The Java collections framework has a very complex API hierarchy. The following class diagram shows a brief overview of the Java Collections Framework which is divided into four groups: List, Set, Map and Queue.

The Java Collections Framework provides a unified architecture for managing collections of objects. Understanding the hierarchy and the different interfaces and classes available allows you to choose the appropriate collection for your specific needs.

Mar 21, 2025 · In Java, a separate framework named the “Collection Framework” has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interface (java.util.Collection) and Map interface (java.util.Map) are the two main “root” interfaces of Java collection classes.

A collection is an object that represents a group of objects (such as the classic Vector class). A collections framework is a unified architecture for representing and manipulating collections, enabling collections to be manipulated independently of implementation details.

In our first lesson on collections we look at the collection interfaces and classes using various diagrams and explain the terminology used when dealing with collections.

Jun 12, 2019 · UML class diagram for List API in the Java Collections Framework.

All collections frameworks contain the following: Interfaces: These are abstract data types that represent collections. Interfaces allow collections to be manipulated independently of the details of their representation. In object-oriented languages, interfaces generally form a hierarchy.

Feb 17, 2009 · First of all, “Collection” and “Collections” are two different concepts. As you will see from the hierarchy diagram below, “Collection” is a root interface in the Collection hierarchy but “Collections” is a class which provide static methods to manipulate on some Collection types.

Java provides a set of standard collection classes that implement Collection interfaces. Some of the classes provide full implementations that can be used as-is and others are abstract class, …

The collections framework is a unified architecture for representing and manipulating collections, enabling them to be manipulated independently of the details of their representation. It reduces programming effort while increasing performance.