Questions and Answers
In the following UML class diagram, + calculateScore(): int depicts a ___.
method name which returns an int value and with a public access specifier
Which class definition requires Square to follow the API of Shape?
public class Square implements Shape
What is output?
Error: Vehicle is abstract and cannot be instantiated
Consider a Dog class and a Mammal class. Which is true?
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A class can implement multiple interfaces.
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What is output?
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UML uses italics to denote ___ classes.
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Concrete classes do not have any abstract methods.
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Create the following inheritance? Class Student inherits from abstract class Person with only member printInfo() of class Person accessible to class Student.
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A(n) ___ guides the design of subclasses but cannot be instantiated as an object.
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Create a UML diagram that best represents the relationship depicted in the following code.
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A(n) ___ provides abstract methods and no other code.
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A class can implement multiple interfaces.
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What is output?
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A ___ diagram visualizes static elements of a program, such as the variables and functions.
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Concrete classes do not have any abstract methods.
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What are classes?
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What is Inheritance?
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What are Abstract classes?
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What is a UML?
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What is a structural diagram?
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What is a behavioral diagram?
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What is a class diagram?
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Study Notes
Abstract Classes and Interfaces
- The method
calculateScore(): int
suggests a publicly accessible method returning an integer. - Class
Square
must implement theShape
interface usingpublic class Square implements Shape
. - Instantiation error occurs when trying to create an instance of an abstract class, e.g.,
Vehicle
. - An abstract class, like
Mammal
, is a class that cannot be instantiated directly. - A class can implement multiple interfaces, demonstrating polymorphism in object-oriented programming.
- Inheritance is demonstrated where a
Principal
class inherits fromTeacher
, which in turn inherits fromPeople
. - The
Teacher
class output states "In Child Class Teacher" whenPrintInfo
is called. - UML notation uses italics to represent abstract classes.
- Concrete classes have no abstract methods, meaning they can be instantiated.
- To inherit from an abstract class
Person
,Student
accesses theprintInfo()
method. - An abstract class serves as a template for subclasses, unable to form instances on its own.
- An interface exclusively consists of abstract methods and lacks any implementation code.
- Structural diagrams visualize the static components of a system, such as variables and functions.
- Classes serve as blueprints for objects, encapsulating data and behavior.
- Inheritance allows subclasses to derive characteristics and behavior from a base class.
- Abstract classes guide the design of subclasses without allowing direct instantiation.
- UML (Unified Modeling Language) facilitates software design using various diagrams for structure and behavior analysis.
- Structural diagrams depict static elements such as attributes and operations in a program.
- Behavioral diagrams illustrate the dynamic aspects of a system, focusing on actions and interactions.
- Class diagrams provide a visual representation of class structures, detailing attributes and methods involved in a program.
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Description
Test your understanding of abstract classes and interfaces in object-oriented programming. This quiz covers concepts like polymorphism, inheritance, and the implementation of interfaces. Prepare to demonstrate your knowledge of key principles and terminology.