OOP Concepts in Java
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Questions and Answers

What is the main purpose of encapsulation in object-oriented programming?

  • To hide internal implementation details from the outside world (correct)
  • To show only essential features to the outside world
  • To inherit properties from a parent class
  • To override methods in a child class

    • What is the purpose of the wait() method in multithreading?

  • To coordinate thread execution (correct)
  • To interrupt a thread
  • To wait for a thread to finish
  • To create a new thread

    • What is the main component of a JavaFX application?

  • Stage
  • Scene (correct)
  • Node
  • Button

    • What is the Single Responsibility Principle (SRP) in OOP?

    <p>A class should have only one reason to change</p> Signup and view all the answers

    What is the purpose of method overriding in OOP?

    <p>To override methods in a parent class</p> Signup and view all the answers

    What is the purpose of the extends keyword in OOP?

    <p>To extend a class</p> Signup and view all the answers

    What is the purpose of the join() method in multithreading?

    <p>To wait for a thread to finish</p> Signup and view all the answers

    What is the main purpose of polymorphism in OOP?

    <p>To allow objects of different classes to respond to the same method call</p> Signup and view all the answers

    What is the purpose of the Runnable interface in multithreading?

    <p>To implement the Runnable interface</p> Signup and view all the answers

    What is the main component of a JavaFX GUI application?

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

    Study Notes

    Object-Oriented Programming (OOP) in Java

    • Class and Object:
      • A class is a blueprint or template that defines the properties and behavior of an object.
      • An object is an instance of a class, having its own set of attributes (data) and methods (functions).
    • Inheritance:
      • A child class inherits properties and behavior from a parent class.
      • Keyword: extends
    • Polymorphism:
      • Method overriding: a child class provides a different implementation of a method already defined in its parent class.
      • Method overloading: multiple methods with the same name but different parameters.
    • Encapsulation:
      • Hiding internal implementation details from the outside world.
      • Using access modifiers (public, private, protected) to control access to data and methods.
    • Abstraction:
      • Showing only essential features to the outside world while hiding internal details.

    Multithreading in Java

    • Thread: a separate flow of execution that can run concurrently with other threads.
    • Thread Creation:
      • Extending the Thread class.
      • Implementing the Runnable interface.
    • Thread Synchronization:
      • Synchronized methods and blocks to ensure thread safety.
      • Using wait() and notify() methods to coordinate thread execution.
    • Thread Communication:
      • Using join() method to wait for a thread to finish.
      • Using interrupt() method to interrupt a thread.

    JavaFX

    • JavaFX Overview:
      • A Java library for building GUI applications.
      • Replaces Swing and AWT.
    • JavaFX Components:
      • Nodes: graphical elements such as buttons, labels, and text fields.
      • Scene: the root element of a JavaFX application.
      • Stage: the window that contains the scene.
    • JavaFX Event Handling:
      • Handling events such as mouse clicks, key presses, and changes to node properties.
      • Using event handlers to respond to events.

    OOP Concepts in Java

    • Single Responsibility Principle (SRP):
      • A class should have only one reason to change.
      • Each class should have a single, well-defined responsibility.
    • Open-Closed Principle (OCP):
      • A class should be open for extension but closed for modification.
      • Using inheritance and polymorphism to achieve OCP.
    • Dependency Inversion Principle (DIP):
      • High-level modules should not depend on low-level modules, but both should depend on abstractions.
      • Using interfaces and abstract classes to achieve DIP.

    Object-Oriented Programming (OOP) in Java

    • A class is a blueprint or template that defines the properties and behavior of an object.
    • An object is an instance of a class, having its own set of attributes (data) and methods (functions).

    Inheritance

    • A child class inherits properties and behavior from a parent class using the extends keyword.

    Polymorphism

    • Method overriding: a child class provides a different implementation of a method already defined in its parent class.
    • Method overloading: multiple methods with the same name but different parameters.

    Encapsulation

    • Hiding internal implementation details from the outside world.
    • Using access modifiers (public, private, protected) to control access to data and methods.

    Abstraction

    • Showing only essential features to the outside world while hiding internal details.

    Multithreading in Java

    Thread

    • A separate flow of execution that can run concurrently with other threads.

    Thread Creation

    • Extending the Thread class.
    • Implementing the Runnable interface.

    Thread Synchronization

    • Synchronized methods and blocks to ensure thread safety.
    • Using wait() and notify() methods to coordinate thread execution.

    Thread Communication

    • Using join() method to wait for a thread to finish.
    • Using interrupt() method to interrupt a thread.

    JavaFX

    JavaFX Overview

    • A Java library for building GUI applications, replacing Swing and AWT.

    JavaFX Components

    • Nodes: graphical elements such as buttons, labels, and text fields.
    • Scene: the root element of a JavaFX application.
    • Stage: the window that contains the scene.

    JavaFX Event Handling

    • Handling events such as mouse clicks, key presses, and changes to node properties.
    • Using event handlers to respond to events.

    OOP Concepts in Java

    Single Responsibility Principle (SRP)

    • A class should have only one reason to change.
    • Each class should have a single, well-defined responsibility.

    Open-Closed Principle (OCP)

    • A class should be open for extension but closed for modification.
    • Using inheritance and polymorphism to achieve OCP.

    Dependency Inversion Principle (DIP)

    • High-level modules should not depend on low-level modules, but both should depend on abstractions.
    • Using interfaces and abstract classes to achieve DIP.

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    Description

    This quiz covers the fundamentals of object-oriented programming in Java, including classes, objects, inheritance, and polymorphism.

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