Mapping Relationships in Java: Overriding Methods and Using Access Modifiers
Java
| Intermediate
- 15 videos | 2h 1s
- Includes Assessment
- Earns a Badge
Method overriding is a way in which a derived class can redefine - and override - the implementation of a method already defined in a base class. By overriding only those methods you absolutely need to and relying on the base class implementations for all others, you get a lot done with relatively little new code. Use this course to learn how to carry out this technique. Explore the somewhat surprising behavior of static methods and the phenomenon known as hiding. Use the final keyword to mark member variables, member functions, and even entire classes. Use the abstract keyword to indicate a given method is not implemented. Study the semantics of the access modifiers public, private, protected, and package-private. When you're done, you'll recognize how overriding differs from hiding, the semantics of access modifiers, and how abstract classes are used.
WHAT YOU WILL LEARN
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Discover the key concepts covered in this course
Override methods to have different method implementations in derived classes
Use the super keyword in overridden methods
Identify method hiding when redefining static methods with the same name
Use the final modifier to restrict a field from being initialized except in constructors
Use the final modifier with methods to prevent overriding and with classes to prevent inheritance
List the characteristics of an abstract class
Use abstract base classes in inheritance hierarchies -
Use the private access modifier to restrict access to fields and methods
Contrast the restrictions offered by the public and private access modifiers
Use factory methods to instantiate objects with private constructors
Use the protected access modifier to restrict access to derived classes and classes in the same package
Investigate the nuances of the protected access modifier
Use the default modifier to restrict access to other classes in the same package
Summarize the key concepts covered in this course
IN THIS COURSE
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1m 49s
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9m 44s
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3. Invoking Base Class Methods Using super()10m 45s
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4. Identifying Method Hiding7m 3s
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5. Using the Final Modifier with Fields10m 5s
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6. Using the Final Modifier with Methods and Classes7m 18sIn this demo, you'll learn how to use the final modifier with methods and classes. You'll see how it applies to classes and methods. In the preceding demo, you've seen the use of the final modifier as applied to member variables. Now, you'll learn how it applies to classes and methods. FREE ACCESS
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7. Characterizing Abstract Classes8m 46sIn this demo, you'll learn how to list the characteristics of an abstract class. An abstract class cannot be directly instantiated and must be extended before being instantiated. You'll also learn that abstract classes often have abstract methods which are not implemented, they're just defined. This makes it clear what the interface of an object is. FREE ACCESS
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8. Using Abstract Classes in Inheritance Hierarchies11m 35s
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9. Using the Private Access Modifier8m 39s
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10. Using the Public and Private Modifiers5m 10s
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11. Using Factory Methods to Instantiate Objects7m 46s
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12. Using the Protected Access Modifier9m 5s
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13. Investigating Protected Access Modifier Nuances10m 6s
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14. Using the Default Access Modifier9m 13s
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15. Course Summary2m 59s
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