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Technical Articles

Java

javaTutorial

How to use ReentrantLock in Java

ReentrantLockinJavaprovidesmorecontrolthansynchronized,offeringfeaturesliketryLock(),timedacquisition,interruptibility,andoptionalfairness;1.Alwaysusetry-finallytoensureunlock()iscalled;2.UsetryLock()toavoidblocking;3.UsetryLock(timeout)fortime-limit

Aug 31, 2025 am 07:19 AM

java

Solving Common Java NullPointerException Issues with Optional

Optional is a container class introduced by Java 8. It is used to clearly indicate that a value may be empty, thereby avoiding NullPointerException; 2. It simplifies nested null checking by providing map, orElse and other methods, preventing methods from returning null and standardizing collection return values; 3. Best practices include only returning values, avoiding the use of fields or parameters, distinguishing orElse from orElseGet, and not calling get() directly; 4. Optional should not be abused. If non-empty methods do not need to be wrapped, unnecessary Optional operations should be avoided in the stream; correct use of Optional can significantly improve code security and readability, but it requires good programming habits.

Aug 31, 2025 am 07:11 AM

java

Accurately identify Apple Silicon and Intel processor architecture in Java

This tutorial aims to solve the problem that the system.getProperty("os.arch") cannot accurately distinguish Apple Silicon (M1) from Intel processors in Java. We will explain in detail how to reliably detect the underlying CPU architecture in Java applications on Windows and macOS platforms using operating system native commands or environment variables, and provide cross-platform implementation examples to ensure that your application can execute specific logic based on different processor types.

Aug 31, 2025 am 07:09 AM

How do you manage sessions in a Java web application?

JavawebapplicationsmanagesessionsusingtheHttpSessioninterfacefromtheServletAPI,wheresessionsareobtainedviarequest.getSession(),dataisstoredandretrievedwithsetAttribute()andgetAttribute(),andsessionsareinvalidatedusingsession.invalidate();sessionconfi

Aug 31, 2025 am 07:05 AM

Profiling Java Applications with VisualVM and JProfiler

VisualVMisafree,lightweighttoolidealforbasicCPU,memory,andthreadprofilingwithheapdumpanalysis,suitableforlearningorquicklocaldiagnostics.2.JProfilerisacommercial,advancedtoolofferingdeepperformanceinsights,superiorUI,remoteprofiling,andintegrationwit

Aug 31, 2025 am 06:36 AM

java programming

How to create a JAR file from the command line

To create a JAR file, first make sure that the Java class is compiled into a .class file, and then package it with the jar command. 1. Compile the Java file: javacMyProgram.java; 2. Create JAR using the jarcf command: jarcfmyapp.jarMyProgram.class; 3. If there is a package structure, retain the directory structure and execute: jarcfmyapp.jarcom/; 4. To make the JAR executable, create manifest.txt containing Main-Class:com.example.Main and ending with a newline, and run: jarcmfmanifest.txtmyapp.j

Aug 31, 2025 am 06:35 AM

Real-time response of Flink aggregated data in Spring Boot applications

This article explores how to integrate Flink in Spring Boot applications and solves the problem of how to get aggregated results in real-time and respond to APIs when Flink handles unlimited data flows. The article analyzes the characteristics of infinite data flow, proposes a solution to convert data sources into bounded data sources, and uses Kafka examples to illustrate how to specify the start and end offsets to achieve the processing of bounded data, so as to meet the needs of obtaining aggregate results in real time.

Aug 31, 2025 am 06:27 AM

Java Tutorial: Simulating random events, counting occurrences and result analysis

This tutorial aims to guide how to use Java to generate random integers within a specified range, simulate random events such as coin toss, and conduct detailed statistics and analysis of event results. The content covers custom random number generation methods, specific value counting methods, data storage strategies, and how to identify the most occurring values ??and the frequency of occurrence of specific categories (such as front and back of coin) to build a functionally complete random event simulation and analysis program.

Aug 31, 2025 am 05:51 AM

Azure Blob storage upload file failed: Troubleshooting and solution for permissions

This article aims to help developers resolve the "AuthorizationFailure" error encountered when uploading files using Azure Blob storage. By analyzing error information, it is clear that insufficient permissions are the main cause of the problem. The article will explain in detail how to solve the upload permissions problem by configuring the network settings of your Azure storage account, especially adding client IP addresses to the firewall whitelist, so as to successfully complete the file upload operation.

Aug 31, 2025 am 05:12 AM

Solution to get the JSP Session property as NULL value and share cross-browser data

This article aims to solve the problem of session.getAttribute() returning NULL value in JSP development, and provides a solution to share data between different browser sessions. We will explore the different scopes in JSP in depth, and focus on how to use Application Scope to pass data between different browser instances to ensure data consistency and user experience of web applications in various scenarios.

Aug 31, 2025 am 04:57 AM

Java code refactoring practice: eliminating duplicate logic through method extraction

This tutorial explores in-depth how to effectively eliminate code redundancy by encapsulating duplicate business logic into independent methods in Java development, thereby improving code maintainability and readability. For specific logical fragments shared across multiple methods, we will demonstrate how to extract and integrate them into relevant entity classes, such as adding the getRoleIds() method in UserEntity to achieve thin and efficient reuse of the code while enhancing the expressive power of the domain model.

Aug 31, 2025 am 04:24 AM

Logback log output control: In-depth understanding and disabling default console output

This tutorial aims to solve the problem that Logback is still accidentally outputting to the console when the ConsoleAppender is not explicitly configured. The core is to understand Logback's logger level and additionity attributes. By setting the additionivity of a specific logger to false, log events can be effectively prevented from propagating to the upper logger (usually the root logger with the console output configured by default), thereby achieving precise control of the log output target.

Aug 31, 2025 am 04:21 AM

Writing High-Performance File I/O Code in Java

Using buffering, NIO, batch processing, and appropriate APIs is the key to implementing Java high-performance file I/O. 1. Always use BufferedInputStream/BufferedOutputStream or BufferedReader/BufferedWriter for buffering to reduce system calls; 2. Use FileChannel in the java.nio package to perform efficient reading and writing; 3. Use FileChannel.map to create a MappedByteBuffer for super-large files or random access scenarios to achieve memory mapping; 4. You can use Files directly to use Files for simple operations.

Aug 31, 2025 am 03:26 AM

Lucene query skills: Use MatchNoDocsQuery to implement secure empty query

When building a Lucene query, avoid returning null and provide an "empty" query that does not match any document when a specific condition is not met (such as a security check failure). This tutorial will provide detailed information on how to achieve this using the MatchNoDocsQuery class provided by Lucene, so as to ensure the robustness of the application logic, avoid potential NullPointerException, and improve the readability and maintenance of the code.

Aug 31, 2025 am 03:21 AM