Untitled Quiz

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Questions and Answers

What are the main components of a class?

Data and processing
Attributes and methods (correct)
Variables and functions
Properties and behaviors

What is the purpose of a constructor?

To initialize the class attributes (correct)
To execute the main method
To define the class name
To create instances of a class (correct)

A package is a collection of classes that are related to each other.

True (A)

What is the purpose of the `this` keyword in Java?

The <code>this</code> keyword refers to the current object within a class. It is useful for distinguishing between local variables and class attributes that have the same name, and also for invoking constructors from within another constructor. Signup and view all the answers

What is the difference between procedural programming and object-oriented programming?

Object-oriented programming focuses on objects, while procedural programming focuses on procedures. (B) Signup and view all the answers

What is the role of the `main` method in a Java program?

The <code>main</code> method is the entry point of a Java program. (A), The <code>main</code> method is executed when the program starts. (C) Signup and view all the answers

What is method overloading in Java?

Method overloading allows a class to have multiple methods with the same name but different parameter lists. This enables flexibility in how you call a method based on the data you want to provide. Signup and view all the answers

Which access modifier allows member variables or methods to be accessible only within the declaring class?

private (B) Signup and view all the answers

A `getter` method is used to the value of a private attribute, while a `setter` method is used to it.

retrieve, modify Signup and view all the answers

The `null` keyword represents a reference that does not point to any object.

True (A) Signup and view all the answers

Explain the concept of garbage collection in Java.

Garbage collection is an automatic process in Java that reclaims unused memory automatically. It identifies objects that are no longer referenced by the program and frees up the memory they occupy for reuse. Signup and view all the answers

What is the purpose of the `Scanner` class in Java?

To read input from the keyboard (B) Signup and view all the answers

The `import` statement is used to make classes from other packages available for use in your program.

True (A) Signup and view all the answers

What is encapsulation in object-oriented programming?

The process of hiding data and methods within a class, making them accessible only through defined interfaces. (A) Signup and view all the answers

Which access modifier can be used to make members of a class accessible only to the class itself, its derived classes, and classes within the same package?

protected (D) Signup and view all the answers

What is the difference between public and private access modifiers in Java?

The <code>public</code> access modifier makes members accessible from any class, while the <code>private</code> access modifier restricts access to members only within the declaring class. Signup and view all the answers

Explain the concept of inheritance in object-oriented programming.

Inheritance allows one class (child class) to inherit properties and methods from another class (parent class). It promotes code reusability, helps model real-world relationships between objects, and makes code more organized and maintainable. Signup and view all the answers

How does inheritance differ from composition in object-oriented programming?

Inheritance is a 'is-a' relationship, where a child class inherits properties and methods from a parent class. Composition is a 'has-a' relationship, where one class contains an instance of another class as a member. Inheritance often focuses on general-to-specific relationships, while composition lets you build objects from other objects for more complex structures. Signup and view all the answers

Flashcards

Object-Oriented Programming (OOP)

A programming paradigm where programs are structured as collections of interacting objects.

Object

A software entity with data (attributes) and actions (methods).