Map in Java
The article explains the concept of Map in Java, a data structure that stores data as key-value pairs within the Java Collections Framework. It highlights that each key in a Map is unique and used for fast data retrieval, similar to a dictionary. The article also covers common implementations like HashMap, LinkedHashMap, and TreeMap, along with key methods and use cases.
- ▪A Map in Java stores data in key-value pairs where each key is unique.
- ▪Common Map implementations include HashMap for fast unordered storage, LinkedHashMap for insertion order, and TreeMap for sorted keys.
- ▪Key Map methods include put(), get(), remove(), containsKey(), and keySet().
- ▪Maps are used for fast lookups, storing related data pairs, and when unique keys are required.
- ▪Examples of Map usage include mapping student IDs to names, usernames to passwords, and product IDs to prices.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3528439) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Vidya Posted on May 2 Map in Java #java #beginners #programming #map What is Map in Java Collections? A Map in Java (from Java Collections Framework) is a data structure that stores data in key–value pairs.
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