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Technical Articles

Java

javaTutorial

How to use JAXB for XML binding in Java?

To use JAXB for XML binding, you first need to add dependencies in Java9, then create a Java class with JAXB annotation, and then convert objects and XML through JAXBContext. 1. For Java9 and above, jaxb-api and jaxb-runtime dependencies must be explicitly added; 2. Create a POJO and use @XmlRootElement, @XmlAccessorType, @XmlElement and other annotations to define XML mapping rules; 3. Use JAXBContext and Marshaller to serialize Java objects into XML; 4. Use JAXBContext and Un

Aug 19, 2025 pm 01:48 PM

What is inversion of control in Java?

InversionofControl(IoC)inJavaisadesignprinciplewhereobjectcreationanddependencymanagementaredelegatedtoacontainer,suchasSpring,insteadofbeinghandledbythecodedirectly;thisinversionreducestightcoupling,enhancesmodularity,andimprovestestabilityandmainta

Aug 19, 2025 pm 01:46 PM

java Inversion of control

A Guide to Logging in Java with SLF4J and Logback

SLF4J and Logback are recommended log combinations in Java applications. 1. Add Maven or Gradle dependencies to introduce slf4j-api and logback-classic. 2. Get the Logger instance of SLF4J in the code and use placeholders to record logs. 3. Configure the console and file output format and log levels through logback.xml under src/main/resources. 4. The SpringBoot project recommends using logback-spring.xml to support environmental configuration. 5. Follow the most important aspects of not recording sensitive information, avoiding circular logs, and using log levels.

Aug 19, 2025 pm 01:08 PM

Passing variables across scenarios in Cucumber: a not recommended but feasible solution

This article explores techniques for passing variables across scenarios in Cucumber testing and emphasizes that this practice is usually not recommended. Nevertheless, the article provides a way to achieve this using global variables and introduces the use of the Background keyword as a more appropriate alternative to ensure the independence and maintainability of the test.

Aug 19, 2025 pm 12:48 PM

Troubleshooting and solutions for pre-filled data in Room database

This article explores in-depth common reasons and solutions for Android Room databases to appear empty after pre-populated data. The core problem is that the onCreate method in RoomDatabase.Callback is only executed once the database is first created. The article analyzes this lifecycle behavior in detail and provides a direct way to force database recreation by uninstalling the application or clearing the data. It also introduces tips for verifying data filling and more advanced pre-filling best practices to ensure that developers can correctly implement the initialization and data preloading of Room databases.

Aug 19, 2025 pm 12:39 PM

Practical Guide to Integrating Kotlin Native Executables and JVM Fallback Mechanisms in JAR

This article discusses how to package the multi-platform executable file generated by Kotlin Native compiled and JVM implementation into the same JAR file, and uses Java Native Interface (JNI) to achieve a balance between performance optimization and cross-platform compatibility. By dynamically loading the applicable local library at runtime and gracefully falling back to pure JVM implementations when the local library is unavailable, this solution provides a feasible path for applications that pursue high performance and require a wide range of platform support.

Aug 19, 2025 pm 12:36 PM

what are access modifiers in java

Java has four access modifiers, from high to low to private, default, protected and public, which control the access scope of classes, methods, fields and constructors respectively: private members are only accessible in the same class; default (no modifier) members are accessible in the same package; protected members are accessible in the same package and in subclasses of different packages; public members can be accessed anywhere, and the rational use of these modifiers helps to achieve encapsulation, security and maintainability of code.

Aug 19, 2025 pm 12:34 PM

Room database pre-filled data does not display problem analysis and solution

This article aims to solve the problem that the RecyclerView appears as an empty list after the Room database is pre-populated. The core is to understand the working mechanism of the onCreate method in RoomDatabase.Callback: it is only called when the database is first created. If the database already exists, this callback will not be triggered again even if the previous pre-filling fails. Solutions usually involve uninstalling the application to force database reconstruction, or making judgments at the data layer to ensure data filling.

Aug 19, 2025 pm 12:33 PM

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