Java Collection Framework

What is a collection in Java?

• A command for storing and manipulating a group of objects

• A set of classes and interfaces that provides a ready-made architecture

• A unified architecture for storing and manipulating a group of objects

• A group of individual objects represented as a single unit

What are the advantages of the Java collection framework?

• Consistent API, reduces programming effort, and improves performance

• Provides a basic set of interfaces and methods for all collections

• Allows for searching, sorting, insertion, manipulation, and deletion

• Defines a common interface and correlation among different collections

What is a framework in Java?

• A set of classes and interfaces that provides a ready-made architecture

• A unified architecture for storing and manipulating a group of objects

• A framework for storing and manipulating a group of objects

• A group of individual objects represented as a single unit

What is the purpose of the List interface in Java?

• To store and maintain an ordered collection

• To provide index-based methods for manipulating elements

• To accommodate duplicate elements and store null elements

• To iterate the list in both forwards and backwards directions

Which of the following is an implementation class of the List interface?

• ArrayList

• StringList

• Stack

• Vector

What is the difference between a class and an interface in Java?

• A class is a blueprint for objects, while an interface is a blueprint for classes

• A class can have both methods and variables, while an interface can only have methods

• A class represents a set of properties or methods common to all objects of one type

• An interface specifies what a class must do, not how it does it

Which method is used to add an object to a collection?

• add(Object)

• addAll(Collection)

• clear()

• contains(Object)

What does the remove(Object) method do?

• Removes an object from the collection

• Removes the element at a specific index in the List

• Returns true if the collection contains the specified element

• Compares the specified object with the collection for equality

What is the purpose of the Set interface in Java?

• To provide an ordered collection

• To store and maintain a group of objects

• To implement a mathematical set

• To allow the inclusion of duplicate elements

Which of the following is an implementation class of the Set interface?

• HashSet

• LinkedHashSet

• ArrayList

• LinkedList