Lesson: Introduction to Collections (The Java™ Tutorials - Oracle
https://docs.oracle.com/javase/tutorial/collections/intro/index.html
WebLesson: Introduction to Collections. A collection — sometimes called a container — is simply an object that groups multiple elements into a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data. Typically, they represent data items that form a natural group, such as a poker hand (a collection of ...
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