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Technical Articles

Java

Java datetime processing: How to generate independent timestamps for each user input

This tutorial explores in depth how to dynamically generate and print independent date and timestamps for each user input in Java applications. The article first explains the common mistakes made by the old java.util.Date API when getting the latest timestamps in a loop, and shows the correct implementation through code examples. Then, best practices for using modern java.time APIs such as LocalDateTime and DateTimeFormatter to handle dates and time are highlighted, emphasizing its superiority in design and functionality, helping developers write more robust and precise time processing logic.

Sep 08, 2025 am 11:45 AM

Java collection reference management: a policy to ensure independent internal list status when object creation

This tutorial explores how to avoid unexpected changes to internal data caused by reference sharing when passing sets as parameters to constructors in Java. When multiple objects share the same mutable collection instance and modify the collection externally, all objects referencing the collection are affected. The article will detail two effective strategies: creating new collection instances or performing defensive replication, ensuring that each object has an independent and stable internal data state.

Sep 08, 2025 am 11:33 AM

Handling null values ??and throwing exceptions in responsive programming: Spring WebFlux practice

This article aims to explain how to gracefully handle possible null values ??and throw custom exceptions under specific conditions in Spring WebFlux responsive programming. Focus on the usage of flatMap and handle operators, and provide sample code to help developers avoid potential problems caused by null values ??and improve the robustness and maintainability of their code.

Sep 08, 2025 am 11:06 AM

Tutorial on Docker deployment of Quarkus app on Render.com

This article aims to guide developers on how to deploy Quarkus applications on the Render.com platform. In response to the problem that Quarkus' default Dockerfile cannot be directly built in Render, the tutorial explains in detail how to complete application compilation within the container by adopting a multi-stage Docker construction strategy and optimize the .dockerignore configuration. Through this tutorial, you will master the complete process of efficiently and stably deploying Quarkus applications on Render.

Sep 08, 2025 am 10:51 AM

Improper use of Future objects in concurrent programming and solutions

This article analyzes the reasons for the common set is not applicable to arguments (int,int) errors in Java concurrent programming, which are trying to directly assign integer values ??to the sets storing Future objects. The article will elaborate on the characteristics of Future objects and provide the correct solution, including how to initialize data, avoid concurrency problems, and use ExecutorService rationally.

Sep 08, 2025 am 10:48 AM

Initialize members of another class in one class using a method with arguments

This article describes how to initialize member variables of another class in Java by using parameters in a class method. The focus is on understanding the concepts of object instantiation and reference passing, avoiding null pointer exceptions, and providing two different implementation methods, one is to create a new object inside the method, and the other is to pass the object as a parameter.

Sep 08, 2025 am 10:30 AM

Spring Boot Thymeleaf Dynamic Table Rendering and Operation Button Integration Tutorial

This tutorial aims to solve the problem of how to correctly add action buttons (such as delete buttons) to each row of data when rendering dynamic tables using the Thymeleaf template engine in Spring Boot application. We will build a complete example of data model, backend controller and frontend templates to explain in detail how to avoid common loop nesting errors and ensure that each record corresponds to an operation button, thereby achieving clear and fully functional data display and interaction.

Sep 08, 2025 am 10:27 AM

Tutorial on the calculation and application of string Haiming distance in Java

This tutorial explains in detail how to implement Heming distance calculation of strings in Java. The content covers the core Heming distance calculation method, which can process equal length strings and return distances, or return -1 when lengths are inconsistent. In addition, the tutorial also shows how to apply this method in the main program, including getting a string list and target string from user input, calculating distances in batches, and finding the string corresponding to the shortest Heming distance, providing complete code examples and precautions.

Sep 08, 2025 am 10:21 AM

Master Java generic list algorithm: implement multi-type numerical operations

This article discusses the challenges and solutions for writing generic list algorithms that can handle different numeric types (such as Integer, Double) in Java. By leveraging the Java Stream API and type-safe instanceof checking, we show how to gracefully implement arithmetic operations on elements of a generic Number list, while taking into account the immutability advantages of functional programming and the necessary in-situ modification scenarios, and detail the details and potential issues of type conversion.

Sep 08, 2025 am 10:00 AM

Calculate the number of loop iterations and compare iterations in other classes

This article describes how to calculate the number of iterations of a loop in Java and provides a way to encapsulate the calculation results in a custom class to return. In this way, it is easy to compare the number of iterations in different algorithms or classes, thereby evaluating their performance. The article provides an example of calculating polynomials using the Horner method and shows how to create a Result class that contains the result of the calculation and the number of iterations.

Sep 08, 2025 am 09:57 AM

Java generic list algorithm: safe handling of numerical type operations and Stream practice

This article explores the type safety challenges faced when performing arithmetic operations (such as division) on generic Lists in Java. By analyzing the limitations of directly manipulating Number types and using instanceof, the article proposes and elaborates in detail the solution based on the Java Stream API combined with type-specific processing, and provides two implementations of generating new lists and modifying lists in situ, aiming to help developers write robust and efficient generic list algorithms.

Sep 08, 2025 am 09:54 AM

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