How to Remove Duplicates in ArrayList with Example using java code

         Duplicate Elements/Strings can be removed from ArrayList in many ways . One way to remove duplicates will be using HashSet . Because HashSet does not allow duplicates. Just convert the array list to  HashSet and convert back to array list. That is it.

 Another way can be using another ArrayList. Adding elements one by one from the first ArrayList to Second ArrayList by checking whether the element exists in the second array list.

 To find and print duplicates and number of occurrence of duplicates in a file, please visit Find and print duplicates using HashMap 

The below code removes the duplicates from the arraylist in both ways.

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