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Java

java?? ??

??? ??? ??? ?? ???? ??? ??

SpringBootisIdeAlicroservicesduetoAuto-configuration, SeamlessSpringCloudIntegration, EmbeddedServers, ?? insupportforrest, ??, ??? ?? ? ???? ? ??? ???? ??

Jul 27, 2025 am 02:50 AM

Apache Spark? ?? ? ??? ??? Java ??

javaistrongchoiceforbigdataprocessing whithApparkinenterpriseenvernmentsDuetoItsperformance, typeSafety, andintegrationcapabilities.1) JavaOffersLow-latencyExecutionthroughjvmoptimazationslikeJitandgarbageCollectionTuning, makingItfastershoughThanpasterSThanplestonf

Jul 27, 2025 am 02:44 AM

java spark

?? Java ?? ???? ? ???

?? ?? ??? ? ??? ??? ??? ?? Java? ?? ?? ??? ????? ?? ? ? ????. 1. ??? ? (? : FixedThreadpool, CachedThreadpool ?)? ???? ??? ???? ???? ???? ?? ?? ? ??? ?? ?? ??? ?????. 2. ?? ?? ? ??? ???? ??? ?? ??? ?? isdone (), get () ? ?? ??? ?? ?? ????? ?????. 3. CountdownLatch, Cyclicbarrier ? Semaphore? ???? ?? ??? ??? ?????, ?? ?? ??? ?? ??, ?? ?? ? ??? ?? ?? ????? ?????. 4. ??? ??? ??????

Jul 27, 2025 am 02:43 AM

executor ?? ???

??? ??? ?? Java 8 ??? ? ?? ??? ?

Lambda Expressions? ??? ?? ???? ??? ????? ????? ???? ????. ?? ??, ?? (p1, p2)-> p1.getname (). compareto (p2.getname ())? ??? ??? ???? ???? ?? :: getName? ?? ??? ???? ???? ???? ? ????. 2.StreamApi? ?? ???, ? ??, ?? ?? ? ?? ??? ?? ??? ??? ?? ??? ??? ?????. ??? "???? ??"? ??? "?? ? ?"? ???? ?????.

Jul 27, 2025 am 02:42 AM

java streams

Java ????? '???'?`synchronized '? ?????

???? ??? ??? ??? ??? ?????. ??? ? ?? ?? ? ?? ?? ???? ??? ?????? ?????. 1. ?? ??? ? ???? ?? ??? ???? ?? ?? ?? ???? ?? ??? ??; 2. ?? ?? ?? ???? ??? ? ??? ? ??; 3. ??? ????? ?? Atomicinteger? ?? ?? ??? ?? ??? ?????. ? ??? ?? ?? ? ? ??? ??? ?? ?? ??? ?? ???????.

Jul 27, 2025 am 02:42 AM

Java?? HTTP ????? ??

Java?? HTTP ??? ???? ? ?? ???? ??? ????. 1. Java? ?? ???? httpurlConnection ???? ???? ?? GET ?? ?? ??? ??????. ?? ??? ????? ?????. 2. Apachehttpclient? ??? ??? ?????, ? ??? ??? ????, ?????? ??? ????? ?????. 3. OKHTTP? ???? ???? ??? ??????. API? ???? ?? ???? ???? ?? ???? ?? ???? ??? ?????. ???? ??? ?? ??? ??? ??????.

Jul 27, 2025 am 02:40 AM

JMH (Java Microbenchmark Harness)? Java ?? ????

JVM ??? ???? (? : Dead Code ??, JIT ???)? ??? ???? ??; 1. 2. @Benchmark ??? ???? ??? ??? ???? ?? ?? ???? ??? ????? ??????. 3. @benchmarkmode, @warmup, @measurement, @fork, @state ? ?? ??? ???? ??? ??? ????? ??????. 4. ??? ?? ?? ??? ?? JMH? ???? ?? ?? ???? ??? ?? ??? ???? ??? ? ??? ??????.

Jul 27, 2025 am 02:40 AM

??? ?? ? ? ??? ??? Java ??

javaisnottheprimarylarylarylorgexplorationaldatasciencebutplaysacriticalroleinbigdataandenterpriseanalytics.1.majorframeworks likehadoop, spark, kafka ? andflinkarebuiltonorcompatible, withthejvm, javaessentialforlarge-scaledappersocesing

Jul 27, 2025 am 02:37 AM

??? ???? ?? Java ??

javarecordsareidealeformodelingimmutabledata, astheyautomicallygenerateconstructors, ???, ???, ?? ?? ? ?? ?? ??, immutability ? safedatacharrierspectfordtos, configgaturationder, safedatacharrierspectordertos, recordsprovidetransparent

Jul 27, 2025 am 02:34 AM

Java ?? ?????? ?????? ?? ?? ???

UseConnectionPoolingwithHikArictoreUsedAabaseConnectionsAndUceOverHead.2.usepRepRedStatementTopReventSQlinejectAndimProveQueryPerformance.3.fetchOnlyRequiredDatabySelectingSpecificColumnSandApplyingFilterSandPagination.4.useBatchOperationStor

Jul 27, 2025 am 02:32 AM

java ??? ???

Java ? Graalvm : ?? ???? ?? ?? ???

Java? JVM ???? ???? ?? Graalvm? ???? ?? ?? ??? ??? ? ????. 1. AoT ???? ???? Java Bytecode? ?? ?? ??? ?????. 2. ?? ??? ?? ?? ?? ???? ??? ???? ? 50MB? ??? ?? ??? ??? ? ??? ?????. 3. Maven ?? SpringBoot3? ?? ???? ?? ???? ????? Graalvm? ???? ?? ??? ??? ??????. 4. ?? ? ?? ???? ?? ??? ?? ? ?????????. ?? JNI ? ?? ??? ???? ???, ?? ??? ?? ???? ?????. 5. ???? ???, ???? ? CLI ??? ??? SPR? ?????.

Jul 27, 2025 am 02:30 AM

Java ? Spring Cloud Gateway? API ????? ??

Java ?? API ?????? ????? SpringCloudgateway? ???? ?? ????? ?? ??? ??????. 1. SpringInitializr? ?? ????? ??? WebFlux, Gateway, EureKaclient ? Actuator ???? ?????. 2. application.yml?? ??? ??? ???? ?? URI ?? Eureka ?? ??? ?? ?? ???? ?????. 3. ?? ??? ???? JWT ??? ???? Redis? ?? ?? ??? ???? IP ? ?? 10 ?? ?? ? 20 ?? ???? ?????. 4. Resilience 4J ?? ?? ???? ???? ?? ?? ???? ??? ?????.

Jul 27, 2025 am 02:25 AM

Java ??? ??? ? ??? ?? ?? ???

TheJavaMemoryModel (JMM)? guaranteesinmultithreadedprograms; 1. theHappens-beforeRelationshipensUresThatHitHatWritSwritSwritSwritSwritesHatWritSwrIteSwroutShroughRoughroughroughlikeProgramorder, MoniterLocks, VolatileVariable, ThreadStart/Join, a

Jul 27, 2025 am 02:22 AM

??? ????? Java ??? API? ?? ?? ???

javastreamsapienablestfunctional-styledataprocessingbycreatingstreamstreamsfrom collections, ??, ?? ??, ??, intermediateoperations like-ransformdatalazily, count, count, orfirstttopresseres

Jul 27, 2025 am 02:16 AM