The word is an adaptation of the Greek root poly-, which means many, and -morphism, which means forms. In other words, the manufacturers inherit the Android OS feature and build their customizations on top of it. For example, there are different manufacturers who produce a variety of mobile devices that run Android OS, but the UI for each of the devices is different. Enables you to build a class upon the characteristics and behavior of other classes by establishing a parent-child relationship. In short, the internal mechanics of the camera app and how a mobile camera captures the photos are abstracted to let you perform the tasks that matter. You don't need to know how the camera app is built or how the camera hardware on your mobile phone actually works. For example, to take a photo with your mobile phone, all you need to do is open the camera app, point your phone to the scene that you want to capture, and click a button to capture the photo. The idea is to hide the internal implementation logic as much as possible. You don't have to worry about how components are wired internally. It encapsulates a camera, display, memory cards, and several other hardware and software components. Wraps the related properties and methods that perform action on those properties in a class. There are four basic concepts of OOP, each of which you learn more about later in this codelab: OOP helps you simplify complex, real-world problems into smaller objects.
To know how to design your classes, you need to get familiar with object-oriented programming (OOP), a framework that teaches you to enclose data, logic, and behavior in objects. Just like the house blueprint specifies multiple rooms and each room has its own design and purpose, each class has its own design and purpose. The house is the actual thing, or object, which is built based on the blueprint.
The blueprint isn't the house it's the instruction for how to build the house. A class is similar to an architect's design plan, also known as a blueprint. You can use objects or class instances interchangeably.Īs an analogy, imagine that you build a house. An object is an instance of a class that consists of data specific to that object. This codelab teaches you how to use classes and objects in Kotlin.Ĭlasses provide blueprints from which objects can be constructed.
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