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Technical Articles

Java

javaTutorial

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

Advanced Hibernate Performance Tuning for Java

1. To solve the N 1 query problem, you need to use JOINFETCH, @BatchSize or @EntityGraph to optimize the acquisition strategy; 2. Enable the secondary cache and query cache and reasonably configure the cache area and expired policies; 3. Use StatelessSession to process batch operations, control the transaction scope, and regularly flush and clear sessions to avoid memory overflow; 4. Use @DynamicUpdate, delay loading of large fields, and avoid EAGER's @OneToMany and other mapping optimization to reduce database overhead; 5. Enable Hibernate statistics, integrate monitoring tools and analyze the continuous observation performance of SQL execution plans, and finally adjust based on actual data rather than assumptions.

Sep 01, 2025 am 07:48 AM

java

What is a JAR file in Java?

AJARfileinJavastandsforJavaArchive,whichisapackagedfileformatusedtoaggregatemultipleJavaclassfiles,metadata,andresourcesliketextorimagesintoasinglecompressedfileforeasydistributionanddeployment.ItisessentiallyaZIP-formatfiletailoredforJava,enablingef

Sep 01, 2025 am 07:19 AM

java jar file

Java programming: Calculate the percentage of vocabulary attributes of user input strings

This tutorial details how to receive user input strings in Java and use regular expressions to calculate the percentage of strings that match specific vocabulary attributes (such as pure letter words, initial capital words). The article covers input validation, data storage, regular expression matching, and modular counting methods, aiming to provide a clear and efficient solution.

Sep 01, 2025 am 07:06 AM

Format datetime using Jackson's @JsonFormat annotation

This article introduces how to use the @JsonFormat annotation of the Jackson library to format the date and time fields in Java objects to solve the problem that the @DateTimeFormat annotation in the Gson library does not take effect. By using @JsonFormat, you can precisely control the format of date and time fields during serialization and deserialization, ensuring data consistency and readability.

Sep 01, 2025 am 06:42 AM

Passing variables across scenes in Cucumber: A feasible but not recommended approach

This article explores technical approaches to pass variables across different scenarios in Cucumber testing, and although technically feasible, it is highly recommended to avoid this practice from a test design perspective. The article will introduce the use of global variables and Cucumber's Background keyword to achieve cross-scene variable sharing, and emphasize the importance of independent scenarios.

Sep 01, 2025 am 06:18 AM

How to calculate the sum of infinite interlaced series using Java: Taylor Series Approximation Tutorial

This tutorial explains in detail how to calculate the sum of infinite interleaved series S = -(2x)^2/2! (2x)^4/4! - (2x)^6/6! ... within a specified interval. The content covers Taylor expansion of the series as cos(2x) - 1, analyzes common implementation errors, and provides an efficient and accurate Java iterative computing scheme, focusing on best practices for precision control and loop termination.

Sep 01, 2025 am 06:06 AM

What are wrapper classes and why are they used in Java?

Wrapperclassesareusedtoconvertprimitivedatatypesintoobjects,enablingtheiruseincollections,allowingnullvalues,providingutilitymethods,andsupportingautoboxing/unboxing.1.TheyallowprimitivestobeusedincollectionslikeArrayList,whichonlyacceptobjects.2.The

Sep 01, 2025 am 05:58 AM

java Packaging

How to integrate Java 19's preview features and incubator modules in Gradle projects

This tutorial details how to configure and use Java 19 preview features (such as virtual threads) and incubator modules (such as structured concurrency) in a Gradle project. By modifying the build.gradle file, you can enable the necessary JVM parameters for the compile and runtime environment, taking advantage of the latest experimental features of the Java platform.

Sep 01, 2025 am 05:48 AM