Challenge 2: Remove Duplicates From an ArrayList

Problem statement

Given a Character ArrayList, you have to implement a Java method to remove all the duplicate elements from it.

Function prototype

void removeDuplicates(ArrayList<Character> arrList)

Output

An ArrayList with all the unique elements.

Sample input

arrList = [a,b,b,c,c,c,d]

Sample output

arrList = [a,b,c,d]