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Technical Articles

Java

javaTutorial

A practical guide to converting current time to seconds in Java

This article describes how to convert the current time to seconds calculated from the day in Java and provides sample code using java.time.LocalTime. Avoid using System.currentTimeMillis() directly. It is recommended to use methods such as LocalTime.now().toSecondOfDay() or LocalTime.now().isBefore(target) while taking into account time zone issues to ensure the accuracy and readability of the code.

Aug 21, 2025 am 08:30 AM

Merging string arrays in Java: The correct way to avoid null value issues

This tutorial analyzes in detail the common problem of null values ??in the target array due to improper setting of loop conditions when merging two string arrays in Java. By comparing errors with correct code examples, we have an in-depth analysis of the keys of index management and provide effective solutions to ensure that all elements are merged correctly, aiming to help developers master the correct logic and skills of combining and combining the array.

Aug 21, 2025 am 08:18 AM

What is the difference between constructor injection and setter injection in Java with Spring?

Themaindifferenceisthatconstructorinjectionprovidesdependenciesatobjectcreation,ensuringimmutabilityandrequireddependencies,whilesetterinjectionsetsthemaftercreation,allowingoptionalorchangeabledependenciesbutriskingincompleteobjectstate;constructori

Aug 21, 2025 am 08:11 AM

spring dependency injection

Tutorial on searching prime numbers in specified ranges and returning arrays in Java

This article details how to implement an efficient prime search function in Java, allowing it to recognize all primes in a specified range of integers and encapsulate the result into an integer array to return. The tutorial will step by step guide how to build an isPrime method for prime judgment, and how to use a set (ArrayList) to collect prime numbers and eventually convert it into an array, while highlighting the best practices of separating computational logic and output operations.

Aug 21, 2025 am 07:57 AM

Optimizing nested loops with HashMap: Java object list conversion practice

This article aims to significantly improve the efficiency of Java object list processing by optimizing nested loops using HashMap. We will demonstrate how to convert traditional double loop structures into HashMap-based search methods for scenarios containing nested objects, thereby reducing time complexity and improving program performance. This article will provide detailed code examples and step instructions to help developers understand and apply this optimization technique.

Aug 21, 2025 am 07:48 AM

How to find the first element in a Java Stream

UsefindFirst()togetthefirstelementinaJavaStream,whichreturnsanOptionaltopreventNullPointerException.2.Ensurethestreamhasencounterorder,asunorderedstreams(e.g.,fromHashSet)mayyieldunpredictableresultsunlesssorted()isapplied.3.Combinewithfilter()tofind

Aug 21, 2025 am 07:42 AM

How to synchronize threads in Java

Usethesynchronizedkeywordformethodorblock-levellockingtoensureonlyonethreadaccessescriticalsectionsatatime.2.PreferReentrantLockforadvancedfeaturesliketryLock(),fairness,andinterruptibility,ensuringlockreleasewithtry-finallyblocks.3.Applyvolatileforv

Aug 21, 2025 am 07:39 AM

Java implements checksum calculation of hexadecimal strings

This article details how to calculate the checksum of hexadecimal strings using Java, especially for 58-byte hexadecimal data. The article will explore how to convert hexadecimal strings into byte arrays and provide a variety of checksum calculation methods, including CRC32 algorithms and custom summing methods, to help readers understand and implement the required checksum calculation logic. In addition, the article discusses possible issues and precautions to ensure that readers can apply these technologies correctly.

Aug 21, 2025 am 07:09 AM

What is a Servlet in Java?

JavaServletsareserver-sideJavaclassesthathandleHTTPrequestsandgeneratedynamicwebresponses,formingthefoundationofJavawebapplications;theyaremanagedbycontainerslikeTomcat,followadefinedlifecyclewithinit(),service(),anddestroy()methods,supportHTTPoperat

Aug 21, 2025 am 06:59 AM

java servlet

String inverts and increments characters: Java implementation details

This article will explain in detail how to implement string inversion using Java and increment each character in the string by one. We will provide a complete code example and explain the key steps, including the handling of character ASCII values ??and the handling of special cases (such as 'z' incremented to 'a' and 'Z' incremented to 'A'). Through this article, you will master the core skills of string manipulation and be able to flexibly apply them to actual development.

Aug 21, 2025 am 06:54 AM

Databases used by Netbox: PostgreSQL Connection and Transaction Guide

This article aims to answer the types of databases used by Netbox and provides guidance on transactional operations through Java connection to a Netbox PostgreSQL database. We will explain in detail how to configure the Java environment, establish database connections, and implement transaction control to ensure data consistency and reliability.

Aug 21, 2025 am 06:45 AM

How to use Gradle for dependency management in Java

GradlesimplifiesJavadependencymanagementthroughitsflexibleDSLandefficientdependencyresolution.1.InitializeaJavaprojectusinggradleinitandselecttheappropriateprojecttype.2.ApplytheJavaplugininbuild.gradlewithplugins{id'java'}toenablecoreJavatasks.3.Add

Aug 21, 2025 am 06:39 AM

how to reverse a linked list in java

To reverse the linked list, you should use the iteration method, traverse the linked list through three pointers and reverse the pointer direction one by one, the time complexity is O(n) and the space complexity is O(1); the specific steps are: initialize prev to null, current is head, temporarily store current.next in the loop, point current.next to prev, then move prev and current forward in turn, and finally prev is the new head node. This method is efficient and safe, and is suitable for practical applications.

Aug 21, 2025 am 06:30 AM

Compatibility of using different versions of AspectJ runtime and compile-time weaving code

This article discusses the compatibility issues between the runtime and the compile-time weaving code in the scenario of using AspectJ for compile-time weaving. Particularly concerned is whether it is safe to use higher versions of AspectJ in the runtime environment when the dependency external libraries are compiled-time weaving with lower versions of AspectJ, and the project itself needs to use higher versions of Java and AspectJ for compile-time weaving. The conclusion is that, in general, it is safe to runtime with the latest version of AspectJ and provides relevant reference links.

Aug 21, 2025 am 05:27 AM