Join David Gassner for an in-depth discussion in this video Understanding inheritance and polymorphism, part of Java 8 Essential Training.
- 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 just different vocabularies.…
Author
David Gassner
Released
7/24/2015- Understanding the history and principles of Java
- Installing Java, IntelliJ IDEA, and BlueJ
- Creating a Java project
- Working with variables, values, and expressions
- Working with object data types
- Building, comparing, and parsing strings
- Debugging and exception handling
- Creating loops and reusable code
- Passing arguments by reference or value
- Using simple and complex arrays
- Creating custom classes
- Understanding inheritance and polymorphism
- Managing files with Java libraries
- Documenting code with Javadoc
- Packaging classes in JAR files
Skill Level Beginner
Duration
Views
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Introduction
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Welcome59s
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Is this course for you?3m 22s
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Using the exercise files5m 5s
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1. What Is Java?
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The history of Java5m 57s
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Java syntax and compilation5m 26s
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2. Installing the Software
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Installing Java on Windows3m 49s
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Installing Java on OS X2m 50s
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Installing BlueJ1m 52s
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3. Getting Started
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Hello World5m 44s
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4. Working with Variables
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Converting numeric values5m 37s
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Using Java operators6m 11s
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5. Working with Objects
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Using the String class5m 5s
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Comparing string values5m 51s
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Parsing string values3m 13s
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Working with dates and times8m 35s
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6. Exception Handling and Debugging
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Debugging with IntelliJ IDEA5m 18s
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Throwing custom exceptions3m 19s
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7. Managing Program Flow
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Using the switch statement4m 51s
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Creating looping code blocks5m 23s
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8. Using Data Collections
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Using simple arrays6m 32s
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Using two-dimensional arrays4m 17s
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9. Creating Custom Classes
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Understanding encapsulation7m 19s
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Using constructor methods4m 56s
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10. Working with Inheritance
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11. Using Common Java Libraries
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12. Preparing a Java Application for Deployment
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Conclusion
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Next steps1m 37s
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Video: Understanding inheritance and polymorphism