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Technical Articles

Java

javaTutorial

A Guide to Building RESTful Web Services in Java with JAX-RS

JAX-RS is a Java standard used to build RESTfulWeb services, which simplifies development through annotations; 1. Using JAX-RS, you need to select implementations such as Jersey and add relevant dependencies in pom.xml; 2. Configure web.xml to register Servlet containers and specify resource package paths; 3. Create resource classes with @Path, @GET, etc. to define endpoints; 4. Use @Produces and @Consumes to process JSON and other media types, and cooperate with Jackson to achieve serialization; 5. Extract request parameters through @QueryParam, @PathParam, etc.; 6. Use ExceptionMapper to uniformly handle exceptions and return

Aug 23, 2025 am 07:45 AM

How to search an array in Java

UselinearsearchforunsortedorsmallarraysbyiteratingthrougheachelementwithO(n)timecomplexity.2.Forsortedarrays,applybinarysearchviaArrays.binarySearch()ormanualimplementationforO(logn)efficiency,ensuringthearrayissortedbeforehand.3.Whensearchingobjecta

Aug 23, 2025 am 07:44 AM

Garbage-First (G1) Garbage Collector in Java Explained

G1isthedefaultgarbagecollectorinOpenJDK11 designedforlargeheapsandpredictablepausetimes.2.Itdividestheheapintoequal-sizedregionsthatcandynamicallyserveasEden,Survivor,Old,orHumongousregions.3.G1prioritizescollectionofregionswiththemostgarbagetomeetpa

Aug 23, 2025 am 07:30 AM

Javax Validation: A Guide to Depth Verification of Collections (List) Elements

This article explores in-depth how to validate validation of each element in a Java collection such as List using the Javax Validation specification. By combining the latest features of Hibernate Validator and @Valid annotations, this tutorial will provide detailed explanations for applying constraint annotations on type parameters (such as @Email) and triggering verification on objects containing the collection, ensuring that each element in the collection complies with the expected validation rules, thus solving common set element verification difficulties.

Aug 23, 2025 am 07:27 AM

Implement web page collection function: use LocalStorage to store card data

This document will guide you how to implement a simple web collection function using JavaScript and LocalStorage. This feature allows users to add cards on web pages to favorites and view a list of favorites in a separate "favorites.html" page. This article will provide detailed code examples and steps to help you understand and implement this feature.

Aug 23, 2025 am 07:15 AM

Correct calls to abstract methods and instance methods in Java: Avoid static context errors

This article aims to resolve the common "non-static methods cannot be referenced from static context" error in Java development, especially when dealing with abstract classes and their subclasses. We will explore in-depth the essential difference between abstract methods, instance methods and static methods, analyze why calling their instance methods directly through abstract class names will lead to compilation errors, and provide the correct solution, that is, calling the abstract methods implemented by creating instances of concrete subclasses to ensure the correctness of the code and the principles of object-oriented design.

Aug 23, 2025 am 07:12 AM

Log4j 1.x Migrate to Log4j 2.x: Resolve XML configuration parsing errors

This document aims to help developers migrate projects from Log4j 1.x to Log4j 2.x, focusing on solving possible XML configuration parsing errors during the migration process, such as "The prefix "log4j" for element "log4j:configuration" is not bound". The article will provide detailed descriptions on how to modify XML configuration files to comply with the Log4j 2.x specifications and provide corresponding code examples.

Aug 23, 2025 am 07:09 AM

How to use CyclicBarrier in Java

CyclicBarrier is used in Java to make multiple threads wait for each other to a common barrier point, and continue to execute together after all threads arrive. 1. It belongs to the java.util.concurrent package, and creates a barrier by specifying the number of participating threads; 2. Optionally specify the Runnable task executed by the last arrive thread when the barrier is triggered; 3. Call the await() method to make the thread wait at the barrier until all threads call await(); 4. Unlike CountDownLatch, CyclicBarrier can be reused; 5. Support await with timeout to avoid infinite waiting; 6. Commonly used in multi-stage tasks, and

Aug 23, 2025 am 07:03 AM

Solutions for Android Dialog not to close correctly

This article provides a solution to the problem that custom Dialog cannot be closed normally in Android development. By analyzing the problem code, point out that repeatedly creating Dialog instances is the root cause of the inability to close. The article explains in detail how to correctly declare and use Dialog instances, and gives suggestions for optimizing the Dialog code structure to help developers avoid similar problems and improve code quality.

Aug 23, 2025 am 07:03 AM

what is the diamond problem in java

Javaresolvesthediamondproblembynotallowingmultipleinheritanceforclassesandrequiringexplicitmethodoverridingininterfaces;whenaclassimplementsmultipleinterfaceswithconflictingdefaultmethods,itmustmanuallyoverridethemethodorspecifywhichinterface’sversio

Aug 23, 2025 am 06:47 AM

Java Swing: JRadioButton Correct pose to convert the selected item to a string

In Java Swing applications, directly obtaining the text of the JRadioButton selected item through ButtonGroup.getSelection().toString(), you will usually get a meaningless memory address string. This is because getSelection() returns a ButtonModel object, and its toString() method does not provide the required text information. The correct way to solve this problem is to set an explicit "action command" for each JRadioButton and get the life through ButtonModel.getActionCommand()

Aug 23, 2025 am 06:24 AM

How to log messages with Log4j or SLF4J in Java

It is recommended to use SLF4J combined with Log4j2 for Java logging. 1. Add slf4j-api and log4j-slf4j2-impl dependencies; 2. Configure the log4j2.xml file to define the log format and level; 3. Get the SLF4JLogger instance through LoggerFactory.getLogger in the code and record the logs with parameterized messages; 4. Follow the log-level usage specifications, avoid recording sensitive information, and configure log rotation in the production environment, thereby achieving an efficient, flexible and maintainable log system.

Aug 23, 2025 am 05:57 AM

How to use a finally block in Java

Useafinallyblocktoensurecleanupcoderunsregardlessofexceptionsorearlyreturns.2.Thefinallyblockexecutesaftertryandcatchblocks,evenifanexceptionoccursorareturnstatementisencountered.3.Avoidreturn,break,orthrowinfinallytopreventmaskingexceptions.4.Prefer

Aug 23, 2025 am 04:41 AM

how to handle date and time in java 8

Handling dates and times in Java 8 is simpler and more intuitive. The answer is to use the class in the new java.time package: use LocalDateTime to represent dates without time zones, LocalDate and LocalTime to process only dates or time-only scenarios respectively, ZonedDateTime is used for date-time operations containing time zones, Instant is used for machine-readable timestamps, execute date arithmetic through plus and minus methods, use isBefore, isAfter and isEqual for comparison, use thread-safe DateTimeFormatter for formatting and parsing, and try to avoid using old ones

Aug 23, 2025 am 04:10 AM

date time java 8