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Managing Dependencies in a Large-Scale Java Project

UseMavenorGradleconsistentlywithcentralizedversionmanagementandBOMsforcompatibility.2.Inspectandexcludetransitivedependenciestopreventconflictsandvulnerabilities.3.EnforceversionconsistencyusingtoolslikeMavenEnforcerPluginandautomateupdateswithDepend

Jul 24, 2025 am 03:27 AM

java Dependency management

Mastering Java 8 Streams and Lambdas

The two core features of Java8 are Lambda expressions and StreamsAPI, which make the code more concise and support functional programming. 1. Lambda expressions are used to simplify the implementation of functional interfaces. The syntax is (parameters)->expression or (parameters)->{statements;}, for example (a,b)->a.getAge()-b.getAge() instead of anonymous internal classes; references such as System.out::println can further simplify the code. 2.StreamsAPI provides a declarative data processing pipeline, the basic process is: create Strea

Jul 24, 2025 am 03:26 AM

Java Security Tokenization and Encryption

SecurityToken is used in Java applications for authentication and authorization, encapsulating user information through Tokenization to achieve stateless authentication. 1. Use the jjwt library to generate JWT, select the HS256 or RS256 signature algorithm and set the expiration time; 2. Token is used for authentication, Encryption is used for data protection, sensitive data should be encrypted using AES or RSA, and passwords should be stored with hash salt; 3. Security precautions include avoiding none signatures, setting the expiration time of tokens, using HTTPS and HttpOnlyCookies to store tokens; 4. In actual development, it is recommended to combine SpringSecurity and

Jul 24, 2025 am 03:24 AM

The role of `var` for Local-Variable Type Inference in Java

var was introduced in Java 10 for local variable type inference, to determine the type during compilation, and maintain static type safety; 2. It can only be used for local variables in methods with initialized expressions, and cannot be used for fields, parameters or return types; 3. Non-initialization, null initialization and lambda expression initialization are prohibited; 4. It is recommended to use them when the type is obvious to improve simplicity and avoid scenarios that reduce readability. For example, types should be explicitly declared when complex methods are called.

Jul 24, 2025 am 03:23 AM

java executor service thread pool example

Use thread pools to effectively manage concurrent tasks and avoid resource waste; 1. The thread pool reduces the creation and destruction overhead by reusing threads, controls the number of concurrency and supports task scheduling; 2. Types such as newFixedThreadPool, newCachedThreadPool and other types can be created through the Executors factory class, but custom parameters are recommended in the production environment; 3. Submit tasks to obtain Future results or execute() or execute() to execute no return tasks; 4. Close the thread pool, shutdown() should be called mildly or shutdownNow() to try to terminate the task immediately.

Jul 24, 2025 am 03:22 AM

Java Records vs Lombok: A Detailed Comparison

Choosing JavaRecords or Lombok depends on core requirements: Records is designed for immutable data (such as DTO), with transparent and dependable code; Lombok is suitable for scenarios where flexibility (such as Builder, variable state). 2. Records syntax is minimalist, IDE natively supports, and has no "magic", suitable for modern Java projects; Lombok relies on plug-ins and annotation processors, which are prone to errors but have rich features. 3. If the team uses Java16 and pursues concise and safe data classes, choose Records; if it needs to be compatible with old versions, complex construction logic, or existing Lombok ecosystem, choose Lombok. The two can coexist, and it is most pragmatic to use it according to the use case.

Jul 24, 2025 am 03:21 AM

Is Java Still Relevant for Modern Web Development?

Javaremainsrelevantformodernwebdevelopment,especiallyforenterprise-gradebackendsystemsduetoitsstability,scalability,andstrongecosystemwithSpringBoot.2.ItexcelsinperformanceviaJVMoptimizationandGraalVM,supportsmodernfeatureslikerecordsandtextblocksfro

Jul 24, 2025 am 03:06 AM

Hibernate vs. MyBatis: A Detailed Java ORM Comparison

Hibernateisafull-fledgedORMframeworkthatabstractsSQLandautomatesdatabaseoperations,makingitidealforrapiddevelopmentandobject-orienteddesigns,whileMyBatisisaSQLmapperthatgivesfullcontroloverqueries,suitingperformance-criticalandcomplexSQLscenarios;2.H

Jul 24, 2025 am 03:01 AM

Understanding Java Thread Dump Analysis

Java thread dump is a key tool for troubleshooting performance issues, deadlocks and blocking problems, recording the status and call stack of all threads at a certain moment in the JVM. The acquisition methods include: 1. Use jstack tool to execute jstack; 2. Send SIGQUIT signals through kill-3; 3. Use graphical tools such as JVisualVM or JConsole to export; 4. Acquire through platform interface in containers or cloud environments. Thread states such as RUNNABLE, BLOCKED, WAITING, etc. can help identify problems. A large number of BLOCKED threads may indicate fierce competition in locks. Too much WAITING may mean slow task processing or unreasonable configuration. The steps for analyzing deadlock are: 1. Find BLO

Jul 24, 2025 am 02:58 AM

How to implement a singleton design pattern in Java?

TheSingletonpatterninJavacanbeimplementedusingvariousapproaches,eachwithspecificadvantages.1.Lazyinitializationwiththreadsafetyusesdouble-checkedlockingandthevolatilekeywordtoensureasingleinstanceiscreatedonlywhenneeded,idealforresource-heavyobjects.

Jul 24, 2025 am 02:53 AM

how to read a file in java line by line

To read Java files line by line, it is recommended to use BufferedReader. The steps are: 1. Introduce the BufferedReader and FileReader classes; 2. Open the file with FileReader and wrap it into a BufferedReader; 3. Use the readLine() method to loop through each line until it returns null; 4. Use try-with-resources to automatically close the resource; 5. Capture and handle possible IOExceptions. Common problems include path errors, insufficient permissions, null pointer exceptions and excessive file sizes, which need to be handled in a targeted manner. Other methods include Scanner (suitable for parsing line content) and File

Jul 24, 2025 am 02:45 AM

Reactive Programming in Java with Project Reactor

ProjectReactor is a Java library based on responsive stream specifications used to handle asynchronous data flows. Its core types are Mono and Flux. 1. Use operators such as map, flatMap, and filter for data flow conversion and processing. 2. Control data flow rate through backpressure mechanisms such as onBackpressureBuffer and onBackpressureDrop. 3. Use onErrorResume, onErrorReturn, and retry for error processing. 4. Use subscribeOn and publishOn to implement thread scheduling. 5. It is widely used in microservice asynchronous calls, event-driven architecture, real-time

Jul 24, 2025 am 02:43 AM

java programming

how to convert list to array in java

In Java, there are three main methods to convert List into arrays: 1. Use the toArray() method to pass newType[0] is more concise and type-safe; 2. You need to manually traverse the conversion for basic type arrays, such as List to int[]; 3. Use StreamAPI (Java8) to achieve more flexible conversion through stream().toArray(Type[]::new). Pay attention to the matching problem of array length and type. Different scenarios can choose the appropriate method according to Java version and requirements.

Jul 24, 2025 am 02:42 AM

How to check if an Array contains a specific value in Java?

There are three common ways to determine whether an array contains a specific value in Java. 1. Use Arrays.asList().contains(), which is suitable for object type arrays, with concise code but not for basic type arrays; 2. Iterate through the array and manually check it, which is suitable for basic type arrays, with light performance but large code volume; 3. Use HashSet to improve search efficiency, which is suitable for scenarios with large data volume and multiple searches, and initialization has performance overhead. Selection should be traded based on array type, performance requirements, and code style.

Jul 24, 2025 am 02:35 AM