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Technical Articles

Java

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

How to avoid deadlocks in Java

Deadlock occurs in Java when multiple threads are waiting for resources held by each other and block permanently, the following 6 methods can be effectively prevented: 1. Always acquire the lock in a consistent order to avoid loop waiting; 2. Use tryLock() with timeout to make the thread actively give up when it cannot acquire the lock; 3. Minimize the range and holding time of the lock to avoid time-consuming operations in the synchronous block; 4. Try to avoid nested locks and use the thread-safe class or message delivery mechanism in java.util.concurrent; 5. Make method calls outside the synchronous block (open call) to prevent indirectly leading to lock competition; 6. Use thread dumps, JVM analysis tools and static inspection tools to detect potential deadlocks. By rationally designing lock strategies and reducing concurrency

Sep 10, 2025 am 05:21 AM

How to avoid memory leaks in Java?

Avoidlong-livedstaticfieldsbylimitingtheiruseandapplyingcleanuporweakreferences;2.Unregisterlistenersoruseweakreferencesandlambdastopreventobjectretention;3.Alwaysusetry-with-resourcestoclosestreamsandconnectionsproperly;4.Preferstaticinnerclassesand

Sep 10, 2025 am 05:09 AM

What is a Comparator in Java?

AComparatorinJavaisaninterfacethatenablescustomsortinglogicoutsideaclass,allowingmultipleorderingoptionsforthesameobjects;itworksviathecompare(To1,To2)methodwhichreturnsanegative,zero,orpositivevaluebasedonthedesiredorder,andiscommonlyusedwithcollect

Sep 10, 2025 am 04:56 AM

How to replace a string after a specific string in Java

This article describes how to elegantly replace strings after specific words in text in Java. By using the replaceFirst method and simple regular expressions, we can easily achieve this, avoiding writing verbose and complex code. This article will provide clear code examples and notes to help you master this trick quickly.

Sep 10, 2025 am 04:42 AM

How to convert an array to an ArrayList in Java

Use Arrays.asList() combined with ArrayList constructor to convert an object array into a mutable ArrayList; 2. For basic arrays such as int[], it is necessary to convert through manual loops or Java8's Arrays.stream().boxed().collect(); 3. Use streams to also implement filtering and mapping operations during conversion. You should select the appropriate method based on the array type and whether you need to modify the list, and finally get a dynamically adjustable ArrayList object.

Sep 10, 2025 am 04:42 AM

Java selection sorting: step by step display of algorithm execution process

This tutorial explains in detail how to implement the selection sorting algorithm in Java, and highlights how to modify existing code to print the current state of the array after each iteration is completed. By adding print statements to the main sort loop, users can clearly track each step of the algorithm to better understand how the selection sort works.

Sep 10, 2025 am 04:12 AM