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Technical Articles

Java

javaTutorial

How to use the Stream API in Java

Java's StreamAPI provides a declarative and functional data processing method. The answer is to create streams and chain calls intermediate and terminal operations to achieve efficient data processing. 1. You can create streams from collections, arrays, Stream.of(), generate or iterate; 2. Intermediate operations such as filter, map, flatMap, distinct, sorted, limit and skip are used to convert and filter data, and are lazy execution; 3. Terminal operations such as forEach, collect, reduce, match operations and findFirst trigger actual calculations and produce results; 4. In actual applications, filter can be used

Aug 17, 2025 am 10:27 AM

java

What is the difference between Serializable and Externalizable in Java?

ThemaindifferenceisthatSerializableusesautomaticserializationwithreflection,requiringnomethods,whileExternalizableprovidesfullcontrolthroughwriteExternal()andreadExternal(),demandsano-argconstructor,improvesperformancebyreducingmetadata,andisusedwhen

Aug 17, 2025 am 09:33 AM

java Serialization

Tutorial for finding the first non-repeat character in a string

This article aims to provide a clear and concise tutorial on how to efficiently find the first non-repetitive character from a given string. We will dig into the solution, provide sample code, and explain the logic behind it, ensuring that the reader can understand and apply the method.

Aug 17, 2025 am 08:57 AM

Building a Full-Stack Application with Java and React

Tobuildafull-stackJavaandReactapplication,startbystructuringtheprojectwithseparatebackend(SpringBoot)andfrontend(React)directories.2.SetupthebackendusingSpringInitializrwithdependencieslikeSpringWeb,SpringDataJPA,andoptionallySpringSecurityandLombok,

Aug 17, 2025 am 08:56 AM

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