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Java application dependency deployment strategy: from traditional packaging to native distribution

This article explores the deployment strategies of Java applications and their external dependencies on the server. From traditional fat JAR and detached JAR deployments, to recommended archive file packaging practices, to framework-specific deployments such as WAR packages, and applications of modern native packaging tool JPackage, we aim to provide a safe, efficient and easy-to-maintain deployment solution. The article elaborates on the advantages and disadvantages of various methods in detail, and provides practical operation suggestions to help developers choose the most suitable deployment method according to project needs and effectively manage dependency upgrades.

Aug 19, 2025 pm 12:27 PM

Strategies for efficiently judging side lengths of right triangles in Java

This article aims to explore how to efficiently determine whether a triangle is a right triangle in Java. We will focus on how to verify using Pythagorean theorem (a2 b2 = c2) when the trilateral length of a triangle is stored in an array. The article will introduce a strategy to identify the longest edge (skewed edge) without modifying the original array and calculate the sum of squares of the remaining two sides, thus avoiding the complexity and potential performance problems caused by removing array elements in traditional methods.

Aug 19, 2025 pm 12:24 PM

Understanding standard output buffering: Analysis of behavioral differences between Python, C, Java and Go

This article explores the differences in standard output (stdout) buffering mechanisms in different programming languages, especially when the output is connected to a terminal (TTY) or a pipeline. We will parse Python and C in pipeline scenarios using block buffering by default, resulting in output delays, while Java and Go tend to refresh in real time. The article will provide code examples and guide how to control and manage output buffers to ensure that expected program behavior is achieved in a variety of environments.

Aug 19, 2025 pm 12:15 PM

what is StringBuilder in java

The problem of string splicing stems from the immutability of String. Frequent splicing will produce a large number of temporary objects, reducing efficiency. StringBuilder efficiently handles string modification through append, insert and other methods, and is suitable for single-threaded environments. 1. Use append() to append content and support chain calls; 2. Call toString() to get the final result; 3. Complex operations can be implemented through insert(), delete(), and reverse(); 4. The difference with StringBuffer is that StringBuilder is not thread-safe but has better performance; 5. It is recommended to specify the capacity during initialization to release resources in a timely manner to avoid abuse.

Aug 19, 2025 pm 12:04 PM

Optimize the generation and processing of arrangement combinations in Java: Taking the 'Hiring Assistant' problem as an example

This article explores in-depth how to efficiently generate all permutations of a given array in Java and apply them to the "hire assistant" problem to calculate the probability of the number of assistants under specific conditions. The article explains in detail the principle of generating arrangements by backtracking, corrects the common misunderstandings of flattening all arrangements, and provides a method to correctly traverse and handle single arrangements. At the same time, theoretical calculations are introduced for results verification, aiming to help readers understand and master the application of arrangement combinations in practical problems.

Aug 19, 2025 pm 12:03 PM

How to use reflection to inspect a class in Java

To check Java classes using reflection, first get the Class object, and then analyze its members through the methods in the java.lang.reflect package; 1. Get the Class object can be loaded dynamically through .class syntax, getClass() method or Class.forName(); 2. Check class metadata such as class name, package name, modifier, parent class, etc.; 3. Use getDeclaredFields(), getDeclaredMethods() and getDeclaredConstructors() to obtain all fields, methods and constructors in the class, including private members; 4. Check through getAnnotations()

Aug 19, 2025 am 11:51 AM

Developing Custom Java Annotations

To create and use custom Java annotations, you must first define the annotations and configure their behavior with meta annotations before processing them through reflection or processor. 1. Use @interface to define annotations, including elements with default values or without default values; 2. Use @Target, @Retention and other meta annotations to limit the scope and life cycle of annotations; 3. Read the annotations at runtime through reflection and execute the corresponding logic; 4. If you need to reuse annotations, you need to specify the container annotations with @Repeatable. Ultimately, only by combining processor or framework logic can annotations play a practical role, otherwise they are just metadata.

Aug 19, 2025 am 11:48 AM

What are the different access modifiers available in Java?

private: accessible only in the same class, used to restrict members from being invisible to the outside; 2.default (without modifier): accessible in the same package, suitable for sharing among classes within the package; 3.protected: accessible in the same package and in subclasses of different packages, supporting inherited access; 4.public: accessible anywhere, suitable for members who need to be disclosed; the strictest access modifiers should be used first to enhance encapsulation, security and code maintainability.

Aug 19, 2025 am 11:38 AM

java access modifier

Spark SQL: Efficiently check the existence of fields in Row or StructType mode

This tutorial details how to efficiently check whether Row or StructType mode (Schema) contains specific fields in Apache Spark. We will explore two main methods: using StructType.exists() to flexibly judge through predicates, and using StructType.getFieldIndex() to directly obtain the field index and determine whether it exists. The article aims to provide clear sample code and best practices to help developers accurately manage data patterns in Spark applications.

Aug 19, 2025 am 11:27 AM

Solve the problem that Taylor formula calculates cos(x) beyond the range of [-1, 1]

This article aims to solve the problem that the result is beyond the range of [-1, 1] when calculating cos(x) using the Taylor formula. By analyzing the possible integer overflow problems in the code and providing corresponding fixes, we can help readers understand the limitations of Taylor's formulas and the details that need to be paid attention to in numerical calculations. At the same time, the article also explores how to improve calculation accuracy and expand the scope of application by optimizing algorithms, such as using the periodicity of cos(x).

Aug 19, 2025 am 11:18 AM

Best practices for dynamically loading Spring Beans

This article describes how to dynamically load different bean implementations based on the environment in Spring applications. By using @Conditional annotation and manually configuring the bean, DoThingService or NoopService can be selectively loaded based on specific conditions, avoiding bean conflict issues and simplifying unit testing.

Aug 19, 2025 am 10:42 AM