Core Java Collections Quiz

What is the purpose of the Collection framework in Java?

• The purpose of the Collection framework in Java is to create graphical user interfaces (GUIs).

• The purpose of the Collection framework in Java is to provide a way to store and retrieve data from a database.

• The purpose of the Collection framework in Java is to provide a unified architecture for representing and manipulating collections of objects.

• The purpose of the Collection framework in Java is to handle exceptions and errors in the code.

Which interface is the root interface of the Java Collection framework?

• List

• Collection

• Set

• Map

What is the difference between List and Set in Java?

• List allows duplicate values, while Set allows duplicate values.

• List does not allow duplicate values, while Set allows duplicate values.

• List allows duplicate values, while Set allows only unique values.

• List allows duplicate values, while Set does not allow duplicate values.

Which collection class allows duplicate elements in Java?

• ArrayList

• LinkedList

• TreeSet

• HashSet

What is the difference between ArrayList and LinkedList in Java?

• ArrayList uses a singly linked list for storage and provides fast insertions and deletions.

• ArrayList uses a dynamic array for storage and provides fast random access, while LinkedList uses a doubly linked list for storage and provides fast insertions and deletions.

• ArrayList and LinkedList both use a doubly linked list for storage and provide fast insertions and deletions.

• LinkedList uses a dynamic array for storage and provides fast random access.

Which interface provides a way to access elements in a collection using an iterator?

• Enumerator

• Iterator

• Accessor

• Retriever

What is the purpose of the Map interface in Java?

• The purpose of the Map interface in Java is to store only keys and perform operations on them.

• The purpose of the Map interface in Java is to store key-value pairs and perform operations on them.

• The purpose of the Map interface in Java is to store only values and perform operations on them.

• The purpose of the Map interface in Java is to store key-value pairs but not perform any operations on them.

Which collection class allows key-value pairs in Java?

• ArrayList

• LinkedList

• HashSet

• HashMap

What is the difference between HashMap and HashTable in Java?

• HashMap and HashTable have the same performance.

• HashMap and HashTable have the same synchronization.

• HashMap and HashTable differ in terms of synchronization, thread-safety, handling of null values, and performance.

• HashMap and HashTable handle null values in the same way.

Which interface provides a way to sort elements in a collection in Java?

• Orderable

• Comparable

• Comparator

• Sorter