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Technical Articles

Java

javaTutorial

Optimize Java code: Simplify change calculations using division and modulo

This article aims to provide a more concise and efficient way to implement change calculation function in Java code. By using division and modulo operations, lengthy while loops can be avoided, code length is significantly shortened and program performance is improved. The article will provide detailed descriptions on how to use these two operations to directly calculate the amount of currency for various denominations, and provide complete code examples and necessary explanations.

Aug 28, 2025 am 09:18 AM

Implement nested selection query using Spring Data MongoDB

This article describes how to implement nested selection queries using Spring Data MongoDB and MongoRepository or MongoTemplate, that is, to find documents containing the field value based on the field values ??nested in the document array. The article provides code examples that demonstrate how to use Criteria to build query conditions and execute queries using mongoTemplate.find or MongoRepository interfaces.

Aug 28, 2025 am 09:12 AM

Solve the problem of missing FXML files in JavaFX JAR package

This article aims to solve the problem that the FXML file cannot be loaded correctly after JavaFX programs are packaged into JAR files. By analyzing the resource file loading method and building configuration, we provide methods to ensure that the FXML file is included in the JAR package, and give corresponding code examples and precautions to help developers avoid similar errors and successfully publish executable JavaFX applications.

Aug 28, 2025 am 08:45 AM

Compare version numbers using Java: A more robust way

This article introduces an effective way to compare version numbers in Java, avoiding the limitation of using regular expressions for complex matching. By parsing the version number into an array of integers and implementing the Comparable interface, we can easily compare the size of the version number, thus implementing functions such as version control and dependency management. This approach is easier to understand, maintain, and extend, and can handle various version number formats more accurately.

Aug 28, 2025 am 08:30 AM

Understand the statelessness of REST API: Avoid the trap of cross-request memory state management

This article aims to explore how to correctly manage application status in Java core REST API development. In response to the need to maintain cross-request states such as user lists in API server memory, the article will thoroughly analyze the stateless principle of REST architecture, clarifying why this method violates REST specifications and may lead to scalability and reliability issues. We will provide REST-compliant alternatives, highlight the importance of state management using external persistent storage such as databases, and demonstrate the correct practical approach with sample code.

Aug 28, 2025 am 08:06 AM

How to use generics in Java

GenericclassesusetypeparameterslikeTtocreatereusablecode,e.g.,Boxfortype-safecontainers.2.Genericmethodsdeclaretypeparametersbeforethereturntype,e.g.,voidprintArray(T[]array),enablingtype-safeoperationsacrossdifferenttypes.3.Boundedtypeparametersrest

Aug 28, 2025 am 07:24 AM

How to convert a primitive array to a List in Java?

To convert an array of basic types to List, you must first box the basic types as a wrapper class, because Java collections do not support basic types; 1. Use streams (recommended): generate streams through Arrays.stream(), call .boxed(), and then collect them as List with collect(Collectors.toList()); 2. Manual loop: traverse the array and add them to ArrayList one by one using automatic boxing, which is suitable for old versions of Java or performance-sensitive scenarios; 3. Avoid using Arrays.asList() directly, it will treat the entire basic type array as a single element, resulting in the type List rather than List; for double[], l

Aug 28, 2025 am 07:23 AM

How to filter a collection with Java Streams

When filtering a collection using JavaStreams, first create a stream through stream(), then pass the Predicate condition into a filter() method for filtering, and finally collect the results into a new set through collect(), and the original set is not affected; 1. For integer lists, even numbers can be filtered using conditions such as n->n%2==0; 2. For object lists such as Person, adults can be filtered by person->person.getAge()>=18; 3. Multiple filter() can be called chained or merged conditions such as p->p.getAge()>=18&&p.getName().

Aug 28, 2025 am 07:13 AM

集合過(guò)濾

What is the difference between inheritance and composition in Java?

Inheritanceestablishesan"is-a"relationshipusingtheextendskeyword,allowingaclasslikeDogtoinheritfromAnimal,enablingcodereuseandpolymorphismbutcreatingtightcouplingandlimitingflexibilityduetosingleinheritance,whereascompositionrepresentsa&quo

Aug 28, 2025 am 07:04 AM

inherit combination

Column replacement and sorting of List in Java: Implement efficient search and data operations

This article details how to find and sort List in Java in detail, and provides an efficient solution. Through custom Comparator, the entire list can be sorted according to the value of the specified column, and then algorithms such as binary search can be used to quickly locate the target row and obtain the complete information of the row. The article also provides complete sample code to help readers understand and apply the method.

Aug 28, 2025 am 06:42 AM

Loading Shader in Java Vulkan using GLSL files

This tutorial will explain how to use GLSL (OpenGL Shading Language) to write shaders in Java Vulkan applications. Since Vulkan accepts SPIR-V format shaders, it is necessary to compile the GLSL code into the SPIR-V binary first. This tutorial will provide a way to compile using the ShaderSPIRVUtils tool and provide relevant resource links to help developers successfully load and use GLSL shaders in Java Vulkan projects.

Aug 28, 2025 am 06:33 AM

REST API design principles: Understanding statelessness and persistent data management

In the REST API design, maintaining the memory state of server-side variables (such as user lists) across different API calls is contrary to the stateless principle of REST. The RESTful service should treat each request as an independent transaction and does not depend on the server-side session state. For data that needs to be persisted, external storage mechanisms such as databases and file systems should be adopted instead of directly maintained in memory to ensure the scalability, reliability and consistency of the system.

Aug 28, 2025 am 06:30 AM

How to use Callable and Future for asynchronous computation in Java

Callable and Future are used for asynchronous calculations in Java. Callable can return results and throw exceptions. Future is used to obtain asynchronous task results; 1. Create Callable task to return results; 2. Submit task to obtain Future; 3. Call Future.get() to block the results; 4. You can set get(3, TimeUnit.SECONDS) timeout to avoid infinite waiting; 5. Check the task status through isDone() and isCancelled(); 6. Call cancel(true) to cancel the task; pay attention to always calling executor.shutdo

Aug 28, 2025 am 06:14 AM

what is encapsulation and how to achieve it in java

Encapsulation is one of the four basic principles of object-oriented programming. Its core is to bundle data and methods of operating data into classes, and hide internal state by privatizing fields and providing public getter/setter methods, thereby protecting data from being directly accessed or modified, ensuring data integrity, improving code maintainability, and achieving flexible and secure interaction through controlled interfaces.

Aug 28, 2025 am 05:43 AM

java encapsulation