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Technical Articles

Java

$Use carriage return (\r) to overwrite the output in Java console$

Use carriage return (\r) to overwrite the output in Java console

This article aims to solve the problem that when Java programs use System.out.print("\r" message) to try to implement line overwrite updates in the console, the output becomes a line break. By analyzing the console settings of the Eclipse IDE, an effective solution is provided to help developers correctly use carriage return characters to achieve the expected output effect in a Windows environment.

Sep 08, 2025 am 01:51 AM

How to use multithreading in Java

TousemultithreadinginJava,extendtheThreadclassandoverridetherun()method,thencallstart()torunthreadsconcurrently.2.AbetterapproachisimplementingtheRunnableinterface,whichallowsclassinheritanceflexibilityandpromotescomposition.3.UseCallableandFuturewhe

Sep 08, 2025 am 01:44 AM

What is the java.time package in Java?

Thejava.timepackageinJavaprovidesareliableandintuitiveframeworkfordateandtimehandling,replacingtheflawedlegacyclasses.1.ItisbuiltonISO-8601andoffersimmutable,thread-safeclasses.2.KeyclassesincludeLocalDateTimefordate-timewithouttimezones,ZonedDateTim

Sep 08, 2025 am 01:20 AM

java

Problems and solutions to obtain JSP Session attribute as NULL

This article aims to solve the issue where the getAttribute() method returns NULL values ??when sharing JSP Session data between different browsers, such as IE and Edge. The article will dig into the scope concept of JSP and provide an effective way to share data between different browser sessions using Application scopes, while providing code examples and considerations to help developers understand and resolve such problems.

Sep 08, 2025 am 01:03 AM

Passing values ??from Thymeleaf to Controller that are not used in the view

This article describes how to use the Thymeleaf template engine to pass user identity information to the Controller in a Spring Boot project without explicitly displaying it in the view layer or having the user input. Through the @AuthenticationPrincipal annotation, you can directly obtain the identity information of the currently authenticated user in the Controller, thereby avoiding passing sensitive information in the view and simplifying code logic.

Sep 08, 2025 am 01:00 AM

what is a volatile keyword in java

VolatileinJavaensuresthatavariable’svalueisalwaysreadfromandwrittentomainmemory,preventingthread-localcaching,thusguaranteeingvisibilityofchangesacrossthreads;itestablishesahappens-beforerelationship,meaningwritestoavolatilevariablearevisibletosubseq

Sep 08, 2025 am 12:39 AM

JSON input validates OpenAPI/Swagger mode: Practical Guide and Tools

This tutorial explores how to use OpenAPI/Swagger mode to effectively verify JSON inputs directly, solving the limitations of traditional Java POJO verification. The article focuses on tools such as OpenAPI4j, which can parse and utilize API pattern definitions, thereby achieving efficient and automated data verification and ensuring strict compliance with API contracts.

Sep 07, 2025 pm 12:27 PM

Optimizing book packaging strategy: Algorithm tutorial to minimize the number of cartons

This tutorial discusses in detail how to calculate the minimum number of cartons required based on the number of bookshelfs, the number of books per shelf, and the capacity of cartons in the book packaging scenario. The article analyzes common error logic and provides an optimization algorithm based on integer division and remainder judgment to ensure accurate processing of leftover books, thereby minimizing the number of cartons.

Sep 07, 2025 pm 12:24 PM

Resolve the conflict between Flyway and Hibernate initialization data: Unified database version management

When using Spring Boot, Hibernate and Flyway for database management, a common problem is that Flyway runs before Hibernate creates a table, resulting in data insertion failure. This tutorial will explore this issue in depth and provide best practices: by configuring Flyway to unified management database structure creation and initial data filling, and at the same time disable Hibernate's DDL automatic update function to ensure database versioning, consistency and reliability, thereby avoiding data filling conflicts and achieving an efficient database initialization process.

Sep 07, 2025 pm 12:18 PM

OptaPlanner Overconstraint Planning: Policy selection for virtual and null variables

This article explores two core strategies for dealing with overconstrained planning in OptaPlanner: using nullable planning variables and introducing virtual values. We will compare the differences in resource allocation, constraint evaluation, and problem attribution of problems, and provide guidance on when to choose which strategy to help developers build efficient and logical solutions based on actual business needs.

Sep 07, 2025 pm 12:09 PM

The reason and solution for the error 'The left must be a variable' when modifying characters in a specific position in a string

This article aims to explain why you encounter the "left must be a variable" error when trying to directly modify characters in a string in Java, and provide a correct way to modify string characters. The article will help readers understand the immutability of strings and how to solve the problem using the StringBuilder or toCharArray() method through code examples and detailed explanations.

Sep 07, 2025 pm 12:00 PM

Detecting the underlying CPU architecture in Java (Intel vs. Apple Silicon)

Accurately identifying the underlying CPU architecture in Java applications, especially distinguishing between Intel and Apple Silicon, cannot rely solely on System.getProperty("os.arch"), because it reflects the JRE architecture rather than the real hardware of the host. This tutorial will guide you how to reliably obtain and parse CPU brand strings by calling operating system-specific environment variables (such as PROCESSOR_IDENTIFIER on Windows) and command-line tools (such as sysctl on macOS), thereby enabling cross-platform but operating system-specific CPU architecture detection.

Sep 07, 2025 am 11:57 AM

Deep analysis and solution for parameter type erasure of generic inheritance method in Java reflection

This article discusses the NoSuchMethodException problem caused by type erasure when Java reflection deals with inherited generic methods. The article explains the principle of type erasing, explains why generic parameters are replaced with Object types at runtime, and provides a solution: when reflecting the search method, Object.class should be used as the parameter type. At the same time, the sample code demonstrates how to verify the JVM-level method signature to help developers correctly understand and apply the reflection mechanism.

Sep 07, 2025 am 11:51 AM

Is the licensing relationship of Java sealed classes/interfaces transitive?

This article explores the meaning of the permits keyword in Java sealing classes and interfaces in detail, and explains the difference between it and inheritance relationship. By specific examples, it is clarified that permits only specifies direct subtypes, not all subtypes that are transitive. At the same time, combined with the exhaustiveness rules of switch expressions, the principle of type pattern matching and how to use inheritance relationships to achieve complete coverage of the sealed class hierarchy structure.

Sep 07, 2025 am 11:30 AM