CodeGym /ื‘ืœื•ื’ Java /Random-HE /ืื™ืš ืœืคืฆื— ืจืื™ื•ืŸ ื’'ืื•ื•ื”? ื”ืžืฉืื‘ื™ื ื”ื˜ื•ื‘ื™ื ื‘ื™ื•ืชืจ ืฆื•ืžืฆืžื•
John Squirrels
ืจึธืžึธื”
San Francisco

ืื™ืš ืœืคืฆื— ืจืื™ื•ืŸ ื’'ืื•ื•ื”? ื”ืžืฉืื‘ื™ื ื”ื˜ื•ื‘ื™ื ื‘ื™ื•ืชืจ ืฆื•ืžืฆืžื•

ืคื•ืจืกื ื‘ืงื‘ื•ืฆื”
ืฉืœื•ื ื›ื•ืœื! ืื ืืชื” ืžื›ื•ื•ืŸ ืœืจืื™ื•ืŸ/ื™ื ืฉืœ ืžืคืชื—ื™ Java ืื‘ืœ ืืชื” ืžื‘ื•ืœื‘ืœ ืœื’ื‘ื™ ืื™ืš ืœื”ื›ื™ืŸ ืืช ืขืฆืžืš ืœืจืื™ื•ื ื•ืช Java, ืืชื” ื‘ืžืงื•ื ื”ื ื›ื•ืŸ. ืžื“ืจื™ืš ืงืฆืจ ื–ื” ื™ื›ื•ืœ ืœืขื–ื•ืจ ืœืš ืœืฉื ื•ืช ืืช ืฉืืœื•ืช ื”ืจืื™ื•ื ื•ืช ื”ืคื•ืคื•ืœืจื™ื•ืช ื‘ื™ื•ืชืจ ืœืžืชื—ื™ืœื™ื ื•ืœืžื•ืžื—ื™ื, ื”ื ืฉืืœื•ืช ื‘ืกื˜ืืจื˜-ืืคื™ื ืงื˜ื ื™ื ื•ื‘ืชืื’ื™ื“ื™ื ื’ื“ื•ืœื™ื. ืื™ืš ืœืคืฆื— ืจืื™ื•ืŸ ื’'ืื•ื•ื”?  ื”ืžืฉืื‘ื™ื ื”ื˜ื•ื‘ื™ื ื‘ื™ื•ืชืจ ื”ืฆื˜ืžืฆืžื• - 1

ืฉืืœื•ืช ืœื™ื‘ื” ืฉืœ Java

ืžื™ื“ ื‘ื”ืชื—ืœื”, ืื ื—ื ื• ืจื•ืฆื™ื ืœื”ื–ื›ื™ืจ ืฉื”ืžื“ืจื™ืš ื”ื–ื” ืžืชื—ื™ืœ ื‘ืฉืืœื•ืช ืœื™ื‘ื” ื‘ืกื™ืกื™ื•ืช ืฉืœ Java ื•ืื– ืžืชืงื“ื ืœืขื‘ืจ ื ื•ืฉืื™ื ืžืชืงื“ืžื™ื ื™ื•ืชืจ. " ืœืžื” ืœื—ื›ื•ืช? " ื”ื™ื ืื—ืช ื”ืฉืืœื•ืช ื”ืžืจื›ื–ื™ื•ืช ืฉืงื•ืคืฆื•ืช ืœืจืืฉ ืฉืœ ื›ืœ ืคื•ื ื”. ืฉื™ื ืœื‘ ืฉืจืื™ื•ื ื•ืช ื’'ืื•ื•ื” ืฉื•ื ื™ื ื‘ื“ืจืš ื›ืœืœ ืžืจืื™ื•ื ื•ืช ืชื›ื ื•ืช ืžืกื•ืจืชื™ื™ื. ื’'ืื•ื•ื” ื”ื™ื ืื•ืงื™ื™ื ื•ืก โ€‹โ€‹ืฉืœ ืžื•ืฉื’ื™ื, ืื– ื”ื™ื• ืžื•ื›ื ื™ื ืฉืจืื™ื•ื ื•ืช ื’'ืื•ื•ื” ืขืฉื•ื™ื™ื ืœื›ืกื•ืช ืฉืคืข ืฉืœ ืฉืืœื•ืช ืฉื•ื ื•ืช. ื‘ืชื•ืจ ื‘ื—ื•ืจ ืจืขื ืŸ ื™ื•ืชืจ, ืืชื” ืขืฉื•ื™ ืœืฉืื•ืœ ืฉืืœื•ืช ื”ืงืฉื•ืจื•ืช ืœื™ืกื•ื“ื•ืช Java ื›ืžื• ืื•ืกืคื™ื, ืžื—ืจื•ื–ืช, hashcode, API ื•-OOPs. ืœื™ืชืจ ื“ื™ื•ืง, ืกื‘ื™ืจ ืœื”ื ื™ื— ืฉืชืชืงืœื• ื‘ื ื•ืฉืื™ื ื”ื‘ืื™ื:
  • ื™ืกื•ื“ื•ืช ื’'ืื•ื•ื”
  • ืžื‘ื ื” ื ืชื•ื ื™ื ื•ืืœื’ื•ืจื™ืชืžื™ื
  • ืžื•ืฉื’ื™ื ืžื•ื ื—ื” ืขืฆืžื™ื
  • ื™ืกื•ื“ื•ืช ืจื™ื‘ื•ื™ ื”ืฉื—ืœื•ืช, ืžืงื‘ื™ืœื•ืช ื•ื—ื•ื˜ื™ื
  • ื”ืžืจืช ืกื•ื’ ืชืืจื™ืš ื•ืขืงืจื•ื ื•ืช ื™ืกื•ื“
  • Java Collections Framework
  • ืื™ืกื•ืฃ ื–ื‘ืœ
  • ืžึทืขึฒืจึธืš
  • ื—ื•ึผื˜
  • ืขืงืจื•ื ื•ืช ืขื™ืฆื•ื‘ ืžื•ืฆืงื™ื
  • ื“ืคื•ืกื™ ืขื™ืฆื•ื‘ GOF
  • ืฉื™ืขื•ืจ ืžื•ืคืฉื˜ ื•ืžืžืฉืง
  • ื™ืกื•ื“ื•ืช Java ืœืžืฉืœ ืฉื•ื•ื” ื•ืงื•ื“ hash
  • Generics ื•-Enum
  • Java IO ื•-NIO
  • ืคืจื•ื˜ื•ืงื•ืœื™ ืจืฉืช ื ืคื•ืฆื™ื
  • ืžื‘ื ื” ื ืชื•ื ื™ื ื•ืืœื’ื•ืจื™ืชื ื‘-Java
  • ื‘ื™ื˜ื•ื™ื™ื ืจื’ื•ืœืจื™ื™ื
  • ืคื ื™ืžื™ื•ืช ืฉืœ JVM
  • ืฉื™ื˜ื•ืช ืขื‘ื•ื“ื” ืžื•ืžืœืฆื•ืช ืฉืœ Java
  • JDBC
  • ืชืืจื™ืš, ืฉืขื” ื•ืœื•ื— ืฉื ื”
  • ืขื™ื‘ื•ื“ XML ื‘-Java
  • JUnit
  • ืฉืืœื•ืช ืชื›ื ื•ืช
ื›ืžื• ื›ืŸ, ืฉื™ืžื• ืœื‘ ืฉื”ืฉืืœื•ืช ืขืฉื•ื™ื•ืช ืœื”ืฉืชื ื•ืช ื‘ื™ืŸ ืกื•ื’ ื—ื‘ืจื” ืœืžืฉื ื”ื•. ืœื“ื•ื’ืžื”, ืื ืืชื” ืžืชื›ื•ื•ืŸ ืœืขื‘ื•ื“ ืขื ื™ื™ืฉื•ืžื™ื ืžื‘ื•ืกืกื™ ื’'ืื•ื•ื” ืžืจื•ื‘ื™-ืฉืจืฉื•ืจื™ื, ืื– ืืชื” ืฆืจื™ืš ืœืฉื™ื ื“ื’ืฉ ืขืœ ื ื•ืฉืื™ ืœื™ื‘ื” ืฉืœ Java (ืจื™ื‘ื•ื™ ืฉืจืฉื•ืจื™ื ื•ื‘ืžืงื‘ื™ืœ, ืื•ืกืคื™ื, ื’ื ืจื™ื•ืช, ืืœื’ื•ืจื™ืชืžื™ื ืฉืœ GC, ืคื ื™ืžื™ื•ืช JVM ื•-Enum). ืจื•ืฆื” ืœืงืฉื•ืจ ืืช ื—ื™ื™ืš ืขื ืืคืœื™ืงืฆื™ื•ืช Java Web Service? ืื– ื™ื“ืข ืžื•ืฆืง ืฉืœ REST, SOAP, XML ื•-JSON ื”ื•ื ื—ื•ื‘ื”. ืขื‘ื•ืจ ืžืคืชื—ื™ ืื ื“ืจื•ืื™ื“, ืื ื“ืจื•ืื™ื“ API ื”ื•ื ืงืจื™ื˜ื™. ื›ืœ ืžื” ืฉืจืง ื ืืžืจ, Core Java ื—ื™ื•ื ื™ ืœื›ืœ ืกื•ื’ ืฉืœ ืขื™ืกื•ืง. ื•ื”ืžื“ืจื™ื›ื™ื ื”ื‘ืื™ื ื™ื›ื•ืœื™ื ืœืขื–ื•ืจ ืœืš:

ืฉืืœื•ืช ืขืœ ืืœื’ื•ืจื™ืชืžื™ื ื‘-Java

ืœืื—ืจ ื”ื™ื›ืจื•ืช ืขื ื”ืžืืžืจื™ื ื”ื "ืœ, ื™ื™ืชื›ืŸ ืฉืชืชืขื ื™ื™ื ื• ื‘ืฉืืœื•ืช ื‘ื ื•ื’ืข ืœืืœื’ื•ืจื™ืชืžื™ื ื‘-Java. ืฉืืœื•ืช ืืœื’ื•ืจื™ืชื ื ืชื•ื ื™ื ื”ืŸ ื—ืœืง ื—ืฉื•ื‘ ื‘ืืžืช ื‘ื›ืœ ืจืื™ื•ืŸ ืขื‘ื•ื“ื” ื‘ืฉืคืช ืชื›ื ื•ืช, ื›ื•ืœืœ ืจืื™ื•ื ื•ืช Java. ืžื›ื™ื•ื•ืŸ ืฉืžื‘ื ื™ ื ืชื•ื ื™ื ื”ื ืžื•ืฉื’ื™ ืชื›ื ื•ืช ืžืจื›ื–ื™ื™ื, ื—ื™ื•ื ื™ ืœื›ืœ ืžื•ืžื—ื™ Java ืœื”ื›ื™ืจ ืžื‘ื ื™ ื ืชื•ื ื™ื ื‘ืกื™ืกื™ื™ื ื›ืžื• ื”ืžื—ืกื ื™ืช, ื”ืจืฉื™ืžื” ื”ืžืงื•ืฉืจืช, ื”ืชื•ืจ, ื”ืžืขืจืš, ื”ืขืฅ ื•ื”ื’ืจืฃ. ื•ืžื˜ื‘ืข ื”ื“ื‘ืจื™ื, ื›ืœ ืจืื™ื•ืŸ ืขื‘ื•ื“ื” ื‘ืชื›ื ื•ืช ืœื ื™ื”ื™ื” ืฉืœื ืœืœื ืฉืืœื•ืช ื”ื ื•ื’ืขื•ืช ืœืžื‘ื ื™ ื ืชื•ื ื™ื ื•ืืœื’ื•ืจื™ืชืžื™ื. ื›ืžื• ื›ืŸ, ืืชื” ืขืฉื•ื™ ืœืงื‘ืœ ื›ืžื” ืชืจื’ื™ืœื™ Java ื›ืžื• ื”ื—ืœืคืช ืžืกืคืจื™ื ืœืœื ืžืฉืชื ื” ื–ืžื ื™, ืฉืืœื•ืช ื›ืžื• ื”ื™ืคื•ืš ืจืฉื™ืžื” ืžืงื•ืฉืจืช/ืžืขื‘ืจ ื‘ืจืฉื™ืžื” ืžืงื•ืฉืจืช/ืžื—ื™ืงืช ืฆืžืชื™ื ืžื”ืจืฉื™ืžื” ื”ืžืงื•ืฉืจืช. ืืชื” ื™ื›ื•ืœ ื’ื ืœื”ื™ื•ืช ืžื•ื›ืŸ ืœืฆืคื•ืช ืœืฉืืœื•ืช ืœื’ื‘ื™ ืžื—ืกื ื™ืช, ืชื•ืจ, ืžืขืจืš, ืจืฉื™ืžื” ืžืงื•ืฉืจืช, ืขืฅ, ื’ืจืฃ ื•ื˜ื‘ืœืช ื’ื™ื‘ื•ื‘ ื”ืžืืžืจื™ื ื”ื‘ืื™ื ื™ื›ื•ืœื™ื ืœืขื–ื•ืจ ืœืš:

ืฉืืœื•ืช ื›ืœืœื™ื•ืช ืขืœ Java

ืžืœื‘ื“ ื”ื”ื™ื‘ื˜ื™ื ื”ื‘ืกื™ืกื™ื™ื ื›ืžื• Core Java ื•ืืœื’ื•ืจื™ืชืžื™ื, ื™ืฉ ืขื“ื™ื™ืŸ ืฉืืœื•ืช ืจื‘ื•ืช ืื—ืจื•ืช ืฉืืชื” ืขืฉื•ื™ ืœืฆืคื•ืช ืœื”ืŸ. ืœื›ืŸ ื”ืงื•ืœืงืฆื™ื” ื”ื‘ืื” ื™ื›ื•ืœื” ืœื”ื•ืขื™ืœ ืœืš:

ื˜ื™ืคื™ื ืœื‘ื•ื ื•ืก

ืฉืืœื•ืช ื”ืงืฉื•ืจื•ืช ืœื’'ืื•ื•ื” ื”ืŸ ืจืง ื—ืฆื™ ืžื”ืงืจื‘ ืฉื ื™ืฆื—. ืžื’ื™ื™ืกื™ื ืจื‘ื™ื ืžืฉืœืžื™ื ื—ืœืง ืžืฉืžืขื•ืชื™ ืœืฉืืœื•ืช ืจืื™ื•ื ื•ืช ืงืฉื•ืช ื›ื“ื™ ืœื‘ื—ื•ืŸ ืืช ื”ื›ื™ืฉื•ืจื™ื ื”ื›ืœืœื™ื™ื ื•ื”ื™ื›ื•ืœืช ืฉืœืš ืœืขื‘ื•ื“ ื‘ืฆื•ื•ืช. ืœื›ืŸ, ืื ืื™ื ืš ืจื•ืฆื” ืฉื”ืžืขืกื™ืงื™ื ื”ืคื•ื˜ื ืฆื™ืืœื™ื™ื ืฉืœืš ื™ืชืคืกื• ืื•ืชืš ื‘ืฉื•ื’ื’, ืงืจื™ืืช ื”ืžืืžืจื™ื ื”ื‘ืื™ื ื™ื›ื•ืœื” ืœื”ืฆื™ืœ ืืช ื—ื™ื™ืš ื”ืžืงืฆื•ืขื™ื™ื. ื”ื ื™ื›ื•ืœื™ื ืœืขื–ื•ืจ ืœืš ืœืœืžื•ื“ ืืช ื”ืชืฉื•ื‘ื•ืช ืœื›ืžื” ืžื”ืฉืืœื•ืช ื”ื›ื™ ืžืกื•ื‘ื›ื•ืช ืฉื ืžืฆืื• ื‘ืจืื™ื•ื ื•ืช ืขื Java, ื›ืžื• ื’ื ืœื’ืœื•ืช ื›ืžื” ืžืงื•ืจื•ืช ื ื•ืกืคื™ื ืฉื™ื›ื•ืœื™ื ืœืขื–ื•ืจ ืœืš ืœื”ืชื—ืžืฉ ื‘ื™ื“ืข ื‘ืžืœื•ืื•: ื‘ืกื•ืคื• ืฉืœ ื“ื‘ืจ, ื‘ืจืฆื•ื ื ื• ืœื”ื“ื’ื™ืฉ ืฉื–ื” ื“ื™ ื ื•ืจืžืœื™ ืœืงื‘ืœ ื“ื—ื™ื™ื” ืœืื—ืจ ื”ืจืื™ื•ื ื•ืช ื”ืจืืฉื•ื ื™ื ืฉืœืš. ืคืฉื•ื˜ ืชืŸ ืœืขืฆืžืš ื˜ืคื™ื—ื” ืขืœ ื”ืฉื›ื ื•ื ืชื— ื›ืœ ืื—ื“ ืžื”ืจืื™ื•ื ื•ืช ื”ืงื•ื“ืžื™ื ืฉืœืš ื›ื“ื™ ืœืงื‘ืœ ื™ื•ืชืจ ื”ื–ื“ืžื ื•ื™ื•ืช ืœื–ื›ื•ืช ื‘ืžืฉืจืช ื”ื—ืœื•ืžื•ืช ืฉืœืš ืœืื—ืจ ื”ืจืื™ื•ื ื•ืช ื”ืขืชื™ื“ื™ื™ื. ืขื ืจืื™ื•ื ื•ืช ื—ื“ืฉื™ื, ืืชื” ืจืง ืžืชืงืจื‘ ืœืคื•ืกื˜ ื”ื˜ื•ื‘ ื‘ื™ื•ืชืจ ืื™ ืคืขื! ืื™ืš ืœืคืฆื— ืจืื™ื•ืŸ ื’'ืื•ื•ื”?  ื”ืžืฉืื‘ื™ื ื”ื˜ื•ื‘ื™ื ื‘ื™ื•ืชืจ ืฆื•ืžืฆืžื• - 2
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