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Technical Articles

Java

javaTutorial

Configuring Java 19 preview and incubator features in Gradle project

This article provides detailed instructions on how to enable Java 19 preview (such as virtual threads) and incubator (such as structured concurrency) features in Gradle projects. By configuring compileJava tasks' compiler parameters and application plug-in's JVM startup parameters, developers can seamlessly integrate and experience new features of the Java platform, ensuring that these experimental APIs are correctly identified and used during the compilation and run phases. This will involve setting key command line flags such as --release, --enable-preview, and --add-modules to suit the needs of different stages. This tutorial is designed to provide clear and actionable steps to help you explore Java in a Gradle environment

Sep 04, 2025 am 08:48 AM

How to create a two-dimensional array in Java

There are three main ways to create two-dimensional arrays in Java: 1. Use fixed size and initialize the default value, such as int[][]array=newint[3][4]; to create an array of 3 rows and 4 columns, the elements default to 0; 2. Initialize the specified value directly, such as int[][]array={{1,2,3},{4,5,6},{7,8,9}}; to create a 3x3 two-dimensional array and assign values; 3. Create an irregular (jagged) array, such as int[][]raggedArray={{1,2},{3,4,5,6},{7}};, each row length can be different; elements can be accessed or modified through array[i][j], and use nested for loops or

Sep 04, 2025 am 08:45 AM

Master JUnit 5 Parameterized Test: Efficiently Test Switch-Case Logic and Best Practices

This tutorial explains in detail how to use the @ParameterizedTest annotation of JUnit 5 to efficiently test switch-case logic in Java. The article deeply analyzes the common problems of mixing JUnit 4 and JUnit 5 annotations, emphasizes the importance of separating business logic and I/O operations, and provides clear example code to guide readers how to effectively cover different branches through parameterized testing and dependency injection, improving testing efficiency and code maintainability.

Sep 04, 2025 am 08:33 AM

How to implement rewrite list method in Java gRPC service

This article describes how to override the list method in a Java gRPC service to return an object containing all created entries. By constructing a ListPersonsResponse object and sending a response using the responseObserver.onNext() method, you can easily return the list data without complex stream processing.

Sep 04, 2025 am 08:21 AM

How to use the Spring Framework with Java

StartbysettingupaSpringprojectusingSpringInitializrormanuallywithMaven,2.UnderstandcoreconceptslikedependencyinjectionandcomponentscanningwhereSpringmanagesbeansandtheirdependencies,3.Buildawebapplicationbycreatinga@RestControllerwithendpoints,4.Exte

Sep 04, 2025 am 07:59 AM

High-Performance Java Messaging with RabbitMQ and AMQP

Use the official RabbitMQJava client and reuse connections to avoid sharing channels across threads to improve basic performance; 2. Enable publish confirmation (asynchronous or batch) and set message persistence on demand to balance reliability and throughput; 3. Control the number of prefetches through basicQos and use manual confirmation to avoid message loss to ensure efficient processing of consumers; 4. Configure reasonable heartbeat, low-latency network deployment, enable TLS if necessary and combine SSD and cluster to improve overall stability; 5. Use management interface, Prometheus or stress testing tools to monitor publish/consumption rates, queue length and JVMGC status, and continuously optimize system performance. Java applications by rationally configuring AMQP clients and infrastructure

Sep 04, 2025 am 07:54 AM

java rabbitmq

Sorting arrays of strings based on frequency: Java Tutorial

This article introduces an effective way to sort string arrays based on another array of integers (frequency) in Java. By using IntStream and Comparator, we can create an index stream, sort it according to the value of the frequency array, and then map the original string array using the sorted index to get the desired sorting result. This tutorial provides detailed code examples and explanations to help you understand and apply this technique.

Sep 04, 2025 am 07:27 AM

How to get the length of an array in Java

To get the length of an array in Java, you should use the length attribute; 1. Use the arrayName.length syntax to access the length directly without brackets; 2. It returns the integer value of the number of array elements, which is suitable for all types of arrays such as int[], String[], etc.; 3. The array length is determined and immutable when creating; 4. It is often used for loop traversal to avoid hard coding; 5. For two-dimensional arrays, array.length represents the number of rows and array[i].length represents the number of columns in the i-th row. So just remember to use array.length to get the array length accurately.

Sep 04, 2025 am 07:26 AM

How to append to a file in Java?

ToappendtoafileinJava,useFileWriterwiththesecondparametersettotruetoenableappendmode.2.Forbetterperformancewhenwritingmultiplesmallstrings,wrapFileWriterinaBufferedWriter.3.InmodernJavaversions,useFiles.write()withStandardOpenOption.APPENDformoreflex

Sep 04, 2025 am 05:44 AM

Log4j 1.x Migrate to Log4j 2.x: Solve the problem of XML configuration namespace binding

This document is intended to help developers migrate Log4j 1.x projects to Log4j 2.x and resolve XML configuration file namespace binding errors that may occur during the migration process. The article details how to update dependencies, modify code, and adjust XML configuration files to ensure the project successfully transitions to Log4j 2.x and avoid common configuration problems. Through this article, readers can master the configuration method of Log4j 2.x and successfully complete the project upgrade.

Sep 04, 2025 am 05:39 AM

The root cause and solution of glClear runtime errors in LWJGL Scala development

This article discusses the runtime error encountered when calling glClear in an LWJGL Scala application, which usually manifests as "no current context". The article points out that glClear is not the source of the problem, but a symptom of failure to properly initialize the OpenGL context. By parsing the OpenGL context establishment process in detail, especially the key role of GL.createCapabilities(), and providing modified code examples, helping developers solve such problems and ensuring the correct configuration of the OpenGL rendering environment.

Sep 04, 2025 am 05:36 AM

What is multithreading in Java?

MultithreadinginJavaallowsaprogramtoexecutemultipletasksconcurrentlywithinasingleprocessbyusingthreads,whicharethesmallestunitsofexecution;itenhancesperformancebyutilizingCPUresourcesefficiently,especiallyonmulti-coresystems,andenablesresponsivenessi

Sep 04, 2025 am 05:24 AM

Use the Java Stream API to find a Map with a Max in List

This article describes how to use the Java Stream API to find a Map with the largest "Length" value in List and explores the advantages of using custom objects instead of maps. At the same time, sample code is provided to find a single largest element and find all collections of elements with maximum values, and different methods of using the Stream API and Collections.max() are discussed.

Sep 04, 2025 am 04:54 AM

REST API Security Configuration Guide for JWT and External Authorization Servers in C# .NET

This article aims to provide a concise and clear tutorial to guide developers how to implement the security protection of the REST API through external authorized servers such as AWS Cognito or Asgardeo in C# .NET applications in pure resource server mode. The article will focus on how to use the JWT Bearer authentication mechanism to quickly build an API service that can verify incoming access tokens by minimizing configuration, without the need for deep integration of user management functions.

Sep 04, 2025 am 04:36 AM