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Technical Articles

Java

javaTutorial

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

Java Performance Profiling with JFR and Java Mission Control

JFRandJMCareessentialforJavaperformanceprofiling,providinglow-overhead,deepinsightsintoJVMbehavior.1.StartJFRviacommandlineusingjcmdwithoptionslikeduration,filename,andnameforcontrol.2.EnableatJVMstartupwith-XX: FlightRecorderand-XX:StartFlightRecord

Aug 12, 2025 pm 03:05 PM

java JFR

The Best IDEs for Java Development: A Comparative Review

ThebestJavaIDEin2024dependsonyourneeds:1.ChooseIntelliJIDEAforprofessional,enterprise,orfull-stackdevelopmentduetoitssuperiorcodeintelligence,frameworkintegration,andtooling.2.UseEclipseforhighextensibility,legacyprojects,orwhenopen-sourcecustomizati

Aug 12, 2025 pm 02:55 PM

java ide

A Practical Guide to File I/O in Modern Java (NIO.2)

NIO.2inJavaprovidesamodern,efficientapproachtofilehandling.1.UsePathandFilesclassesforfileoperations,preferringPath.of()forcleanercode.2.ReadorwritesmallfileswithFiles.readAllLines()andFiles.write(),usingStandardOpenOption.APPENDtoappenddata.3.Forlar

Aug 12, 2025 pm 02:40 PM

java text i/o

What is JDK in Java?

YouneedtheJDKtowrite,compile,andrunJavaprograms;itincludesdevelopmenttoolslikejavac,java,javadoc,jdb,jar,andjshell,alongwiththeJREandJVM,makingitessentialfordevelopers,whileJREalonesufficesforrunningapplicationsbutnotfordevelopment,andmostdeveloperst

Aug 12, 2025 pm 02:35 PM

How to use the instanceof operator in Java

instanceofchecksifanobjectisaninstanceofaspecifiedclass,subclass,orinterfaceandreturnstrueorfalse.2.Itisusedwithinheritancetoverifyanobject’sactualtypeatruntime,suchascheckingifaDogobjectreferencedasAnimalisindeedaDog.3.Itenablessafedowncastingbyprev

Aug 12, 2025 pm 02:31 PM