immutable: Immutable collections cannot be modified after creation. unmodifiable: As these terms suggest on their face, different collections may or may not support modification operations. In working with collections, developers need to be familiar with and understand some specific collections-related terminology: Sets, Queues, Lists, and Maps each have descendants, such as sorted sets ( ) and navigable maps ( ). Maps are not collections in the truest sense as they don’t extend collection interfaces, but developers can manipulate Maps as if they are collections. In addition to sets, there are queues ( ) and maps ( ). The Set interface inherits its methods from Collection () and contains only those methods. A Set is a collection that does not allow for duplicate elements and does not store elements in any particular order. Developers can work with collections in much the same way they work with other data types, performing common tasks such as searches or manipulating the collection's contents.Īn example of a collection in Java is the Set Collection interface (). Java collections are simply data structures representing a group of Java objects. Understanding the distinction between Java collections and the Java Collections Framework is essential. The JCF provided a standardized interface and common methods for collections, reduced programming effort, and increased the speed of Java programs. One early advancement came in 1998 when Java introduced the Collection Framework (JCF), which simplified working with Java objects. Throughout its life, Java has undergone substantial evolution.
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