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Technical Articles

Java

javaTutorial

What are the different types of collections in Java?

Java's collection framework includes five core types: List, Set, Queue, Deque and Map. List is an ordered and repetitive collection. Commonly used implementations include ArrayList, LinkedList and Vector. Set does not allow duplicate elements, and its main implementations include HashSet, LinkedHashSet and TreeSet. Queue follows the FIFO principle for sequential processing, and is typically implemented as LinkedList, PriorityQueue and ArrayDeque. Deque supports dual-ended operations and is commonly used as ArrayDeque. Although Map does not belong to the Collection interface, it is a core component.

Aug 22, 2025 am 12:22 AM

data structure java collection

Guide to resource sharing and configuration management in Maven multi-module projects

This article aims to address common problems in cross-module access resources (such as configuration files) in Maven multi-module projects. We will explore how to use Maven's dependency mechanism and combine standard resource management practices to achieve safe, efficient and maintainable resource sharing, and avoid bad practices such as file replication. The article will elaborate on the importance of putting resources in the right place and provide sample code to access resources through class loaders to ensure compatibility of applications in different environments.

Aug 21, 2025 pm 01:42 PM

HK2 Dependency Injection: Extended and Custom Binding Annotation Implementation

This article explores in-depth how to extend the default dependency injection mechanism under the Jersey/HK2 framework to support custom annotations (such as @Repository) rather than being limited to the built-in @Service and @Contract. By introducing AbstractBinder and Reflections libraries, the article elaborates on how to manually bind interfaces and implement classes, and provides specific code examples to help developers flexibly configure and manage application service layer and data access layer dependencies to achieve more refined control and decoupling.

Aug 21, 2025 pm 01:33 PM

Convert Java current time to seconds

This article describes how to convert the current time to seconds starting from the day in Java, and provides two ways to use java.time.LocalTime. The point is to avoid using System.currentTimeMillis() directly, as it returns milliseconds since epoch, not seconds since the day. In addition, the article highlights the importance of time zones and provides examples of how to specify a time zone to ensure that the code performs consistently in different environments.

Aug 21, 2025 pm 01:24 PM

Use this reference as a best practice for Supplier

This article explores how to effectively pass this reference to the Supplier interface in a Java 8 environment, especially in asynchronous programming scenarios such as CompletableFuture. We will analyze the advantages and disadvantages of directly using this and method reference this::self and provide best practice suggestions to help developers avoid unnecessary object allocation and improve code performance.

Aug 21, 2025 pm 01:21 PM

Calculate days, hours, minutes, and seconds between two dates and times in Java

This article describes how to calculate the number of days, hours, minutes, and seconds elapse between a given date and time (formatted in "Wednesday 02-October-2022 11:51:1 PM") and the current date and time using Java. The article explains in detail how to use DateTimeFormatter to parse date and time strings, how to deal with time zone problems in combination with ZoneId, and how to use Duration to calculate time difference.

Aug 21, 2025 pm 01:15 PM

Grade points based on letter grades: Java Tutorial

This article aims to guide readers on how to write a Java program that can calculate and output corresponding grade points based on the letter grades entered by the user. The program converts letter levels to grade points through the qualityPoint method and uses the try-catch block to process invalid inputs to ensure the robustness of the program. This article will introduce the code implementation in detail and provide necessary precautions to help readers understand and apply the program.

Aug 21, 2025 pm 01:09 PM

Maven multi-module project: cross-module resource file access and management

This article aims to solve common problems in accessing resource files across modules in Maven multi-module projects. By exploring the dependency management mechanism of Maven in depth, we will explain how to incorporate resources of one module into the classpath of another module, and use the ClassLoader.getResourceAsStream() method to read these resources safely and efficiently, thereby avoiding manual copying of files and improving project maintainability.

Aug 21, 2025 pm 01:06 PM

Build flexible functions: Use Builder mode to handle functions or floating point parameters

This article describes how to use the Builder pattern to gracefully handle function parameters or floating point parameters, avoid code duplication, and provide a more flexible API design. Through the example code, we show in detail how to build a RangeBuilder class that accepts functions or floating-point numbers as parameters and use them to generate functions for Streams, thereby simplifying the input of dynamic values, especially for scenarios such as creative programming that require flexible parameter configuration.

Aug 21, 2025 pm 01:00 PM

Android development: Implement the automatic button activation after the ProgressBar is loaded

This tutorial details how to automatically enable a button when the progress bar (ProgressBar) completes loading in an Android application. We will configure ProgressBar through XML layout and simulate the loading process using CountDownTimer in Java code, which triggers the enablement of the button after the load is over, ensuring that the user can only proceed with the next step after the data or task is ready.

Aug 21, 2025 pm 12:57 PM

Java Swing: Correctly get the text value of the JRadioButton selected item

This article aims to guide developers on how to correctly obtain the text value of JRadioButton selected items in Java Swing. Calling ButtonGroup.getSelection().toString() directly usually returns meaningless memory addresses. The correct solution is to use JRadioButton's setActionCommand method to associate a custom string for each button, and safely extract the text information of the selected item through the ButtonModel's getActionCommand method to ensure the accuracy of data acquisition.

Aug 21, 2025 pm 12:45 PM

JavaFX: Controls the stacking order of Shape to achieve visual occlusion effect

This article provides an effective solution to the problem of stacking and display of Shape objects in JavaFX applications. When multiple Shape objects overlap, it is crucial to control the order in which they are displayed. This article will introduce how to use the setViewOrder() method to adjust the cascade order of Shape objects to achieve visual occlusion and provide sample code for demonstration. By studying this article, developers can easily solve the problem of stacking and displaying Shape objects in JavaFX applications and improve user experience.

Aug 21, 2025 pm 12:39 PM

Correct configuration and practice of Swagger UI access path in Spring Boot application

This tutorial explains in detail how to properly integrate and configure the Swagger UI, the API documentation tool, in a Spring Boot project, and emphasizes the use of the modern springdoc-openapi-ui library. The article covers the complete process from introducing dependencies, removing legacy configurations to accessing API documents and UI interfaces, and provides code examples and precautions, aiming to help developers efficiently solve common problems such as "No mapping for GET /swagger-ui.html" and improve API development and debugging efficiency.

Aug 21, 2025 pm 12:33 PM

Log4j 1.x Migration to Log4j 2.x FAQs and Solutions

This document is intended to help developers successfully migrate projects from Log4j 1.x to Log4j 2.x. We will focus on addressing XML configuration issues that may be encountered during the migration process, especially the "The prefix "log4j" for element "log4j:configuration" is not bound." error, and provide detailed configuration examples and considerations to ensure a smooth transition.

Aug 21, 2025 am 11:54 AM