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Technical Articles

Java

Introduction to Test-Driven Development (TDD) in Java

TDDinJavafollowsthered-green-refactorcycle:firstwriteafailingtest(red),implementminimalcodetopassit(green),thenrefactorwhilekeepingtestspassing.Thisapproachimprovescodequality,design,andmaintainabilitybyensuringtestsdrivedevelopment.UsingJUnit,develo

Aug 17, 2025 am 08:53 AM

java tdd

The solution that file upload test passed locally on Jenkins but failed on Jenkins

This article aims at the problem of failed file upload tests in Jenkins environment. By analyzing the error log and code snippets, it points out that the problem may be due to improper file path configuration. The article provides an easy solution to avoid code modification by placing uploaded files in a specified directory in the Jenkins workspace. At the same time, developers are reminded to pay attention to the file names in the error log to ensure the accurate positioning of the problem.

Aug 17, 2025 am 08:09 AM

How Java method references meet functional interface requirements: Compilation-time type matching parsing

This article discusses the compilation-time compatibility of method references and functional interfaces in Java. By analyzing how FeignException::errorStatus can be returned as an implementation of the ErrorDecoder interface, it reveals the principle of how the compiler automatically converts method references to functional interface instances based on method signature matching. The article explains the definition of functional interfaces, the types of method references, and the role of compilers in type inference and anonymous class generation, aiming to help developers understand this advanced feature of the Java language and improve the simplicity and readability of the code.

Aug 17, 2025 am 08:03 AM

How to dynamically change Android view background according to TextView content

This article details how to dynamically change the background color of other views (such as LinearLayout) in Android applications based on the text content of TextView. By using the setBackgroundResource() or setBackgroundColor() method, combined with the event listener, real-time update of view state is achieved. The tutorial covers core concepts, implementation steps, sample code, and key considerations, and is designed to help developers build responsive user interfaces.

Aug 17, 2025 am 08:00 AM

How to handle time zones in Java

Use ZonedDateTime and ZoneId classes in the java.time package to correctly handle time zones, 1. Avoid using old Date and Calendar classes; 2. Use ZonedDateTime to represent date and time with time zones; 3. Use withZoneSameInstant method to convert between different intervals; 4. Always store and transfer time in UTC; 5. Use DateTimeFormatter when parsing and formatting; 6. Use withEarlierOffsetAtOverlap or withLaterOffsetAtOverlap method when processing daylight saving time overlap time; 7. Always explicitly specify the time zone.

Aug 17, 2025 am 07:29 AM

How to read files for specific folders in Android Scoped Storage

This document is intended to guide developers on how to read files in specific folders in external storage via the Storage Access Framework (SAF) in the Scoped Storage environment of Android. Scoped Storage is a storage mechanism introduced by Android 10 (API level 29) to improve user privacy and data security. This article will provide detailed code examples to help developers understand how to use SAF and solve the problem of accessing specific directories in Scoped Storage.

Aug 17, 2025 am 07:27 AM

What are the data types in Java?

Javahastwomaincategoriesofdatatypes:primitiveandreferencetypes.PrimitivetypesarethebasicdatatypespredefinedbyJava,includingbyte,short,int,long,float,double,boolean,andchar,eachwithspecificsizesandranges,storeddirectlyinmemory,notallowingmethodsornull

Aug 17, 2025 am 07:25 AM

java type of data

What is an EAR file in Java?

AnEARfileisusedtopackageanddeployentireJavaEEapplicationsbybundlingmultiplemodulesintoasingleunit;itisnecessarywhendeployingcomplex,multi-moduleenterpriseapplicationsonJavaEEservers.1.EARstandsforEnterpriseArchiveandhasa.earextension,structuredasaZIP

Aug 17, 2025 am 07:21 AM

Data inconsistency problem and solution for ConcurrentHashMap in concurrent environment

This article aims to address the problem of data loss or inconsistency when using ConcurrentHashMap for concurrent writes. By analyzing the potential risks of put operations in a multi-threaded environment, and combining the invokeAll method of ExecutorService, it provides a solution to ensure that all threads complete the write operation and then perform subsequent processing, thereby ensuring the data accuracy of ConcurrentHashMap in a concurrent environment.

Aug 17, 2025 am 06:33 AM

What is a PreparedStatement in Java?

APreparedStatementinJavaisaprecompiledSQLstatementthatenablesefficientandsecureexecutionofparameterizedqueries.1.ItpreventsSQLinjectionbyusingplaceholders(?)andsettingparametersprogrammatically,ensuringuserinputistreatedasdata,notexecutablecode.2.Iti

Aug 17, 2025 am 04:59 AM

java

Java Swing: The correct way to display images on buttons

This article aims to solve the problem that buttons cannot display images in Java Swing programs. Help developers understand how to load and display images correctly with detailed code examples and step instructions, and provide some practical tips and notes to ensure that the images can be displayed successfully on buttons.

Aug 17, 2025 am 04:36 AM

what are checked and unchecked exceptions in java

Checkedexceptionsarecheckedatcompile-timeandmustbeeithercaughtordeclared,whileuncheckedexceptions,whichextendRuntimeException,arenotenforcedbythecompilerandtypicallyresultfromprogrammingerrors;checkedexceptionshandleexternal,recoverableconditionslike

Aug 17, 2025 am 04:16 AM

How to mock objects for testing in Java?

ToeffectivelymockobjectsinJava,usetheMockitoframeworktoisolatecodeundertestbysimulatingdependencies;first,addMockitotoyourprojectviaMavenorGradle,thencreatemocksusingMockito.mock()orthe@MockannotationinitializedwithMockitoAnnotations.openMocks()orthe

Aug 17, 2025 am 04:03 AM

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