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?

True (A) Signup and view all the answers

A class can implement multiple interfaces.

True (A) Signup and view all the answers

What is output?

In Child Class Teacher Signup and view all the answers

UML uses italics to denote ___ classes.

abstract Signup and view all the answers

Concrete classes do not have any abstract methods.

True (A) 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.

Student extends Person Signup and view all the answers

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

abstract class Signup and view all the answers

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

UML Diagram for Person class and its subclasses. Signup and view all the answers

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

interface Signup and view all the answers

A class can implement multiple interfaces.

True (A) Signup and view all the answers

What is output?

Error: Vehicle is abstract and cannot be instantiated Signup and view all the answers

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

structural Signup and view all the answers

Concrete classes do not have any abstract methods.

True (A) Signup and view all the answers

What are classes?

A class encapsulates data and behavior to create objects. Signup and view all the answers

What is Inheritance?

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

What are Abstract classes?

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

What is a UML?

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

What is a structural diagram?

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

What is a behavioral diagram?

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

What is a class diagram?

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

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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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.