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Technical Articles

Java

javaTutorial

How to use sealed classes in Java

SealedclassesinJava,finalizedinJava17,allowcontrolledinheritancebyrestrictingwhichclassescanextendorimplementagivenclassorinterface.1.Todeclareasealedclass,usethesealedkeywordandspecifypermittedsubclasseswithpermits,suchaspublicsealedclassShapepermit

Aug 18, 2025 am 10:36 AM

JavaFX: Controlling the stacking order of shapes—the wonderful use of setViewOrder

This article provides a simple and effective solution to the problem of how to control the stacking order of different shapes in JavaFX. When the expected effect cannot be achieved using the toFront() method, you can try to use the setViewOrder() method to adjust the cascade order of nodes. By setting different setViewOrder values, you can accurately control the display level of nodes in the scene, thereby solving the problem of shape occlusion.

Aug 18, 2025 am 10:33 AM

How to collect all third-party Jar packages used in Maven projects

This article describes how to use the Maven command to quickly collect a list of all third-party Jar packages in a project to better manage and control project dependencies. Through the mvn dependency:build-classpath command, you can obtain a string containing all Jar package paths, which facilitates you to perform subsequent analysis and processing.

Aug 18, 2025 am 10:21 AM

How to find the minimum value in a List in Java

UseCollections.min()forsimple,readablecodewithComparabletypes,butnoteitthrowsanexceptionifthelistisempty.2.Usestream().min()forfunctionalstyleandsafehandlingofemptylistsviaOptional,idealwithcustomlogic.3.Useamanualloopwhenyouneedfullcontrol,suchasski

Aug 18, 2025 am 09:50 AM

Remove the first instance of the specified class from Java ArrayList

This article aims to provide an efficient and secure way to remove the first instance of a specific class from an ArrayList in Java. By using the instanceof keyword, we can avoid creating unnecessary temporary objects and ensure the robustness and maintainability of our code while taking into account performance. This article will provide detailed sample code and considerations to help developers better understand and apply the method.

Aug 18, 2025 am 09:48 AM

How to Mock Java WebClient for unit testing

This article aims to resolve the problem that Mock does not take effect in Java WebClient unit tests. By analyzing common causes of errors, a solution is provided to build WebClient through Mockable methods, and points out the need for the use of the Mockito eq() method to help developers write reliable WebClient unit tests.

Aug 18, 2025 am 09:39 AM

File upload test passed locally but failed on Jenkins

This article provides a file path-based solution for the problem that file upload tests passed in the local environment but failed in the Jenkins integrated environment. By analyzing Jenkins' working directory structure and combining error log information, it helps readers locate problems and provides a convenient way to store and access files, ensuring that file upload tests can be executed smoothly on Jenkins.

Aug 18, 2025 am 09:33 AM

What is abstraction in Java?

AbstractioninJavaisafundamentalconceptofobject-orientedprogramming(OOP)thatfocusesonhidingtheinternaldetailsofhowanobjectworksandshowingonlytheessentialfeaturestotheuser.Insimpleterms,it’saboutexposingwhatanobjectd

Aug 18, 2025 am 09:29 AM

Java implements Google Map route navigation: build and automatically open through URL

This tutorial will explain in detail how to use the Java programming language to build a specific Google map URL, and automatically open and display route navigation from the start point to the end point in the browser. The article covers URL structure, Java code implementation, methods for handling the user's current location as the starting point, as well as key considerations such as URL encoding and error handling, aiming to provide a simple and efficient solution.

Aug 18, 2025 am 09:06 AM

Elasticsearch Solutions for not being able to use alphanumeric mixed search

This article aims to solve the problem that searches cannot be done with alphanumeric mixed strings in Elasticsearch. Usually, this is due to the use of an inappropriate analyzer that removes the numbers during the indexing process. This article will explain how to solve this problem by selecting the right Tokenizer, such as edge-gram or standard analyzer, to enable an efficient search of alphanumeric mixed strings.

Aug 18, 2025 am 09:03 AM

How to check if Spark Row or Row.schema 'Include' field names?

This article describes several ways to check if Row or Row.schema contains a specific field name in Spark. Through the exists method and the getFieldIndex method, developers can easily determine whether the field exists in the schema and choose the most suitable method according to their needs. In addition, you can directly access fields() and fieldNames() arrays for more flexible processing.

Aug 18, 2025 am 09:00 AM

what is a palindrome and how to check for it in java

To check palindrome, you need to standardize the input and compare whether the forward and reverse order is consistent. Common methods include using StringBuilder to invert strings or double pointer method; for numbers, you can judge by inverting numbers comparison. The StringBuilder method is concise and easy to read, and the double pointer method saves space and is suitable for palindrome detection in different scenarios.

Aug 18, 2025 am 08:55 AM

Java implements random upper case letter combination generation

This tutorial details how to generate a specified number of random case Latin combinations in Java. By using the Math.random() method to generate random numbers and combine the ASCII code characteristics of characters, we will demonstrate how to efficiently convert these random numbers into required letters, and provide complete code examples and implementation parsing to help readers master the core skills of random character generation.

Aug 18, 2025 am 08:45 AM

What are wrapper classes in Java?

WrapperclassesinJavaareneededbecausetheyallowprimitivedatatypestobeusedasobjects,whichisrequiredwhenworkingwithcollections,generics,andAPIsthatexpectobjects;eachprimitivetypehasacorrespondingwrapperclass—suchasIntegerforintandBooleanforboolean—enabli

Aug 18, 2025 am 08:39 AM

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