Hashtable Get Java, util and is a concrete implementation of a Dictionary. There are few more differences between HashMap and Hashtable class, you can read them in detail at: Difference between HashMap and Hashtable. It returns NULL when the table contains no such mapping for the key. Feb 17, 2020 · Hashtable Class get () method: Here, we are going to learn about the get () method of Hashtable Class with its syntax and example. However, Java 2 re-engineered Hashtable so that it also implements the Map interface. 4 days ago · The Hashtable class in Java is a legacy data structure that stores data in key-value pairs using a hash table. util package that implements the Map interface and is used to store key-value pairs with unique keys. It is part of the Collections Framework and provides synchronized data access. get () method is a built-in method of the java. In this Hashtable tutorial, we will learn it’s internals, constructors, methods, use-cases and other important points. Mar 29, 2026 · In this chapter, you will learn about the Java Hashtable class, its working, features, and how it stores and retrieves data using a hash table mechanism. To successfully store and retrieve objects from a hashtable, the objects used as keys must implement the hashCode method and the equals method. Java can help reduce costs, drive innovation, & improve application services; the #1 programming language for IoT, enterprise architecture, and cloud computing. As of the Java 2 platform v1. Java Hashtable class is an implementation of hash table data structure. Hashtable was part of the original java. This method is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. Sep 11, 2022 · This class implements a hash table, which maps keys to values. What is Java Hashtable? Java Hashtable is a class in the java. If a thread-safe implementation is not needed, it is recommended to use HashMap in place of Hashtable. In lines 8 to 12, we insert values in the HashTable by using the Hashtable. May 19, 2025 · Let’s take various example programs for performing operations based on methods of hash table in Java. It is very much similar to HashMap in Java, with most significant difference that Hashtable is synchronized while HashMap is not. 2, this class was retrofitted to implement the Map interface, making it a member of the Java Collections Framework. Table of Contents 1. Description The Java Hashtable get (Object key) method is used to get the value to which the specified key is mapped in this hashtable. util. This class implements a hash table, which maps keys to values. May 19, 2025 · The Hashtable. Hashtable is similar to HashMap except it is synchronized. In line 6, we declare a HashTable consisting of Integer type keys and String type values. Unlike the new collection implementations, Hashtable is synchronized. Hashtable class. put() method. Apr 11, 2016 · I'm trying to create a method which iterates through a hashtable and returns the key as a string, whats the best way to go about this? EDIT: copied from comment Sorry if I didn't make it more cle As of the Java 2 platform v1. Any non- null object can be used as a key or as a value. Any non-null object can be used as a key or as a value. Example 1: Let’s write a Java program where we will perform various operations such as adding, removing, checking hash table is empty or not before adding elements, and size. Dec 22, 2025 · This blog post aims to provide a comprehensive guide to understanding and using HashTable in Java, covering its fundamental concepts, usage methods, common practices, and best practices. .
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