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Technical Articles

Java

javaTutorial

Accurately identify Apple Silicon and Intel processor architecture in Java

This article discusses the method to accurately distinguish whether the underlying operating system is an Apple Silicon or an Intel processor architecture in Java. Since System.getProperty("os.arch") only reflects the JRE architecture rather than the physical CPU, it needs to be implemented by calling operating system native commands or environment variables. The tutorial will introduce detailed implementation steps and sample code on Windows and macOS platforms to help developers execute specific logic on different processor architectures.

Sep 01, 2025 am 11:09 AM

Convert an array of Java objects in a nested loop to a HashMap to optimize performance

This article aims to guide developers how to optimize the performance of Java code by converting nested loops to HashMap, especially when the loop involves equality checks for object properties. By leveraging the fast search feature of HashMap, time complexity can be significantly reduced and code execution efficiency can be improved. This article will provide detailed steps and sample code to help you understand and apply this optimization technique.

Sep 01, 2025 am 11:03 AM

Problems and solutions to obtain JSP Session attribute as NULL

This article aims to resolve the issue where getAttribute() returns NULL when sharing JSP Session data between different browser windows or tabs. The article will explore the scope concept in JSP in depth and provide effective ways to share data between different sessions using application scope. It also provides code examples and considerations to help developers better understand and apply.

Sep 01, 2025 am 10:54 AM

JPype Integration Aspose.Cells: Guide to Solving Java Heap Memory Overflow Errors

When a Python program calls Java libraries (such as Aspose.Cells) to process large files through JPype, it may encounter java.lang.OutOfMemoryError: Java heap space. This article will provide detailed guidance on how to effectively solve this problem by configuring the maximum heap memory parameters of the JVM in jpype.startJVM() to ensure that Python programs can perform memory-intensive Java operations stably.

Sep 01, 2025 am 10:39 AM

Kotlin Advanced Tutorial: Find the intersection of two sorted bidirectional looped lists and delete elements

This tutorial aims to solve the problem of finding the intersection of two sorted two-way circular linked lists in Kotlin and deleting the intersection elements from the original linked list at the same time. We will provide a clear implementation solution that efficiently utilizes the features of linked lists, avoids unnecessary space overhead, and ensures that the final result list is ring-free and sorted.

Sep 01, 2025 am 10:36 AM

Tutorial on the optimization of infinite series summation and Java implementation

This tutorial explores in detail how to accurately calculate the sum of infinite series of forms such as S = -(2x)^2/2! (2x)^4/4! - (2x)^6/6! ... within the specified interval [0.1, 1.5]. The article first analyzes the mathematical equivalence of this series with cos(2x) - 1, and then deeply analyzes common errors in existing Java code, including item initialization, iterative update logic and loop termination conditions. Finally, optimization algorithms and Java implementations based on iterative computing and precision control are provided, aiming to help readers master efficient and accurate series summing methods.

Sep 01, 2025 am 10:33 AM

How to implement the Add Favorites button and add a card to a separate Favorites page

This article describes how to implement a simple collection function using JavaScript and localStorage. Users can click the "Add" button on the main page to add cards to the collection list and view favorite cards on a separate collection page. This article will provide detailed code examples and step instructions to help you implement this feature quickly.

Sep 01, 2025 am 10:30 AM

Tutorial on setting and dynamic acquisition of locale in Android applications

This tutorial details how to set up a locale in an Android application and how to get the currently in effect language values ??at runtime so that specific business logic can be performed according to different languages, such as dynamically selecting data tables. The article provides examples of code for obtaining locale environments and emphasizes considerations and best practices when using language code to make conditional judgments.

Sep 01, 2025 am 10:24 AM

Detailed explanation of the differences between Math.pow() and multiplication operation results and operator priority in Java

This article aims to explain the possible differences between the Math.pow() function and direct multiplication operation in Java, and to deeply analyze the priority rules of Java operators. With specific examples, explain how operator priority affects the results of the calculation and provide suggestions to avoid potential errors, helping developers write more accurate and reliable Java code.

Sep 01, 2025 am 10:15 AM

ZK Combobox: Keep the drop-down box open after clicking a specific option

This document is intended to provide a solution to the need to keep the drop-down box open after clicking a specific option (such as "Show More") when using the Combobox component of the ZK Framework. By default, Combobox will automatically close after the option is clicked. This article will implement the required functionality by overwriting the doClick_() method of its JavaScript component, and provide detailed code examples and step descriptions.

Sep 01, 2025 am 10:06 AM

Java concurrent programming: mastering Future, thread safety and atomic operations

This tutorial explores in-depth how to avoid using Future objects incorrectly used to store variable data in Java concurrency programming, and provides detailed guidance on how to correctly manage the ExecutorService lifecycle and use concurrent tools such as AtomicIntegerArray to achieve thread-safe updates of shared array elements to ensure data consistency.

Sep 01, 2025 am 10:03 AM

Solution to abnormal behavior of carriage return character in Eclipse IDE

This article explores the issue where the carriage return \r fails to overwrite the current row as expected but instead produces a new row when using System.out.print("\r") in the Eclipse IDE. The core solution is to adjust Eclipse console preferences and enable the "Explanation Carriage Return as Control Character" option to ensure that \r correctly performs the cursor return function and achieves single-line progress updates.

Sep 01, 2025 am 09:27 AM

Handling full permutations in Java: Simulating the correct posture of hiring problems and probability calculations

This article delves into how to correctly generate and process all permutations of arrays one by one in Java to solve a classic mock hiring problem and calculate the probability of a specific event (such as hiring exactly twice). The article analyzes common errors in the original code for flattening arrangements, and provides a correct solution based on List structure, traversing and applying business logic one by one, ensuring the accuracy of probability calculations.

Sep 01, 2025 am 09:06 AM

Convert JSON to custom classes using GSON and Kotlin generics

This document aims to solve the ClassCastException issue encountered when converting JSON data to custom classes when deserializing JSON with GSON and Kotlin generics. By analyzing the cause of the problem, providing solutions, and introducing improvements to such problems in future GSON versions, helping developers better understand and use GSON for Kotlin development.

Sep 01, 2025 am 09:00 AM