Article Tags
Article Tags
Understand the constant restrictions and dynamic configuration strategies of Java annotations
The parameters of Java annotations must be compile-time constants, so values cannot be dynamically passed in directly from external configuration files such as application.properties. This article will delve into this design limitation of Java annotations and provide multiple alternatives, such as using Spring's @Value annotations, conditional annotations, or AOP, to achieve dynamic behavior control based on external configuration to meet business needs.
Dec 01, 2025 am 08:00 AM
Understanding Algorithm Time Complexity: Multivariable Functions and Worst-Case Analysis
This article provides an in-depth look at methods for analyzing the time complexity of algorithms, specifically for functions with multiple input variables. Through an example of the integer division algorithm, we analyzed in detail the origin of its exact complexity O(a/b), and distinguished the difference from simplified expressions such as O(a) or O(n). The article emphasizes the importance of accurately expressing complexity in multi-variable scenarios and clarifies applicable scenarios for worst-case analysis, aiming to improve readers' understanding of time complexity analysis.
Dec 01, 2025 am 06:45 AM
Java Regex: Precise whitespace separation control using forward lookahead assertions
This tutorial explores how to precisely control whitespace removal when using regular expressions for string splitting in Java. For specific needs that cannot be met by traditional split("\\s") or split("\\s "), the article details how to use the forward lookahead assertion \\s(?=\\S) to split only when a whitespace character is followed by a non-whitespace character, thus retaining the extra whitespace characters in the string. The tutorial includes code examples and Unicode compatibility considerations, aiming to help developers achieve more sophisticated text processing.
Dec 01, 2025 am 06:39 AM
Solve the problem of click event failure during Android View animation: attribute animation interacts with the view
When using Android's TranslateAnimation to displace a view, a common problem is that click events still respond to the original position of the view, rather than the animated display position. This is because TranslateAnimation only changes the drawing effect of the view and does not update its real physical boundaries. This tutorial will provide an in-depth explanation of this mechanism and guide you on how to use property animations such as ViewPropertyAnimator or ObjectAnimator to move the view correctly, ensuring that click events during animation accurately respond to the current position of the view.
Dec 01, 2025 am 06:18 AM
How to get the last element of a List in Java?
Use list.get(list.size()-1) to get the last element of the Java list. You need to check that the list is not empty first to avoid exceptions. You can also use Apache Commons' ListUtils.getLast() or the streaming reduce method, but the former is recommended.
Dec 01, 2025 am 04:47 AM
How to connect to a web socket in Java?
Answer: Use JSR356 or OkHttp to connect WebSocket. 1. JSR356 is suitable for the JavaEE environment. Define the client through @ClientEndpoint and connect with WebSocketContainer; 2. OkHttp is suitable for independent applications. After adding dependencies, create a WebSocketListener and initiate a request; 3. After connecting, you can send messages and handle events, and finally call close to close the connection.
Dec 01, 2025 am 04:43 AM
Implementing Tic-Tac-Toe victory condition detection using Java Streams and hybrid programming
This article explores how to use Java Streams combined with hybrid programming strategies to efficiently detect victory conditions in the Tic-Tac-Toe game. Aiming at the challenge that it is difficult to handle complex spatial logic purely using the Stream API, the article proposes a method that combines Stream.anyMatch() and local imperative logic by defining neighbor offsets. This solution can accurately determine whether the player's latest move forms a horizontal, vertical or diagonal winning combination, avoids unnecessary global traversal, and improves detection efficiency.
Dec 01, 2025 am 04:24 AM
Using Map to optimize list element batch processing in Spring Data JPA: Say goodbye to N 1 queries
This article aims to solve common N 1 query performance issues in Java when dealing with list elements. By optimizing a single database query within the loop into a one-time batch query and storing the results in the Map, efficient data search and update are achieved. This approach significantly reduces the number of database round-trips and improves the overall performance of the application.
Dec 01, 2025 am 04:00 AM
How to connect to an SFTP server in Java?
Using the JSch library, Java can be used to connect to the SFTP server. First add JSch dependencies, then create a Session through JSch, set the host, port, username and password, and disable host key check; then open the SFTP channel and connect, perform file list, upload, download and other operations; support password or SSH key authentication, after the operation is completed, the channel and session need to be disconnected to release resources.
Dec 01, 2025 am 03:42 AM
How to handle file uploads in a Java Spring Boot application?
SpringBoot simplifies file uploading by configuring the multipart attribute to limit the file size and enable functions. It uses @RequestParam to receive files and combines with MultipartFile to implement uploading. It needs to verify the type, purify the file name, store it in a safe path, and configure static resources to access uploaded files.
Dec 01, 2025 am 03:38 AM
Manual/automatic capture using Stripe
This article explains how to use Stripe to capture payment amounts manually and automatically. By setting the capture_method to manual, you can pre-authorize the PaymentIntent when creating it and capture it later manually using the capture endpoint. This will allow you to capture payments after a predetermined time, such as after an order has been shipped or a service has been completed.
Dec 01, 2025 am 03:27 AM
Solution to the missing SQL insertion statement log when Spring Boot integrates P6Spy
This article explores the problem that SQL insert statements are not logged correctly when using spring-boot-data-source-decorator to integrate with P6Spy. The core solution is to disable the default log category exclusions by setting the system property p6spy.config.excludecategories before P6Spy is initialized, thereby ensuring that SQL statements for operations such as batch updates can be fully captured and recorded.
Dec 01, 2025 am 03:03 AM
Java Stream API: Elegant implementation of JPA entity grouping and data conversion by fields
This article takes a deep dive into how to leverage the Java Stream API to efficiently and elegantly group a list of JPA entities and convert it into a list of specific fields. By combining Collectors.groupingBy and Collectors.mapping, the traditional loop traversal method can be replaced to achieve a simpler and more readable data aggregation logic, thereby improving code quality and processing efficiency.
Dec 01, 2025 am 03:00 AM
How to use generics in Java?
GenericsinJavaenabletype-safecodebyallowingclasses,interfaces,andmethodstooperateontypeparameters.1.GenericclasseslikeBoxholdanytypewithoutcasting.2.GenericmethodssuchasvoidprintArray(T[]array)workacrosstypes.3.Boundedtypeparameters(e.g.,TextendsNumb
Dec 01, 2025 am 02:58 AM
Hot tools Tags
Undress AI Tool
Undress images for free
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undresser.AI Undress
AI-powered app for creating realistic nude photos
ArtGPT
AI image generator for creative art from text prompts.
Stock Market GPT
AI powered investment research for smarter decisions
Hot Article
Popular tool
vc9-vc14 (32+64 bit) runtime library collection (link below)
Download the collection of runtime libraries required for phpStudy installation
VC9 32-bit
VC9 32-bit phpstudy integrated installation environment runtime library
PHP programmer toolbox full version
Programmer Toolbox v1.0 PHP Integrated Environment
VC11 32-bit
VC11 32-bit phpstudy integrated installation environment runtime library
SublimeText3 Chinese version
Chinese version, very easy to use
Hot Topics
20416
7
13574
4