java difference between arraylist and linkedlist code example

Example 1: what is the difference ArrayList vs LinkedList

ArrayList is array based, internally uses array
LinkedList consists of nodes/values that are related to each other
ArrayList and LinkedList both keep ordering
ArrayList and LinkedList both allow duplicates

Example 2: arraylist vs linkedlist

- ArrayList not syncronized, array based class 
- LinkedList not synchronized, doubly linked
ArrayList and LinkedList both keep ordering
ArrayList and LinkedList both allow duplicates

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