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In the domain of concurrent programming in Java, controlling access to shared resources is crucial. This need is often fulfilled through synchronization mechanisms such as locks and monitors. However, these tools typically only protect a single instance of a resource. What if you have multiple copies of a resource and you need to control access to them? This is where Semaphores come into play. In this article, we will delve into the usage of Semaphores to protect more than one copy of a resource in Java. Understanding Semaphores Semaphore is a synchronization mechanism that controls access to one or more ... Read More
In the world of Java programming, Google's open-source Guava library introduces powerful utilities that bolster the Java developer's toolkit. Among these, Guava's Collectors bring a unique enhancement, enabling a seamless transition of data from streams to immutable collections. This article provides a detailed guide on leveraging Guava's Collectors for collecting streams into immutable collections in Java. The Power of Immutable Collections Immutable objects have a fixed state after their creation, which means they cannot be modified. This property brings a host of benefits, including simplicity, thread-safety, and the guarantee that they will always remain in a consistent state. Java's core ... Read More
In the dynamic world of Java programming, achieving optimal performance is often the central goal of developers. In this realm, different wait strategies, including busy spinning, can play a pivotal role. This article aims to provide a detailed understanding of busy spinning as a wait strategy in Java, why it's important, and how it can be efficiently utilized. Understanding Wait Strategies In concurrent programming, wait strategies determine how a thread should wait when there is no work available for it. Different wait strategies can drastically impact the performance of concurrent applications. A commonly used approach is blocking, where a thread ... Read More
Geometrical computations play an essential role in various domains of computer science such as computer graphics, gaming, and computational geometry. Among the myriad of geometric operations, determining whether two lines intersect is a fundamental problem. In this article, we'll take an in-depth look at how to test if two lines intersect using the above/below primitive method in Java Understanding the Concept The above/below primitive is a fundamental concept in computational geometry. It helps determine whether a point lies above, below, or on a line. To assess whether two lines intersect in the two-dimensional plane, one needs to check if the ... Read More
TreeMap is a class of Java Collection Framework that implements NavigableMap Interface. It stores the elements of the map in a tree structure and provides an efficient alternative to store the key-value pairs in sorted order. Note that while creating objects of TreeMap we need to use the comparable interface so that we can maintain the sorting order of its elements. In this article, we are going to discuss a few Java programs to create TreeMap objects using comparable interface. Java Program to create TreeMap Objects using Comparable Interface Before jumping to the Java program ... Read More
In the vast landscape of Java programming, one of the most intriguing aspects is its choice of variable naming. Among these, the use of the underscore (_) is a topic that has sparked much discussion and debate. This article will delve into the usage of underscore as a variable name in Java, exploring its evolution across different Java versions and its current status in the Java programming world. The Saga of the Underscore in Java A unique aspect of Java programming lies in its allowance for naming variables. Underscore, or "_", is a valid character that can be used in ... Read More
User registration is a fundamental part of building interactive and personalized applications. Back4App, an efficient Backend as a Service (BaaS) platform, can streamline this process, making user registration in Android apps an effortless task. In this article, we will take a comprehensive look at how you can implement user registration in your Android application using Back4App. Understanding Back4App Back4App, built upon the open-source Parse Server, offers an easy-to-use, scalable, and customizable backend for mobile and web applications. It simplifies complex backend operations like data storage, user authentication, and real-time synchronization, enabling developers to focus on creating great user experiences Setting ... Read More
In the sphere of Android application development, user authentication forms the cornerstone of ensuring app security and personalized user experience. In this arena, a tool that is gaining popularity among developers worldwide is Back4App. This article explores how Back4App can be harnessed to implement user login functionality in Android applications. Introduction to Back4App Back4App is an open-source, scalable, and flexible backend as a service (BaaS) platform. It leverages Parse, a leading open-source backend framework, which simplifies backend operations like user authentication, data storage, and real-time notifications. Setting Up Back4App for User Login in Android Before diving into the code, let's ... Read More
Speedometer charts are a fantastic method to dynamically and engagingly display progress or performance and visually depict data. Whether you want to track important metrics, show achievement levels, or show survey findings, a speedometer chart may provide your Excel reports a polished, clear look. In this tutorial, we'll walk you through each step of making an Excel speedometer chart. We'll go through the essential ideas, look at various design alternatives, and give you useful advice on how to improve and customise your chart to meet your individual requirements. Don't worry if you're new to Excel or only have a little ... Read More
"int cannot be dereferenced", a common error in Java that may occur while converting a variable of integer type into String or while comparing it with other primitive type variables. It might be difficult to debug for a beginner programmer, but once we get the alternative ways of converting and comparing integers, it will become a piece of cake for us. Try to stick with us till the end of this article to find the reasons and possible solutions for fixing the 'int cannot be dereferenced error'. How to Fix int cannot be dereferenced Error in Java ... Read More