Category: Java
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Why Does Processing a Sorted Array Run Faster Than Processing an Unsorted Array?
As a C++ and Java developer, I’ve always been fascinated by how seemingly minor changes in data organization can lead to significant differences in performance. Recently, I came across an interesting observation: sorting an array before processing it can significantly speed up the computation, despite the additional cost of sorting. Let’s delve deeper into this…
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When Should You Use `==` vs `.equals()` in Java to Compare Strings?
As a programmer who frequently uses Java, I’ve noticed a common pitfall that many of us encounter when dealing with string comparisons: the confusion between using == and .equals(). Recently, I stumbled across a bug in my code related to this very issue. I was using the == operator to compare strings. It seemed to…
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What Exactly is a Null Pointer Exception in Java and How Can We Resolve It?
When I first started programming in Java, one of the most common hurdles I faced was dealing with java.lang.NullPointerException. It’s something almost every Java developer encounters sooner or later. Let me explain what this exception is, why it happens, and how we can systematically resolve it. Understanding Null Pointer Exception (NPE) In Java, a Null…
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Receiving Java WebSocket Messages in JavaScript
Integrating WebSocket Communication with JavaScript and Stomp Hello, fellow developers! Today, I’d like to share with you a little odyssey I embarked on while trying to implement WebSocket communication in a JavaScript application. The goal was to make the application listen to a specific WebSocket channel, but despite my best efforts, I was hitting a…
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Enhancing Security Measures for Spring Boot App User Role-Based Endpoints
Debugging Spring Security Configuration for Role-Based Endpoint Access Recently, I embarked on an internship involving Spring Boot, where I was tasked with implementing a security framework for a web application. While I could successfully perform sign-ins using data from a database, I encountered an issue: the application failed to restrict access to certain endpoints based…
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Mapping JSON to Java Classes with Quarkus and Apache Camel
Decoding Complex JSON Structures in Java with Apache Camel and Quarkus Recently, I embarked on a challenging task while working on a project that involved consuming a microservice using Apache Camel and Quarkus. The microservice returned a rather complex JSON structure, which I needed to parse and manipulate within my Java application. The complexity arose…
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Understanding the Difference Between .floor() and .lower() Methods of TreeSet in Java
Exploring TreeSet in Java: .floor() vs. .lower() As a Java enthusiast exploring different components of the Java Collections Framework, I recently delved into understanding the nuances of TreeSet. The operation of TreeSet intrigued me mainly due to its ordered nature of storing elements, which is particularly beneficial when dealing with sorted data. Two methods that…
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Troubleshooting NullPointerException in Android: setText() on a Null TextView
Debugging the NullPointerException in an Android Chat App Let’s dive into an issue I encountered while working on my chat application in Android Studio, using Firebase as the backend. The crux of the problem was trying to differentiate message senders and receivers in the chat, which is a common requirement for any messaging app. The…
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Troubleshooting CDP Version Compatibility in Java Selenium
Troubleshooting Selenium WebDriver Issues with Latest Chrome Version Recently, I upgraded my Chrome browser to version 124.0.6367.119 in hopes of taking advantage of the latest features and performance improvements. However, this upgrade came with its own set of challenges while working with Selenium WebDriver. Initially, I found myself facing an error message during my Selenium…
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Checking Map’s Generic Types in Java: A Quick Guide
Exploring the Generic Types of Java Maps In Java, dealing with collections such as Map often leads to scenarios where understanding the specific generic types at runtime can be critical, especially when dealing with nested collections. Today, I’d like to delve into a common question that arises: how do you check the generic types of…