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Apr 9, 2023 · The Dictionary class defines the following methods: get (Object key): Returns the value associated with the specified key in the dictionary, or null if the key is not found. put (Object key, Object value): Inserts a key-value pair into the dictionary. If the key already exists, its corresponding value is.
In Java, Dictionary is the list of key-value pairs. We can store, retrieve, remove, get, and put values in the dictionary by using the Java Dictionary class. In this section, we will discuss the Java Dictionary class that stores data in key-value pairs just like the Map interface.
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The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a Dictionary and a key, the associated element can be looked up. Any non- null object can be used as a key and as a value.
- Functional Interface. An interface that can contain only one abstract method/function is known as a functional interface. The term Java functional interface was introduced in Java 8.
- Lambda expressions. Lambda expressions are new features for JAVA, but it is already existing in Some other popular programming languages like Scala. Java 8 onwards supports functional programming.
- Method references. The method references are the shortened notation of lambda expressions to call a specific method. It helps to refer to methods by their names.
- forEach() method. The forEach() method works as a utility method that helps to iterate over a collection or stream. The forEach() method accepts the reference of Consumer Interface and performs a certain action on each element of it which define in Consumer.
package com.tutorialspoint; import java.util.*; public class DictionaryDemo { public static void main(String[] args) { // create a new hasthtable Dictionary d = new Hashtable(); // put some elements d.put("1", "Chocolate"); d.put("2", "Cocoa"); d.put("5", "Coffee"); // print how many times put was called System.out.println("Number of times put ...
Jul 27, 2021 · Method : get () // Get the value associated with a key public abstract V get(Object key); Note: Thorws NullPointerException - if the key is null. Method : isEmpty () // Check if the dictionary has no key public abstract boolean isEmpty(); Note: True is returned if the dictionary contains no entries. Method : put ()
Dec 30, 2023 · java import java.util.HashMap; import java.util.Map; public class DictionaryExample {public static void main(String[] args) {// Create a dictionary Map<String, Integer> dictionary = new HashMap<>(); // Add elements to the dictionary dictionary.put("apple", 10); dictionary.put("banana", 20); dictionary.put("cherry", 30); // Get an element from ...
