which is also known as the LinkedHashMap's initial capacity.
• It is possible to define parameter 2 (0.75f) as the load factor, which in turn determines when the LinkedHashMap will automatically resize.
• When parameter 3 (true) is set to true, the access order can be enabled. The LinkedHashMap then keeps the order of entries consistent with the access order.

Implementation:

FileName: AccessOrderExample.java

Output:

 
The Entries present in the  LinkedHashMap with access order is given by :
3: Three
2: Two
1: One