How to remove duplicate elements from ArrayList ?

In this tutorial, we will learn about How to remove duplicate elements from ArrayList.

ArrayList in Java is a resizable-array implementation of the List interface and is one of the most widely used collection classes. ArrayList allows duplicate elements. Sometimes we may need to remove duplicate elements from ArrayList. Let’s see how to remove duplicate elements from ArrayList with an example.

Example:

Output:

In the above program, we have removed the duplicate elements from ArrayList and also preserved the insertion order.

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