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Java 8 Essential Training

Understanding inheritance and polymorphism

From the course: Java 8 Essential Training

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  • Course details

    If you want to build applications for mobile devices, desktop computers, or the web, you need to know Java. This course provides the foundation for learning Java SE (Standard Edition), so you can build your first apps or start exploring the language on your own. Author David Gassner shows how to install Java and the IntelliJ IDEA IDE, and start working with variables, data types, keywords, and other critical language components. He also helps you control program flow with conditional logic and loops, store data with the Java Collections Framework, and understand how Java implements object-oriented coding principles such as inheritance and polymorphism.

    Instructor

    • Click here to view David Gassner’s instructor page

      David Gassner

      Managing Staff Instructor, LinkedIn Learning Technology Library at LinkedIn

      David Gassner is the author of over 60 video-based technical training courses for software developers.

      David is a senior staff instructor who specializes in development platforms and programming languages including Android and Java. He currently creates training content for Android developers and content that covers multiple programming languages including Java, C#, Visual Basic, and Go. He was formerly the president and founder of Bardo Technical Services, an Adobe Solutions Network Training Provider. As an Adobe Certified Expert, he wrote courseware for Adobe and delivered extensive training on Flex, ColdFusion, Dreamweaver and Flash. He was the author of Wiley's Flex 3 Bible and Flash Builder 4 and Flex 4 Bible. He most recently designed and developed Audio Cues—an Android app for running sound in live performances—which is available in the Google Play store.

    Skills covered in this course

  • Welcome

    - I previously described encapsulation but there are two other concepts that you need to master to be a great object-oriented programmer, Inheritance and Polymorphism. Inheritance means that there's a relationship between classes in your application that lets you inherit or extend functionality from one class to another. Not all object-oriented languages are the same, for example, C++ supports multiple inheritance, but in Java, there's only single inheritance. Each class can extend or inherit functionality from only one other class. This actually makes it a lot easier to manage your code. If you run into a bug, that bug can either be in the class that you're working on, or in its direct superclass, or in its superclass, and so on. But the issue has to be somewhere in that very linear path. But Java does allow you to implement multiple interfaces in a single class. We'll get to interfaces later. There are a number of different ways to describe an inheritance relationship, but these are…

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Contents