Java Streams | Finding Duplicates Using Set and Filter | Java Inspires

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When working with collections in Java, a common task is finding duplicate elements. With the introduction of the Stream API in Java 8, performing such operations has become both efficient and elegant.

One of the simplest ways to find duplicates is by leveraging two sets:

A set to store unique elements.
A set to store duplicates.
The logic is straightforward: if the element is already present in the seen set, it’s a duplicate and should be added to the duplicates set.

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