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Applications use data structures to store data that can be utilized throughout the lifetime of an application instance. The Java language contains several data structures known as collection types, and they can be utilized for this purpose. These data structures implement the java.util.Collection interface, which provides a variety of methods that are useful for adding, removing, and performing tasks against the data that is used with the collection. This chapter introduces some of the data structures that can be utilized within a Java application for the storage of user data. It discusses some of the data structures in detail and introduces operations performed on the data. The concepts of pipelines and streams are introduced in this chapter, and it provides recipes that demonstrate their usage.