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Technical Articles

Java

javaTutorial

Integrating and using Kotlin ViewModel in Java (Hilt Support)

This article explains in detail how to initialize and call Kotlin ViewModel in Java code, especially when ViewModel integrates Hilt for dependency injection. The core is to use ViewModelProvider to get ViewModel instances and ensure that Java components (such as Activity) are correctly labeled @AndroidEntryPoint to support Hilt's dependency injection mechanism, thereby achieving seamless interaction between Java and Kotlin ViewModel.

Aug 18, 2025 am 04:27 AM

What distinguishes checked from unchecked exceptions in Java?

Thekeydistinctionisthatcheckedexceptionsareenforcedatcompiletimeandmustbeeithercaughtordeclared,whileuncheckedexceptions,whicharesubclassesofRuntimeException,arenotenforcedbythecompileranddonotrequireexplicithandling;checkedexceptionstypicallyresultf

Aug 18, 2025 am 03:54 AM

Use do-while to draw rectangles

This article will explain in detail how to use the do-while loop in Java to draw a rectangle with a specified height and width. By analyzing common errors and providing modified code examples, help readers understand the characteristics of do-while loops and master their application in graphic drawing.

Aug 18, 2025 am 03:09 AM

How to collect Stream results to a List or Set in Java

Use Collectors.toList() to collect stream elements into a list, for example: ListupperCaseNames=names.stream().map(String::toUpperCase).collect(Collectors.toList()); 2. Use Collectors.toSet() to collect into a collection without duplicate elements, for example: SetuniqueNumbers=numbers.stream().filter(n->n>2).collect(Collectors.toSet()); 3. If you need to specify

Aug 18, 2025 am 03:07 AM

Efficient way to convert byte arrays to BigInteger

This article describes how to efficiently convert an array of bytes into BigInteger objects, especially in scenarios such as file encryption and decryption, where a single byte is encoded into multiple bytes. The focus is to avoid unnecessary complexity, directly manipulate byte arrays, and implement fast conversions through bit operations, thereby improving data processing efficiency.

Aug 18, 2025 am 02:45 AM

How to copy an array in Java

UseSystem.arraycopy()forhigh-performancecopyingwithcontroloversourceanddestination;2.Useclone()forasimple,cleanone-linercopy;3.UseArrays.copyOf()forreadable,convenientcopying,especiallywhenresizing;4.UseArrays.copyOfRange()tocopyaspecificrangeofeleme

Aug 18, 2025 am 01:56 AM

java array

What is the contract between equals() and hashCode() in Java?

hashCode() must be rewritten, because according to Java specification, if two objects are equalized by equals(), their hashCode() must return the same integer, otherwise the object cannot be found correctly in collections such as HashMap; for example, when p1 and p2 have the same content but not hashCode(), it may be put into different hash buckets, causing map.get(p2) to return null; therefore, when rewriting equals(), hashCode() must be rewritten at the same time, and ensure that both are based on the same fields to ensure that equal objects have the same hash code, thereby ensuring the correct behavior of the hash collection.

Aug 18, 2025 am 01:28 AM

java

Two ways to correctly compare array minimum values in Java

This article aims to solve the direct comparison error caused by returning the OptionalInt type when the Java Stream API uses the min() method to obtain the minimum value of the array. We will explore the root of this problem in depth and provide two effective solutions: one is to use the getAsInt() method of OptionalInt to extract the original value for comparison, and the other is to introduce the NumberUtils.min() method in the Apache Commons Lang library to simplify operations, helping developers to process the comparison logic of the array's minimum value more efficiently and accurately.

Aug 18, 2025 am 01:09 AM

Best Practices for Java API Design

Use clear naming specifications, such as camelCase, PascalCase and UPPER_SNAKE_CASE, and select names with clear intentions; 2. Priority is used to adopt immutability and encapsulation, set the class to final, default private fields, and expose behavior through methods; 3. Realize extensibility through combination rather than inheritance, define contracts and inject behavior using interfaces; 4. Creating streaming interface builders for complex objects to improve readability; 5. Consistently handle null values, prioritize Optional to avoid returning null, and use Objects.requireNonNull to verify parameters; 6. Use exceptions reasonably, unchecked exceptions are used for programming errors, che

Aug 18, 2025 am 12:54 AM

java api design

Tutorial for generating images and sharing them to WhatsApp, Skype, and emails

This document aims to provide a practical way to convert any view (View) in an Android app into an image and share that image through apps such as WhatsApp, Skype, and Mail. This method is compatible with Android 6 to Android 10 devices, covering the complete process of image generation, storage, permission application and sharing, and provides sample code and precautions to help developers implement this function quickly.

Aug 17, 2025 pm 02:36 PM

Tutorial on generating n decreasing number sequence algorithms with a sum of 100

This tutorial aims to provide an algorithm that takes a count of numbers and the first number as input, generates a sequence of numbers with a sum of 100 and the numbers in the sequence show a decreasing trend. We will explain the implementation of the algorithm in detail and provide Java code examples to help readers understand how to use the algorithm in real-world applications.

Aug 17, 2025 pm 02:27 PM

Null Security Comparator Implementation of BigDecimal

This article describes how to implement a null-safe Comparator for the BigDecimal type to avoid NullPointerException during the sorting process. With sample code, we show how to combine Comparator.nullsFirst and Comparator.naturalOrder to create a BigDecimal comparator that handles null values and performs natural sorting and apply it to the sorting operation of the list.

Aug 17, 2025 pm 02:21 PM

SmallRye Mutiny Subscribe to unresponsive solutions when processing events asynchronously

This article aims to address the issue where subscribers cannot receive events when using SmallRye Mutiny for asynchronous event processing. By analyzing the backpressure mechanism of Reactive Streams, we provide manual request data and a simpler API solution using SmallRye, helping developers to correctly handle asynchronous event streams.

Aug 17, 2025 pm 02:15 PM

Spring Boot doctor-patient relationship management system: flexible data model and permission design

This article explores the core challenges of building a doctor-patient relationship management system in Spring Boot, including complex user roles (doctors and patients), many-to-many relationships, and role-based security authentication and authorization. By analyzing two common data model solutions, the article recommends a hybrid design combining common user entities with specific role entities and elaborates on implementation details, including entity relationship mapping, code examples, and Spring Security integration strategies, aiming to provide a flexible and scalable solution.

Aug 17, 2025 pm 02:09 PM