Java Collections Framework

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What is the difference between a List and a Set in the Java Collections Framework?

A list is an ordered collection of elements that allows duplicate entries, while a set is a collection that does not allow duplicate entries.

Explain the purpose of a Queue in the Java Collections Framework.

A queue is a collection that orders its elements in a specific order for processing.

What is the role of a Map in the Java Collections Framework?

A map is a collection that maps keys to values, with no duplicate keys allowed.

Why is the Map interface not technically considered a part of the Collection interface in the Java Collections Framework?

Maps are treated differently as they need different methods due to being key/value pairs.

What is the significance of a Deque in the Java Collections Framework?

A Deque is a subinterface of Queue that allows access at both ends.

Study Notes

  • A collection is a single object containing multiple objects in Java, managed by the Java Collections Framework in java.util.
  • There are four main interfaces in the Java Collections Framework: List, Set, Queue, and Map.
  • A List is an ordered collection with duplicate entries and elements are accessed by index.
  • A Set is a collection with no duplicate entries.
  • A Queue is a collection that orders elements for processing and a Deque is a subinterface of Queue that supports access at both ends.
  • A Map is a collection that maps keys to values, with no duplicate keys, and is considered part of the Java Collections Framework despite not implementing the Collection interface.
  • Figure 9.1 depicts the Collection interface, its subinterfaces, and classes implementing the interfaces.
  • The Collections API provides common methods to the implementing classes, which are discussed in the following section.

Test your knowledge about the Java Collections Framework and the main interfaces it includes. Learn about lists, sets, and queues in Java.

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