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Technical Articles

Java

Java Image Pixel ARGB Value Decoding: Bit Operation and Best Practices

This article explores in-depth common problems encountered when decoding image pixel ARGB values in Java, especially color distortion due to incorrect displacement operations. The article details how to ensure the correct combination of ARGB components through bitmasks, and recommends the use of the java.awt.Color class to simplify operations, and optimizes the calculation logic of pixel coordinates, aiming to help developers process image data accurately and efficiently.

Aug 19, 2025 am 09:42 AM

How to check if Spark Row or Row.schema 'contains' a field name?

This article describes how to check if a Row object's schema contains a specific field name in Spark. Through the exists method and getFieldIndex method of the StructType class, you can effectively determine whether the field exists. At the same time, it is also mentioned that fields() and fieldNames() methods are accessed to meet more complex scenario needs.

Aug 19, 2025 am 09:39 AM

Android Scoped Storage: How to read files in specific folders with external storage

This document is intended to guide developers how to use the Storage Access Framework (SAF) to read files in a specific folder of external storage in the Android Scoped Storage environment. We will provide detailed code examples and steps to help you understand how SAF works and access required files safely and efficiently.

Aug 18, 2025 pm 01:03 PM

Avoid repeated consumption of Java Stream: Strategies for efficiently filtering Map

This article aims to solve the problem that Java Stream is commonly used in multiple filtering scenarios, that is, the problem that streams are repeatedly consumed. We will dig into the single use features of Java Stream and provide an efficient and best practice-compliant solution to optimize the filtering operation of the Map by converting external filter conditions into collections, avoiding runtime errors and improving performance.

Aug 18, 2025 pm 12:54 PM

How to write a program that outputs prompts from user input?

This article aims to guide readers to write a Java program that can receive numbers entered by users and determine whether the number is between 30 and 70. If the number is not within this range, the program prompts the user to re-enter until a valid number is entered. This article will introduce in detail how to use the Scanner class to obtain user input and use a while loop to implement the function of repeated prompts, while avoiding common resource leakage problems.

Aug 18, 2025 pm 12:36 PM

The correct posture for dynamically loading Spring Beans

This article aims to solve the problem of dynamic loading of different bean implementations in Spring applications according to the operating environment. By using @Conditional annotation and manually creating beans, you can elegantly implement environment-based bean dynamic loading, avoiding the problem of Spring's inability to distinguish multiple beans that implement the same interface, and providing clear configuration and easy-to-test solutions.

Aug 18, 2025 pm 12:33 PM

Tutorial for converting Android views into pictures and sharing

This tutorial is designed to guide developers on how to convert specific views into images in Android applications and implement the function of sharing the image through applications such as WhatsApp, Skype, and Mail. The article will provide detailed code examples covering implementation methods on Android 6 to Android 10 devices, and includes necessary permission configuration instructions to help developers quickly integrate image sharing functions.

Aug 18, 2025 pm 12:18 PM

Passing variables across Scenario in Cucumber: a not recommended but feasible solution

This article explores the need to pass variables across Scenario in Cucumber tests and provides an implementation method using global variables. While this approach is feasible, it is highly recommended to avoid it as it undermines Scenario’s independence. This article also describes better practices for using Background to initialize shared states to ensure the reliability and maintainability of tests.

Aug 18, 2025 am 11:54 AM

Use Mockito to simulate the correct posture of WebClient requests

This article aims to resolve mock failure issues encountered when using Mockito to simulate WebClient requests. By analyzing the root causes of the problem, we provide viable solutions, including how to properly mock WebClient and how to avoid common mistakes. At the same time, this article also provides code examples to help readers better understand and apply these techniques, thereby writing high-quality unit tests.

Aug 18, 2025 am 11:45 AM

How to swap two numbers without a third variable in Java

Use addition and subtraction: implement exchange through a=a b;b=a-b;a=a-b, which is simple but may overflow in integers; 2. Use multiplication and division: exchange through a=a*b;b=a/b;a=a/b, but cannot handle zero and is prone to overflow, which is not recommended; 3. Use XOR: exchange through a=a^b;b=a^b;a=a^b, which has no overflow risk, and is only applicable to integers, which is efficient and safe, and is the recommended method.

Aug 18, 2025 am 11:38 AM

SmallRye Mutiny Subscribe to unresponsive problems when processing events asynchronously

This article aims to address the issue where subscribers cannot receive events when using SmallRye Mutiny to handle asynchronous event streams. By analyzing the backpressure mechanism, two solutions are provided for manual requesting data and using the cleaner API provided by Mutiny, and are accompanied by code examples to help developers handle event streams correctly asynchronously.

Aug 18, 2025 am 11:27 AM

Maven project dependency version unification: mastering the essence of dependencyManagement

In Maven parent-child projects, implementing unified management of dependent versions and allowing submodules to omit version declarations is the key to improving project maintainability. This article will explore in-depth how to achieve this through tags in the parent POM, thereby avoiding repeated dependent versions in multiple submodules, ensuring consistency in project dependencies, and simplifying the version upgrade process.

Aug 18, 2025 am 11:24 AM

Initialize and call Kotlin ViewModel (including Hilt integration) in Java code

This article explains in detail how to effectively initialize and call an Android ViewModel written on Kotlin in Java code, especially when the ViewModel uses Hilt for dependency injection. We will explore key annotations such as @AndroidEntryPoint and @HiltViewModel, and how to use ViewModelProvider to get ViewModel instances and call their methods from Java Activity to ensure smooth integration of cross-language development with correct lifecycle management.

Aug 18, 2025 am 11:21 AM

How to create a REST API in Java

Create a project using SpringInitializr and add SpringWeb dependencies; 2. Create a User model class to define the data structure; 3. Create a UserController class to implement the GET, POST, PUT, and DELETE interfaces using @RestController and @RequestMapping annotations; 4. Run the main application class to start the embedded Tomcat server; 5. Test the API endpoint through curl or Postman. The complete steps show how to quickly build RESTAPI in SpringBoot, the framework automatically handles configuration and server management, developers only need to pay attention to business logic, and finally implement a runnable basis.

Aug 18, 2025 am 11:17 AM