Write a java program to find duplicate elements in an array. Given an array of integers, We have to write a code to find all duplicate elements in an array.
For example :
Input : arr = { 2, 5, 3, 1, 8, 7, 5, 3, 2 }
Output: {5, 3, 2}
In this tutorial, I am going to explain three approaches to find duplicate elements in an array. This question is also very important for technical interviews.