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Java for Data Science: Libraries and Use Cases

Javaisapracticalchoicefordatascienceinenterpriseandlarge-scaleenvironments.1.ApacheCommonsMathprovidesmathematicalandstatisticaltoolsforcustomalgorithms.2.WekaoffersacomprehensivesuiteofMLalgorithmsandGUItools,idealforprototyping.3.DL4Jenablesdeeplea

Jul 31, 2025 am 08:10 AM

Cloud-Native Java Applications with Quarkus

Quarkusisidealforcloud-nativeJavaapplicationsduetoitscontainer-firstdesign,enablingfaststartup,lowmemoryusage,andseamlessKubernetesandserverlessintegration.1.Itusesbuild-timeoptimizationtominimizeruntimeoverhead.2.NativeimagesupportviaGraalVMdelivers

Jul 31, 2025 am 08:06 AM

java Quarkus

Advanced Spring Data JPA for Java Developers

The core of mastering Advanced SpringDataJPA is to select the appropriate data access method based on the scenario and ensure performance and maintainability. 1. In custom query, @Query supports JPQL and native SQL, which is suitable for complex association and aggregation operations. It is recommended to use DTO or interface projection to perform type-safe mapping to avoid maintenance problems caused by using Object[]. 2. The paging operation needs to be implemented in combination with Pageable, but beware of N 1 query problems. You can preload the associated data through JOINFETCH or use projection to reduce entity loading, thereby improving performance. 3. For multi-condition dynamic queries, JpaSpecifica should be used

Jul 31, 2025 am 07:54 AM

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Understanding Java Concurrency Locks and Latches

Lock is used to protect shared resources and ensure thread safety; Latch is used to coordinate thread execution order and wait for events to complete. 1. Lock, such as ReentrantLock, controls resource access through lock() and unlock(), supports attempts to add locks, timeouts, etc., which is suitable for scenarios where high concurrency requires fine control; 2. Latch, such as CountDownLatch, implements thread waiting through countDown() and await(), which is suitable for scenarios where multiple thread tasks are started and waits for them to complete before continuing to execute; 3. Use Lock to manually release the lock to avoid deadlocks, and use Latch to ensure that the counter is zeroed to prevent blockage. The two are designed to be different and are often used together

Jul 31, 2025 am 07:45 AM

Introduction to Machine Learning with Java

Javaisaviableandpracticalchoiceformachinelearning,especiallyinenterpriseenvironments.1)Javaoffersperformance,scalability,andseamlessintegrationwithexistingsystems,makingitidealforlarge-scaleandlow-latencyapplicationslikefrauddetection.2)Keylibrariess

Jul 31, 2025 am 07:43 AM

Modern Java Development with Visual Studio Code

VSCodeisapowerful,lightweightalternativeformodernJavadevelopment.1.SetupJavabyinstallingJDK11 ,VSCode,andtheJavaExtensionPackforfulltoolingsupport.2.Benefitfromintelligentcodeediting,real-timeerrorchecking,refactoring,andseamlessMaven/Gradleintegrati

Jul 31, 2025 am 07:23 AM

A Guide to Test-Driven Development (TDD) in Java

TDDinJavafollowsthered-green-refactorcycle:firstwriteafailingtest,thenimplementminimalcodetopassit,andfinallyrefactorwhilemaintainingtestcoverage.Forexample,whenbuildingaCalculatorclass,startbywritingatestfortheadd()methodthatfails(Red),implementthem

Jul 31, 2025 am 06:48 AM

java tdd

Advanced Java Performance Tuning and Profiling

Useprofilingtoolslikeasync-profiler,JProfiler,orJVMbuilt-intools(jstat,jstack,jmap)togatheraccurateperformancedatawithminimaloverhead.2.AnalyzegarbagecollectionpatternsusingGClogsandtoolslikeGCViewer;switchtoZGCorShenandoahforsub-10mspausesifonJDK11

Jul 31, 2025 am 06:36 AM

The Best IDEs and Tools for Modern Java Development

IntelliJIDEAisthetopchoiceforJavadevelopmentduetoitssmartcodecompletion,deepframeworkintegration,androbustrefactoringtools,withtheCommunityEditionsuitableforpureJavaandUltimateofferingenterprisefeatures.2.Eclipseremainsastrong,freealternative,especia

Jul 31, 2025 am 06:33 AM

Batch Processing Large Datasets with Spring Batch and Java

Using block-based processing (core concept), 1,000 records are processed at a time to balance memory and performance; 2. Optimize ItemReader, and the database uses cursors or paging reading to avoid memory overflow; 3. Enable fault tolerance mechanism, set retry and skip strategies to ensure that tasks can be recovered; 4. Monitor performance and tune, use SpringBootActuator to track job status and adjust the block size according to write speed - these steps together to ensure that large-scale data is safe and efficient batch processing is completed.

Jul 31, 2025 am 06:26 AM

Java Interview Questions for Senior Engineers

SeniorJavainterviewstestdeepexpertiseinJVMinternals,concurrency,performance,andsystemdesign.1.UnderstandJVMmemorymodel,GCgenerations,classloading,andusetoolslikejmapandVisualVMtodiagnosememoryissues.2.Masterconcurrencybeyondsynchronized—knowReentrant

Jul 31, 2025 am 06:26 AM

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Best Practices for Writing Maintainable Java Code

Follow naming specifications to make the code as easy to read as prose; 2. The method should be small and focused, and a single responsibility is easy to test and reuse; 3. Write meaningful comments to explain "why", rather than obvious operations; 4. Prioritize immutability and packaging to prevent external accidental modifications; 5. Exceptions should be properly handled without ignoring and providing clear information; 6. Unit tests should be clearly named and cover key paths; 7. Reasonable use of modern Java features such as var and Stream to improve readability; 8. Organization of package structures layered by functions to improve project navigation efficiency - these practices jointly ensure that Java code is maintained for a long time.

Jul 31, 2025 am 06:21 AM

java Code maintenance

How to Profile and Tune a Java Application's Startup Time

First use java-Xlog:startuptime and other JVM flags to measure the startup time, clarify the class loading, GC pause and main() start time; 2. Then use async-profiler or JFR to generate flame graphs to locate hot spots such as Springrefresh() or ClassLoader.defineClass; 3. Optimize for bottlenecks: streamline the dependency and enable CDS to reduce the time-consuming class loading, configure Spring lazy loading and eliminate useless automatic configuration, avoid running-time resource scanning, and close the C2 compiler or use GraalVMAOT if necessary; 4. Remeasure the verification effect after each adjustment to ensure that the improvement is real and effective - through measurement, analysis, optimization,

Jul 31, 2025 am 06:20 AM

How to Connect a Java Application to a PostgreSQL Database

Install and run PostgreSQL, create databases and users, and ensure the service starts; 2. Add PostgreSQLJDBC drivers through Maven, Gradle or manual; 3. Write connection code using the java.sql package, establish connections through DriverManager.getConnection() and execute SQL operations; 4. Use connection pools (such as HikariCP), securely store credentials, use try-with-resources to automatically close resources, and properly handle exceptions to improve application performance and security; ultimately ensure that Java applications can interact with PostgreSQL stably and efficiently.

Jul 31, 2025 am 06:19 AM