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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

Passing time between UI and backend: UTC and time zone selection

This article explores in-depth best practices for passing date and time data between the UI and the backend system, especially when the backend system adopts the EST (America/New York) time zone. The article recommends using UTC as a general standard for data exchange, using the java.time.Instant class to process UTC time, and convert it to a specific time zone only when the user interface display and specific business logic is required (such as America/New_York). Avoid using informal time zones such as "EST", but should use the standard IANA time zone name.

Sep 07, 2025 am 11:24 AM

Java Scanner input verification: In-depth understanding and try-catch exception handling practice

This article aims to solve the InputMismatchException issue caused by Java Scanner when processing user non-integral inputs. We will explore the behavior mechanism of the nextInt() method, explain why the traditional hasNextInt() check cannot effectively prevent program crashes, and introduce in detail how to use the try-catch block to catch exceptions, and at the same time, combine sc.next() to clear invalid input, thereby building robust and user-friendly input verification logic.

Sep 07, 2025 am 11:18 AM

Implementing XNOR gate logic using Java

This document is intended to guide readers to implement XNOR (XIXOR) gate logic using the Java programming language. Through the graphical user interface (GUI), users can simulate the input of the XNOR gate and observe the output. This article will provide complete code examples and explain key concepts to help readers understand and apply XNOR gate logic. By studying this article, readers will master the basic skills of building interactive logic gate simulators using Java Swing.

Sep 07, 2025 am 11:06 AM

Common pitfalls and solutions for Mock object injection and method verification in Mockito test

This article explores the common InvocationTargetException and verification failure issues in Mockito/PowerMock tests. The core is to understand how the object being tested obtains its internal dependencies. The article will explain in detail how to control dependency creation by staked the internal methods of spy objects, and correctly use MockitoJUnit.rule() for test settings, and compare the differences between spy and InjectMocks, provide clear sample code and best practices to help developers build robust unit tests.

Sep 07, 2025 am 10:54 AM

Variable occlusion in Java inheritance: In-depth understanding and solutions

This article explores the common variable shadowing problem in Java inheritance and explains how it causes the conditional judgment logic to fail. By analyzing the declaration mechanism of the same name variable in parent and child classes, clear code examples and solutions are provided, aiming to help developers avoid such traps and ensure the correctness and predictability of object-oriented design, especially in implementations of the dependency inversion principle (DIP).

Sep 07, 2025 am 10:48 AM