Java hashtable vs hashmap. This article will break down Hashtable vs Jan 14, 2025 · In the context of java hashtable vs hashmap, both data structures are integral components of Java's collection framework, yet they exhibit significant differences that influence their application in software development. HashTable is considered legacy code, the documentation advise to use ConcurrentHashMap in place of Hashtable if a thread-safe highly-concurrent implementation is desired. Hashtable was created before In Java Java has two hash table classes: HashTable and HashMap. It is not thread-safe and can't be shared between many threads without proper synchronization code whereas Hashtable is synchronized. Understand the differences between HashMap and Hashtable in Java with detailed comparison, use cases, interview Q&A, and MCQs. Hashtable and HashMap in Java Hashtable and HashMap are quite similar – both are collections that implement the Map interface. In this article, we will discuss the difference between HashMap and HashTable in Java. util package. Two popular data structures that often come up in discussions about key-value pair storage are HashMap and HashTable. These two structures are often compared, and knowing their differences can help you write better, more efficient code. HashMap runs by a lot faster because it lacks synchronization. HashMap allows one null key and multiple null values whereas Hashtable doesn't allow any null key or value. Internally, these methods work based on a general concept of hashing using buckets for storing data. Unlike HashMap, Hashtable is synchronized, which makes it thread-safe but also relatively slower in performance. Jul 23, 2025 · Hashmap vs Hashtable HashMap is non-synchronized. If you’ve ever needed to store key-value pairs, you’ve likely come across HashMap and Hashtable. Also, the put (), get (), remove (), and containsKey () methods provide constant-time performance O (1). Sep 1, 2023 · Learn about difference between hashmap and hashtable on scaler topics, along with syntax, code examples, and explanations. The data structure introduced in the Java 2 platform is an unsynchronized collection, thereby lacking thread safety. In general, you should use a HashMap. Jan 30, 2025 · Performance differences between HashMap and Hashtable can affect your Java applications in a big way. It is thread-safe and can be shared with many threads. Jun 4, 2025 · Hashtable is also a part of the legacy collection classes and is present in the java. HashTable and HashMap are member of the Java Collections Framework (since Java 2 platform v1. HashMap vs HashTable: Understanding the Key Differences In the world of data structures and algorithms, efficient data storage and retrieval are crucial for optimizing program performance. Oct 12, 2023 · This tutorial introduces the differences between Hashtable and HashMap in Java also lists some example codes to understand the topic. Feb 18, 2025 · In Java, both HashMap and Hashtable are commonly used data structures for storing key-value pairs. Jan 8, 2024 · 2. However, they have distinct differences that impact their performance and usage. Feb 11, 2025 · The Java Collections Framework is a core part of Java that helps developers manage and manipulate groups of objects efficiently. 2, HashTable was retrofitted to implement the Map interface). Hashtable is a class in Java collections framework that is used to store data in key-value pairs. .
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