国产,三级,成人,а√天堂中文官网在线8

Article Tags

Home

Technical Articles

Java

javaTutorial

SLF4J log output alignment: Logback mode modifier depth analysis

As the Java log facade, SLF4J's log output format is not controlled by itself, but depends on the underlying log implementation framework. In Spring Boot applications, Logback is used by default. This article will explore Logback's pattern modifiers, especially width and fill options, to guide developers how to accurately control the log output format, realize requirements such as separator alignment, and improve log readability.

Aug 24, 2025 am 04:54 AM

Minimize the time required to complete a task: a tutorial on a line sweeping algorithm

This document details how to use the line sweep algorithm to solve the problem of minimizing the time it takes to complete a given set of tasks. Each task has a start time, an end time, and the duration required to complete. The goal is to find the shortest time required to complete all tasks, the tasks can be processed in parallel, and the task time period can be discontinuous. This article will provide clear algorithm logic, sample code and detailed explanations to help readers understand and apply the method.

Aug 24, 2025 am 03:21 AM

How to use Docker with Java

Use Docker and Java to combine applications into lightweight, portable containers to ensure cross-environment consistency. The specific steps are as follows: 1. Select the appropriate basic image, such as eclipse-temurin:17-jre-alpine to reduce volume and improve security; 2. Write Dockerfile, copy JAR file and set startup commands; 3. Build the image and run the container, map the corresponding ports; 4. Use multi-stage construction to separate the compilation and running environments to reduce the final image volume; 5. Add health check instructions to improve service reliability; 6. Create non-root users and switch running identities to enhance security; 7. Optionally integrate plug-ins such as Jib to achieve self-directed without the Docker daemon

Aug 24, 2025 am 01:59 AM

How to list all files in a directory in Java?

UseFile.listFiles()forsimple,legacycaseswithnullchecks;2.UseFiles.list()formodern,stream-basedoperationswithlambdasupport;3.UseFiles.newDirectoryStream()forefficient,filterediterationwithtry-with-resources;alwaysverifythedirectoryexists,handleIOExcep

Aug 24, 2025 am 12:54 AM

How to use a try-catch block in Java

Use the try-catch block to effectively handle exceptions in Java to prevent program crashes; 2. The try block contains code that may throw exceptions, and the catch block catches and handles specific types of exceptions; 3. Multiple catch blocks can be used to catch different exceptions in order, and specific exceptions should be caught first and then general exceptions should be caught; 4. Finally block will be executed regardless of whether an exception occurs, and is often used for resource cleaning; 5. Best practices include only catching exceptions that can be processed, avoid catching general exceptions, and prioritizing the use of try-with-resources to automatically manage resources; 6. By rationally using try-catch-finally, program stability can be improved and meaningful error feedback can be provided.

Aug 24, 2025 am 12:51 AM

Java Cryptography Architecture (JCA) for Secure Coding

Understand JCA core components such as MessageDigest, Cipher, KeyGenerator, SecureRandom, Signature, KeyStore, etc., which implement algorithms through the provider mechanism; 2. Use strong algorithms and parameters such as SHA-256/SHA-512, AES (256-bit key, GCM mode), RSA (2048-bit or above) and SecureRandom; 3. Avoid hard-coded keys, use KeyStore to manage keys, and generate keys through securely derived passwords such as PBKDF2; 4. Disable ECB mode, adopt authentication encryption modes such as GCM, use unique random IVs for each encryption, and clear sensitive ones in time

Aug 23, 2025 pm 01:20 PM

java secure coding

What is a deadlock in Java and how can you prevent it?

AdeadlockinJavaoccurswhentwoormorethreadsareblockedforever,eachwaitingforaresourceheldbytheother,typicallyduetocircularwaitcausedbyinconsistentlockordering;thiscanbepreventedbybreakingoneofthefournecessaryconditions—mutualexclusion,holdandwait,nopree

Aug 23, 2025 pm 12:55 PM

java deadlock

JUnit 5 Parameterized Test: Efficient Verification of Switch-Case Logic

This article details how to efficiently verify switch-case logic using JUnit 5's parameterized testing capabilities. The content covers avoiding mixed JUnit 4/5 annotations, correctly declaring parameterized tests, and optimizing code to be tested through separation of responsibilities to improve testability. With specific examples, we show how to combine Mockito to simulate dependencies and use @ValueSource or @EnumSource to ensure that all branches of switch-case are fully tested.

Aug 23, 2025 pm 12:45 PM

Detailed explanation of Jackson JSON attribute serialization: Use @JsonAlias ??to simplify configuration

This article deeply explores the serialization and deserialization of JSON attributes in the Jackson library, and focuses on how to use the @JsonAlias ??annotation to simplify configuration, avoid redundancy, and resolve possible attribute name conflicts. With sample code, a detailed explanation of how @JsonAlias ??maps multiple JSON attribute names to the same Java field when processing JSON data, simplifying the code and improving readability.

Aug 23, 2025 pm 12:42 PM

Dynamic parameter type processing: Builder mode to build flexible functions

This article provides an elegant solution for scenarios where function parameter types are uncertain (both numerical or function): Builder mode. Through the Builder mode, you can flexibly build functions and set parameters dynamically during the construction process, making the code more concise and easy to understand, avoiding a lot of duplicate code. This article will introduce the principles and implementation of the Builder pattern in detail, and demonstrate through examples how to apply the Builder pattern in Java to solve the problem of dynamic parameter types.

Aug 23, 2025 pm 12:27 PM

The correct posture to use generic interfaces: Java Tutorial

This article aims to illustrate how to use generic interfaces in Java and solve the type parameter problems encountered in inheritance relationships. Through specific code examples, two implementation methods are explained in detail: one is to make the parent class also a generic class and pass the type parameters; the other is to use wildcard characters to relax type restrictions. At the same time, this article also emphasizes the importance of declaring interface methods as public.

Aug 23, 2025 pm 12:21 PM

Optimize Java conditional statements: Simplify complex logic using DeMorgan's law

This article aims to help Java developers optimize complex conditional statements, especially if statements involving multiple conditional judgments. By applying DeMorgan's law, complex logical expressions can be converted into a more concise and readable form, avoiding redundant code and potential logical errors. This article will demonstrate through examples how to use DeMorgan's law to simplify if statements and improve the maintainability and readability of the code.

Aug 23, 2025 pm 12:15 PM

AspectJ Runtime Version Compatibility Guide

This article aims to address compatibility issues with different versions of AspectJ runtime environments when compile-time weaving is used with AspectJ. When there are external libraries in the project that are compiled with the old version of AspectJ, and also need to compile their own code with the new version of Java and AspectJ, the version selection of the runtime environment is crucial. This article will guide you on how to choose the right AspectJ runtime version to ensure the stable operation of your code.

Aug 23, 2025 pm 12:12 PM

How to check if a String is empty in Java

To check whether Java string is empty, you need to select the method according to whether it contains null or blank characters: 1. Use isEmpty() to check the zero-length string, but you need to make sure that the string is not null; 2. Use str==null, isEmpty() and trim().isEmpty() to manually process null, empty and blank strings; 3. If you use ApacheCommonsLang, you can directly use StringUtils.isBlank() to judge null, empty or pure blank strings, or use StringUtils.isEmpty() to check only null and zero lengths; 4. When there is no external library, it is recommended to return methods.

Aug 23, 2025 pm 12:11 PM