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Technical Articles

Java

javaTutorial

How to copy a file in Java

TheeasiestandmostreliablewaytocopyafileinJavaisusingFiles.copy()fromthejava.nio.filepackage.2.AlwaysuseStandardCopyOption.REPLACE_EXISTINGtooverwritethedestinationfileifitexists,otherwiseaFileAlreadyExistsExceptionwillbethrown.3.Alternativestream-bas

Aug 23, 2025 am 09:37 AM

Compare version numbers using Java: Beyond regular expressions

This article introduces an effective way to compare version numbers using Java code that avoids the complexity and limitations of regular expressions. Version comparisons can be easily performed by parsing the version number into an array of integers and implementing the Comparable interface, and solve problems that may arise when using string comparisons directly, such as "4" < "10".

Aug 23, 2025 am 09:36 AM

Maestro UI test run error: NoSuchMethodError Solution

This article aims to resolve the java.lang.NoSuchMethodError: java.io.InputStream.readAllBytes()[B] error encountered when using Maestro for Flutter Application UI testing. By analyzing the error message, we determine that the root cause of the problem lies in JDK version conflicts and provide a clear solution: uninstall other JDK versions, keep only JDK 11, and ensure that Maestro is running properly.

Aug 23, 2025 am 09:33 AM

How to overload methods in Java

Method overloading allows multiple methods with the same name but different parameters in the same class. 1. Implemented by changing the number of parameters, such as add(inta,intb) and add(inta,intb,intc); 2. Implemented by changing the parameter type, such as add(doublea,doubleb) and add(Stringa,Stringb); 3. Implemented by changing the parameter order (presumably different types), such as show(inta,Stringb) and show(Stringa,intb); Overload does not depend on the return type, and the parameter list must be different, and the compiler selects the corresponding party according to the priority of precise matching, type promotion, automatic boxing, and variable parameters during compilation.

Aug 23, 2025 am 09:28 AM

Correct posture for merging string arrays in Java: Avoid null value traps and index management

This tutorial explores the common null value problems when merging two string arrays in Java. By analyzing the loop logic of errors, we reveal that improper index management is the key to data loss. The article provides a simple and efficient solution, leveraging the correct loop boundaries and clever index increment mechanism to ensure that all elements are copied correctly. In addition, it is also introduced to implement more optimized combination and consolidation strategies using advanced methods such as System.arraycopy.

Aug 23, 2025 am 09:18 AM

Java Concurrency: `ExecutorService` and Thread Pools Explained

ExecutorService is the core interface used in Java to simplify concurrent task management. It realizes asynchronous execution of tasks through thread pooling mechanisms to improve performance and resource utilization. 1. Using ExecutorService can avoid manually creating threads and decoupling task submission from execution; 2. Common thread pool types include newFixedThreadPool, newCachedThreadPool, newSingleThreadExecutor and newScheduledThreadPool, but it is recommended to explicitly use ThreadPoolExecutor in the production environment to accurately control core parameters; 3. Thread pool is operated by the worker.

Aug 23, 2025 am 09:17 AM

java Thread Pool

How to handle GET requests in Java with Spring Boot

First add SpringWeb dependencies in the project. Maven uses spring-boot-starter-web, and Gradle uses implementation'org.springframework.boot:spring-boot-starter-web'; 2. Create a controller class with @RestController, and use @RequestMapping to define the basic path; 3. Use @GetMapping to process GET requests, supporting root path, path variable @PathVariable and request parameter @RequestParam; 4. Methods can return objects

Aug 23, 2025 am 09:16 AM

Troubleshooting and Solutions for PermitAll() failure in Spring Security

This article aims to resolve the issue that the allowAll() method in Spring Security configuration fails to allow anonymous users to access specific interfaces as expected. We will analyze the causes of this problem and provide corresponding solutions to ensure that public interfaces such as registration can be accessed normally by unauthenticated users. Through this article, developers can better understand how Spring Security works and avoid common configuration errors.

Aug 23, 2025 am 09:09 AM

How to implement menu loop return function in Java

This article aims to help Java beginners solve the problem of returning to the main menu after a program has completed a specific task. We will introduce a loop structure to ensure that the program can continuously provide menu options before the user opts out, thus achieving a more user-friendly user interaction experience. The article will provide detailed code examples and explanations to help you easily master the implementation of menu loops.

Aug 23, 2025 am 08:42 AM

Calculate the difference between two dates and times in Java

This article describes how to calculate the difference between two LocalDateTime objects using the java.time package in Java 8 and later, and display it in minutes. The date and time string is parsed through DateTimeFormatter, the time difference is calculated using the Duration class, and finally the result is converted into minutes for easy comparison and judgment.

Aug 23, 2025 am 08:33 AM

Optimize Java code: Simplify change calculations using division and modulus operations

This article aims to help Java beginners optimize their change calculation code, avoiding lengthy while loops by using division and modulus operations, thereby improving code efficiency and readability. We will provide detailed code examples and explanations to help readers understand and master this simpler implementation.

Aug 23, 2025 am 08:30 AM

Compatibility of using different versions of AspectJ runtime and compile-time weaving code

This article discusses compatibility issues with different versions of runtime environments when using AspectJ for compile-time weaving. Especially when the project relies on external libraries compiled with older versions of AspectJ, it is safe and feasible to upgrade the AspectJ runtime version. The article gives clear suggestions and explains the reasons behind it to help developers avoid potential compatibility issues.

Aug 23, 2025 am 08:24 AM

Dynamic configuration: Loading Spring Boot application properties from the database

This article describes how to migrate the application.properties configuration of Spring Boot application to the database to implement dynamic configuration loading without restarting the server after each configuration modification. Dynamic updates and management of configurations are achieved by customizing PropertySource, reading configuration information from the database and adding it to Spring Boot's environment properties.

Aug 23, 2025 am 08:15 AM

Calculate the time difference between two LocalDateTime objects in Java

This article introduces several methods to calculate the time difference between two LocalDateTime objects in Java. The focus is on how to use the Duration class to obtain the time difference in different units such as minutes, hours, and days. Through sample code, readers can quickly master the skills of calculating time differences and apply them to actual development, such as determining whether two time points exceed a specific time interval.

Aug 23, 2025 am 08:06 AM