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Lecture Notes Chapter #11 Abstract Classes & Interfaces Abstract Classes parent class more abstract child class more concrete, i.e., less abstract class o class with an abstract modifier o class containing
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How to fill out abstract classes amp interfaces
How to fill out abstract classes amp interfaces
01
To fill out abstract classes:
02
- Define the abstract class using the 'abstract' keyword.
03
- Specify abstract methods (methods without a body) in the abstract class.
04
- Implement the abstract methods in the concrete subclasses of the abstract class.
05
- Use the 'extends' keyword to inherit from the abstract class.
06
- Create objects from the concrete subclasses and use the inherited methods.
07
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To fill out interfaces:
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- Define the interface using the 'interface' keyword.
10
- Declare method signatures (methods without a body) in the interface.
11
- Implement the interface in the classes that need to adhere to its contract.
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- Use the 'implements' keyword to indicate that a class implements an interface.
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- Define the bodies of the interface methods in the implementing classes.
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- Create objects from the implementing classes and use the interface methods.
Who needs abstract classes amp interfaces?
01
Abstract classes and interfaces are useful in object-oriented programming for:
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- Creating common behavior and properties shared by multiple related classes.
03
- Defining a contract for a class to adhere to without specifying its implementation.
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- Allowing polymorphic behavior, where objects of different classes can be treated interchangeably.
05
- Facilitating code organization, modularity, and reusability.
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- Encouraging loose coupling and separation of concerns.
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- Enabling the creation of framework-like structures.
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- Supporting the concept of inheritance and abstraction in software design.
09
- Building extensible and maintainable codebases.
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What is abstract classes amp interfaces?
Abstract classes and interfaces are used in object-oriented programming to define blueprints for classes. Abstract classes can have both abstract and concrete methods while interfaces only have abstract methods.
Who is required to file abstract classes amp interfaces?
Developers and programmers who are implementing object-oriented programming concepts may be required to use abstract classes and interfaces in their code.
How to fill out abstract classes amp interfaces?
To create an abstract class, you use the keyword 'abstract' in the class definition. To create an interface, you use the 'interface' keyword. Both abstract classes and interfaces can then be implemented by other classes.
What is the purpose of abstract classes amp interfaces?
The purpose of abstract classes and interfaces is to provide a way to define common behavior that multiple classes can share without specifying implementation details. This promotes consistency and reusability in code.
What information must be reported on abstract classes amp interfaces?
Abstract classes and interfaces do not require any specific information to be reported. They are used as templates for other classes to inherit from and implement.
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