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Technical Articles

Java

javaTutorial

Android development: Tutorial on implementing list string segmentation and word rearrangement

This tutorial is designed to guide Android developers how to efficiently extract sentences from a custom object list and perform word segmentation and random rearrangement of each sentence. The article will introduce the core traversal and string processing logic in detail, combine Java's collection operations to achieve word shuffling function, and provide practical code examples and best practices for building interactive learning applications (such as word sorting questions), ensuring that the logic is clear and easy to expand.

Sep 08, 2025 am 09:48 AM

MongoDB query deep nested array: determine whether multi-layer subarray contains elements

This tutorial explores in-depth how to efficiently query documents containing multi-layer nested arrays in MongoDB. We will use a concrete aggregation pipeline example to demonstrate how to determine whether any deeply nested subarrays in a document, such as smartFlowIdList, contain at least one element, thus solving complex data structure query challenges.

Sep 08, 2025 am 09:39 AM

Traps and circular dependency solutions for this reference in Java constructor

In Java inheritance system, the subclass constructor cannot refer to this before calling super() because the object has not been fully initialized. When the parent class constructor requires a subclass instance (this) as a parameter, and the subclass needs to pass this to its internal dependencies (such as ParameterData), a compilation error of "cannot refer to 'this' before calling the superclass constructor". This article will analyze the causes of this problem in depth and provide solutions to break this circular dependency by delaying the initialization of non-final fields, ensuring the correctness and consistency of objects during the construction process.

Sep 08, 2025 am 09:27 AM

Use constructor injection instead @Autowired annotation: Spring Boot best practices

This article aims to help developers understand how to replace @Autowired annotation through constructor injection in Spring Boot projects, thereby improving the testability of code and clarity of dependency management. We will go into detail about how to simplify constructor injection using Lombok's @AllArgsConstructor annotation, and explore the necessary steps to properly register beans in Spring containers to avoid common configuration errors.

Sep 08, 2025 am 09:15 AM

Embed class in Hibernate cannot override the 'mappedBy' attribute

This article discusses the question of whether the mappedBy property can be overridden when using an embedded class (Embeddable) in Hibernate. Conclusion is that according to the JPA specification, the mappedBy attribute of a one-to-many relationship cannot be used inside an embedded class. The article will explain the reasons for this limitation in detail and provide alternative thinking directions.

Sep 08, 2025 am 09:12 AM

Docker deployment guide for Quarkus application on Render.com

This article aims to resolve build failures encountered when deploying a Quarkus Java application to Render.com via Docker. The core content is to adopt a multi-stage Dockerfile strategy to ensure that application compilation is completed inside the container and only the products required at runtime are packaged into the final image, while emphasizing the importance of .dockerignore file configuration to enable efficient and reliable cloud platform deployment.

Sep 08, 2025 am 09:03 AM

Hibernate @OneToOne Detailed explanation of the problem of delayed load failure in two-way association

This article aims to deeply explore the problem of latent loading (FetchType.LAZY) failure under the @OneToOne bidirectional association in Hibernate and provide a solution. We will analyze the causes of this phenomenon and combine the sample code to show how to properly configure the @OneToOne association for real lazy loading, thereby optimizing database query performance.

Sep 08, 2025 am 07:39 AM

Application of Java loop structure in salary calculator

This article will guide you how to use the for loop structure in Java to efficiently calculate wages for multiple employees and correctly handle overtime pay. By encapsulating the input acquisition and salary calculation logic in a loop, the program can automatically iterate over each employee's data, implement clear structure and easy to expand batch computing functions, and use formatted output to improve the user experience.

Sep 08, 2025 am 07:24 AM

How to share images to Adobe Lightroom in Android app

This article describes how to use Kotlin code to share images in Android applications directly to the Adobe Lightroom application. By building an Intent with an image URI and specifying the target application package name, you can seamlessly jump from your application to Lightroom for image editing.

Sep 08, 2025 am 06:42 AM

Struts 2 and AJAX's JSON response problem troubleshooting and solving

This article aims to resolve the parsing error problem encountered when using AJAX to obtain JSON responses under the Struts 2 framework. By analyzing common configuration and code issues, a solution is provided to use Map structures as Action return values, avoiding potential problems caused by manual write responses and ensuring that AJAX parses JSON data correctly.

Sep 08, 2025 am 06:30 AM

Build robust Java user input: Scanner integer parsing and exception capture

This article explores in-depth InputMismatchException that Java Scanner may raise when the user enters non-integer data when obtaining integer input. We will explain the mechanism of generating this exception and provide a robust solution: by combining the try-catch statement to effectively catch and handle the exception, thereby avoiding program crashes and improving the stability and friendliness of user interaction.

Sep 08, 2025 am 05:39 AM

Optimizing Java application memory: Strategies and practices for handling large data sets

This article discusses how to effectively avoid memory overflow (OutOfMemoryError) when processing large data sets in Java applications. By analyzing the garbage collection challenges that iterative batch processing may encounter, and introducing optimization solutions for database batch queries (IN clauses), emphasizing the response strategies when the total amount of data exceeds the JVM memory limit, aiming to provide a set of clear structure and practical memory management guidelines.

Sep 08, 2025 am 05:00 AM

Use regular expressions to determine whether there are duplicate characters in a string

This article introduces how to use Java regular expressions to determine whether a fixed-length string contains duplicate characters. The core idea is to use reverse matching, that is, to find a string containing duplicate characters, and then determine whether the target string does not match the expression. The article will provide detailed regular expressions and provide Java code examples to help readers understand and apply the method.

Sep 08, 2025 am 04:48 AM

Retry strategy and implementation of deserialization exceptions in Kafka batch listener

This article details how to effectively handle and retry deserialization exceptions in Spring Kafka batch listener. By modifying the DefaultErrorHandler to cancel the fatal marking of DeserializationException, and combining the listener's internal exception information extraction and retweeting of messages with null payloads, retrying the entire batch of messages is achieved, thereby improving the robustness of Kafka applications.

Sep 08, 2025 am 04:27 AM