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Technical Articles

Java

javaTutorial

Mastering Java Concurrency: A Deep Dive into Multithreading

MasteringJavaconcurrencyrequiresunderstandingthreadlifecycle,creationviaThreadorRunnable,andproperuseofstart().2.Sharedmutablestateleadstoraceconditions;fixwithsynchronizedblocks,volatileforvisibility,orAtomicIntegerforatomicoperationsusingCAS.3.Ensu

Aug 17, 2025 am 11:49 AM

Multithreading java concurrency

Modify final fields in Java 17 using reflection

This article describes how to modify non-static final fields through reflection in Java 17. Due to the limitations brought by Java version updates, the traditional way of modifying the modifiers field is no longer applicable. This article will provide a VarHandle-based solution and details the required JVM startup parameters and code implementations to help developers break through final limitations when necessary.

Aug 17, 2025 am 11:48 AM

How to work with dates and times in Java?

Use Java.time package of Java8 to process dates and times efficiently, 1. Use LocalDateTime, ZonedDateTime, Instant and other classes to represent time, 2. Parsing and formatting strings through DateTimeFormatter, 3. Use ZoneId to process time zones and avoid three-letter time zone IDs, 4. Use Instant to represent UTC time points for logging and storage, 5. Use Duration and Period to calculate time difference, 6. Avoid using outdated Date and Calendar classes, 7. Use UTC to prioritize use of UTC and support JSON serialization with JavaTimeModule.

Aug 17, 2025 am 11:43 AM

Tutorial for initializing and calling Kotlin Hilt ViewModel in Java code

This tutorial details how to initialize and call a Kotlin ViewModel using Hilt injection in Java Android components. The core is to ensure that Java components (such as Activity or Fragment) are correctly labeled @AndroidEntryPoint, and the ViewModel instance is obtained through ViewModelProvider, thereby achieving seamless interaction between Kotlin and Java and effectively managing UI-related data and business logic.

Aug 17, 2025 am 11:42 AM

How to pause a thread in Java

UseThread.sleep(longmillis)topauseathreadforaspecifiedtime,whichisthestandardandsafeapproach;2.OptionallyaddnanosecondsforprecisionusingThread.sleep(millis,nanos);3.Avoiddeprecatedmethodslikesuspend()andresume()duetodeadlockandraceconditionrisks;4.Fo

Aug 17, 2025 am 11:39 AM

java thread

Optimizing nested loops with HashMap: Java object array conversion

This article aims to provide an efficient way to optimize nested loops in Java using HashMap, especially when loops involve arrays of objects and perform equality checks. By converting the inner loop into a HashMap query, it can significantly reduce time complexity and improve code performance. This article will provide detailed steps and sample code to help readers understand and apply this optimization technique.

Aug 17, 2025 am 11:36 AM

How is a HashMap implemented in Java?

AHashMapinJavaworksbyusinganarrayofbucketswhereeachbucketstoreskey-valuepairsvialinkedlistsortrees;1.ItcomputesthehashofakeyandappliesabitwiseANDwith(n-1)tofindthebucketindex;2.Collisionsarehandledthroughchaining,withlinkedlistsconvertingtored-blackt

Aug 17, 2025 am 11:30 AM

What are the core principles of Object-Oriented Programming in Java?

ThefourcoreprinciplesofOOPinJavaareencapsulation,abstraction,inheritance,andpolymorphism.1.Encapsulationbundlesdataandmethodswithinaclassandrestrictsdirectaccessusingprivatefields,providingcontrolledaccessviapublicgetterandsettermethodstoensuredatain

Aug 17, 2025 am 11:23 AM

Resource access and configuration management in Maven multi-module project

In Maven multi-module projects, cross-module access to resources (such as configuration files) is a common requirement. This article will explore how to safely and efficiently read resource files in another module through Maven's dependency management mechanism. We will introduce in detail the method of introducing resource modules as dependencies and using class loaders to correctly load resources, avoiding manual copying of files or inappropriate file path references, thereby optimizing project structure and maintenance efficiency.

Aug 17, 2025 am 11:00 AM

How to use the Optional class in Java

Optional is a container class introduced by Java 8 to avoid NullPointerException, which clearly indicates that the value may exist or does not exist; 1. Use Optional.empty() to create an empty instance, Optional.of(value) wraps non-null values, Optional.ofNullable(value) handles values that may be null; 2. Use isPresent() to determine whether the value exists, and use ifPresent(Consumer) to perform safe operations to avoid calling get() directly to prevent exceptions; 3. Use orElse(defaultValue) to provide default values, orE

Aug 17, 2025 am 10:55 AM

java

Couchbase and string pool: Optimize storage of large-scale cached data

This article explores how to optimize storage space by leveraging the concept of string pooling when using Couchbase to cache large amounts of data. For documents that store large numbers of duplicate strings, especially key-value pair structures, where keys correspond to a list of small number of fixed string values, this article will explain how to implement string residency through a custom Jackson deserializer, significantly reducing the size of cached documents and improving storage efficiency.

Aug 17, 2025 am 10:42 AM

How to use the Stream API in Java

Java's StreamAPI provides a declarative and functional data processing method. The answer is to create streams and chain calls intermediate and terminal operations to achieve efficient data processing. 1. You can create streams from collections, arrays, Stream.of(), generate or iterate; 2. Intermediate operations such as filter, map, flatMap, distinct, sorted, limit and skip are used to convert and filter data, and are lazy execution; 3. Terminal operations such as forEach, collect, reduce, match operations and findFirst trigger actual calculations and produce results; 4. In actual applications, filter can be used

Aug 17, 2025 am 10:27 AM

java

What is the difference between Serializable and Externalizable in Java?

ThemaindifferenceisthatSerializableusesautomaticserializationwithreflection,requiringnomethods,whileExternalizableprovidesfullcontrolthroughwriteExternal()andreadExternal(),demandsano-argconstructor,improvesperformancebyreducingmetadata,andisusedwhen

Aug 17, 2025 am 09:33 AM

java Serialization

Tutorial for finding the first non-repeat character in a string

This article aims to provide a clear and concise tutorial on how to efficiently find the first non-repetitive character from a given string. We will dig into the solution, provide sample code, and explain the logic behind it, ensuring that the reader can understand and apply the method.

Aug 17, 2025 am 08:57 AM