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Technical Articles

Java

How to create and start a thread in Java by extending the Thread class

To create and start a thread by inheriting the Thread class, you need to define the class to inherit Thread and overwrite the run() method, then create an instance and call the start() method; 1. Create a class that inherits Thread, overwrite the run() method, which contains the code executed by the thread; 2. Instance the class and call the start() method to start the thread, so that run() can be executed in a new thread; note that run() cannot be called directly, and each thread object can only call start() once. It is recommended to use the Runnable interface to avoid inheritance restrictions, but inheriting Thread is suitable for simple scenarios or learning purposes.

Sep 06, 2025 am 04:41 AM

Load Testing and Stress Testing Java Applications

Loadtestingevaluatessystemperformanceunderexpectedloads,whilestresstestingpushesthesystembeyonditslimitstoobservefailureandrecovery.1.ForloadtestingJavaapps,definerealisticuserscenariosusingtoolslikeJMeter,Gatling,ork6.2.Simulateconcurrentusers,monit

Sep 06, 2025 am 04:24 AM

java Performance Testing

Infinite Series Summarization: Tutorial on Solving Fractional Equations in Interval

This article aims to guide readers on how to calculate the sum of infinite fraction equations within a specified interval. By analyzing the code in the problem, pointing out the existing problems, and providing an improved code example. The improved code can more accurately calculate the sum of series within a given interval, and explain in detail the implementation logic and key steps of the code, helping readers understand the principles and methods of summing infinite series.

Sep 06, 2025 am 04:21 AM

What is the difference between an array and an ArrayList in Java?

ThemaindifferencebetweenanarrayandanArrayListinJavaisthatarrayshaveafixedsizewhileArrayListsaredynamicandcangroworshrinkautomatically;arrayscanstorebothprimitivesandobjects,whereasArrayListscanonlystoreobjects,requiringwrapperclassesforprimitives;arr

Sep 06, 2025 am 04:16 AM

How to add or subtract days from a date in Java

UseLocalDatefordate-onlyoperations,LocalDateTimefordateandtime,andZonedDateTimefortimezones;2.AdddayswithplusDays()andsubtractwithminusDays();3.Thesemethodsreturnnewinstancessincejava.timeobjectsareimmutable;4.Chainoperationsaresupported,suchasplusDa

Sep 06, 2025 am 03:46 AM

java date calculation

How to handle POST requests in Java with Spring Boot

AddSpringWebdependencyinpom.xmlforhandlingHTTPrequests.2.CreateamodelclasslikeUserwithfields,constructors,andgetters/setters.3.Use@RestControllerand@PostMappingtodefineanendpointthatacceptsPOSTrequests.4.Use@RequestBodytobindJSONdatatothemodelobjecta

Sep 06, 2025 am 03:04 AM

What is the purpose of the hashCode() method in Java?

ThehashCode()methodinJavageneratesanintegervalueusedbyhash-basedcollectionslikeHashMapandHashSettoefficientlystoreandretrieveobjectsbydeterminingthebucketlocation;itmustbeoverriddenalongsideequals()toensurethatequalobjectsproducethesamehashcode,maint

Sep 06, 2025 am 02:40 AM

java hashcode

Professional processing strategy for POST request redirection in Rest Assured

Rest Assured automatically handles 302 redirects for GET/HEAD requests by default, but for POST requests, especially 307 temporary redirects, they will not be automatically tracked. This article will introduce in detail how to manually handle redirecting POST requests in Rest Assured, including capturing redirect information, constructing subsequent requests, and processing session status to ensure the accuracy and robustness of API testing.

Sep 06, 2025 am 02:24 AM

How to run a Java program from the command line

EnsureJDKisinstalledandverifywithjava-versionandjavac-version.2.CreateaJavafilenamedHelloWorld.javawithamatchingclassnameandcorrectmainmethod.3.CompileusingjavacHelloWorld.javatogeneratethe.classfile.4.RuntheprogramwithjavaHelloWorld,ensuringcorrectc

Sep 06, 2025 am 02:22 AM

How to use an interface in Java

Definetheinterfaceusingtheinterfacekeyword,declaringabstractmethodslikestart(),stop(),andgetSpeed()inDrivable;2.Implementtheinterfaceinaclasswiththeimplementskeyword,providingconcreteimplementationsforallabstractmethods,asCardoesforDrivable;3.Usethei

Sep 06, 2025 am 01:37 AM

Deep parsing and best practices for JavaFX nested controller injection

This article explores in-depth common problems that cause NullPointerException by failing injection of nested controllers in JavaFX. The core reason is that the fx:id does not match the controller field naming rules. By analyzing the FXML loading mechanism in detail, the article provides a solution that complies with the Java naming specifications, and emphasizes the conventional naming pattern between fx:id and associated controller fields, aiming to help developers build clear-cut and maintainable JavaFX componentized applications.

Sep 05, 2025 pm 12:57 PM

Solve the Android calculator application crash problem: string parsing and null value processing

This article aims to help developers solve the crash problem caused by string parsing in Android calculator applications. By checking the null value of the result displayed on the calculator screen and handling it appropriately, the exceptions raised by the Double.parseDouble() method when parsing an empty string can be avoided, thereby improving the stability of the application and user experience. This article will provide detailed solutions and code examples to help you build more robust Android calculator applications.

Sep 05, 2025 pm 12:51 PM

How to prevent RecyclerView from refreshing all data when adding new data

This article describes how to use the DiffUtil class to optimize data updates for RecyclerView to avoid refreshing the entire list when new data is added, thereby improving performance and user experience. By implementing a custom DiffUtil.Callback, you can accurately calculate the differences between old and new datasets and update only the view items that need to be changed.

Sep 05, 2025 pm 12:48 PM

MapStruct Advanced Application: Map Foreign Key IDs in DTO to Associated Entity Objects

This tutorial explains in detail how to correctly map the ID field in the Data Transfer Object (DTO) that represents a foreign key to the corresponding ManyToOne associated entity in the entity object when using MapStruct for object mapping. By converting the MapStruct mapper to an abstract class and injecting Repository, a custom parsing method is implemented to ensure that the foreign key ID can be effectively converted into a complete associated entity object, thus solving the problem that the default map cannot handle ID-to-entity conversion.

Sep 05, 2025 pm 12:45 PM