CodeGym /ื‘ืœื•ื’ Java /Random-HE /ื›ืœ ืžื” ืฉื›ื“ืื™ ืœื“ืขืช ืขืœ Java ืœืคื ื™ ืฉืชืชื—ื™ืœ ืžืกืœื•ืœ ืœืžื™ื“ื”
John Squirrels
ืจึธืžึธื”
San Francisco

ื›ืœ ืžื” ืฉื›ื“ืื™ ืœื“ืขืช ืขืœ Java ืœืคื ื™ ืฉืชืชื—ื™ืœ ืžืกืœื•ืœ ืœืžื™ื“ื”

ืคื•ืจืกื ื‘ืงื‘ื•ืฆื”
ืžื”ื ื”ื™ืชืจื•ื ื•ืช ื”ืขื™ืงืจื™ื™ื ืฉืœ ืœื™ืžื•ื“ Java? ื”ื™ื›ืŸ ื ื™ืชืŸ ืœื”ืฉืชืžืฉ ื‘ื•? ื”ืื ื’'ืื•ื•ื” ืงืฉื” ืžื“ื™ ืœืœืžื•ื“ ื‘ืขื•ื“ ืฉื ื”? ืื ืืชื” ืขื•ืžื“ ืœืœืžื•ื“ ื’'ืื•ื•ื” ื•ืœื”ืชื—ื™ืœ ืืช ื”ืงืจื™ื™ืจื” ืฉืœืš ื‘ื”, ืกื‘ื™ืจ ืœื”ื ื™ื— ืฉืืชื” ืžืชืขื ื™ื™ืŸ ื‘ื›ืœ ื”ืฉืืœื•ืช ื”ืœืœื• ื•ืจื•ืฆื” ืœื“ืขืช ื”ื›ืœ ืขืœ ื’'ืื•ื•ื”, ืžื”ืžืงื•ืจื•ืช ืฉืœื” ื•ืขื“ ืœื‘ื™ืงื•ืฉ ื•ื”ืฉื™ืžื•ืฉ ื‘ื”. ืœื”ืœืŸ, ืชืžืฆื ืืช ื”ืจืฉื™ืžื” ื”ืงืฆืจื” ืฉืœ ื”ืžืืžืจื™ื ื”ืžืงื™ืคื™ื ื‘ื™ื•ืชืจ ืขืœ Java. ื‘ื ื•ืกืฃ, ืชืงื‘ืœื• ื›ืžื” ื˜ื™ืคื™ื ื›ื™ืฆื“ ืœื”ืชื—ื™ืœ ืœืœืžื•ื“ Java. ืชื”ื ื”! ื›ืœ ืžื” ืฉื›ื“ืื™ ืœื“ืขืช ืขืœ Java ืœืคื ื™ ืฉืžืชื—ื™ืœื™ื ืžืกืœื•ืœ ืœืžื™ื“ื” - 1

ื”ื™ืชืจื•ื ื•ืช ื”ืขื™ืงืจื™ื™ื ืฉืœ ืฉืคืช ื”ืชื›ื ื•ืช Java

ืื•ืœื™ ืชื•ืคืชืขื•, ืื‘ืœ ื›ืžืขื˜ ื›ืœ ืžื” ืฉืื ื• ืžืฉืชืžืฉื™ื ื‘ื—ื™ื™ ื”ื™ื•ื-ื™ื•ื ืฉืœื ื• ืžื—ื•ื‘ืจ ื›ืขืช ืœื’'ืื•ื•ื”. ืขืœ ืคื™ ืžื“ื“ TIOBE ื”ืžืคื•ืจืกื, ื’'ืื•ื•ื” ืžืžืฉื™ื›ื” ืœื”ื—ื–ื™ืง ื‘ืขืžื“ื•ืช ืจืืฉื™ื•ืช ืฉื ื” ืื—ืจ ืฉื ื”. ืœืžืจื•ืช ืฉืคื•ืช ืชื›ื ื•ืช ื—ื“ืฉื•ืช ืจื‘ื•ืช ื”ื•ืคื™ืขื• ืœืื—ืจื•ื ื”, ื”ืชื”ื™ืœื” ืฉืœ ื’'ืื•ื•ื” ืžืขื•ืœื ืœื ื™ืจื“ื” ืžืื– "ืœื™ื“ืชื”". ื•ืื ืชืจืฆื” ืœื”ืขืžื™ืง ื‘ืžื—ื–ื•ืจ ื”ื—ื™ื™ื ืฉืœ Java, ืืชื” ืžื•ื–ืžืŸ ืœืงืจื•ื ืกื™ืคื•ืจ ืžืœื ืฉืœ ืคื™ืชื•ื— Java . ื”ืžืืžืจ ืžืกืคืจ ืขืœ ืฉื•ืจืฉื™ื•, ื”ืชืคืชื—ื•ืชื• ื•ื”ืฆืœื—ืชื•. ืžื” ื”ื•ืคืš ืืช Java ืœืื—ืช ืžืฉืคื•ืช ื”ืชื›ื ื•ืช ื”ื—ื–ืงื•ืช, ื”ื™ืขื™ืœื•ืช ื•ื”ื ืคื•ืฆื•ืช ื‘ื™ื•ืชืจ ื‘ืขื•ืœื ื”ื˜ื›ื ื•ืœื•ื’ื™ื”? ื–ื” ืงืœ ืœืœืžื™ื“ื”, ืงืœ ืœืฉื™ืžื•ืฉ, ื•ืœื›ืŸ ืงืœ ืœื›ืชื™ื‘ื”, ืงืœ ืœื”ื™ื“ื•ืจ ื•ืงืœ ืœื ื™ืคื•ื™ ื‘ืื’ื™ื. ื›ืžื• ื›ืŸ, ื–ื•ื”ื™ ืฉืคื” ืžื•ื ื—ื” ืขืฆืžื™ื, ื›ืœื•ืžืจ ื”ื™ื ืžืืคืฉืจืช ืœืš ืœื™ืฆื•ืจ ืชื•ื›ื ื™ื•ืช ืžื•ื“ื•ืœืจื™ื•ืช ื•ืงื•ื“ ืœืฉื™ืžื•ืฉ ื—ื•ื–ืจ. ื’'ืื•ื•ื” ื”ื™ื ืฉืคื” ื‘ืจืžื” ื’ื‘ื•ื”ื”, ื›ืœื•ืžืจ ื”ื™ื ื“ื•ืžื” ืžืื•ื“ ืœืฉืคื” ืื ื•ืฉื™ืช. ื‘ื ื™ื’ื•ื“ ืœืฉืคื•ืช ื‘ืจืžื” ื ืžื•ื›ื” ื”ื“ื•ืžื•ืช ืœืงื•ื“ ืžื›ื•ื ื”, ื™ืฉ ืœื”ืžื™ืจ ืฉืคื•ืช ื‘ืจืžื” ื’ื‘ื•ื”ื” ื‘ืืžืฆืขื•ืช ืžื”ื“ืจื™ื ืื• ืžืชื•ืจื’ืžื ื™ื. ื–ื” ืžืคืฉื˜ ืืช ื”ื”ืชืคืชื—ื•ืช, ื•ืžืงืœ ืขืœ ื›ืชื™ื‘ื”, ืงืจื™ืื” ื•ืชื—ื–ื•ืงื” ืฉืœ ืฉืคื”. ื•ื›ื ืจืื” ื”ื”ื˜ื‘ื” ื”ื—ื–ืงื” ื‘ื™ื•ืชืจ ื”ื™ื ืฉ "Java is Like an Air" . ืœืžืจื•ืช ืฉืœื ืชืžื™ื“ ืืคืฉืจ ืœืจืื•ืช ืืช ื–ื”, ื–ื” ื‘ื›ืœ ืžืงื•ื. ื–ื•ื”ื™ ืฉืคื” ื‘ืœืชื™ ืชืœื•ื™ื” ื‘ืคืœื˜ืคื•ืจืžื” ื”ืžืฉืžืฉืช ื‘ืกื‘ื™ื‘ื•ืช ืฉื•ื ื•ืช, ืžืžื›ืฉื™ืจื™ ืื ื“ืจื•ืื™ื“ ื•ืžื—ืฉื‘ื™ื ื•ืขื“ ืืคืœื™ืงืฆื™ื•ืช ืื™ื ื˜ืจื ื˜, ืชื•ื›ื ื•ืช, ื›ืœื™ื ืœืชืขืฉื™ื™ื” ื”ืคื™ื ื ืกื™ืช ื•ืขื•ื“. Write Once Run Anywhere (WORA) ื”ื•ื ืžืฉืคื˜ ืžื•ืฉืš ืคื•ืคื•ืœืจื™ ื”ืžืชืืจ ืืช ื”ื™ื›ื•ืœื•ืช ื—ื•ืฆื•ืช ื”ืคืœื˜ืคื•ืจืžื•ืช ืฉืœ Java. ื–ื•ื”ื™ ืฉืคื” ื‘ืœืชื™ ืชืœื•ื™ื” ื‘ืคืœื˜ืคื•ืจืžื” ืฉื™ื›ื•ืœื” ืœื ื•ืข ื‘ื—ื•ืคืฉื™ื•ืช ืžืžืขืจื›ืช ื”ืคืขืœื” ืื—ืช ืœืื—ืจืช. ื™ืชืจื•ื ื•ืช ืืœื• ื•ืื—ืจื™ื ืžืชื•ืืจื™ื ื‘ืžืืžืจ ื”ืžืงื™ืฃ ืฉืœื ื• ืžื” ื”ื•ืคืš ืืช ื’'ืื•ื•ื” ืœื›ืœ ื›ืš ื ื”ื“ืจืช? 7 ื”ื™ืชืจื•ื ื•ืช ื”ืขื™ืงืจื™ื™ื ืฉืœ Java . ื•ื‘ื›ืŸ, ืขื›ืฉื™ื• ืืชื” ื™ื•ื“ืข ืžื”ืŸ ื”ืื˜ืจืงืฆื™ื•ืช ื”ืขื™ืงืจื™ื•ืช ืฉืœ ื’'ืื•ื•ื”. ืื‘ืœ ืœืžื” ืืชื” ื™ื›ื•ืœ ืœื”ื™ื•ืช ืœืื—ืจ ื”ืฉืœืžืช ืงื•ืจืก Java ื”ืžืงื•ื•ืŸ ืฉืœื ื•, ื•ื›ืžื” ื–ืžืŸ ื–ื” ื™ื™ืงื—? ืืชื” ื‘ื˜ื— ื›ื‘ืจ ื™ื•ื“ืข ืฉื“ืจืš ืื—ืช ืขืฉื•ื™ื” ืœืงื—ืช ืื•ืชืš ืœืคื™ืชื•ื— ืื ื“ืจื•ืื™ื“. ืื ืืชื” ืžืขื•ื ื™ื™ืŸ ืœื™ืฆื•ืจ ืืคืœื™ืงืฆื™ื•ืช ืœื ื™ื™ื“, ืชื•ื›ืœ ืœื‘ืฆืข ื–ืืช ื‘ืืžืฆืขื•ืช Java. ืžืœื‘ื“ ืžืคืชื— ืื ื“ืจื•ืื™ื“, ืืชื” ืขืฉื•ื™ ืœื”ืคื•ืš ืœืžืคืชื— ืชื•ื›ื ื”, ืžื”ื ื“ืก ืชื•ื›ื ื”, ืžื”ื ื“ืก ืชื•ื›ื ื” Java, ืžืคืชื— ื™ื™ืฉื•ืžื™ื ืื• ืžื”ื ื“ืก QA. ื•ื›ืœ ื”ืžืงืฆื•ืขื•ืช ื”ืืœื” ื“ื•ืจืฉื™ื ื™ื“ืข Core Java ืฉืืชื” ื™ื›ื•ืœ ืœืงื‘ืœ ืขื CodeGym. ื•ืื ืชืจืฆื• ืœื”ื‘ื™ืŸ ื›ืžื” ื–ืžืŸ ื–ื” ื™ื™ืงื—, ืชื•ื›ืœื• ืœื”ืชื™ื™ื—ืก ืœืžืืžืจ ื”ื‘ื ืขื“ ืื™ื ืกื•ืฃ ื•ืžืขื‘ืจ: ื›ืžื” ื–ืžืŸ ืœื•ืงื— ืœืœืžื•ื“ Java? ื›ืžื•ื‘ืŸ, ื”ื–ืžืŸ ื”ื“ืจื•ืฉ ืœืจื›ื™ืฉืช ื™ื“ืข ื‘ืกื™ืกื™ ื‘ื’'ืื•ื•ื” ืชืœื•ื™ ื’ื ื‘ืฉืืœื” ืื ืชืชืžื•ื“ื“ ืขื ื›ืžื” ื‘ืขื™ื•ืช ื‘ื“ืจื›ืš ืื• ืœื. ื›ื“ื™ ืœืขื–ื•ืจ ืœืš ืœื”ื™ืžื ืข ืžื”ื, ื”ื›ื ื• ืžื“ืจื™ืš ืงืฆืจ ื ื•ืกืฃ ื ืชืงืขืช? ื”ื—ืœืงื™ื ื”ืงืฉื™ื ื‘ื™ื•ืชืจ ื‘ืœื™ืžื•ื“ ื’'ืื•ื•ื” ื•ื›ื™ืฆื“ ืœื”ืชื’ื‘ืจ ืขืœื™ื”ื .

ืœืคื ื™ ืœื™ืžื•ื“ ื’'ืื•ื•ื”...

ืืœื” ืฉืจื•ืฆื™ื ืœื”ืจืงื™ืข ืฉื—ืงื™ื ื‘ืชื”ืœื™ืš ื”ืœืžื™ื“ื” ืฉืœื”ื ืฆืจื™ื›ื™ื ืœืฉืงื•ืœ ืœืœืžื•ื“ ื›ืžื” ืชื•ืกืคื•ืช ืœืคื ื™ ืชื—ื™ืœืช ื”ืงื•ืจืก:

ื›ื™ืฆื“ ืœืืจื’ืŸ ื•ืœื‘ื ื•ืช ืืช ืชื”ืœื™ืš ื”ืœืžื™ื“ื”

ื”ืžืคืชื— ืœืœืžื™ื“ื” ืžื•ืฆืœื—ืช ื”ื•ื ืชื•ื›ื ื™ืช ืžื—ื•ืฉื‘ืช ื”ื™ื˜ื‘ ืฉื ื•ืฆืจื” ืžืจืืฉ. ืงื•ื“ื ื›ืœ, ืขืœื™ืš ืœื”ื—ืœื™ื˜ ื‘ืื™ื–ื• ืงืจื™ื™ืจื” ืชืจืฆื” ืœื”ืžืฉื™ืš ื•ืœืื—ืจ ืžื›ืŸ ืœื”ื’ื“ื™ืจ ืืช ืžืขืจืš ื”ื›ื™ืฉื•ืจื™ื ื”ืขื™ืงืจื™ ืฉืชืฆื˜ืจืš ืขื‘ื•ืจื”. ืœื“ื•ื’ืžื”, ืื ืชืจืฆื” ืœื”ื™ื•ืช ืžื•ืžื—ื” ืื ื“ืจื•ืื™ื“, ื”ืžืืžืจ ื”ื‘ื ืขืฉื•ื™ ืœื”ื™ื•ืช ืฉื™ืžื•ืฉื™ ืžืื•ื“: ืžืคืช ื“ืจื›ื™ื ืœืžืชื—ื™ืœ ื›ืžืคืชื— ืื ื“ืจื•ืื™ื“ . ืขื ื–ืืช, ืœื ืžืฉื ื” ื‘ืื™ื–ื• ืงืจื™ื™ืจื” ืชื‘ื—ืจ, ื‘ื”ื—ืœื˜ ืชืฆื˜ืจืš ืœืจื›ื•ืฉ ื›ืžื” ื›ื™ืฉื•ืจื™ื ื ื•ืกืคื™ื, ื•ื”ืžืืžืจ ืฉืœื ื• ื˜ื™ืค ืงื˜ืŸ ืœืชื•ื›ื ื™ืช ื”ื—ื™ื ื•ื›ื™ืช ืฉืœืš ืžื’ืœื” ื›ื™ืฆื“ ืœืขืฉื•ืช ื–ืืช ื ื›ื•ืŸ ื•ื‘ืื™ื–ื” ืจืฆืฃ. ื”ืื ื’'ืื•ื•ื” ื”ื•ื ืื’ื•ื– ืงืฉื” ืœืคื™ืฆื•ื— ืขื‘ื•ืจืš? ื”ื•ื ืกืงื™ืจื” ืื™ื ืคื•ืจืžื˜ื™ื‘ื™ืช ื ื•ืกืคืช ืฉืœ ืชื”ืœื™ืš ื”ืœืžื™ื“ื” ื•ื”ืฆืขื“ื™ื ืฉืขืœื™ืš ืœื ืงื•ื˜ ื›ื“ื™ ืœื”ืฆืœื™ื—. ื‘ืžืืžืจ ื–ื” ืชืžืฆื ื’ื ื›ืžื” ืžืฉืื‘ื™ื ืžื•ืขื™ืœื™ื ืฉืœ ืฆื“ ืฉืœื™ืฉื™ ืฉื™ื›ื•ืœื™ื ืœืขื–ื•ืจ ืœืš ืœื—ื–ืง ืืช ื”ื™ื“ืข ืฉืœืš. ืœื‘ืกื•ืฃ, ืื ืืชื” ื—ื•ืฉื‘ ืฉืœื™ืžื•ื“ ื’'ืื•ื•ื” ื™ื›ื•ืœ ืจืง ืœืคืชื•ื— ืฉืคืข ืฉืœ ื”ื–ื“ืžื ื•ื™ื•ืช ืงืจื™ื™ืจื”, ื‘ืจืฆื•ื ื ื• ืœื”ื‘ื˜ื™ื— ืœืš ืฉื”ื›ืจืช ื’'ืื•ื•ื” ื™ื›ื•ืœื” ืœืขื–ื•ืจ ืœืš ื‘ื”ื™ื‘ื˜ื™ื ืจื‘ื™ื ืื—ืจื™ื ืฉืœ ื—ื™ื™ ื”ื™ื•ื-ื™ื•ื ืฉืœืš ื‘ืžืืžืจ ืœืžื” ื’'ืื•ื•ื” ? ืกื™ื‘ื•ืช ืžื•ื‘ื™ืœื•ืช ืœืœืžื•ื“ Java ื’ื ืื ืืชื” ืœื ืžืชื›ื•ื•ืŸ ืœืงืฉืจ ืื•ืชื” ืœืงืจื™ื™ืจื” ืฉืœืš .

ืกื™ื›ื•ื

ื–ื” ืœื ืžืฉื ื” ืื ืืชื” ื”ื•ืœืš ืœืœืžื•ื“ ืชื›ื ื•ืช ื›ื“ื™ ืœืžืฆื•ื ืขื‘ื•ื“ื” ื‘ืฉื›ืจ ื˜ื•ื‘ ืื• ืกืชื ื‘ืฉื‘ื™ืœ ื”ื›ื™ืฃ; ื™ืฉ ื”ืจื‘ื” ืกื™ื‘ื•ืช ืœื‘ื—ื•ืจ ื‘ืฉืคืช Java. ื–ื•ื”ื™ ืฉืคื” ืžื‘ื•ืกืกืช ื‘ืจืžื” ื’ื‘ื•ื”ื” ืขื ืชื—ื‘ื™ืจ ืคืฉื•ื˜ ื™ื—ืกื™ืช ื•ืขืงื•ืžืช ืœืžื™ื“ื” ืžืชื•ื ื”. ื‘ื ื•ืกืฃ, ื”ืžื•ืฉื’ื™ื ื”ื‘ืกื™ืกื™ื™ื ืฉืœื• ืœื ืจืง ื ื™ืชื ื™ื ืœื”ืขื‘ืจื” ืœืฉืคื•ืช ืชื›ื ื•ืช ืจื‘ื•ืช ืื—ืจื•ืช ืืœื ื’ื ื ื™ืชื ื•ืช ืœื”ืขื‘ืจื” ืœืชื—ื•ืžื™ื ืจื‘ื™ื ืื—ืจื™ื ืฉืœ ื—ื™ื™ืš. ื™ื“ื™ืขืช ื’'ืื•ื•ื” ื™ื›ื•ืœื” ืœืฉืคืจ ืืช ื›ื™ืฉื•ืจื™ ืงื‘ืœืช ื”ื”ื—ืœื˜ื•ืช ืฉืœืš, ื›ื™ืฉื•ืจื™ื ื˜ื›ื ื™ื™ื, ื›ื™ืฉื•ืจื™ ืชืงืฉื•ืจืช ื•ื›ื™ืฉื•ืจื™ ื™ืฆื™ืจืชื™ื•ืช. ืฉืœื ืœื“ื‘ืจ ืขืœ ื’'ืื•ื•ื” ื”ื™ื ืื—ืช ืžืฉืคื•ืช ื”ืชื›ื ื•ืช ื”ืžื‘ื•ืงืฉื•ืช ื‘ื™ื•ืชืจ ื‘ืขื•ืœื ื‘ื–ื›ื•ืช ืžื ื˜ืจื” ืฉืœ WORA. ืžื›ืืŸ, ืงืœ ืœื”ื‘ื™ืŸ ืžื“ื•ืข ื™ืฉ ื™ื•ืชืจ ืžืชื›ื ืชื™ Java ืžื›ืœ ืกื•ื’ ืื—ืจ ืฉืœ ืžืชื›ื ืชื™ื ื‘ืขื•ืœื. ืื– ืžื” ื–ื” ืื•ืžืจ ืขื‘ื•ืจืš? ืชืžื™ื“ ืชืžืฆื ืื ืฉื™ื ื‘ืขืœื™ ื“ืขื•ืช ื“ื•ืžื•ืช ืฉื™ืขื–ืจื• ืœืš ื‘ืงืœื•ืช ื‘ืžื”ืœืš ืชื”ืœื™ืš ื”ืœืžื™ื“ื” ืฉืœืš ืื ื‘ืžืงืจื” ืชืชืงืข ื‘ืฉืœื‘ ืžืกื•ื™ื. ื•ื”ื›ื™ ื—ืฉื•ื‘, ืžื•ืžื—ื™ Java ื“ืจื•ืฉื™ื ืžืื•ื“ ื‘ื›ืœ ืจื—ื‘ื™ ื”ืขื•ืœื, ืžื” ืฉืื•ืžืจ ืฉืชืžืฆื ืขื‘ื•ื“ื” ื˜ื•ื‘ื” ื‘ืชื—ื•ื ื”-IT. ื•- CodeGym ืฉืžื— ืœืฆื™ื™ื“ ืื•ืชืš ื‘ืžืขืจืš ืžื™ื•ืžื ื•ื™ื•ืช ื’'ืื•ื•ื” ื—ื–ืง ื•ืœืขื–ื•ืจ ืœืš ืœื”ืชื‘ืœื˜ ืžื”ืžืชื—ืจื™ื.
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