Java OOP: Multi-level Inheritance
Java
| Intermediate
- 9 videos | 56m 34s
- Includes Assessment
- Earns a Badge
In this course, learners will focus on creation of multilevel inheritance in Java and how such hierarchies include child and grand-child classes that all inherit from a common ancestor base class. Begin with an introduction to multilevel inheritance, and how you can access multiple derived classes by using a base class in multilevel inheritance. Explore use of the instanceof operator, where you can check that an object is an instance of every class in its inheritance hierarchy. Concerning the Is-A Relationship, you will learn how to apply multilevel inheritance when every object of the derived class is an object of the base class, but not every object of the base class is an object of the derived class. Examine downcasting; see how to upcast multiple levels; learn why downcasting is very dangerous; and perform various upcasting operations. After moving on to multilevel inheritance hierarchies, you will construct two parallel base classes and derived classes for each of those base classes. Finally, explore use of the extends keyword, recognizing situations where multiple inheritance is allowed.
WHAT YOU WILL LEARN
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Discover the key concepts covered in this course
Recognize how you can access multiple derived classes by using a base class in multilevel inheritance
Use the instanceof operator to check that an object is an instance of every class in its inheritance hierarchy
Recognize how to apply multilevel inheritance when every object of the derived class is an object of the base class, but not every object of the base class is an object of the derived class
Recognize how you can upcast multiple levels up and how downcasting is very dangerous -
Perform various casting operations
Construct two parallel base classes and derived classes for each of those base classes
Recognize situations where multiple inheritance is not allowed
Summarize the key concepts covered in this course
IN THIS COURSE
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2m 7s
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6m 32sUpon completion of this video, you will be able to recognize how you can access multiple derived classes by using a base class in multilevel inheritance. FREE ACCESS
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3. The instanceof Operator5m 13sIn this video, you will use the instanceof operator to check that an object is an instance of every class in its inheritance hierarchy. FREE ACCESS
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4. The Is-A Relationship6m 2sAfter completing this video, you will be able to recognize how to apply multilevel inheritance when every object of the derived class is an object of the base class, but not every object of the base class is an object of the derived class. FREE ACCESS
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5. Downcasting7m 18sAfter completing this video, you will be able to recognize how you can upcast multiple levels up, and how downcasting is very dangerous. FREE ACCESS
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6. Up-casting9m 14sFind out how to perform various types of casting. FREE ACCESS
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7. Multilevel Inheritance Hierarchies10m 2sFind out how to construct two parallel base classes and two derived classes for each of those base classes. FREE ACCESS
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8. The extends Keyword8m 32sAfter completing this video, you will be able to recognize situations where multiple inheritance is not allowed. FREE ACCESS
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9. Course Summary1m 34s
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