成人毛片100免费观看,chinese老熟妇老女人hd

Article Tags

All
web3.0
- All
Backend Development
Web Front-end
Database
- All
- Mysql Tutorial
- navicat
- SQL
- Redis
- phpMyAdmin
- Oracle
- MongoDB
Operation and Maintenance
- All
- Mac OS
- Linux Operation and Maintenance
- Apache
- Nginx
- CentOS
- Docker
Development Tools
- All
- VSCode
- sublime
- notepad
- git
- composer
PHP Framework
- All
- Laravel
- YII
Common Problem
- All
Other
- All
- IIS
- SEO
- Premiere
Tech
- All
- AI
- It Industry
CMS Tutorial
- All
- WordPress
Java
- All
- javaTutorial
System Tutorial
- All
- Windows Series
- LINUX
- MAC
Computer Tutorials
Hardware Tutorial
Mobile Tutorial
- All
- Mobile News
- iPhone
- Android Phone
Software Tutorial
Mobile Game Tutorial

Home

Technical Articles

Java

javaTutorial

Developing Real-Time Applications with Java and WebSockets

JavawithWebSocketsisidealforreal-timeapplicationslikechatappsandlivedashboardsduetoitsfull-duplex,low-latencycommunication;1.UseSpringBoot’sspring-websocketandspring-messagingtosetupWebSockets;2.ConfigureSTOMPendpointsandmessagebrokersvia@EnableWebSo

Aug 16, 2025 am 11:10 AM

How to validate an email address using regex in Java

First, use a reasonable regular expression pattern to verify the mailbox format, and then implement it in Java through the Pattern class; 1. Define a regular expression containing the complete matching rules of ^ and $ to ensure that the overall string meets the requirements; 2. The regular expression is divided into local parts, @ symbols and domain names. The local part allows letters, numbers and _&*- and supports dot segmentation; 3. The domain name part requires at least one subdomain and ends with a top-level domain of 2 to 7 letters. {2,7} can be adjusted to support longer gTLD; 4. Compile the regular as a Pattern object in Java and reuse it, and determine whether the input string is exactly matched by the matches() method; 5. This method is suitable for form input verification

Aug 16, 2025 am 10:59 AM

How to send and receive messages over a WebSocket in Java

Create a WebSocket server endpoint to define the path using @ServerEndpoint, and handle connections, message reception, closing and errors through @OnOpen, @OnMessage, @OnClose and @OnError; 2. Ensure that javax.websocket-api dependencies are introduced during deployment and automatically registered by the container; 3. The Java client obtains WebSocketContainer through the ContainerProvider, calls connectToServer to connect to the server, and receives messages using @ClientEndpoint annotation class; 4. Use the Session getBasicRe

Aug 16, 2025 am 10:36 AM

java

How to tune garbage collection in Java?

TooptimizeJavaapplicationperformance,tunegarbagecollectionbyfirstunderstandingyourapp'smemoryallocationrate,objectlifetime,andlatencyorthroughputneeds,thenchooseanappropriategarbagecollector:useG1GCforbalancedperformance,ZGCorShenandoahforlow-latency

Aug 16, 2025 am 10:34 AM

How to reduce a collection in Java

Use reduce(identity, accumulator) to perform safe sequential specifications on the set and always return the value; 2. When no initial value is provided, reduce() returns Optional, and the empty set needs to be handled; 3. When custom object configurations, it can be combined with built-in methods such as mapToInt().sum() to be clearer; 4. Use three parameters reduce(identity, accumulator, combiner) in parallel streams to merge thread results, which ensures that the function is stateless and meets the binding law; special methods such as sum() and max() should be used to improve readability and performance.

Aug 16, 2025 am 10:25 AM

JDK version conflict in Bazel Java project: Compilation and Runtime Environment Configuration Guide

This article aims to resolve common java.lang.UnsupportedClassVersionError errors in Bazel Java projects. This error usually originates from the mismatch between the JDK version used by Java compile-time and runtime. The article will elaborate on the role of the two key flags --java_language_version and --java_runtime_version in Bazel, and provide correct configuration methods to ensure consistency between the compilation and execution environment, thereby avoiding version incompatibility issues.

Aug 16, 2025 am 09:45 AM

The trap of Java method return value: Solve the problem of redundant output when finding the first non-repetitive character

This article aims to solve the problem of redundant output caused by improper printing and return logic when searching for the first non-repeat character of a string in Java methods. By analyzing the execution flow of the original code, the independent role of System.out.println and return statements are revealed, and a solution to convert characters into strings and return immediately using String.valueOf(). The article also explores more robust method design, including return type selection and processing of resultless cases to ensure code clarity and professionalism.

Aug 16, 2025 am 09:27 AM

Jackson JSON attribute serialization detailed explanation: annotations, rules and best practices

This article deeply analyzes the mechanism of serializing JSON attribute names in the Jackson library. By analyzing how Jackson uses JavaBeans convention and annotations such as @JsonAlias, @JsonGetter, @JsonProperty, the process of serialization and deserialization is clarified. At the same time, it provides best practices to help developers avoid common configuration errors and write more concise and efficient serialized code.

Aug 16, 2025 am 09:09 AM

How to use the this keyword in Java

Usethistoresolvenamingconflictsbetweeninstancevariablesandparameters;2.Usethis()forconstructorchaining,ensuringitisthefirststatement;3.Passthistomethodsorconstructorstoprovidethecurrentobject;4.Returnthistoenablemethodchaining;5.Optionallyusethistoca

Aug 16, 2025 am 09:02 AM

Research on the reflection modification method of final field in Java 17

This article discusses how to modify the value of a non-static final field through reflection techniques in Java 17 and later. In response to the problem of the failure of old reflection methods after Java 12, the article details the use of the VarHandle API combined with specific JVM startup parameters (--add-opens) to achieve this operation. At the same time, the potential risks and best practice suggestions of this operation are emphasized, and developers are reminded to use it with caution.

Aug 16, 2025 am 08:51 AM

Use Selenium and Java to implement page scrolling loading until the specified number of elements are loaded

This article aims to describe how to write automated test scripts using Selenium and Java to achieve page scrolling until the number of elements loaded on the page reaches the preset goal. By scrolling the bottom of the page and counting the number of elements, you can effectively process unlimited scrolling or lazy loading web pages, ensuring that the test can cover enough data.

Aug 16, 2025 am 08:39 AM

Java abstract class instance method call: Solve the problem of accessing non-static methods from static context

This article aims to resolve compilation errors encountered when trying to directly call non-static (instance) methods in abstract classes from static contexts. The core is to understand that instance methods must be called through the instance objects of the concrete class, rather than directly through the class name. The tutorial will elaborate on how to correctly access and execute abstract methods of their implementation by instantiating concrete subclasses of abstract classes, and provide sample code to ensure that object-oriented design principles are followed.

Aug 16, 2025 am 08:00 AM

Reading a list of JSON objects from AWS S3 using Spring Boot

This document is intended to guide developers how to use Spring Boot and AWS SDK to read text files containing multiple JSON objects from an S3 bucket and convert them into a list of Java objects. The article will provide two implementation methods, one is to read the S3 file to the local file system, and the other is to process the data directly in memory, and provide detailed code examples and configuration instructions.

Aug 16, 2025 am 07:54 AM

What's New in Java 21: A Developer's Guide

Java21,releasedinSeptember2023,isalong-termsupport(LTS)versionthatintroducesmajorimprovementsforperformance,concurrency,anddeveloperproductivity.1.VirtualThreadsarenowfinal,enablinghigh-throughput,I/O-heavyapplicationsbyallowingmillionsoflightweightt

Aug 16, 2025 am 07:49 AM

new features Java 21