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List Set Map Interfaces Java

In Java, the Set and Map interfaces are part of the Java Collections Framework, each serving distinct purposes.

The Set interface represents a collection of unique elements, meaning it does not allow duplicate entries. It extends the Collection interface and is implemented by classes such as HashSet and TreeSet. A key characteristic of a Set is that it does not maintain any specific order of its elements ².

On the other hand, the Map interface represents a collection of key-value pairs, where each key is unique and maps to a specific value. Unlike the Set interface, the Map interface is not a subtype of the Collection interface. It provides methods for storing, retrieving, and manipulating key-value pairs, such as put(), get(), and remove(). Common implementations of the Map interface include HashMap and TreeMap ¹⁴.

Both interfaces are essential for managing collections of data in Java, each tailored to specific use cases.

Let’s learn Java Map Interface

Javarevisited

In my previous article, we discussed Java lists, queues, and sets in the Java Collection Interface. If you are not familiar with lists, queues, and sets…

Exploring Set Interface and its Implementations: HashSet and TreeSet in Java

Javarevisited

The Set interface in Java is a part of the Java Collections Framework, and it extends the Collection interface. A Set is a collection of unique elements with no specific order. This means that every e...

How to get an item from a Set in Java

Javarevisited

The mystery of the missing get method on the Java Set interface.The Set interface in Java does not have a get method. This has been the case since the Set interface was added in Java 2. The Map interf...

A Comprehensive Guide to the Map Interface and Its Implementations in Java

Javarevisited

Introduction: The Map interface in Java provides a way to store key-value pairs in a collection. It is part of the Java Collections Framework and is implemented by several classes, including HashMap a...

Iterating over maps is an important topic when it comes to working with maps in Java.

Javarevisited

Iterating over maps is an important topic when working with maps in Java. A map is a collection of key-value pairs where each key is unique and is used to retrieve the associated value. Iterating over...

Maps are an important data structure in Java that store key-value pairs.

Javarevisited

Maps are an important data structure in Java that store key-value pairs. The Map interface is implemented by various classes in Java, such as HashMap, TreeMap, and LinkedHashMap. In this article, we w...

Lists and Sets

Introduction to Programming Using Java

Section 10.2 Lists and Sets I n the previous section , we looked at the general properties of collection classes in Java. In this section, we look at some specific collection classes and how to use th...

Mastering Java Collections: Exploring Compute Methods in Maps

Javarevisited

The Map is an essential data structure in Java, frequently used to store and manage key-value pairs. Often, we need to manipulate its contents efficiently. The Java API provides several compute metho...

List vs Set

Essential Java

import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; public class SetAndListExample { public static void main( String[] args ) { System.out.println("List ...

Map

Codecademy

The Map interface is found in java.util and it allows collections to store items as key-value pairs. It is implemented in the HashMap and TreeMap classes. A Map allows its contents to be accessed as a...

Map vs. Multimap

Javarevisited

Discover a safer alternative to mapping keys to multiple values in Java.At some point in your years of coding in Java, you have probably needed a Map3cK, Collection3cV3e3e. If you haven’t needed one y...

Chapter 9 The Map interface

Think Data Structures

In the next few exercises, I present several implementations of the Map interface. One of them is based on a hash table , which is arguably the most magical data structure ever invented. Another, whic...