The LinkedHashMap serves the purpose of maintaining the precise order of element addition. It elucidates the method for accessing elements in the sequence they were inserted. In addition to storing values based on their keys, the LinkedHashMap class expands upon the functionalities of the Hash Map class and implements the Map interface. It exclusively accommodates unique elements or mappings. It affords us the flexibility to utilize various data types, such as text, float, integer, etc., for assigning keys and values. By initially reversing the elements, we can alter the order of elements in the linked hash map. Subsequently, we can ... Read More

Spring is a highly popular framework within the Java EE ecosystem. It is an open-source and lightweight framework that empowers Java developers to build reliable, scalable, and simplified business applications. The primary goal of this framework is to offer you a variety of tools for managing your business items. In contrast to conventional Java frameworks and APIs such as JSP, JDBC and Java Servlet, developing web applications is far simpler. In Spring, objects—primarily those controlled by the Spring IoC Container. It plays a significant role in the application. A Bean is nothing more than an object that a Spring Ioc ... Read More

Java programmers may create, edit, and display MS Office files using the widely used Apache POI API. Through its classes and methods, this open-source library developed by the Apache Software Foundation provides a variety of functions for turning user input data or files into Microsoft Office documents. Apache POI's versatility and reliability have made it a popular option among developers worldwide. Its broad capability and smooth integration make it an invaluable asset for any project needing MS Office file handling. The API's continuous updates and active community guarantee that it is always up to date with the newest file format ... Read More

In Java, a class is a fundamental component of object-oriented programming. It serves as a blueprint or template for defining the structure and behavior of objects. A class contains both data, represented by fields or variables, and behaviors, represented by methods or functions, which manipulate that data. In Java, a custom class is a user-defined class that allows you to create objects with specific properties and behaviors tailored to your application's requirements. It serves as a blueprint or template for creating objects of that class type. Custom classes encapsulate related data and operations into a single entity, promoting code organization, ... Read More

The Spring Boot framework incorporates all of Spring's capabilities and features because it is built upon the basis of Spring. Developers are drawn to it because of its effective production-ready environment, which frees them up to focus on the logic of the application rather than on setup and configuration. Microservices-based applications that are suitable for deployment in a production environment may be created quickly thanks to Spring Boot. Some of the key features of Spring Boot are − Auto-configuration − Spring Boot's standout feature is its auto-configuration capability. It analyzes the project's classpath and automatically configures the necessary beans ... Read More

The Spring Boot framework incorporates all of Spring's capabilities and features because it is built upon the basis of Spring. Developers are drawn to it because of its effective production-ready environment, which frees them up to focus on the logic of the application rather than on setup and configuration. Microservices-based applications that are suitable for deployment in a production environment may be created quickly thanks to Spring Boot. Some of the key features of Spring Boot are − Auto-configuration − Spring Boot's standout feature is its auto-configuration capability. It analyzes the project's classpath and automatically configures the necessary beans ... Read More

Program in Text and XML Format? In Java, a project's properties file is made up of text-based key-value pairs that are commonly stored with the .properties extension. The key-value pair of contents are presented line by line, and they are often created using notepad, Wordpad, etc. Properties files serve as valuable repositories for storing critical and confidential data. In this article, we will explore the process of creating a properties file using a Java program. The Properties class in this (java.util.Properties) package offers multiple utility store methods that facilitate the storage of properties in either Text Format or XML ... Read More

In this article, we will learn how to create a TreeMap in reverse order in java. Firstly, we need to know about TreeMap. A TreeMap in Java is a class that implements the SortedMap interface, which extends the Map interface. It is a collection that stores key-value pairs and organizes them based on their natural order or a custom Comparator provided during its creation. This approach provides efficient performance for common operations such as adding, removing, and retrieving elements from the TreeMap. It has an average time complexity of O(log n), which ensures efficient execution. Syntax for Creating a TreeMap ... Read More

In this article, we will see what are the possibilities available to create thread-safe HashSet instances and see what will be equivalent to ConcurrentHashMap for HashSet. We will also look at the benefits and drawbacks of each approach. Before JDK8 we are not able to create a Thread Safe ConcurrentHashMap because  java.util.concurrent package in JDK8 does not provide a class named ConcurrentHashSet, two new methods were added that are discussed below. ConcurrentHashMap is the Map implementation that allows us to modify the Map while iterating. The ConcurrentHashMap operations are thread-safe. ConcurrentHashMap doesn't allow null for keys and values. Ways to ... Read More

This article offers a thorough method for creating a lexicographically short N−length number string, where each digit must have an odd count. We offer an in−depth explanation of the problem statement, suggest a successful algorithmic strategy, and put it into practice using C++. The efficiency of the solution is revealed by the complexity analysis, and the accuracy and efficacy of the method are illustrated by an explanation using a test scenario Problem Statement Given a positive integer N, the task is to generate the smallest numeric string of size N which follows the lexicographical order, where each digit in the ... Read More