Article Tags
Article Tags
How to write a simple JUnit test in Java? (@Test Example)
To write a simple JUnit5 test, you need to create a test method with @Test annotation, a test class ending with "Test", and use assertions such as assertEquals to verify the behavior; you also need to add junit-jupiter dependency in pom.xml.
Jan 02, 2026 am 12:27 AM
How to correctly implement breadth-first search (BFS) path finding in a two-dimensional maze
This article explains in detail the typical reasons why BFS fails to find the target value 9 in the 0/1/9 maze. It focuses on the problem of hash conflicts caused by not adding delimiters to the coordinate string hash keys, and provides a robust and reusable BFS implementation solution.
Jan 02, 2026 am 12:18 AM
How to use the ExecutorService for thread pooling in Java
ExecutorService simplifies thread management and reuse through thread pools in Java and improves performance. 1. Use Executors to create different thread pools: newFixedThreadPool, newCachedThreadPool, newSingleThreadExecutor, newScheduledThreadPool. 2. Submit Runnable or Callable tasks for asynchronous execution. 3. After the task is completed, shutdown, awaitTermination or shutdownNow must be called to safely shut down the service to prevent the JVM from being terminated.
Jan 02, 2026 am 12:13 AM
Correctly map parameter annotations to method parameters using ASM
This article aims to solve how to correctly map method parameter annotations to the corresponding parameters when using the ASM library to process Java bytecode. Since parameter indexing in the bytecode does not always coincide with parameter order in the method descriptor, especially in the presence of synthetic parameters, a way is needed to resolve this mismatch. This article will introduce a solution based on Java reflection implementation ideas and provide sample code for demonstration.
Jan 01, 2026 pm 12:00 PM
H2 Database Date Time Function Compatibility Guide: Resolving SYSUTCDATETIME Errors
This article aims to resolve the JdbcSQLSyntaxErrorException: Function "SYSUTCDATETIME" not found error encountered when using an H2 database. This error is usually caused by misuse of the SQL Server-specific SYSUTCDATETIME() function in an H2 environment. The tutorial explains in detail the equivalent datetime functions in H2 databases and provides examples of using the CURRENT_TIMESTAMP alternative to ensure smooth data insertion operations.
Jan 01, 2026 am 11:45 AM
Customize the bean name generator in Spring Boot tests to resolve naming conflicts
This article explores how to resolve BeanDefinitionOverrideException by customizing the Bean name generator when introducing multiple components with the same name but different packages in Spring Boot integration tests. By defining a @Configuration configuration class inside the test class, and combining @ComponentScan to specify FullyQualifiedAnnotationBeanNameGenerator and basePackageClasses, you can effectively create an isolated and conflict-free Bean context for the test environment, ensuring the stability and accuracy of the test.
Jan 01, 2026 am 11:42 AM
Use regular expressions to check specific string formats in Java
This article details how to use the `String.matches()` method combined with regular expressions in Java to verify whether a string conforms to a specific format, such as the "Alphabetic Alphanumeric" (LLNN) pattern. The article deeply analyzes the composition of regular expressions, provides complete code examples, and discusses exception handling and related considerations, aiming to help developers implement string format verification functions efficiently.
Jan 01, 2026 am 11:33 AM
Advanced data filtering strategies for web service data control in JDeveloper
This article aims to address the challenge of the lack of "naming guideline" filtering capabilities for Web service data control in JDeveloper. To address this problem, we have proposed two core solutions: one is to complete data pre-filtering on the server side by modifying or implementing Web services; the other is to obtain Web service data into the POJO model on the client side, and then implement data filtering and sorting through programming. The article will elaborate on the implementation ideas, advantages and disadvantages, and applicable scenarios of these two methods.
Jan 01, 2026 am 11:30 AM
How to convert nested list object to flattened single element list in Java
This article explores various strategies for converting a collection of objects containing nested lists into a new list in Java, with the goal of making each object in the new list contain only one element from its nested list. By introducing in detail the traditional iteration method of Java 7, the Stream API flatMap operation of Java 8-15, and the mapMulti method of Java 16 and above, the article provides clear code examples and professional guidance to help developers efficiently reconstruct data structures to meet specific business needs while maintaining the integrity of the original object properties.
Jan 01, 2026 am 11:24 AM
SQL Query String Building: Best Practices for Handling Quoted Identifiers
This article explores how to correctly handle identifiers containing double quotes in SQL statements, such as numbers as column aliases, when building SQL queries using StringBuilder in languages such as Java. Core solutions include escaping double quote characters with backslashes or adopting the more recommended way of naming unquoted identifiers to improve code readability and maintainability and avoid common syntax errors.
Jan 01, 2026 am 11:09 AM
Best practices for entity sharing between Maven projects: modularization and dependency management
This article explores ways to efficiently share entity classes in Maven projects. The core strategy is to encapsulate entities as independent Maven modules and introduce them into other projects through dependency management mechanisms. The article details the mvn clean install process in a local development environment, as well as the solution of using warehouse tools such as Artifactory for dependency management in team collaboration or production environments. It also briefly mentions alternative ways to directly import JAR, aiming to provide a clear and professional guide to entity sharing.
Jan 01, 2026 am 11:06 AM
Practical Guide to Select Element Operations in Selenium Automated Testing
This tutorial details how to effectively manipulate HTML drop-down menus in Selenium automated tests. The article first explains the basic usage of Selenium Select class, including selecting options by value, index and visible text. Then, it provides an in-depth analysis of common problems that may be encountered in actual operations when elements cannot be interacted or cannot be found, and provides two solutions: using Thread.sleep() for simple waiting (not recommended) and using WebDriverWait to implement intelligent explicit waiting to ensure the robustness and reliability of the script.
Jan 01, 2026 am 10:48 AM
Java Stream implements CSV file data merging tutorial
This tutorial shows you how to use Java Stream to combine data read from multiple CSV files. The emphasis is on maintaining read order, and an example based on city and country data is provided to show how data association and merging can be achieved through forEach and filter operations.
Jan 01, 2026 am 10:36 AM
Java Eclipse plug-in development: detecting and tracking 'dirty' files in projects
This article will delve into how to effectively detect and track "dirty" files that have been modified but not yet saved in the project during Eclipse plug-in development. We will focus on using the IResourceChangeListener and IResourceDelta mechanisms to monitor workspace resource changes, identify file content modifications, and discuss how to build a custom file status tracker to manage the "dirty" and "saved" status of files.
Jan 01, 2026 am 10:33 AM
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