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Technical Articles

Java

what is a marker interface in java

AmarkerinterfaceinJavaisanemptyinterfaceusedtomarkaclasswithaspecificcapabilityorbehavior,suchasSerializable,Cloneable,orRemote,allowingtheJVMorframeworkstoperformspecialhandlingviainstanceofchecks,andalthoughlargelyreplacedbyannotationsinmodernJava,

Aug 13, 2025 am 07:13 AM

Java Properties file: Implement searching data through partial key matching

This article aims to solve the common requirement in Java applications to find corresponding values (Values) based on partial keys (Keys) from .properties files. Since the java.util.Properties class requires exact matches of keys by default, direct searching will fail when only part of the key is known. This tutorial will introduce in detail how to use the Properties.stringPropertyNames() method to traverse all keys, combine string matching logic (such as contains()), to efficiently implement fuzzy search of partial keys, and provide sample code and precautions to ensure the flexibility and accuracy of data retrieval.

Aug 13, 2025 am 07:03 AM

Exception handling and data flow selection strategies in Java Socket programming

This article discusses the common exceptions such as SocketException, StreamCorruptedException and ClassCastException in Java Socket programming, especially when using ObjectInputStream/ObjectOutputStream for data transmission. The article analyzes the root causes of these exceptions and emphasizes the unreliability of network communication and the possible challenges brought by object serialization. Tutorials provide targeted solutions, including robust exception handling mechanisms, recommended data serialization formats (such as JSON or Protocol Buffers) that are more suitable for network transmission, and refer to

Aug 13, 2025 am 06:51 AM

Solutions for failing to load SVG images using Glide

This document is intended to resolve the "onLoadFailed" issue encountered when loading SVG images using the Glide library. By introducing the necessary dependencies, replacing Glide with GlideApp, and adjusting the Glide loading configuration, SVG images can be loaded successfully and displayed in ImageView. This document is based on Glide 4.10.0 and above, and provides detailed steps and code examples to help developers quickly solve similar problems.

Aug 13, 2025 am 06:39 AM

Java Swing: Solve the problem that images cannot be displayed on buttons

This article aims to help developers solve the problem that images cannot be displayed correctly on buttons in Java Swing programs. By tweaking the project structure, using the correct way of referenced resource paths, and ensuring correct image loading and scaling, you can easily display images in your Swing application. This article will provide detailed steps and sample code to help you solve problems quickly.

Aug 13, 2025 am 06:21 AM

Advanced Error Handling Strategies in Java

Definecustom,domain-specificexceptionswithaclearhierarchytoenablepreciseerrorhandlingandimprovedebugging;2.Validateinputsatentrypointstofailfast,preventcascadingfailures,andenhanceAPIfeedbackusingJSR-380annotations;3.Usetry-with-resourcesforautomatic

Aug 13, 2025 am 03:07 AM

How to connect to MySQL with JDBC in Java?

AddtheMySQLJDBCdriverviaMavenormanuallytotheclasspath.2.LoadingthedriverusingClass.forNameisoptionalforJDBC4.0andlater.3.EstablishaconnectionusingDriverManager.getConnection()withavalidURL,username,andpassword.4.Handleexceptionswithtry-catchblocksand

Aug 13, 2025 am 02:59 AM

How to use the factory pattern in Java?

To use factory mode, first define a public interface Shape, and then create Circle and Rectangle classes that implement the interface; then create ShapeFactory factory class, which contains the createShape method that returns the specific Shape object according to the input parameters; obtain the object through the factory in the client code instead of directly using new; finally call the method through the unified interface. 1. Define the Shape of the public interface; 2. Implement the Circle and Rectangle classes; 3. Create the ShapeFactory class and implement the createShape method; 4. Create an object using the factory on the client and call the draw method; 5. Optionally use Shape

Aug 13, 2025 am 02:26 AM

How to implement dependency injection in Java with Spring?

SetupaSpringBootprojectusingMavenorGradlewithspring-boot-starter.2.Use@SpringBootApplicationtoenableautomaticcomponentscanning.3.Createbeansusing@Component,@Service,orsimilarannotations.4.Injectdependenciesviaconstructorinjectionforimmutabilityandtes

Aug 13, 2025 am 02:07 AM

java dependency injection

what is the java collections framework

TheJavaCollectionsFrameworkisasetofclassesandinterfacesinthejava.utilpackagethatprovidesefficient,standardizedwaystohandlegroupsofobjects.ItincludescoreinterfacessuchasCollection,List,Set,Queue,Deque,andMap,eachdefiningspecificbehaviorsfordataorganiz

Aug 13, 2025 am 01:34 AM

How to use Mockito for testing in Java

MockitoisapopularmockingframeworkinJavathatsimplifiesunittestingbyallowingyoutocreateandconfiguremockobjects.It’sespeciallyusefulwhenyouwanttoisolatetheclassundertestfromitsdependencies.Here’showtouseMockitoeffecti

Aug 13, 2025 am 01:26 AM

Securing Java Applications with JWT Authentication

JWTauthenticationinJavaapplicationsinvolvesunderstandingthetokenstructure(header,payload,signature)andtheflowwhereusersreceiveatokenafterlogin,whichisthenusedforauthorizedrequests.2.InSpringBoot,implementJWTbyaddingrequireddependencies,creatingaJwtUt

Aug 13, 2025 am 01:15 AM

Simplifying Data Access in Java with Spring Data JPA

SpringDataJPAeliminatestheneedforboilerplatecodeinJavadataaccessbyprovidingautomaticrepositoryimplementations,asshowninfivekeyways:1.ItgeneratesCRUDmethodslikesave(),findById(),anddeleteById()automaticallywhenarepositoryinterfaceextendsJpaRepository;

Aug 13, 2025 am 01:01 AM

java spring

How to use a for loop in Java

AforloopinJavarepeatscodeaspecificnumberoftimesusinginitialization,condition,andupdate;2.Itisidealwhenthenumberofiterationsisknown,suchasiteratingoverarraysorcounting;3.Commonpracticesincludedeclaringloopvariablesinsidethelooptolimitscopeandavoidingi

Aug 13, 2025 am 12:48 AM