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Technical Articles

Java

javaTutorial

Android PeriodicWorkRequest Troubleshooting and Optimization

Android's WorkManager component is designed to simplify the scheduling and execution of backend tasks. However, when using PeriodicWorkRequest, developers may experience issues where the task stops running after a period of time. This article will explore in-depth the reasons for this phenomenon, especially the Doze mode of Android system, and provide corresponding troubleshooting and optimization suggestions to ensure the stable operation of PeriodicWorkRequest.

Sep 09, 2025 am 10:48 AM

Detailed explanation of Jackson JSON attribute serialization: annotation usage and best practices

This article deeply analyzes the mechanisms of JSON attribute serialization and deserialization in the Jackson library, and focuses on explaining the usage methods of annotations such as @JsonAlias, @JsonGetter, @JsonProperty, etc., and combines actual cases to help developers understand how Jackson handles JSON attribute names according to JavaBeans conventions and annotations, avoids common configuration errors, and implements flexible and efficient JSON data binding.

Sep 09, 2025 am 10:09 AM

Setting the relative path of Apache FOP fonts: Use fop.xconf to configure cross-platform fonts

When Apache FOP configures fonts under different operating systems, you will encounter compatibility issues when using absolute paths. This article details how to use tags and relative embed-url attributes in fop.xconf to flexibly specify the relative path of the font file, ensuring that the application can correctly load and render fonts in multiple environments, avoid hard-coded paths, and improve portability.

Sep 09, 2025 am 09:33 AM

Java method analysis mechanism: upward transformation, overloading and variable parameters interaction

This article deeply explores the complex interaction between upward transformation, method overloading and Varargs method analysis in Java. Through specific examples, it explains how the compiler selects the called method based on the reference type rather than the actual object type in the upward transformation scenario, especially when the parent class contains mutable parameter methods and the subclass has ordinary methods, how the compile-time binding behavior causes the parent class method to be executed, revealing the compile-time characteristics of Java method overload parsing.

Sep 09, 2025 am 09:27 AM

Android ScrollView Large-scale image view performance optimization: layout selection and hierarchy simplification

This tutorial explores performance bottlenecks when loading large quantities of ImageViews or ImageButtons in an Android ScrollView. In view of the poor performance of TableLayout and GridLayout, the article recommends using ConstraintLayout as an efficient layout solution. Core optimization strategies include choosing the right layout manager and avoiding over-necking of view hierarchies to significantly improve application startup speed and user experience. By simplifying the view structure, the time-consuming of the onMeasure method can be effectively reduced, thereby achieving smoother interface rendering.

Sep 09, 2025 am 09:09 AM

Get the value of LinkedHashMap by index? Solutions and Best Practices

This article aims to solve the problem of how to compare values ??with the same key (chargeTypeName) in two LinkedHashMaps. Since LinkedHashMap itself does not support direct access through indexes, the article will explore how to use technologies such as Stream and Grouping to effectively find out the same value pairs in two LinkedHashMaps and perform subsequent operations.

Sep 09, 2025 am 09:06 AM

Optimized quick sorting: Solve large-scale array stack overflow problem

This article aims to solve the stack overflow problem encountered when using quick sorting to handle large arrays. By analyzing the limitations of traditional recursive implementations, especially the risk that it may lead to too deep recursive stacks in the worst case, we propose an optimization strategy combining iteration and recursive. This method recursives smaller partitions through intelligent selection and iterative processing of larger partitions, effectively limiting the maximum recursion depth to O(log n), thereby avoiding stack overflow and improving the robustness of the algorithm.

Sep 09, 2025 am 09:03 AM

Minecraft Forge 1.12.2 Custom Player Model Replacement Tutorial

This tutorial aims to solve the technical challenge of replacing the player's default model with BlockBench custom model in Minecraft Forge 1.12.2. The article first analyzes the common NullPointerException problem in manual rendering replacement, pointing out its root cause and manual implementation complexity. Subsequently, GeckoLib, a powerful animation model library, was highlighted and outlined as a professional solution to simplify custom model integration, especially the rendering of complex animation entities. The tutorial will guide readers to understand the advantages of GeckoLib, basic integration ideas and precautions when handling custom models, so as to improve the efficiency and stability of module development.

Sep 09, 2025 am 08:57 AM

How to save dynamically created checkbox status in Android

This article describes how to save the status of dynamically created check boxes in Android apps so that the selected status of the check box remains unchanged after the user reopens the app or interface. We will explore ways to use SharedPreferences to persist checkbox states and provide sample code to help you understand and implement.

Sep 09, 2025 am 08:48 AM

Java implements the list uniform blocking strategy: benchmark Numpy array_split

This article explores how to evenly split a list (or array) into a specified number of sublists in Java to simulate the behavior of the array_split function in the Python NumPy library. We will introduce an implementation strategy based on the Guava library Lists.partition method, which can accurately calculate the maximum capacity of each sublist to achieve flexible and efficient data chunking processing, suitable for scenarios such as parallel processing or data paging.

Sep 09, 2025 am 08:36 AM

Selection sort: a tutorial to gradually display the results of each iteration

This article will introduce in detail how to display the array status after each iteration is completed in the selection sorting algorithm. By modifying the sorting algorithm, after completing the search and exchange of the minimum value each time, the status of the current array is printed out, thereby clearly observing each step of selecting sorting. This article provides modified code examples and explains how to insert print statements during the sorting process to better understand how select sorting works.

Sep 09, 2025 am 08:24 AM

Solutions that Android Dialog cannot be turned off: Avoid duplicate instance creation

This article provides a common solution to the problem that Dialog cannot be closed normally in Android development. The core of the problem is that new instances are created each time Dialog is displayed and closed, causing the shutdown to act on the undisplayed instance. This problem can be effectively solved by declaring the Dialog instance as a global variable and reuse it when needed. At the same time, moving Dialog's custom settings to the Dialog class can improve the organization and maintainability of the code.

Sep 09, 2025 am 08:18 AM

Logical optimization practice of conditional judgment and message output in Java loop

This article discusses how to avoid duplicate or incorrect feedback information due to improper logical structure when dealing with conditional judgments within loops in Java. By analyzing a real case of vehicle inventory updates, we reveal common pitfalls of putting “not found” messages inside an else block. The article provides two core solutions: using Boolean flags to uniformly judge after the loop ends, and using an early return mechanism when determining that there is only one match, aiming to help developers build more robust and logically clearer programs.

Sep 09, 2025 am 07:57 AM

Efficient conversion of Java strings to Map: a robust solution for handling comma values

This article aims to provide a tutorial on converting strings of specific formats (such as "\"Key\":\"Value\",\"Key2\":\"Value with, comma\"") to Map in Java. We will focus on how to use the String::split method combined with precise separators to effectively handle complex situations where commas are included in values, avoid third-party libraries, and ensure the lightweight and broad applicability of the solution.

Sep 09, 2025 am 07:24 AM