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Technical Articles

Java

Create Java objects containing list objects: Avoid null pointers and use empty list initialization

This article aims to solve the problem that when creating a class containing a list object in Java, the list attribute defaults to null. Two main methods, including initializing the list in the constructor and setting default values ??in the class definition, explain in detail how to ensure that the list attribute is an empty list rather than null when the object is created, thereby avoiding potential null pointer exceptions. At the same time, developers are also reminded to deeply understand their behavior when using code generation tools such as Lombok.

Sep 16, 2025 am 01:54 AM

How to parse command-line arguments in a Java application?

Javalacksbuilt-inargumentparsing;usemain(String[]args)forbasichandlingorlibrarieslikeApacheCommonsCLIorPicocliforadvancedfeatures.1.Rawargsparsinginvolvesmanualloopandindextracking.2.ApacheCommonsCLIoffersstructuredoptiondeclarationandvalueretrieval.

Sep 16, 2025 am 01:09 AM

Instantiate generic DAO classes using reflection

This article explores the problems encountered when instantiating generic DAO classes using reflection and explains why it is not feasible to instantiate generic DAO classes directly through Class. The article explains the concept of generic type erasing and provides alternatives, including the use of factory patterns or dependency injection frameworks to solve the problem of missing type information at runtime and ensure the correct functionality and type safety of the DAO layer.

Sep 16, 2025 am 12:33 AM

Fix loop interrupt exception in Java Craps game: A tutorial

This article aims to solve the problem of throwing exceptions when loop interrupts in Java Craps games. By analyzing the code, we found that the problem is not in the loop interrupt logic itself, but in the System.out.printf formatted output statement. We will provide a fixed code example and explain how to format the output percentage correctly while ensuring that the game loop exits normally when the conditions are met.

Sep 15, 2025 pm 01:18 PM

Time processing best practices: Time synchronization strategy between UI and backend

This article explores the best practices for temporal data interaction between UI and the backend in web applications. The core is to recommend the use of UTC as a common standard for time storage and exchange, and it is converted to a specific time zone only if the user interface display and specific business logic are required (such as America/New_York). Through classes such as java.time.Instant and java.time.ZonedDateTime, you can manage and convert time more effectively to avoid potential problems caused by time zone differences.

Sep 15, 2025 pm 12:57 PM

Efficient query and aggregation strategy for deep nested arrays in MongoDB

This article explores the complexity and solutions of querying documents with multi-layer nested arrays in MongoDB. We will focus on how to use the aggregation framework, especially operators such as $map, $reduce, $size, and $expr to efficiently determine whether there are non-empty lists or specific elements in deep nested arrays, and provide detailed code examples and professional guidance.

Sep 15, 2025 pm 12:42 PM

Read strings in Java and divide them and assign them to a two-dimensional array

This article aims to guide readers how to use Java to read strings containing space-separated values ??and divide them and assign them to a two-dimensional array. The focus is on how to correctly initialize the dimensions of a two-dimensional array, and how to use the Scanner class to efficiently read and process input data, avoid unnecessary string operations, and ultimately realize the accurate storage of the data in the file into the two-dimensional array.

Sep 15, 2025 pm 12:33 PM

Spring Boot 2.x Multi-Data Source Integration P6Spy Detailed Tutorial

This article aims to resolve issues in Spring Boot 2.x projects that configure multiple data sources and integrate P6Spy to monitor SQL execution. We will explore how to properly configure P6Spy to avoid common IllegalArgumentException and P6DataSource-related errors, and ultimately implement monitoring of SQL statements from multiple data sources.

Sep 15, 2025 pm 12:27 PM

State and capital management of 2D arrays in Java: sorting, user input and verification tutorial

This tutorial details how to use a two-dimensional array to store data from US states and their capitals in Java. The content covers the initialization of two-dimensional arrays, traversal display, bubble sorting implementation based on capital name, user input acquisition, and case-insensitive verification of user input, and counting the number of correct answers. Through specific code examples, help readers master the core skills of processing structured data, sorting algorithms, and interactive program development.

Sep 15, 2025 pm 12:21 PM

Spring Boot Condition Bean Loading Detailed Explanation

This article aims to solve the problem of conditional loading beans in Spring Boot projects. Through the @ConditionalOnProperty annotation, you can decide whether to load a specific bean based on the property values ??of the configuration file. We will provide a complete example showing how to dynamically load different Component configurations based on the use property in the application.yml configuration file and ensure that only beans that meet the criteria are instantiated and injected.

Sep 15, 2025 am 11:54 AM

Efficiently find the maximum and minimum values ??in user input sequences in Java

This tutorial explains in detail how to accurately find the maximum and minimum values ??from a series of integers entered by the user through a loop structure in Java. The article analyzes common programming pitfalls, emphasizes the key to variable initialization and comparison logic within loops, and provides an optimized and robust solution designed to help developers write efficient and correct numerical processing programs.

Sep 15, 2025 am 11:27 AM

Send email speed optimization: Spring Boot's Practical Guide to Integrating AWS SES

This article provides a solution based on the AWS Java SDK V2 version for the mail sending speed bottleneck encountered when Spring Boot applications integrate AWS SES services. By using `SesClient` and referring to the examples in the official AWS code base, developers can significantly improve email delivery efficiency and avoid performance issues caused by using outdated APIs or third-party libraries. This article will introduce in detail how to configure and use `SesClient` and provide relevant code examples to help developers build efficient and stable mail delivery services.

Sep 15, 2025 am 11:24 AM

Transitive dependency exclusion and version management in Gradle multi-module project

This article aims to resolve conflict issues caused by the introduction of old repositories in Gradle multi-module projects due to transitive dependencies. We will explore how to identify conflict sources, analyze Gradle's dependency resolution mechanism, and provide a variety of effective strategies, including using exclude declarations, configuring a forced version of resolutionStrategy, and using dependencyInsight tool for in-depth analysis to ensure the correctness and consistency of project dependencies.

Sep 15, 2025 am 11:18 AM

External fact update and conditional reevaluation in Drools rules: Correct use of update() method

When a Drools rule deals with changes in the state of external facts (Fact) state, its conditional part may not be automatically re-evaluated if not explicitly notified. This article will explore the working mechanism of the Drools Rete network in depth, explain why the rule conditions remain old after external facts are updated, and introduce in detail how to force Drools to reevaluate relevant rules through the update() method (including inside the rule and in external Java code), ensuring that the rule logic is synchronized with the latest data state, and providing key considerations.

Sep 15, 2025 am 11:15 AM