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Technical Articles

Java

javaTutorial

Use Java regular expressions and Stream API to numerically sort words in strings

This article details how to use the Java language, combining regular expressions (Lookaround) and Stream API to sort strings containing numbers. By associating words with corresponding numbers and storing them using Map, we finally realize the reorganization of strings in numerical order to solve the problem of out-of-order strings.

Aug 29, 2025 am 11:21 AM

The correct way to call Servlet after front-end verification

This article aims to solve the problem of how to correctly call Servlets after front-end JavaScript verification. By analyzing common error causes, such as blocking of form submission events and page overloading, and the use of HTTP methods in Servlets, a clear solution is provided to ensure that after front-end verification is passed, a request can be sent to the Servlet and processed user login.

Aug 29, 2025 am 11:18 AM

Java Selection Sort: Visualize the array state of each step

This tutorial aims to dig into the selection sorting algorithm and highlights how to display the state of an array after each iteration in real time during the sorting process. By modifying the core sorting method and integrating the array state printing function, developers can clearly observe the execution details of the algorithm, which is of great significance to understanding the working principle of selecting sorting, debugging code, and teaching demonstration.

Aug 29, 2025 am 11:09 AM

RESTful API design principles: Why should not maintain state across calls on the server side

In a RESTful API design, attempting to save variable states (such as user lists) across different API calls in server memory is a violation of the REST core stateless principle. The RESTful service should treat each request as independent, and its state should be managed through an external persistence mechanism (such as a database) rather than maintained in server-side sessions or in memory to ensure system scalability, reliability and consistency.

Aug 29, 2025 am 10:45 AM

Remotely run GUI applications: server-side deployment and client execution

This article aims to solve the problem of how to deploy a GUI application on the server side and enable the client to run the program. The core idea is to package the GUI application into an executable JAR file, the server provides a download link, and execute it locally after the client downloads. The article details the sample code that the client downloads JAR files and runs, and emphasizes the importance of security and dependency management.

Aug 29, 2025 am 10:33 AM

Retrieve JSON object data from JSON Simple library

This article aims to describe how to retrieve data from JSON objects using the JSON Simple library. We will use a simple example to demonstrate how to parse a JSON string containing key-value pairs and extract the value corresponding to a specific key. This article will provide clear code examples and detailed step instructions to help readers quickly grasp the basic usage of the JSON Simple library.

Aug 29, 2025 am 10:18 AM

Initialize and use Kotlin ViewModel (Integrated Hilt) in Java code

This article explains in detail how to effectively initialize and call ViewModel written by Kotlin and integrate Hilt in Java Android project. The core content includes ensuring that Hilt components (such as Activity) correctly annotate @AndroidEntryPoint, and using the ViewModelProvider mechanism to obtain ViewModel instances in Java code and then call their exposed methods, thereby achieving seamless interaction between Kotlin and Java code.

Aug 29, 2025 am 10:12 AM

Java Caesar Password: How to keep spaces in encrypted output

This tutorial aims to solve common space loss problems in Java Caesar password implementation. By analyzing the logic of skipping spaces in existing code, we provide a simple and effective correction: when traversing messages, the space characters are not skipped, but instead add them directly to the encrypted string. This ensures that the encrypted text can retain the structure and readability of the original message, thereby improving the availability of the encryption results.

Aug 29, 2025 am 10:00 AM

Time Zone Processing in Java Mail iCal Meeting Invitations: A Professional Guide to Avoiding Time Offsets

This tutorial explores the common time zone offset issues when Java Mail sends iCal meeting invitations. The core lies in the default interpretation of the iCal DTSTART and DTEND fields for UTC time (ends with 'Z'). The article will elaborate on how to correctly construct local time or time strings with time zone identification using the java.time API to ensure that the meeting invitation is displayed accurately on the receiving client.

Aug 29, 2025 am 09:54 AM

Android RecyclerView optimization: Incremental updates through DiffUtil

This tutorial aims to solve the full refresh and flickering problems of RecyclerView when data is updated (especially new data). By introducing the Android DiffUtil mechanism in detail, we will learn how to efficiently update the list items, thereby improving the user experience and avoiding unnecessary UI redrawing, which is especially suitable for scenarios where frequent data changes such as live chat.

Aug 29, 2025 am 09:48 AM

Tutorial for aligning SLF4J log output

This article aims to help developers to achieve the alignment of log output by configuring an underlying log framework (such as Logback) when using SLF4J (Simple Logging Facade for Java). SLF4J is just a log facade, and the actual log format control is accomplished by its underlying log implementation. This article will focus on how to use Logback's formatting options, including padding and minimum/maximum width settings, to achieve aligned display of log information, thereby improving log readability.

Aug 29, 2025 am 09:33 AM

Spring REST API: Resolving ambiguity in AntPathMatcher

This article aims to resolve routing ambiguity issues when using AntPathMatcher in the Spring REST API. By analyzing the problem scenario, the use of @PathVariable annotation to accurately match and extract variables in the URL, thereby avoiding conflicts between different routing patterns and ensuring that requests can be mapped to the corresponding processing methods correctly.

Aug 29, 2025 am 09:24 AM

Apache CXF Compatibility Solution for Sending Byte Arrays in OpenLiberty Environment

This article discusses the compatibility issues encountered when using Apache CXF to send byte arrays as REST request bodies in OpenLiberty environment. After migrating from JBoss/RestEasy, the original direct sending method of byte array is invalid. The core reason is the incompatibility of the Chunked Transfer Encoding enabled by Apache CXF with the target service. The tutorial will elaborate on this issue and provide a professional way to address chunked transfer compatibility by tuning the server configuration, ensuring that byte arrays can be transferred as expected.

Aug 29, 2025 am 09:21 AM

Detailed explanation of the method of converting the current time into seconds in Java

This article details several ways to convert the current time into seconds calculated from the day in Java. It focuses on how to use the java.time.LocalTime class to get the number of seconds of the current time, and provides a method to compare the current time with the target time. At the same time, the impact of time zones and how to avoid the problems caused by the system's default time zones are also discussed, and a more readable way to define target time is given.

Aug 29, 2025 am 09:12 AM