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Technical Articles

Java

javaTutorial

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

Remove punctuation marks from Java text files

This article describes how to use Java to read content from a text file and remove all punctuation marks from it. By using regular expressions, the removal of punctuation marks can be achieved concisely and efficiently. This article provides a complete sample code showing how to read a file, remove punctuation, and output processed text to the console. At the same time, a brief description of the usage of regular expressions is also provided to facilitate readers' understanding and application.

Sep 01, 2025 am 08:57 AM

What is the Stream API in Java?

TheStreamAPIinJavaisafunctionaltoolforprocessingsequencesofelementsfromsourceslikecollectionsorarrayswithoutstoringormodifyingtheoriginaldata,supportingoperationssuchasfilter,map,andreduceinadeclarativeway,withintermediateoperationslikefilterandmapbe

Sep 01, 2025 am 08:51 AM

java

How to Structure a Scalable Java Monolith

Usefeature-basedpackagingandtoolslikeArchUnittoenforcemoduleboundaries.2.Decouplemoduleswithdomaineventsandsharedcontractsinsteadofdirectcalls.3.Optimizeperformanceviastatelessservices,caching,databasetuning,andasyncprocessing.4.Structurebuildswithmo

Sep 01, 2025 am 08:42 AM

java Architecture

In-depth understanding of Logback addition: Programming practices for disabling console default output

This article explores in-depth common problems when Logback is still output to the console when the ConsoleAppender is not explicitly configured. The core lies in the additionity (accumulative) characteristics of Logback. By programming the logger.setAdditive(false), log events can be effectively prevented from being passed to the upper logger and triggered its associated Appender (including Logback's default console output), thereby achieving precise control of the output target of the log.

Sep 01, 2025 am 08:33 AM

What is a CompletableFuture in Java?

ACompletableFutureinJavaisaclassthatrepresentsafutureresultofanasynchronouscomputationandprovidesapowerfulwaytohandle,chain,andcombinenon-blockingoperationswithbuilt-inerrorhandling;introducedinJava8,itenhancesthebasicFutureinterfacebyallowingcomposi

Sep 01, 2025 am 08:24 AM

SpringBoot Thymeleaf: The correct implementation of table data loops and operation buttons

This tutorial explains in detail how to correctly display data in HTML tables using Thymeleaf in Spring Boot applications and add an independent action button (such as deletion) to each row of data to avoid duplicate rendering problems caused by improper loop nesting. By building a unified data model and optimizing the Thymeleaf loop structure, ensure that each record has clear data display and corresponding operation functions.

Sep 01, 2025 am 08:21 AM

The correct way to call Servlet after verification with JavaScript

This document is intended to guide developers how to correctly call Servlets to process form data after JavaScript validates client input. We will focus on how to avoid common HTTP 405 errors and provide clear code examples and best practices to ensure data is safe and reliable to be transferred to the server.

Sep 01, 2025 am 08:09 AM

How to use the clone method in Java

To correctly use the clone() method in Java, you must implement the Cloneable interface and override the clone() method; 1. Implement the Cloneable interface to allow cloning; 2. Rewrite the clone() method and declare it public; 3. Call super.clone() in the method to perform actual copy; the default is a shallow copy, if you need a deep copy, you need to clone the reference object manually; if you do not implement Cloneable, CloneNotSupportedException will be thrown; it is recommended to consider clearer alternatives such as copy constructors, but if you use clone(), exceptions must be handled and configured correctly.

Sep 01, 2025 am 08:04 AM

Master the correct use of query parameters and request headers in HTTP requests

This article aims to clarify the core differences between query parameters and request headers in HTTP GET requests and the correct usage method. By analyzing a common error example, we will explain in detail how to correctly attach query parameters (such as city information) to the URI and how to place request headers (such as API keys) in the HTTP request header section to help developers build HTTP specification-compliant, fully functional web service requests.

Sep 01, 2025 am 07:57 AM

Implement CSV to object conversion using Java generics

This article describes how to use Java generics to create a common CSV file converter that dynamically converts data in CSV files into different types of Java objects, such as Cat and Dog. By using generics, writing duplicate code for each object type is avoided, improving the reusability and maintainability of the code. At the same time, it is recommended to use the existing CSV parsing library to simplify development and improve code robustness.

Sep 01, 2025 am 07:48 AM