use of linkedhashmap in java code example

Example 1: linkedhashmap in java

LinkedHashMap is same as HasHMap just additionally maintains the insertion order.

Example 2: hashmap and linkedhashmap

Main difference between HashMap and LinkedHashMap
I remember is that LinkedHashMap maintains
insertion order of keys, 
On the other hand HashMap doesn't maintain
any order or keys or values.
Also LinkedHashMap requires more memory than HashMap
because of the ordering feature.
LinkedHashMap doublly Linked List to 
maintain order of elements.