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Technical Articles

Java

javaTutorial

How to add to an ArrayList in Java

Useadd(element)toappendanelementtotheendoftheArrayList;2.Useadd(index,element)toinsertanelementataspecificposition,shiftingsubsequentelementstotheright;3.UseaddAll(collection)toaddallelementsfromanothercollectiontotheend,oraddAll(index,collection)toi

Sep 03, 2025 am 08:53 AM

Mastering Java Concurrency with CompletableFuture

CompletableFuture is the core tool for handling asynchronous programming in Java. The answer lies in its non-blocking features that support chain calls, combination operations and exception handling. 1. Use supplyAsync or runAsync to create asynchronous tasks, and you can specify a custom thread pool to improve control power; 2. Use thenApply to convert results, thenAccept consumption results, and thenRun to perform subsequent operations to realize asynchronous chain calls; 3. Use thenCombine to merge two independent task results, thenCompose to realize serialization of dependent tasks, allOf waits for all tasks to complete, and anyOf responds to the first completion of the task; 4.

Sep 03, 2025 am 08:47 AM

Troubleshooting and Resolving the Problem of Duplicate Values ??when Generating IDs with Stored Procedures

This article provides an in-depth analysis of possible causes, including transaction missing, isolation level misuse, and potential risks of concurrent updates in response to the problem of duplicate values ??when generating IDs using Sybase database stored procedures. By providing improved stored procedure code examples and combining database lock mechanism considerations, we aim to help developers completely solve the ID duplication problem and ensure data consistency.

Sep 03, 2025 am 08:39 AM

what is a varargs in java

AvarargsinJavaallowsamethodtoacceptzeroormoreargumentsofthesametype,declaredwiththreedots(...)andmustbethelastparameter;1.Itsimplifiesmethodcallswhenthenumberofargumentsisunknown;2.Onlyonevarargsparameterisallowedpermethodandmustcomelast;3.Internally

Sep 03, 2025 am 08:37 AM

Use Selenium to handle web ad pop-ups: Switch the correct posture of the Frame

This article aims to solve the problem that ad pop-ups cannot be closed when using Selenium to automate web operations. Usually, this type of pop-up window is located in an iframe, and clicking directly on the element will fail. This article will introduce in detail how to locate and close pop-up windows by switching the Frame, and how to switch back to the default content after the operation is completed to ensure that subsequent operations are smooth.

Sep 03, 2025 am 08:36 AM

Java I/O vs. Java NIO: A Comprehensive Comparison

JavaI/O is a blocking stream model, suitable for low-concurrency simple scenarios; 1. JavaI/O is based on stream, read and write blocking, and each connection needs independent threads; 2. NIO is based on channel and buffer, supports non-blocking and multiplexing, and one thread can manage multiple connections; 3. NIO uses Buffer to achieve bidirectional, random access data processing; 4. NIO realizes event-driven through Selector, improving scalability under high concurrency; 5. NIO code is complex but has excellent performance, suitable for high concurrency and low active connection scenarios; 6. Actual performance is affected by the amount of concurrency and data, and NIO has obvious advantages in high concurrency; Therefore, JavaI/O is selected for low concurrency, and JavaNIO or its encapsulation framework such as Net

Sep 03, 2025 am 08:18 AM

java nio Java I/O

What is the Collections Framework in Java?

TheCollectionsFrameworkinJavaprovidesastandardizedwaytorepresentandmanipulatecollectionsofobjects,offeringreusable,high-performancedatastructuresthroughkeyinterfaceslikeCollection,List,Set,Queue,Deque,andMap;itensuresconsistency,performance,andrichfu

Sep 03, 2025 am 08:15 AM

java collection framework

Solve and best practices of JavaFX nested controller null problem

This article aims to solve the problem of nested controllers being null in JavaFX development and provide best practice guidance. By analyzing the naming rules for fx:id in the FXML file and the corresponding fields in the controller class, it explains in detail how to correctly inject nested controllers to avoid common misconfigurations. At the same time, the importance of following standard Java naming specifications is emphasized to improve the readability and maintainability of the code.

Sep 03, 2025 am 08:12 AM

Lucene Tutorial: How to build an empty query that does not match any document

In Lucene development, returning null directly can cause problems when a "empty" query that does not match any document is needed. This article will introduce how to use MatchNoDocsQuery to build a "null" query that is functionally equivalent to "empty", ensuring the standardization and stability of query behavior under specific business logic (such as when security verification fails), and avoiding potential null pointer exceptions or uncertain behavior.

Sep 03, 2025 am 08:03 AM

Calculate the number of JSON-driven questionnaire paths: Java recursive implementation

This document is intended to guide developers how to use Java and JSON data to calculate the number of all possible paths in a JSON configuration survey. We will use an actual questionnaire example to show how to effectively traverse all possible answer branches using a recursive algorithm and end up with the total number of paths. The point is to understand the application of recursion in solving such problems and how to adjust the recursion logic based on the JSON structure.

Sep 03, 2025 am 06:36 AM

What are enums and how are they used in Java?

EnumsinJavaareaspecialdatatypefordefiningafixedsetofnamedconstants,providingtypesafetyandimprovedcodereadability.1.Theyaredeclaredusingtheenumkeywordandeachconstantisimplicitlypublic,static,andfinal.2.Enumspreventinvalidvaluesbyensuringonlypredefined

Sep 03, 2025 am 06:22 AM

Implementation and optimization of complex multi-condition sorting in Java

This article explores in depth how complex multi-conditional sorting can be implemented in Java, especially for types with specific priorities (such as "Artist", "Producer", "Mixer") and the need to sort alphabetically on this basis. The article provides two main solutions: leveraging enumerations to define type priorities for code clarity and maintainability, and dynamically configuring string type priorities with Map, and demonstrates how to combine multiple sorting rules by chaining calls to Comparator to build robust and easy-to-understand sorting logic.

Sep 03, 2025 am 06:03 AM

Guide to the correct use of query parameters and request headers in HTTP requests

This article explores in depth the importance of correctly distinguishing and using query parameters from request headers in HTTP requests. An instance of sending weather API requests through Java explains in detail how to place the API key in the request header and how to correctly attach query parameters such as city names to the URL path. The article highlights best practices for following HTTP specifications and API documentation to avoid common "400 Bad Request" errors and recommends using advanced HTTP client libraries to simplify development.

Sep 03, 2025 am 05:57 AM

How to override a method in Java

Method overrides allow subclasses to provide concrete implementations of defined methods in parent class. 1. Use @Override annotation to ensure correct rewrite; 2. The subclass must inherit the parent class or implement the interface; 3. The rewrite method must have the same method name, parameter list, and return type (or covariant return type); 4. The access modifier cannot be stricter (such as public cannot become private); 5. Static, private and final methods cannot be rewritten; 6. The constructor cannot be rewritten, but the parent class constructor can be called through super(); finally polymorphic calls are implemented through object types, such as AnimalmyDog=newDog(); myDog.makeSound(); will output "Ba

Sep 03, 2025 am 05:13 AM

java Method overriding