Web Reference: The set is an interface in Collection that supports only unique values. Set extends collection but the class which implements set is different and the class name is HashSet. Nov 18, 2025 · In Java, the Set interface is a part of the Java Collection Framework, located in the java.util package. It represents a collection of unique elements, meaning it does not allow duplicate values. The Set interface is part of the Java Collections Framework and is used to store a collection of unique elements. Unlike a List, a Set does not allow duplicates, and it does not preserve the order of elements (unless you're using TreeSet or LinkedHashSet).
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