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Technical Articles

Java

javaTutorial

How to get the operating system name in Java?

To get the operating system name in Java, you should use System.getProperty("os.name"); 1. Get the operating system name through StringosName=System.getProperty("os.name"); 2. Use System.getProperty("os.version"); 3. Use System.getProperty("os.arch") to obtain the system architecture; 4. It is recommended to convert the result to lowercase and make inclusion judgments to achieve cross-platform

Sep 09, 2025 am 02:09 AM

What is the jstack command in Java?

jstackprintsJavastacktracesofthreadsforagivenJavaprocesstodiagnoseissueslikedeadlocks,highCPUusage,orapplicationhangsbyshowingthreadstates,stackframes,andlockinformation,helpingdevelopersanalyzethreadbehaviorinrunningapplications.

Sep 09, 2025 am 12:43 AM

Inject named values ??in GWT client using Guice

This article describes the problems encountered when injecting named values ??using Guice in GWT client code and provides solutions. Since the GWT client does not support the full Guice function, it is impossible to directly use the @Named annotation to perform dependency injection on the client. This article will explain how to bind static values ??on the client side through AbstractGinModule, and how to get dynamic values ??on the server side through GWT RPC and use them on the client side.

Sep 08, 2025 pm 12:51 PM

Implementing a CSV to object converter using Java generics

This article will explain how to use Java generics to create a general CSV to object converter. With generics, we can avoid writing duplicate code for each Java class that needs to be converted, thereby improving the reusability and maintainability of the code. The article will provide code examples and discuss some suggestions on code design and existing CSV parsing libraries.

Sep 08, 2025 pm 12:27 PM

Java GUI: Use check boxes and images to implement logic gates

This article will guide you how to use Java Swing to create a simple GUI program that simulates an AND logic gate. Two check boxes represent input, and a label displays an image (simplified here to the text "green" or "red") represents output. When both check boxes are selected, the output displays "green" or "red" otherwise. The article will provide complete code examples and explain key steps to help you understand event handling and the use of GUI components.

Sep 08, 2025 pm 12:12 PM

Solution that file upload test passed locally but failed on Jenkins

This article aims to resolve the issue where file upload tests run properly in the local development environment but fail in the Jenkins CI/CD environment. By analyzing Jenkins' working directory structure, a solution is provided to enable tests to pass on Jenkins without modifying the code, and remind developers to pay attention to file names in the error message to avoid finding solutions in the wrong places.

Sep 08, 2025 pm 12:06 PM

The correct way to process currency data in Java

This article explores the importance of choosing the right data type when processing currency data in Java. In response to the problem of reading data containing currency formats such as comma and dollar signs from JSON and mapping them to DTO classes, the article analyzes the applicability of data types such as String, Long, and BigDecimal, and emphasizes the risk of accuracy loss. Ultimately, BigDecimal is recommended for currency calculations to ensure accuracy.

Sep 08, 2025 am 11:48 AM

Java datetime processing: How to generate independent timestamps for each user input

This tutorial explores in depth how to dynamically generate and print independent date and timestamps for each user input in Java applications. The article first explains the common mistakes made by the old java.util.Date API when getting the latest timestamps in a loop, and shows the correct implementation through code examples. Then, best practices for using modern java.time APIs such as LocalDateTime and DateTimeFormatter to handle dates and time are highlighted, emphasizing its superiority in design and functionality, helping developers write more robust and precise time processing logic.

Sep 08, 2025 am 11:45 AM

Java collection reference management: a policy to ensure independent internal list status when object creation

This tutorial explores how to avoid unexpected changes to internal data caused by reference sharing when passing sets as parameters to constructors in Java. When multiple objects share the same mutable collection instance and modify the collection externally, all objects referencing the collection are affected. The article will detail two effective strategies: creating new collection instances or performing defensive replication, ensuring that each object has an independent and stable internal data state.

Sep 08, 2025 am 11:33 AM

Handling null values ??and throwing exceptions in responsive programming: Spring WebFlux practice

This article aims to explain how to gracefully handle possible null values ??and throw custom exceptions under specific conditions in Spring WebFlux responsive programming. Focus on the usage of flatMap and handle operators, and provide sample code to help developers avoid potential problems caused by null values ??and improve the robustness and maintainability of their code.

Sep 08, 2025 am 11:06 AM

Tutorial on Docker deployment of Quarkus app on Render.com

This article aims to guide developers on how to deploy Quarkus applications on the Render.com platform. In response to the problem that Quarkus' default Dockerfile cannot be directly built in Render, the tutorial explains in detail how to complete application compilation within the container by adopting a multi-stage Docker construction strategy and optimize the .dockerignore configuration. Through this tutorial, you will master the complete process of efficiently and stably deploying Quarkus applications on Render.

Sep 08, 2025 am 10:51 AM

Improper use of Future objects in concurrent programming and solutions

This article analyzes the reasons for the common set is not applicable to arguments (int,int) errors in Java concurrent programming, which are trying to directly assign integer values ??to the sets storing Future objects. The article will elaborate on the characteristics of Future objects and provide the correct solution, including how to initialize data, avoid concurrency problems, and use ExecutorService rationally.

Sep 08, 2025 am 10:48 AM

Initialize members of another class in one class using a method with arguments

This article describes how to initialize member variables of another class in Java by using parameters in a class method. The focus is on understanding the concepts of object instantiation and reference passing, avoiding null pointer exceptions, and providing two different implementation methods, one is to create a new object inside the method, and the other is to pass the object as a parameter.

Sep 08, 2025 am 10:30 AM

Spring Boot Thymeleaf Dynamic Table Rendering and Operation Button Integration Tutorial

This tutorial aims to solve the problem of how to correctly add action buttons (such as delete buttons) to each row of data when rendering dynamic tables using the Thymeleaf template engine in Spring Boot application. We will build a complete example of data model, backend controller and frontend templates to explain in detail how to avoid common loop nesting errors and ensure that each record corresponds to an operation button, thereby achieving clear and fully functional data display and interaction.

Sep 08, 2025 am 10:27 AM