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Technical Articles

Java

javaTutorial

what is the try-with-resources statement in java

Use the try-with-resources statement to automatically close the resources that implement the AutoCloseable interface to avoid resource leakage; it declares the resources in brackets after the try, ensuring that the resources will be automatically closed regardless of whether an exception occurs, thus replacing the traditional way of manually closing resources in finally blocks; this mechanism supports multiple resource management, and can still correctly close the resources in exceptions, and prioritizes throwing exceptions in the try blocks, and allows suppressed closing exceptions to be obtained through the getSuppressed() method. It is recommended to use this structure when handling resources such as files, database connections, or network flows that need to be explicitly closed, to improve the security and readability of the code.

Sep 02, 2025 am 12:27 AM

Implementation of complex sorting logic in Java: Multi-condition Comparator Design Guide

This article explores in-depth ways to implement complex sorting logic in Java, especially when ordering the object list based on multiple, prioritized conditions such as specific type order and alphabetical order. By introducing two strategies for defining priority and Map-based using enumerations, combined with Comparator chain calls, we aim to provide clear, maintainable and efficient solutions to help developers deal with multi-dimensional sorting challenges.

Sep 01, 2025 am 11:39 AM

Tutorial on Generating Dynamic Character Patterns Based on User Input in Java

This tutorial details how to dynamically generate specific character patterns in Java based on the number of lines entered by the user. By cleverly using nested loops and modulo operators, we can alternately output different characters (such as '' and '-') according to the parity of the number of lines, and ensure that the number of characters per line is consistent with the line number, thereby efficiently realizing the printing of patterns.

Sep 01, 2025 am 11:18 AM

Java Swing implements logic gates with check boxes and images

This article describes how to use Java Swing to create a simple AND logic gate GUI that contains two check boxes and an image. When both check boxes are selected, the image becomes green; otherwise, the image becomes red. We will use JCheckBox, JLabel, and ChangeListener to implement this functionality and provide a complete code example.

Sep 01, 2025 am 11:15 AM

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