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Technical Articles

Java

javaTutorial

Common pitfalls and solutions for Mock object injection and method verification in Mockito test

This article explores the common InvocationTargetException and verification failure issues in Mockito/PowerMock tests. The core is to understand how the object being tested obtains its internal dependencies. The article will explain in detail how to control dependency creation by staked the internal methods of spy objects, and correctly use MockitoJUnit.rule() for test settings, and compare the differences between spy and InjectMocks, provide clear sample code and best practices to help developers build robust unit tests.

Sep 07, 2025 am 10:54 AM

Variable occlusion in Java inheritance: In-depth understanding and solutions

This article explores the common variable shadowing problem in Java inheritance and explains how it causes the conditional judgment logic to fail. By analyzing the declaration mechanism of the same name variable in parent and child classes, clear code examples and solutions are provided, aiming to help developers avoid such traps and ensure the correctness and predictability of object-oriented design, especially in implementations of the dependency inversion principle (DIP).

Sep 07, 2025 am 10:48 AM

Java Tutorial: Remove punctuation marks from text files

This article will explain how to use Java to read content from a text file and remove punctuation marks. We will use the Java NIO library to read files efficiently and use regular expressions to accurately remove punctuation. Through this article, you will learn to process text files, master the basic applications of regular expressions, and understand best practices for exception handling.

Sep 07, 2025 am 10:24 AM

JSON input verification guide based on OpenAPI/Swagger Schema

This article aims to provide developers with a set of methods for directly verifying JSON input based on OpenAPI/Swagger Schema to replace the traditional Java POJO verification model. The article will introduce the core concepts of OpenAPI specifications and recommend the use of professional tools such as openapi4j to parse and verify Schema, thereby improving the accuracy and development efficiency of API data interaction.

Sep 07, 2025 am 10:18 AM

Detailed explanation of the initialization order of Java class members

This article explores the initialization order of Java class member variables in detail, revealing the mechanism in which member variables are initialized in the declared order during class loading. By analyzing a specific example, it clarifies the reasons why calling a method when member variables are initialized can lead to unexpected results, and provides suggestions to avoid such problems.

Sep 07, 2025 am 10:15 AM

Guide to Implementing the Precision Number of Specified Ranges and Result Array Encapsulation

This tutorial is intended to guide readers how to efficiently find prime numbers in Java in a specified range and collect them into an integer array to return. We will introduce in detail the implementation of isPrime, as well as how to use ArrayList to dynamically collect prime numbers and ultimately convert them into a fixed-size int array. The article will also emphasize best practices for separating business logic from output operations between different classes to ensure the modularity and maintainability of the code.

Sep 07, 2025 am 10:06 AM

Java applications and their dependencies on server deployment strategies and best practices

This article explores the efficient deployment strategies of Java applications and their external dependencies on the server. We will introduce three main methods in detail: creating self-contained ZIP distribution packages, utilizing framework-specific packaging specifications such as WAR files, and using JPackage tools to generate native installation packages. The article aims to provide a safe, maintainable, and easy to upgrade deployment solution, and emphasizes the importance of dependency management and automated deployment.

Sep 07, 2025 am 10:03 AM

Get the current Locale in Android application and implement language-specific logic

This tutorial will guide developers how to accurately obtain the current Locale value after setting the language through the setLocale() function in Android applications. The article elaborates on how to obtain Locale and provides example code and best practices to use this value to implement language-specific data loading or business logic, helping developers build multilingual supported applications.

Sep 07, 2025 am 09:51 AM

Generate titles that accurately express the subject of the article Solution to the problem that the file cannot be found in Java JUnit test

This article aims to solve the common problem of reporting "file not found" in Java JUnit tests, even if the file actually exists. The article will explore the working directory issues in the JUnit test environment and provide a solution to modify the settings.json file to adjust the working directory to ensure that the test can correctly access file resources in the project.

Sep 07, 2025 am 09:45 AM

Databases used by Netbox: PostgreSQL Database Integration Guide

This document describes the types of databases used by Netbox and how to connect to Netbox's PostgreSQL database through Java for transactional operations. We will dive into the Netbox database structure and provide the necessary steps and considerations to help you achieve seamless integration with your Netbox database to ensure data consistency and reliability.

Sep 07, 2025 am 09:33 AM

Negative value processing in Java geometric calculations: throw exception gracefully

This article aims to introduce how to process negative inputs in Java geometry calculations, and ensure the robustness and reliability of the program by adding negative value checks to the method of calculating circle area, rectangle area and triangle area, and throwing an IllegalArgumentException exception when a negative value is detected.

Sep 07, 2025 am 09:15 AM

Tutorial on sorting ArrayList based on frequency

This article describes how to sort the string ArrayList based on the value of another ArrayList (frequency list). By using Java 8's Stream API and Comparator, we can create an index list, sort it according to the value of the frequency list, and then extract elements from the string list using the sorted index, thus achieving the purpose of sorting the string ArrayList based on frequency.

Sep 07, 2025 am 09:12 AM

Java salary calculator: Using a loop to process multiple employee salary

This tutorial details how to use the for loop in Java to calculate salary for multiple employees, including base salary and overtime pay. With an actual salary calculator example, we will learn how to structure code to handle repetitive tasks, correctly implement overtime salary logic, and format output using System.out.printf to improve code readability and reusability.

Sep 07, 2025 am 08:33 AM

Correct way to use Try-Catch blocks and loops in Java

This article aims to illustrate how exception handling affects the execution flow of a loop when the try-catch block is used in Java programming. By analyzing an example of a car rental service, the difference between placing a try-catch block outside and inside the loop is explained in detail, and the correct code structure is provided to ensure that the program can continue to execute when an exception is encountered.

Sep 07, 2025 am 07:06 AM