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Technical Articles

Java

What is the Object class in Java?

TheObjectclassistherootofallclassesinJava,automaticallyinheritedbyeveryclassandprovidingessentialmethodssuchastoString(),equals(),hashCode(),clone(),getClass(),andthreadsynchronizationmethods;itenablesdefaultbehaviorsthatcanbeoverriddenformeaningfulo

Sep 11, 2025 pm 02:27 PM

java object class

Solve the problem of abnormal display of ANSI color code in Windows CMD terminal

This article explores the problem that Java applications cannot correctly display ANSI color code in Windows Command Prompt (CMD), although it works fine in integrated terminals such as VS Code. The article will introduce the root cause of this problem in detail and provide two main solutions: one is to delegate output through external commands (such as echo), and the other is to directly call Windows native functions to enable virtual terminal processing using the Foreign Function & Memory API provided by Java 22 and later to enable virtual terminal processing, thereby realizing color output of CMD terminals.

Sep 11, 2025 pm 01:48 PM

Efficient layout and performance optimization of a large number of pictures in Android ScrollView

This article aims to solve the performance bottlenecks that occur when ScrollView loads a large number of images in Android applications. In response to the inefficiency of TableLayout and GridLayout, we recommend using ConstraintLayout and emphasize the importance of building flat view levels. By optimizing layout selection and avoiding deep nesting, UI rendering can be significantly improved and user experience can be improved, especially when processing hundreds of image elements.

Sep 11, 2025 pm 01:45 PM

How to compare objects in Java using Comparable and Comparator?

Use the Comparable interface to define the natural sorting of objects. By implementing the compareTo() method within the class, it is suitable for single and clear sorting criteria (such as age and name); 2. Use the Comparator interface to implement custom or multiple sorting methods. There is no need to modify the original class. Comparable logic can be defined externally, which is suitable for multi-conditional sorting or third-party classes; 3. Comparable is located in the java.lang package, which requires the class to implement itself, and only supports one natural sorting, while Comparator is located in the java.util package, which supports multiple flexible sorting and can be added at any time; 4. It is recommended to use Comparable to set the default sorting, and use Comparator to achieve more complex

Sep 11, 2025 pm 01:27 PM

Reactor Flux dynamic data injection and stream merging strategy

This article aims to explore how to inject dynamic data into existing Flux in Reactor. We will introduce how to use Sinks.Many to create a controllable data source and effectively merge it with Flux provided by external libraries through operators such as Flux.merge() to form a unified responsive stream. At the same time, the article will focus on analyzing and coping strategies that may be encountered when subscribing to Flux (such as Flux based on UnicastProcessor).

Sep 11, 2025 pm 01:09 PM

What is the difference between throw and throws in Java?

throw is used to throw exception objects in the method, throws is used to indicate the check-type exception that may be thrown in the method declaration; for example, use thrownewIllegalArgumentException() to manually throw exceptions in the checkAge method, and use throwsIOException to declare possible exceptions after the readFile method. The combination of the two can realize the throwing and passing of exceptions. throw can only throw one exception object at a time, and throws can declare multiple exception types to jointly complete the Java exception handling mechanism.

Sep 11, 2025 pm 12:30 PM

How to create and load a constant dictionary from a file in Java

This article describes how to create a constant dictionary in a Java program and read data from a text file to initialize the dictionary. By using the static and final keywords, a constant that is immutable during the run of the program can be defined. At the same time, this article provides sample code showing how to read data from a file and store it into a constant for use in other parts of the program.

Sep 11, 2025 pm 12:24 PM

Find numbers with the same beginning and end: Java Tutorial

This article will describe how to write a function in Java that takes an array of integers as input and returns a new array containing all the same numbers in the original array with the same head and tail numbers. We will implement this by converting the number into a string and then comparing the beginning and end characters of the string. Additionally, to avoid duplicate numbers in the result, we will use a boolean array to track the added numbers.

Sep 11, 2025 pm 12:12 PM

What is a Future in Java?

AFutureinJavaisaninterfacerepresentingtheresultofanasynchronouscomputation,obtainedwhensubmittingaCallabletasktoanExecutorService,allowingyoutocheckcompletionstatus,retrieveresults,orcancelthetaskusingmethodslikeisDone(),get(),andcancel();itblocksunt

Sep 11, 2025 am 11:46 AM

java future

How to synchronize threads in Java?

The core methods of synchronizing threads in Java include: 1. Use synchronized keywords to modify methods or code blocks to ensure that only one thread executes at the same time, instance methods lock instance objects, static method lock classes, it is recommended to use synchronization blocks of private lock objects to improve encapsulation; 2. Use ReentrantLock to provide more flexible control than synchronized, such as tryLock(), interruptible locks and fair lock strategies, but locks must be released in finally blocks to prevent deadlocks; 3. Use advanced tools in the java.util.concurrent package, such as AtomicInteger and other atomic classes to achieve lock-free thread safety through CAS operations, to

Sep 11, 2025 am 11:42 AM

Thread synchronization java thread

How to handle exceptions in Java?

Usetry-catchblockstohandleexceptionsbyenclosingriskycodeintryandcatchingspecificexceptionslikeArithmeticExceptionorArrayIndexOutOfBoundsException.2.Usefinallyforcleanupcodethatrunsregardlessofexceptions,suchasclosingresources,thoughprefertry-with-res

Sep 11, 2025 am 09:44 AM

java Exception handling

What is Gradle in Java?

GradlestandsoutinJavaprojectsbecauseitcombinesdeclarativeconventionswithcustomizablecode,enablingflexibleandefficientbuildautomation;itsupportsincrementalbuilds,powerfuldependencymanagement,arichpluginecosystem,andusesreadableGroovy-orKotlin-basedDSL

Sep 11, 2025 am 09:28 AM

java gradle

Tutorial on efficiently sending registration verification codes (OTP) with AWS Pinpoint

This article aims to guide developers how to efficiently use AWS Pinpoint service to send user registration verification codes (OTPs) to solve the limitations of traditional AWS SNS when handling dynamic and unpre-registered mobile phone numbers. We will explore the advantages of Pinpoint as the preferred solution, provide specific implementation steps and code examples, and share best practices to ensure reliable and fast delivery of OTP messages.

Sep 11, 2025 am 12:42 AM

SnakeYAML processing YAML list object: Java class mapping depth analysis

In response to common problems encountered when using SnakeYAML to map complex list structures in YAML files to Java List objects, this article elaborates on the correspondence between correct Java class definition and YAML structure. Through specific examples, we guide developers how to create independent Java classes for each complex element in the list and ensure that the YAML indentation matches the Java object hierarchy, thus achieving efficient and error-free data conversion.

Sep 10, 2025 am 11:42 AM