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Technical Articles

Java

javaTutorial

What is the synchronized keyword in Java?

synchronized is a keyword used in Java to achieve thread safety. It ensures that only one thread can execute synchronous methods or code blocks at the same time through the locking mechanism. 1. For instance methods, the thread must acquire the lock of the object; 2. For static methods, the thread must acquire the lock of the class; 3. Synchronized code blocks allow finer granular control and can specify the lock object; 4. Synchronized can prevent race conditions and memory consistency errors, but excessive use may lead to performance overhead or deadlock. Therefore, synchronized is an effective way to ensure thread safety when modifying shared data.

Aug 17, 2025 am 02:52 AM

Grade points based on letter grade: Java Tutorial

This tutorial is intended to guide readers how to write programs in Java, calculate and output corresponding grade points based on the letter levels entered by the user. The program will convert letter levels to grade points through the qualityPoint method and use the try-catch block to process invalid inputs to ensure the robustness of the program. By studying this tutorial, you will master how to handle user input, make conditional judgments, and handle exceptions.

Aug 17, 2025 am 01:12 AM

How to deploy a Java application

PrepareyourapplicationbyusingMavenorGradletobuildaJARorWARfile,externalizingconfiguration.2.Chooseadeploymentenvironment:runonbaremetal/VMwithjava-jarandsystemd,deployWARonTomcat,containerizewithDocker,orusecloudplatformslikeHeroku.3.Optionally,setup

Aug 17, 2025 am 12:56 AM

java deploy

What is the assert keyword in Java?

TheassertkeywordinJavaisusedtovalidateassumptionsduringdevelopment,throwinganAssertionErroriftheconditionisfalse.2.Ithastwoforms:assertcondition;andassertcondition:message;withthelatterprovidingacustomerrormessage.3.Assertionsaredisabledbydefaultandm

Aug 17, 2025 am 12:52 AM

java assert

What is JRE in Java?

TheJREisrequiredtorunJavaapplicationsandincludestheJVM,corelibraries,andsupportingfilesneededforexecution.ItenablesbytecodeinterpretationthroughtheJVM,allowingJava’s“writeonce,runanywhere”functionality,butdoesnotincludedevelopmenttools.Usersmustinsta

Aug 17, 2025 am 12:19 AM

Tutorial for converting Android views into images and sharing

This tutorial is designed to guide Android developers to convert any view in the application into an image and provides a way to share the image through apps such as WhatsApp, Skype, and Mail. The tutorial covers Android 6 to Android 10 devices, focusing on how to convert views to Bitmap using DrawingCache, and how to save Bitmap to a file system and share it with ACTION_SEND Intent. At the same time, the tutorial also includes necessary permission declarations and precautions to ensure compatibility and correctness on different Android versions.

Aug 16, 2025 pm 02:48 PM

Building a doctor-patient relationship management system in Spring Boot: Entity design and security implementation

This article explores best practices for building a doctor-patient relationship management system in Spring Boot applications, focusing on solving the challenges of entity modeling of user roles (doctors, patients) and Spring Security integration. By introducing a hybrid design scheme that combines common user entities with role-specific entities, we can efficiently manage user basic information, specific role attributes and their complex many-to-many relationships, and lay a solid foundation for flexible permission control.

Aug 16, 2025 pm 02:33 PM

Efficiently manage large-scale Linux command execution in Java applications

Concurrent execution of thousands or even tens of thousands of Linux commands in Java applications is a complex challenge, especially when it is necessary to process output in real time. This article will explore how to efficiently manage and run commands such as socat through Java's ProcessBuilder mechanism, combining asynchronous processing and resource optimization strategies, so as to avoid system load soaring and achieve large-scale concurrent operations. The core lies in understanding command characteristics, optimizing I/O stream processing, and rationally utilizing thread pools.

Aug 16, 2025 pm 02:30 PM

SLF4J Provider Not Found in Integration Test: Solutions and Configuration Guide

This article aims to solve the problem that SLF4J cannot find a provider in an integrated test environment when building a project using Spring Boot and Gradle. We will analyze the cause of the problem, provide solutions, and use configuration examples to help readers avoid similar problems, ensuring that the integration tests can output logs normally.

Aug 16, 2025 pm 02:18 PM

Strategy for security update final ConcurrentHashMap in Java

This article discusses how to safely and atomically update a final modified ConcurrentHashMap in Java high concurrency environment to avoid data inconsistency or transient data loss. The article analyzes the risks of directly clearing and adding, and proposes two main strategies: one is incremental update and deleting old bonds, but they have non-atomic problems; the other is a more recommended atomic replacement solution based on immutable mapping and AtomicReference, which can effectively ensure strong consistency of read operations. At the same time, the article also discusses other advanced strategies and implementation considerations.

Aug 16, 2025 pm 02:09 PM

Generation and verification of PBKDF2 password hash in Java

This article explains in detail the process of using the PBKDF2 algorithm to generate and verify password hashing in Java. First, PBKDF2 is introduced as a secure password hashing algorithm, and the importance of salt value (salt) in increasing hashing security is emphasized. Then, a Java code example is provided to generate a password hash and highlights how to implement password verification by rehashing the user's entered password and comparing it with the stored hash value instead of trying to reverse decryption. The article also contains key security considerations and best practices to ensure a robust password management mechanism.

Aug 16, 2025 pm 02:06 PM

Spring Boot Healthcare System Entity Relationship and Security Implementation Guide

This article aims to explore best practices for building a doctor-patient relationship management system in Spring Boot application. We will dig into how to design flexible and scalable solid models to effectively handle many-to-many associations between doctors, patients, and medications. At the same time, the article will explain in detail how to combine the Spring Security framework to achieve security authentication and refined permission control for different user roles (such as doctors and patients) to ensure the robustness of the system and data security.

Aug 16, 2025 pm 01:57 PM

Micronaut @Error Problem troubleshooting and solutions for not taking effect of annotation

This article provides detailed troubleshooting steps and solutions for the ineffective problems that may be encountered when using the @Error annotation in the Micronaut framework for global exception handling. By analyzing common causes of errors and combining actual code examples, we help developers correctly configure and use @Error annotations to implement a unified exception handling mechanism and improve the robustness and maintainability of the application.

Aug 16, 2025 pm 01:54 PM

The correct way to find the first non-repeat character in a string

This article aims to help developers solve problems when finding the first non-repeating character in a string. By analyzing common errors, we provide optimized code examples and explain in detail how to use the String.valueOf() method to correctly return characters, avoiding returning the entire input string. Mastering these techniques allows you to write more efficient and accurate string processing code.

Aug 16, 2025 pm 01:48 PM