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In Java, we often need to write programs that work with groups (or collections) of objects. Recall that an array is an object that holds multiple objects of the same type (also known as its elements) but is limited by its fixed size and functionality. Java provides a Collection Framework to help overcome the limits of an array and provide more complex functionality to meet different collection needs.

The collection framework provides data structures (through interfaces and implementing classes) and algorithms, which perform common tasks on collections. The collection framework allows us to focus on the important parts of our program and not on low-level implementation details (like needing to implement a dynamic sizing collection).

The collection framework provides a hierarchical relationship between its interfaces, making the various implementations compatible with each other and thus making our code scalable and flexible. All the interfaces in the collections framework are generic, which allows us to use optimized and tested “plumbing” for our specific data types.

As we go through the lesson we will explore the collection framework interfaces and implementations, their relationship to generics, and the computations we can perform.

Instructions

Take a look at the collection framework hierarchy and how they relate to each other.

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