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Technical Articles

Java

javaTutorial

Use oneOf in JSON Schema to avoid unnecessary enumeration errors

This article aims to help developers understand and resolve seemingly "false" enumeration errors that may occur when using JSON Schema's oneOf keyword for verification. We will analyze the causes of errors through a real case and provide corresponding solutions to ensure the validity and accuracy of JSON data.

Sep 10, 2025 am 09:42 AM

Generating suffix expressions from parse tree: Principles, implementations and common pitfalls

This article explores in-depth how to generate a suffix expression (Reverse Polish Notation) through parse trees. The core lies in the use of a post-order traversal algorithm, but the key to emphasizing that generating accurate suffix expressions is that the construction of the parse tree itself must correctly reflect the priority and binding of the operators. Through sample code and FAQ analysis, the article guides readers to understand and avoid conversion bias caused by tree structure errors.

Sep 10, 2025 am 09:39 AM

Optimization of Java code using conditional judgment: Improve readability and simplicity

This article aims to help Java developers optimize conditional judgment statements and improve the readability and simplicity of the code. By explaining how to use DeMorgan's law and invert the conditions, complex if statements are reduced to code that is easier to understand and maintain. This article will take into account specific examples to explore in-depth how to avoid empty if statements and provide best practices.

Sep 10, 2025 am 09:33 AM

Bukkit plugin development: a guide to correctly obtaining event triggering player names

In Bukkit plugin development, it is a common requirement to obtain player information from events. This tutorial will explore in-depth how to correctly obtain the player name that triggers the event in events such as BlockPlaceEvent to avoid the problem caused by misusing the Component object as a pure string. We will clarify the difference between Player objects and ItemStack display names and provide a simple and efficient implementation method.

Sep 10, 2025 am 09:27 AM

Solve the problem that Spring Boot third-party library beans cannot be injected: In-depth analysis and troubleshooting

This article discusses common problems when Spring Boot applications are unable to automatically discover and inject internally defined beans when integrating third-party libraries. We will deeply analyze Spring's component scanning mechanism, and focus on the library's pom.xml configuration, the correct use of @SpringBootApplication annotation, and potential packaging problems, and provide a system of troubleshooting and solutions to ensure that external beans can be loaded correctly by the main application context.

Sep 10, 2025 am 09:21 AM

Detailed explanation of the automatic update behavior of JScrollPane scrollbar

This tutorial will explore in-depth how to effectively control the automatic update behavior of JScrollPane scrollbars, especially keeping the scrollbar position unchanged when the content changes dynamically. By setting the scrollbar policy to NEVER, developers can prevent JScrollPane from automatically adjusting the value of its horizontal or vertical scrollbars, thereby achieving precise control of scrolling behavior, avoiding unnecessary UI jumps, and improving user experience.

Sep 10, 2025 am 09:15 AM

Controls the automatic update behavior of the JScrollPane scrollbar

This tutorial explores how to prevent JScrollPane from automatically adjusting the scrollbar position after content is updated or redrawn. The article will introduce in detail the automatic behavior of scroll bars by setting scroll bar policies (such as HORIZONTAL_SCROLLBAR_NEVER) to disable scroll bar automatic behavior, and explore the impact of adjusting viewport or internal component size on scrolling effect, helping developers to achieve precise control of JScrollPane scroll behavior.

Sep 10, 2025 am 09:06 AM

Kotlin nested class visibility and instance control: implementing parent class exclusive creation and external restricted access

This article explores how to implement a special nested class encapsulation pattern in Kotlin: This nested class can only be created by its external class, but its instances can be publicly accessed outside. By comparing the implementation methods of Java, the application of private, inner keywords and interfaces in Kotlin in detail in controlling the visibility and instantiation of nested classes is explained, and a variety of solutions and sample codes are provided, aiming to help developers choose the most appropriate encapsulation strategy based on specific needs.

Sep 10, 2025 am 07:12 AM

Sort specific columns of List in Java and find elements

This article describes how to sort the specified columns of List in Java and find specific elements. With a custom Comparator, sorting based on specified columns can be implemented. At the same time, a method is provided to find indexes for specific elements and demonstrate how to use this index for sorting and element search.

Sep 10, 2025 am 06:48 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 XML configuration file parsing errors that may occur during the migration process, especially the "The prefix "log4j" for element "log4j:configuration" is not bound" error. We will explain in detail how to modify XML configuration files to suit Log4j 2.x specifications and provide configuration examples.

Sep 10, 2025 am 06:39 AM

Troubleshooting and resolving the Spring Boot application's inability to connect to the Configuration Center

This article aims to help developers solve the problem that Spring Boot applications cannot obtain configuration from the Configuration Center. We will dig into the possible reasons and provide detailed configuration steps and troubleshooting to ensure that your application can successfully connect and load the remote configuration. Through this article, you will be able to quickly locate and resolve configuration center connection issues and improve development efficiency.

Sep 10, 2025 am 06:30 AM

How to use SOLID principles in Java development

The single responsibility principle requires that each class has only one responsibility, and the major category should be divided into sub-categories with clear responsibilities; 2. The opening and closing principle requires that classes are open to extensions and closed to modifications, and functional extension should be achieved through interfaces and polymorphisms; 3. The Richter replacement principle requires that subclasses can replace parent classes without destroying programs, and subclasses should not change the behavior contract of parent classes; 4. The interface isolation principle requires that clients should not rely on unwanted interfaces, and large interfaces should be split into small interfaces; 5. The dependency inversion principle requires that high-level modules do not rely on low-level modules, both of which should rely on abstraction, and decoupling should be achieved through dependency injection; applying these principles in Java can improve code maintainability, testability and extensibility, and ultimately make the software easier to understand and evolve in the long run.

Sep 10, 2025 am 06:02 AM

java development SOLID Principle

Method for efficiently checking nibble values ??in byte arrays in Java

This article explores how to efficiently check in Java whether the two nibbles of each byte in a byte array meet a specific numerical condition (e.g., whether it is greater than 9). By analyzing bit operations in detail (such as bitwise and sum shift), we show a better and faster solution than string conversion and provide clear code examples to help developers optimize byte data processing logic.

Sep 10, 2025 am 05:33 AM

Gradle multi-project construction and its dependency analysis problem and solutions

This article discusses in-depth the problem that in Gradle multi-project construction, subprojects cannot parse external libraries introduced by another subproject that they depend on. By analyzing the essential differences between Gradle implementation and API dependency configuration, two core solutions are provided: one is to configure the dependencies that need to be exposed to the outside in the shared module as API type to achieve transitive exposure; the other is to explicitly declare the required dependencies in the consumer module directly. The article aims to help developers understand and effectively solve dependency management challenges in multi-project environments and ensure smooth construction processes.

Sep 10, 2025 am 05:30 AM