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Judge right triangles in Java: Efficiently process array side lengths

This article aims to explore how to efficiently determine whether a triangle is a right triangle in Java. We will focus on how to use the Pythagorean theorem to verify whether it is true based on the given three side lengths, especially without modifying the original array, cleverly identify the hypotenuse and calculate the sum of squares of the remaining two right-angle edges. The article will provide clear solutions and sample code and discuss key considerations such as floating point comparisons.

Aug 24, 2025 am 07:00 AM

Find numbers with the same end numbers: Java Tutorial

This article aims to guide developers how to write a method in Java that takes an array of integers as input and returns an array of numbers with the same beginning and ending numbers. We will explore how to convert integers into strings, compare the beginning and end characters of the string, eventually returning an array of numbers that meet the criteria, and avoid repeated additions.

Aug 24, 2025 am 06:30 AM

How to use collections like List, Set, and Map in Java

When using List, when you need to maintain the insertion order, access elements through indexes, or allow repetitions, the commonly used implementations include ArrayList and LinkedList; 2. When using Set, when you need to avoid duplicate elements, quickly find or maintain uniqueness, the commonly used implementations include HashSet, LinkedHashSet and TreeSet; 3. When using Map, when you need to store key-value pairs, quickly find or ensure the uniqueness of keys, the commonly used implementations include HashMap, LinkedHashMap and TreeMap; the appropriate collection type should be selected according to the order, performance and thread safety requirements, and combined with generics and correct rewrite equals and hashCode methods to ensure type safety and positive

Aug 24, 2025 am 06:10 AM

data structure java collection

Print method name and return value using reflection in Java

This article discusses how to implement the requirement of printing Java method names and their return values ??without modifying existing classes and methods. By deeply analyzing the Java reflection API, we will learn how to dynamically obtain method objects, call methods and obtain their names, and finally implement a custom output format like "Method Name = Return Value", and discuss applicable scenarios and precautions for reflection to help readers understand and master this advanced feature.

Aug 24, 2025 am 06:03 AM

Java reflection: dynamically obtain and print method name and return value

This article will explore in-depth how to dynamically obtain and print the name of the method and its execution results through the Java reflection API without modifying existing classes and methods. We will explain in detail why direct calls cannot meet the needs and provide reflection-based solutions, including sample code, error handling, and considerations and performance considerations when using reflection.

Aug 24, 2025 am 05:39 AM

Tutorial on ISBN-10 formatting and verification code generation in Java

This tutorial details how to format 9-digit numeric input into a standard ISBN-10 format in Java, including calculating weighted checkcodes and inserting them correctly, while handling the special case of checkcodes as 'X', and implementing an accurate output structure through String.substring() and System.out.printf().

Aug 24, 2025 am 05:36 AM

Quarkus Integration of SAP HANA Database: Feasibility and Precautions

This article discusses the integration scheme between the Quarkus framework and SAP HANA database. In JVM mode, due to the built-in support of Hibernate ORM for SAP HANA, Quarkus can seamlessly connect and operate SAP HANA databases, and Panache can also be used normally. However, if you need to support SAP HANA in Quarkus Native Image, you need to ensure that the JDBC drivers provided by SAP are natively compatible.

Aug 24, 2025 am 05:18 AM

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