Web Reference: Jul 23, 2025 · The set interface in the java.util package and extends Collection interface is an unordered collection of objects in which duplicate values cannot be stored. It is an interface that implements the maths set. In the context of Java, the only difference between a List and a Set is that the Set contains unique items. In the context of mathematics, the items of a set are unique and unordered. In this tutorial, we’ll discuss the differences between Set and List in Javawith the help of a simple example. Also, we’ll compare the two data structures in terms of performance and memory allocation.
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