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What is JDBC in Java?

JDBC,orJavaDatabaseConnectivity,isastandardAPIthatenablesJavaapplicationstointeractwithrelationaldatabaseslikeMySQL,PostgreSQL,Oracle,andSQLServerbyactingasabridgebetweenthem.ThekeycomponentsincludeDriverManagerformanagingdatabasedriversandestablishi

Aug 24, 2025 pm 03:04 PM

java jdbc

How to use a List in Java

ChooseArrayListformostusecasesduetobetterperformance,orLinkedListforfrequentinsertions/deletions;2.Addelementswithadd(),accesswithget(),andchecksizewithsize();3.Modifyelementsusingset()andremoveelementsviaremove()byindexorvalue,avoidinginvalidindexes

Aug 24, 2025 pm 02:00 PM

How to create a custom annotation in Java

Definition annotations Use the @interface keyword to create custom annotations and set elements and their default values; 2. Use @Target, @Retention and other meta annotations to control the applicable goals, retention policies and other behaviors of annotations; 3. Apply custom annotations on program elements such as classes and methods, and use full parameters or abbreviations; 4. Read annotation information at runtime through reflection, and be sure to use RetentionPolicy.RUNTIME retention policy; custom annotations enhance the code function through metadata, and combine reflection to achieve flexible runtime processing, and end completely.

Aug 24, 2025 pm 01:54 PM

The Ultimate Guide to Java Interview Questions for Senior Roles

SeniorJavainterviewstestdeeptechnicalexpertise,requiringmasteryofconcurrency,JVMinternals,systemdesign,advancedlanguagefeatures,andSpring.2.Forconcurrency,understandsynchronized,ReentrantLock,JMM,andtoolslikejstackandjmh,andproviderealexamplesofreduc

Aug 24, 2025 pm 01:41 PM

java interview 高級(jí)職位

How to create a scheduled task in Java?

UseScheduledExecutorServiceforschedulingtasksinJava,asitsupportsthreadpoolingandbettererrorhandling.2.CreateaScheduledExecutorServiceinstanceusingExecutors.newSingleThreadScheduledExecutor().3.DefinethetaskasaRunnabletobeexecuted.4.Schedulethetaskusi

Aug 24, 2025 pm 01:40 PM

What is the difference between Stream.map() and Stream.flatMap() in Java?

ThekeydifferenceisthatStream.map()performsaone-to-onetransformation,mappingeachelementtoexactlyonenewelement,whileStream.flatMap()performsaone-to-manytransformationbyconvertingeachelementintoastreamandthenflatteningallstreamsintoasinglestream;forexam

Aug 24, 2025 pm 01:21 PM

Responsive stream processing null values ??and custom exception throwing in Spring WebFlux

This article aims to explore how to gracefully handle null values ??that may appear in responsive streams in Spring WebFlux responsive programming and throw a custom exception when null is detected. We will dig into why using map directly with switchIfEmpty or filter cannot achieve the expected results, and provide two recommended solutions: flatMap and handle operators to ensure the robustness of responsive streams and the accuracy of error handling.

Aug 24, 2025 pm 12:18 PM

Deeply understand the thread context inheritance mechanism and advanced applications of Log4j2 ThreadContext

Log4j2's ThreadContext is thread-local by default. Even if the isThreadContextMapInheritable system property is enabled, the child thread can only obtain a copy of the parent thread ThreadContext, rather than a shared reference. This means that the ThreadContext of the parent-child thread will evolve independently after creation, and modifying the value of either party will not affect the other party. If you need to implement dynamically shared or globally accessible log context data, you should consider using advanced extension mechanisms such as custom context data injectors provided by Log4j2 (such as implementing the ContextDataProvider interface).

Aug 24, 2025 pm 12:09 PM

Solve the chunking transfer problem encountered by Apache CXF when sending byte arrays in JAX-RS

This article discusses the problem of sending a raw byte array as a REST API request body when using OpenLiberty and Apache CXF as JAX-RS implementation. The core reason is that the block transmission encoding used by Apache CXF by default is incompatible with the target server. The solution is to configure the receiver server to support chunked transmission, so as to ensure that the data transmission protocol between the client and the server is consistent and the upload of byte arrays is successfully implemented.

Aug 24, 2025 am 11:54 AM

What is the Queue interface and its common implementations in Java?

The Queue interface in Java follows the FIFO principle, but the priority queue and other implementations can be sorted based on priority; 1. LinkedList: non-thread-safe, supports null, suitable for single-thread simple queues; 2. PriorityQueue: non-thread-safe, based on heap structure, sorted by priority, and does not allow null; 3. ArrayDeque: non-thread-safe, high-performance, null cannot be stored, recommended to replace LinkedList; 4. ConcurrentLinkedQueue: thread-safe, based on CAS, suitable for high concurrency; 5. BlockingQueue implementation classes such as ArrayBlockingQueue, Linke

Aug 24, 2025 am 11:53 AM

java queue

Calculate the number of possible paths to JSON-driven questionnaire

This article describes how to calculate the number of all possible paths in a question-based survey using Java and JSON data. With the recursive method, we can iterate over the JSON structure and determine the total number of paths from the start problem to all possible end points. This article provides detailed code examples and explanations to help you understand and implement the algorithm so that you can better analyze and manage survey data.

Aug 24, 2025 am 11:51 AM

Calculate the number of possible paths to JSON-driven questionnaire: Java recursive method

This article describes how to use Java and recursive algorithms to calculate the number of all possible paths in a survey based on JSON configuration. We will explain in detail how to parse the JSON structure and use recursive functions to iterate through each branch of the questionnaire and finally calculate all possible completion paths. In addition, some of the advantages and limitations of this approach will be discussed and optimization suggestions are provided.

Aug 24, 2025 am 11:42 AM

Common reasons and solutions for Android Dialog not to be turned off

This article analyzes the common reasons why Dialog cannot be closed normally in Android development, and provides detailed steps and code examples to solve this problem by holding Dialog instances in Activity and placing Dialog initialization and configuration inside Dialog class to help developers avoid similar errors and ensure that Dialog is displayed and closed correctly.

Aug 24, 2025 am 11:39 AM

Solutions for GWT clients to inject values ??using Guice @Named annotation

This article aims to solve problems encountered when using Guice's @Named annotation for dependency injection in GWT client code. Due to the particularity of the GWT client environment, directly using Guice to inject static values ??will throw an error. This article will introduce how to bind static values ??to the client through AbstractGinModule, and how to obtain dynamic values ??from the server through GWT RPC, thereby avoiding the limitation of directly using Guice on the client.

Aug 24, 2025 am 11:36 AM