Abstract Classes and Interfaces Quiz

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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?

<p>True (A)</p> Signup and view all the answers

A class can implement multiple interfaces.

<p>True (A)</p> Signup and view all the answers

What is output?

<p>In Child Class Teacher</p> Signup and view all the answers

UML uses italics to denote ___ classes.

<p>abstract</p> Signup and view all the answers

Concrete classes do not have any abstract methods.

<p>True (A)</p> Signup and view all the answers

Create the following inheritance? Class Student inherits from abstract class Person with only member printInfo() of class Person accessible to class Student.

<p>Student extends Person</p> Signup and view all the answers

A(n) ___ guides the design of subclasses but cannot be instantiated as an object.

<p>abstract class</p> Signup and view all the answers

Create a UML diagram that best represents the relationship depicted in the following code.

<p>UML Diagram for Person class and its subclasses.</p> Signup and view all the answers

A(n) ___ provides abstract methods and no other code.

<p>interface</p> Signup and view all the answers

A class can implement multiple interfaces.

<p>True (A)</p> Signup and view all the answers

What is output?

<p>Error: Vehicle is abstract and cannot be instantiated</p> Signup and view all the answers

A ___ diagram visualizes static elements of a program, such as the variables and functions.

<p>structural</p> Signup and view all the answers

Concrete classes do not have any abstract methods.

<p>True (A)</p> Signup and view all the answers

What are classes?

<p>A class encapsulates data and behavior to create objects.</p> Signup and view all the answers

What is Inheritance?

<p>Inheritance allows one class (a subclass) to be based on another class (a base class or superclass).</p> Signup and view all the answers

What are Abstract classes?

<p>A class that guides the design of subclasses but cannot itself be instantiated as an object.</p> Signup and view all the answers

What is a UML?

<p>A language for software design that uses different types of diagrams to visualize the structure and behavior of programs.</p> Signup and view all the answers

What is a structural diagram?

<p>Visualizes static elements of software, such as the attributes (variables) and operations (methods) used in the program.</p> Signup and view all the answers

What is a behavioral diagram?

<p>Visualizes dynamic behavior of software, such as the flow of an algorithm.</p> Signup and view all the answers

What is a class diagram?

<p>A structural diagram that can be used to visually model the classes of a computer program, including methods and attributes.</p> Signup and view all the answers

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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 the Shape interface using public 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 from Teacher, which in turn inherits from People.
  • The Teacher class output states "In Child Class Teacher" when PrintInfo 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 the printInfo() 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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