Questions and Answers
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?
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What is the significance of a Deque in the Java Collections Framework?
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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.
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