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Technical Articles

Java

javaTutorial

Null value processing and exception throwing strategies for responsive streams in Spring WebFlux

This article explores the challenges posed by handling null values ??in Spring WebFlux responsive programming and provides two robust solutions. According to the Reactive Streams specification, responsive sequences do not allow null elements, so it is not advisable to return null directly in map operations. We will explain in detail how to use flatMap and handle operators to gracefully throw custom exceptions when null values ??are detected to ensure the correctness and stability of the responsive stream.

Sep 06, 2025 am 09:15 AM

Reference behavior and defensive copying practice of array members in Java objects

This article explores the common reference behavior traps in Java when using arrays as object members. When an external array is assigned directly to an array reference inside an object, the two will point to the same piece of data in memory, causing external modifications or internal modifications to the object to affect each other. To avoid this unexpected side effect, the tutorial will explain in detail the impact of Java's "value delivery" mechanism on object references, and provide a solution for defensive copying using Arrays.copyOf() to ensure the independence and encapsulation of the internal state of the object.

Sep 06, 2025 am 09:12 AM

Hibernate @OneToOne Lazy Loading Problems and Solutions in Bidirectional Association

This article deeply explores the problem of delayed load failure in the @OneToOne bidirectional association in Hibernate. By analyzing the problem code, the reason why @OneToOne's default behavior does not match expectations is explained, and two solutions are provided: remove the Passport association in the Person entity, or use the @MapsId annotation. At the same time, for the two usage scenarios of Spring JPA and EntityManager, corresponding code examples are given to help developers better understand and solve this problem.

Sep 06, 2025 am 09:06 AM

Implement favorites: Use LocalStorage to add cards to favorites page

This article describes how to use JavaScript and LocalStorage to implement collection functionality on web pages. Users can add cards from the main page to a separate favorite page and view favorites on the favorites page. The article provides detailed code examples that demonstrate how to store card data to LocalStorage and how to read and display it on a favorite page. Through this article, readers can master the methods of using LocalStorage to implement simple collection functions and apply them to their own projects.

Sep 06, 2025 am 09:03 AM

Java high-concurrency database synchronization processing: efficient task scheduling and connection management practices

This article discusses in-depth strategies for handling massive data concurrent synchronization in Java applications. By encapsulating database operations into independent tasks, efficient scheduling is carried out in combination with ExecutorService, and optimizing resource management with database connection pools (such as HikariCP), it emphasizes the importance of database-level transactions and lock mechanisms. The article provides professional guides for implementing concurrent processing, marking consumer rows, and ensuring high performance and data consistency in the system.

Sep 06, 2025 am 08:54 AM

Get and use the current Locale to make multilingual condition judgment in Android applications

This article explains in detail how to accurately obtain the currently effective Locale information in Android applications after setting the language through the setLocale() function, and implement the language-related conditional judgment logic based on this. The article provides sample code for obtaining Locale and discusses more robust strategies for data or UI adaptation in multilingual scenarios, aiming to help developers build robust and adaptable multilingual applications.

Sep 06, 2025 am 08:42 AM

ArrayList reference delivery problem and solution in Java

When passing variable collections such as ArrayList to objects in Java, if you do not create a new instance and only clear and reuse the original collection, all objects referencing the collection will share the same data, resulting in subsequent modifications affecting the stored data. This article will parse this reference pass trap in detail and provide a solution to ensure data independence by instantiating the new ArrayList to avoid unexpected data string changes.

Sep 06, 2025 am 08:27 AM

Combining JSONArray based on shared keys in Java: Building a unified data view

This article will introduce in detail how to efficiently merge JSONObjects in multiple JSONArrays based on a shared key (such as id) in Java, and finally generate a JSONArray containing integrated data. We will use sample code to demonstrate how to use HashMap as intermediate storage to implement data association and combination, and discuss key considerations in the merge process to help developers build clear and consistent JSON data structures.

Sep 06, 2025 am 08:09 AM

Tutorial on efficiently checking whether a byte array nibble (Nibble) exceeds the limit in Java

This tutorial explores how to efficiently check whether each nibble in a byte array is greater than 9 in Java. By utilizing bit operations, string conversion or complex arithmetic operations can be avoided, thereby significantly improving performance and ensuring data compliance, especially for processing data in hexadecimal representations.

Sep 06, 2025 am 07:18 AM

Gradle multi-module project dependency configuration guide: Solve the problem of dependency not found between subprojects

This article discusses in-depth common problems in the inability to resolve dependencies between subprojects in Gradle multi-module project configuration. By parsing the root cause of the error in detail - the subproject has an independent settings.gradle file and provides the correct Gradle multi-module project structure and configuration examples, aiming to help developers build clear, maintainable and complex projects to ensure the correct identification and management of inter-project dependencies.

Sep 06, 2025 am 06:57 AM

Java text file stop word removal and word frequency statistics tutorial

This article details how to implement the stop word removal and word frequency statistics functions of text files in Java. The tutorial covers file reading, construction of stop word lists, text cleaning (including case conversion and punctuation processing), efficient word segmentation removal, and the complete process of using HashMap for word frequency statistics and sorting to output Top N high-frequency words.

Sep 06, 2025 am 06:09 AM

Verify Executor internal method calls using Mockito

This article describes how to verify methods called inside the Executor.execute() method when using Mockito for unit testing. Because Executors usually perform tasks asynchronously, direct verification may fail. This article provides a solution to force synchronization execution using SynchronousExecutor, simplifying testing and ensuring method calls can be validated correctly.

Sep 06, 2025 am 05:57 AM

Find objects in ArrayList in Java

This article aims to guide developers how to find specific objects based on their attribute values ??in Java's ArrayList. The contains() method of ArrayList can only find exactly matching objects by default, and cannot be directly searched through some properties of the object. This article will introduce how to implement object search based on attribute values ??by looping through and overwriting the equals() method, and provide sample code and precautions.

Sep 06, 2025 am 05:48 AM

Logback log control: Disable console output while retaining file records

This article aims to solve the problem that Logback still outputs to the console when the ConsoleAppender is not explicitly configured. We will explore Logback's log additionity mechanism in depth, and use specific Java code examples to demonstrate how to accurately control the propagation of log events by setting logger.setAdditive(false), so as to only write logs to the specified file and stop unnecessary console output.

Sep 06, 2025 am 05:18 AM