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Technical Articles

Java

javaTutorial

How to record SQL parameter binding for JPA queries in Spring Boot 3

This article aims to guide developers on how to correctly configure logs when using JPA in Spring Boot 3 projects so that SQL query statements and corresponding parameter bindings can be clearly recorded. By adjusting the log level of Hibernate, developers can better understand the SQL statements generated by JPA, and debug and optimize them.

Sep 12, 2025 am 10:00 AM

Best practices for handling currency data in Java

This article aims to explore best practices for handling monetary data in Java. Using String storage directly is an option, but may not be optimal, when it comes to currency values ??contained in JSON data (for example "$234,205,860"). This article will deeply analyze the pros and cons of various data types when processing currency, and recommends using BigDecimal for precise calculations, while providing code examples and precautions to help you process currency data efficiently and accurately in Java projects.

Sep 12, 2025 am 09:48 AM

Correctly call the instance method in Java: Take 'happy number' as an example

This article aims to solve common problems encountered by Java beginners when calling non-static instance methods in main methods. Through a case of "happy number" judgment, the difference between static methods and instance methods is explained in detail, and the principle that you must first create class instances when calling instance methods in a static context is emphasized. It also provides clear code examples and calling methods to help readers master the core concepts of object and method calls in Java. Correctly call the instance method in Java: Take "happy number" as an example

Sep 12, 2025 am 09:09 AM

Java multithreaded race conditions: understanding and experimental demonstration

This article aims to explore the Race Condition in Java multithreaded programming, explain why some code that seems to be concurrently operated (such as multithreaded summation) may not produce race conditions, and provide a clear experimental example to demonstrate how to create and observe race conditions. Help developers understand the nature of race conditions and their potential harm by analyzing shared variable states and non-atomic operations.

Sep 12, 2025 am 09:00 AM

Dynamic UI configuration: Best practices for returning UI field attributes in server JSON response

This article explores best practices for returning UI field properties (such as required, editable, etc.) in server JSON responses. The core point is that although it is necessary to return data values ??from the server, UI-related attributes and business logic are also placed on the server side, and the pros and cons need to be weighed. This article will analyze the advantages and disadvantages of this practice and provide some alternative ideas to help developers build a more flexible and maintainable front-end architecture.

Sep 12, 2025 am 08:54 AM

Solutions for duplicate values ??when generating IDs using stored procedures

This article aims to solve the problem of duplicate values ??in high concurrency environments when using stored procedures to generate IDs. By analyzing possible causes, including improper transaction management and lock mechanism issues, provide corresponding solutions, such as explicit use of transactions in stored procedures, optimizing SQL statements to avoid SELECT operations, and checking the locked configuration of database tables.

Sep 12, 2025 am 08:45 AM

Optimized quick sorting: Avoid stack overflow errors in large arrays

Quick sorting When processing large arrays, stack overflow errors may occur due to excessive recursion depth. This article will introduce in detail how to optimize the recursive strategy, that is, always make recursive calls to smaller partitions and use loops to process larger partitions, thereby limiting the recursive depth to the logarithmic level (O(log n)), effectively avoiding stack overflow while maintaining the average time complexity of the algorithm.

Sep 12, 2025 am 08:30 AM

Spring REST API: Resolving ambiguity in AntPattern matching

This article aims to resolve the routing ambiguity that may occur when using AntPathMatcher in the Spring REST API. By analyzing common path matching scenarios, such as dynamic paths containing special characters and pattern matching in the middle or end of the path, we will explore how to use the @PathVariable annotation to accurately extract path parameters and avoid conflicts between different routes, thereby ensuring the correctness and maintainability of the API.

Sep 12, 2025 am 07:51 AM

Race conditions in Java multithreaded programming: principle, reproduction and avoidance

This article explores the race conditions in Java multithreaded programming in depth and explains the core reason for its emergence - sharing mutable states and non-atomic operations. By analyzing a common misunderstanding (suming local variables is not a race condition), and providing a classic counter example, it demonstrates in detail how to reproduce race condition, and demonstrates the inconsistent data when multi-threaded concurrent access to shared resources. Finally, the article briefly mentions common strategies to avoid race conditions, aiming to improve developers' understanding of data synchronization problems in concurrent programming.

Sep 12, 2025 am 07:45 AM

Guide to Java Multithreaded Concurrent Task Execution and Performance Benchmarking

This tutorial will guide you how to implement concurrent execution of multiple independent tasks in Java, running different compute-intensive operations simultaneously by creating and managing threads, such as prime filtering and brute force testing. We will explore using the Thread class for thread management, introduce key methods for performance benchmarking such as System.nanoTime() and Thread.join(), and introduce the more advanced java.util.concurrent.ExecutorService framework to build efficient and controllable concurrent programs.

Sep 12, 2025 am 07:30 AM

Sort and find the specified columns of List in Java

This article describes how to sort the data of a List structure in Java, find a specific element in the sorted list, and finally output the complete row containing the element. Core methods include customizing collation using the Comparator interface, and efficiently finding target elements using IntStream.

Sep 12, 2025 am 07:06 AM

How to move a file in Java?

Use the Files.move() method to move files, 1. Use the StandardCopyOption.REPLACE_EXISTING option to allow overwriting of the target file; 2. Optional ATOMIC_MOVE to ensure atomicity; 3. Check whether the source file exists before moving; 4. Ensure that the target directory exists, and call Files.createDirectories() to create; 5. When the cross-file system fails, it can be copied first and then deleted; 6. Exceptions such as IOException must be handled. This method is simple and efficient, and it is recommended to use it first.

Sep 12, 2025 am 06:53 AM

How to use reflection in Java

Getting Class object can be implemented through .class syntax, getClass() method or Class.forName(); 2. Use getMethods() and getDeclaredMethods() to obtain public or declared methods, and dynamically call them through invoke(). Private methods need to enable access with setAccessible(true); 3. After obtaining fields through getDeclaredField(), its value can be read or modified, including private fields; 4. Dynamically create them through newInstance() or getDeclaredConstructor().newInstance()

Sep 12, 2025 am 06:51 AM

How to use wait and notify in Java

In Java, wait() and notify() must be used in synchronous code blocks, and conditions should always be checked with while loops to avoid false wake-up and race conditions; 1. Use synchronized to ensure that the thread holds object locks; 2. Use while loops to check conditions before calling wait() to prevent false wake-up; 3. wait() releases the lock and makes the thread wait until other threads call notify() or notifyAll(); 4. notify() wakes up a waiting thread, notifyAll() wakes up all waiting threads, it is recommended to use notifyAll() to avoid thread hunger; 5. Make sure to release the lock after notification so that the waiting thread can be re-released.

Sep 12, 2025 am 06:46 AM