CodeGym /ื‘ืœื•ื’ Java /Random-HE /5 ื˜ื™ืคื™ื ืœื”ื’ื“ืœืช ื”ืกื™ื›ื•ื™ื™ื ืฉืœืš ืœืžืฆื•ื ืขื‘ื•ื“ื” ื›ืžืชื›ื ืช
John Squirrels
ืจึธืžึธื”
San Francisco

5 ื˜ื™ืคื™ื ืœื”ื’ื“ืœืช ื”ืกื™ื›ื•ื™ื™ื ืฉืœืš ืœืžืฆื•ื ืขื‘ื•ื“ื” ื›ืžืชื›ื ืช

ืคื•ืจืกื ื‘ืงื‘ื•ืฆื”
ืฉืœื•ื ืœื›ื•ืœื! ืื ื™ ืœื ืฆืจื™ืš ืœื”ื’ื™ื“ ืœืš ื›ืžื” ืงืฉื” ืขื›ืฉื™ื• ืœื”ืฉื™ื’ ืขื‘ื•ื“ื” ื›ืžืชื›ื ืช ื›ืฉืื™ืŸ ืœืš ื ื™ืกื™ื•ืŸ. ื”ืชื—ืจื•ืช ื‘ืจืžืช "ืœืœื ื ื™ืกื™ื•ืŸ" ื’ื“ืœื” ืžืฉืžืขื•ืชื™ืช ืœืื—ืจื•ื ื” (ื‘ืขื™ืงืจ ื‘ืฉืœ ืืชืจื™ื ื›ืžื• CodeGym, ื•ืงื•ืจืกื™ื ืžืงื•ื•ื ื™ื ืื—ืจื™ื). ื”ืชื•ืฆืื” ื”ื™ื ืฉืงืฉื” ืžืื•ื“ ืœื”ืชื‘ืœื˜ ื‘ื™ืŸ ื”ืžื•ื ื™ ื”ื‘ื•ื’ืจื™ื ืฉืœ ืงื•ืจืกื™ื ืžืงื•ื•ื ื™ื ืฉื•ื ื™ื. ื•ื”ืืชื’ืจ ื”ื•ื ืœื ืœื”ืฆืœื™ื— ื‘ืจืื™ื•ืŸ ืขื‘ื•ื“ื”. ื”ืืชื’ืจ ื”ื•ื ืจืง ืœื”ื’ื™ืข ืœืจืื™ื•ืŸ ืขื‘ื•ื“ื”. ืื™ืš ื‘ื•ื’ืจ CodeGym ื™ื›ื•ืœ ืœื”ืชื‘ืœื˜ ืžื‘ื™ืŸ ืงื”ืœ ืžื—ืคืฉื™ ื”ืขื‘ื•ื“ื”? ืื ื™ ืœื ืžืชื›ื•ื•ืŸ ืœื›ืชื•ื‘ ืขืœ ื˜ื›ื ื•ืœื•ื’ื™ื•ืช ืืจื’ื•ื ื™ื•ืช ื›ืžื• Spring ื•-Hibernate, ืฉื”ืŸ ืœืœื ืกืคืง ื—ื™ื•ื ื™ื•ืช ืœืžืคืชื— Java - ื™ื”ื™ื” ืœืš ืงืฉื” ืžืื•ื“ ืœืžืฆื•ื ืขื‘ื•ื“ื” ืžื‘ืœื™ ืœื”ื›ื™ืจ ืื•ืชืŸ. ืœื”ืœืŸ 5 ื”ืžืœืฆื•ืช ืœืžืคืชื—ื™ื ืžืชื—ื™ืœื™ื ื”ืžืขื•ื ื™ื™ื ื™ื ืœืžืฆื•ื ืขื‘ื•ื“ื”. ื›ืœ ืื—ื“ ืžื”ื ื‘ื”ื—ืœื˜ ื™ืขืœื” ืืช ื”ืฆื™ื•ืŸ ืฉืœ ืงื•ืจื•ืช ื”ื—ื™ื™ื ืฉืœืš.

1. ืœืžื“ JavaScript

ื›ื™ื•ื JS ื”ื™ื ืฉืคืช ื”ืชื›ื ื•ืช ื”ืžื‘ื•ืงืฉืช ื‘ื™ื•ืชืจ ืขืœ ื™ื“ื™ ืžืขืกื™ืงื™ื. ืคื•ืจื˜ืœ HackerRank ืกืงืจ ื—ื‘ืจื•ืช ื‘ื ื•ื’ืข ืœ"Wishlist" ืฉืœื”ืŸ. JavaScript ื”ืชื‘ืงืฉ ืขืœ ื™ื“ื™ ืžืขืกื™ืงื™ื ืœืขืชื™ื ืงืจื•ื‘ื•ืช ื™ื•ืชืจ ืžื›ืœ ืฉืคื” ืื—ืจืช. 5 ื˜ื™ืคื™ื ืœื”ื’ื“ืœืช ื”ืกื™ื›ื•ื™ื™ื ืฉืœืš ืœืžืฆื•ื ืขื‘ื•ื“ื” - 2ื”ืกื™ื‘ื” ืคืฉื•ื˜ื”: ืœ-JavaScript ืื™ืŸ ื›ืจื’ืข ืืœื˜ืจื ื˜ื™ื‘ื” ืจืฆื™ื ื™ืช ืœืคื™ืชื•ื— ื—ื–ื™ืชื™. ืื ืืชื” ืฉื•ืœื˜ ื‘-JS "ื˜ื”ื•ืจ" ื•ื‘ืื—ืช ื”-frameworks ื”ืคื•ืคื•ืœืจื™ื•ืช (ื‘ืขื™ืงืจ, React ืื• Angular), ื”ืกื™ื›ื•ื™ื™ื ืฉืœืš ืœื”ื™ื•ืช ืžืชื›ื ืชื™ื ื™ื’ื“ืœื•. ืงื•ื“ื ื›ืœ, ื›ืœ ื—ื‘ืจื” ืฉืžื—ืคืฉืช ืžืคืชื— ื’'ืื•ื•ื” ืชืชืจื’ืฉ ืื ื”ืžื•ืขืžื“ื™ื ื™ื“ืขื• ื’ื JavaScript. ื”ืกื™ื‘ื•ืช ื“ื™ ืคืฉื•ื˜ื•ืช: ืคืจื•ื™ืงื˜ื™ื ื›ื•ืœืœื™ื ืœืขืชื™ื ืงืจื•ื‘ื•ืช ืžืื•ื“ ืžืฉื™ืžื•ืช ืงื˜ื ื•ืช, ืœืžืฉืœ ืชื™ืงื•ืŸ ืชื›ื•ื ื•ืช ืžืกื•ื™ืžื•ืช. "ืœื—ืฆืŸ A ืฆืจื™ืš ืœื”ื™ืงืจื B, ืœื A; ืฆืจื™ืš ืœื”ื™ื•ืช ืžืžื•ืงื ื‘ืฆื“ ืฉืžืืœ, ืœื ืžื™ืžื™ืŸ; ื•ืขืœื™ื• ืœื”ืคืขื™ืœ ืืช ืคื•ื ืงืฆื™ื™ืช X ืฉืœ ื”ืงืฆื” ื”ืื—ื•ืจื™, ืœื Y". ืื‘ืœ ื‘ืžืงืจื” ื–ื”, ื”ืชื™ืงื•ืŸ ืžืฉืคื™ืข ื”ืŸ ืขืœ ื”ืงืฆื” ื”ืื—ื•ืจื™ ื•ื”ืŸ ืขืœ ื”ืงืฆื” ื”ืงื“ืžื™. ื•ื’ื ืื ื”ืžืฉื™ืžื” ืงืœื” ื‘ืžื™ื•ื—ื“, ืœืคืชื•ืจ ืื•ืชื” ืขื“ื™ื™ืŸ ื ื“ืจืฉื™ื ืฉื ื™ ืื ืฉื™ื: ืžืคืชื— ืื—ื•ืจื™ ื•ืžืคืชื— ืงืฆื”. ืื‘ืœ ืื ืžื™ืฉื”ื• ื‘ืฆื•ื•ืช ืžื—ื–ื™ืง ื‘ืฉื ื™ื”ื (ื’ื ืื ืœื ื‘ืจืžืช ืžื•ืžื—ื”), ื ื“ืจืฉื™ื ื”ืจื‘ื” ืคื—ื•ืช ืžืฉืื‘ื™ื ืœื˜ื™ืคื•ืœ ื‘ืžืฉื™ืžื•ืช ื›ืืœื”. ืฉื ื™ืช, ืžืฉืจื•ืช ืคื ื•ื™ื•ืช ืœืžืคืชื—ื™ื ื–ื•ื˜ืจื™ื ื•ืžืชืžื—ื™ื ื ืคื•ืฆื™ื ื™ื•ืชืจ ืขื‘ื•ืจ ืžืคืชื—ื™ ื—ื–ื™ืช ืžืืฉืจ ืขื‘ื•ืจ ืขื•ืจืคื™. ื‘ืกืš ื”ื›ืœ, JS ื”ื™ื ื”ื”ื–ื“ืžื ื•ืช ื”ืจืฆื™ื ื™ืช ืฉืœืš ืœืงื‘ืœ ืืช ื”ืขื‘ื•ื“ื” ื”ืจืืฉื•ื ื” ืฉืœืš. ืงื‘ืœืช ืขื‘ื•ื“ื” ื›ืžืคืชื—ื™ Java ื”ื™ื ืคื ื˜ืกื˜ื™ืช, ื•-JS ืืฃ ืคืขื ืœื ืžื™ื•ืชืจ ืขื‘ื•ืจ ืžืคืชื—ื™ Java. ืื ืื™ื ืš ืžืฆืœื™ื— ืœื”ืฉื™ื’ ืขื‘ื•ื“ื” ื‘-Java, ื•ื–ื• ื‘ื”ื—ืœื˜ ืืคืฉืจื•ืช (ืขืจื™ื ืจื‘ื•ืช ืจื•ื•ื™ื•ืช ืœื—ืœื•ื˜ื™ืŸ ื‘ืžืฉืจื•ืช ืคื ื•ื™ื•ืช), ื™ื™ืชื›ืŸ ืฉืชื•ื›ืœ ืœื”ื™ื›ื ืก ืœ-IT ื“ืจืš ื”ื—ื–ื™ืช. ืื ื™ ื–ื•ื›ืจ ืฉืงืจืืชื™ "ืกื™ืคื•ืจ ื”ืฆืœื—ื”" ืฉืœ CodeGym ืฉื ื›ืชื‘ ืขืœ ื™ื“ื™ ืžื™ืฉื”ื• ืฉืื—ืจื™ ืฉืœืžื“ ื›ืืŸ ื ื›ื ืก ืœืคื™ืชื•ื— ื—ื–ื™ืชื™.

2. ืœืžื“ ืœื›ืชื•ื‘ ืฉืื™ืœืชื•ืช SQL

SQL ืื•ืœื™ ื ืจืื” ืœื ืคื—ื•ืช ื‘ืจื•ืจ ืž-Spring ื•-Hibernate, ืฉืœื ื›ืœืœืชื™ ื‘ืจืฉื™ืžื”. ืœืžืขืฉื”, ื™ืฉ ื”ื‘ื“ืœ: ืœืžืกืคืจ ื’ื“ื•ืœ ืฉืœ ืžืคืชื—ื™ื ื™ืฉ ื™ื“ืข ืฉื˜ื—ื™ ื‘ืฉืื™ืœืชื•ืช SQL: ื”ื ื™ื›ื•ืœื™ื ืœื›ืชื•ื‘ "SELECT * FROM table_name", ืื• ืœื”ืฆื˜ืจืฃ ืœื›ืžื” ื˜ื‘ืœืื•ืช. ืื ื™ ืžืžืœื™ืฅ ืœืš ืœืฉืœื•ื˜ ื‘ื”ื ื‘ื™ืกื•ื“ื™ื•ืช, ื•ืืœ ืชืชื‘ื™ื™ืฉื• ืœืฆื™ื™ืŸ ื–ืืช ื‘ืงื•ืจื•ืช ื”ื—ื™ื™ื ืฉืœื›ื. ื‘ืขื‘ืจ, ืœื›ืžื” ืžืขืžื™ืชื™ื™ ื”ื™ื• ืขื‘ื•ื“ื•ืช ืฉื‘ื”ืŸ ื ืืœืฆื• ืœื›ืชื•ื‘ ื”ืจื‘ื” ืฉืื™ืœืชื•ืช SQL. ื›ืฉื”ื—ืœื™ื˜ื• ืœืขื‘ื•ืจ ืœืคื™ืชื•ื— Java, ื”ื›ื™ืฉื•ืจื™ื ื”ืœืœื• ื”ืคื›ื• ืื•ืชื ืœืื˜ืจืงื˜ื™ื‘ื™ื™ื ืžืื•ื“. ื•ื‘ืžืคืชื— Java, ื›ืžื•ื‘ืŸ, ื–ื• ืžื™ื•ืžื ื•ืช ืฉื™ืžื•ืฉื™ืช ืžืื•ื“. ืื ื™ ืคื•ื ื” ืืœื™ื”ื ื‘ืงื‘ื™ืขื•ืช ืœื˜ื™ืคื™ื :) ืืคืฉืจ ืœื”ืชื—ื™ืœ ื‘ืงืจื™ืืช "SQL ืจืืฉ ืจืืฉื•ืŸ". ืื– ืคืฉื•ื˜ ื‘ื—ืจ ื‘ืื—ื“ ืž-DBMSs ื”ืคื•ืคื•ืœืจื™ื™ื (Portgres ืื• Oracle, ืœืžืฉืœ) ื•ืงืจื ืขืœื™ื• ื›ืžื” ืกืคืจื™ื.

3. ืฆื•ืจ ืคืจื•ืคื™ืœ GitHub

ืœืื—ืจ ืงื•ืจื•ืช ื”ื—ื™ื™ื ืฉืœืš, ืคืจื•ืคื™ืœ GitHub ืฉืœืš ื”ื•ื ืื•ืœื™ ื”ื“ื‘ืจ ื”ื—ืฉื•ื‘ ื‘ื™ื•ืชืจ ืฉืžืขืกื™ืง ืคื•ื˜ื ืฆื™ืืœื™ ื™ืฉื™ื ืœื‘ ืืœื™ื•. ืคืจื•ืคื™ืœ ืขื ืžืกืคืจ ืคืจื•ื™ืงื˜ื™ื ืขื•ื‘ื“ื™ื ื‘ื”ื—ืœื˜ ื™ืžืฉื•ืš ืชืฉื•ืžืช ืœื‘ ื ื•ืกืคืช. ื™ืชืจื” ืžื›ืš, "ืžื ืชื—ื™ GitHub" ื”ื•ืคื›ื™ื ืคื•ืคื•ืœืจื™ื™ื ื™ื•ืชืจ ื•ื™ื•ืชืจ ื‘ืงืจื‘ ืžื’ื™ื™ืกื™ื. ืืœื• ืชื•ื›ื ื•ืช ืžื™ื•ื—ื“ื•ืช ืฉืกื•ืจืงื•ืช ืืช ื”ืงื•ื“ ื”ืžืื•ื—ืกืŸ ื‘-GitHub ื‘ืžื˜ืจื” ืœืขื–ื•ืจ ืœื—ื‘ืจื•ืช ืœืžืฆื•ื ืžืคืชื—ื™ื ืขื ืžื—ืกื ื™ืช ื”ื˜ื›ื ื•ืœื•ื’ื™ื” ื”ื ื›ื•ื ื”. ืื ื”ื ืฆืจื™ื›ื™ื ืžื™ืฉื”ื• ืฉืžื›ื™ืจ ืืช Spring Security, ื”ืชื•ื›ื ื™ืช ื–ื•ื—ืœืช ืขืœ GitHub, ื‘ื•ื—ืจืช ืžืฉืชืžืฉื™ื ืฉื”ืžืื’ืจื™ื ืฉืœื”ื ืžื›ื™ืœื™ื ืงื•ื“ ืฉืžืฉืชืžืฉ ื‘ื˜ื›ื ื•ืœื•ื’ื™ื” ื”ื–ื•. ื‘ื”ืชื—ืœื”, ื‘ืจื•ืจ ืฉืœื ื™ื”ื™ื” ืœืš ืžืฉื”ื• ืžื™ื•ื—ื“ ืœื”ืชืคืืจ ื‘ื•, ืื‘ืœ ืืชื” ื™ื›ื•ืœ ืœื”ืชื—ื™ืœ ืœืžืœื ืืช ื”ืคืจื•ืคื™ืœ ืฉืœืš ื‘"ืžืฉื™ืžื•ืช ื”ื’ื“ื•ืœื•ืช" ืฉืœ CodeGym. ืื ืœืžื“ืช ืืช ReactJS/AngularJS ื•ื™ืฆืจืช ื›ืžื” ื™ื™ืฉื•ืžื™ื ื‘ื ื™ ืขืžื•ื“ ืื—ื“, ืฉื™ื ื’ื ืื•ืชื ืฉื ืœืžืขืœื”. ื›ืœ ืžื” ืฉื™ืฆืจืช ืขื•ื‘ื“ ื•ืžืขืกื™ืง ืขืฉื•ื™ ืœื”ื™ื•ืช ืžืขื•ื ื™ื™ืŸ ืœื‘ื“ื•ืง ืืช ืคืจื•ืคื™ืœ GitHub ืฉืœืš.

4. ืงื‘ืœ ื”ืกืžื›ื” ืฉืœ ืื•ืจืงืœ

ื”ื™ื•ืฆืจื™ื ืฉืœ CodeGym ืœื ื™ืชื ื• ืœื™ ืœืฉืงืจ ืœืš: ื”ืฉืืœื” ื”ื ืคื•ืฆื” ื‘ื™ื•ืชืจ ืฉื”ื ืžืงื‘ืœื™ื ืžืกื˜ื•ื“ื ื˜ื™ื ืคื•ื˜ื ืฆื™ืืœื™ื™ื ื”ื™ื "ื”ืื ืืชื” ืžืกืคืง ืชืขื•ื“ื” ื›ืœืฉื”ื™ ื›ืฉืื ื™ ืžืกื™ื™ื ืืช ื”ืœื™ืžื•ื“ื™ื?" ื”ื ืœื ืžื—ืœืงื™ื ืชืขื•ื“ื•ืช Java ืžืกื™ื‘ื” ืคืฉื•ื˜ื”: ืžืขืกื™ืงื™ื ืœื ืžืขื•ื ื™ื™ื ื™ื ื‘ื”ื. ื”ื ืžืกื•ื’ืœื™ื ืœื—ืœื•ื˜ื™ืŸ ืœืืžืช ืืช ืžื” ืฉืืชื” ื™ื•ื“ืข ื•ืžื” ืืชื” ื™ื›ื•ืœ ืœืขืฉื•ืช ื‘ืžื”ืœืš ืจืื™ื•ืŸ, ืœืœื ืื™ืฉื•ืจื™ื ืžืงื•ืจืกื™ื ืžืงื•ื•ื ื™ื. ืขื ื–ืืช, ืชืขื•ื“ื” ืžืื•ืจืงืœ ืฉื•ื ื” ื‘ื›ืš ืฉื”ื™ื ืื™ืฉื•ืจ ืจืฉืžื™ ืžื”ื™ื•ืฆืจื™ื ืฉืœ Java ืฉืืชื” ืฉื•ืœื˜ ื‘ืฉืคื”. ื”ืกืžื›ื” ื›ื–ื• ื”ื™ื ื™ืชืจื•ืŸ ืจืฆื™ื ื™ ืœืกืคืงื™ ืžื™ืงื•ืจ ื—ื•ืฅ, ื›ืœื•ืžืจ ื”ืื ืฉื™ื ืฉ"ืžืฉื›ื™ืจื™ื" ืืช ื”ืžืคืชื—ื™ื ืฉืœื”ื ืœื—ื‘ืจื•ืช ืื—ืจื•ืช ื›ื“ื™ ืœืขื‘ื•ื“ ืขืœ ืคืจื•ื™ืงื˜ื™ื ื—ื™ืฆื•ื ื™ื™ื. ืœื“ื•ื’ืžื”, ื ื ื™ื— ืฉื‘ื ืง ื›ืœืฉื”ื• ืฆืจื™ืš ืœื™ืฆื•ืจ ืœืงื•ื— ืื™ื ื˜ืจื ื˜ ื—ื“ืฉ. ืฉืžื™ืจื” ืขืœ ืขื“ืช ืžืคืชื—ื™ื ืคื ื™ืžื™ืช ืžืฉืœื” ืœืฉื ื›ืš ืื™ื ื” ืจื•ื•ื—ื™ืช - ืขื‘ื•ืจ ืคืจื•ื™ืงื˜ ื—ื“ ืคืขืžื™, ืงืœ ื™ื•ืชืจ ืœืžืฆื•ื ืฆื•ื•ืช ื—ื™ืฆื•ื ื™. ื‘ืžืงืจื™ื ื›ืืœื”, ืขืกืงื™ื ืคื•ื ื™ื ืœืกืคืง ืžื™ืงื•ืจ ื—ื•ืฅ. ื”ื ื™ืขืกื™ืงื• ืื ืฉื™ื ืขื ื”ื›ื™ืฉื•ืจื™ื ื”ื ื“ืจืฉื™ื ืขืœ ื™ื“ื™ ื”ื‘ื ืง ื•ื™ืจื›ื™ื‘ื• ืฆื•ื•ืช. ืขื ื–ืืช, ื”ืœืงื•ื— ื—ื™ื™ื‘ ืœื”ื‘ื™ืŸ ืฉื”ื•ื ื™ืฉืœื (ื”ืจื‘ื”) ืขื‘ื•ืจ ืžืคืชื—ื™ื ื—ื›ืžื™ื ื‘ืืžืช. ื–ื” ื”ืžืงื•ื ืฉื‘ื• ื”ืกืžื›ืช ืื•ืจืงืœ ืชื”ื™ื” ื”ื™ืชืจื•ืŸ ืฉืœืš. ืื—ืจื™ ื”ื›ืœ, ื–ื• ื”ื“ืจืš ื”ื™ื—ื™ื“ื” ืœืืฉืจ ืขื ืคื™ืกืช ื ื™ื™ืจ ืฉืžืชื›ื ืช ื’'ืื•ื•ื” ืžื•ืกืžืš. ื‘ืžื™ืœื™ื ืื—ืจื•ืช, ืกืคืง ืžื™ืงื•ืจ ื—ื•ืฅ ื™ื›ื•ืœ ื”ืจื‘ื” ื™ื•ืชืจ ื‘ืงืœื•ืช "ืœืžื›ื•ืจ" ืžืคืชื— ืžื•ืกืžืš ืœืœืงื•ื—ื•ืชื™ื•. ืื™ืฉื•ืจื™ ืื•ืจืงืœ ืžื’ื™ืขื™ื ื‘ื›ืžื” ืฉื›ื‘ื•ืช. ื”ืฉื’ืช ื”ืจืžื” ื”ืจืืฉื•ื ื” (OCAJP8) ืชื”ื™ื” ืงืœื” ืžืื•ื“. ื‘ื‘ื—ื™ื ื” ื™ืฉ ืฉืืœื•ืช ืขืœ 8 ื ื•ืฉืื™ื ื‘ืœื‘ื“:
  • Java Basics (ืžืฉืชื ื™ื, ื—ื‘ื™ืœื•ืช, ืฉื™ื˜ืช main() ื•ื›ื•');
  • ืขื‘ื•ื“ื” ืขื ืกื•ื’ื™ ื ืชื•ื ื™ื ืฉืœ Java (ืคืจื™ืžื™ื˜ื™ื‘ื™ื, ื”ืคื ื™ื•ืช, ืขื˜ื™ืคื•ืช);
  • ืฉื™ืžื•ืฉ ื‘ืื•ืคืจื˜ื•ืจื™ื ื•ื‘ืžื‘ื ื™ ื”ื—ืœื˜ื” (+-*/, if-else, switch ื•ื›ื•');
  • ืฉื™ืžื•ืฉ ื‘-Loop Constructs (ืœื•ืœืื•ืช);
  • ืขื‘ื•ื“ื” ืขื ืฉื™ื˜ื•ืช ื•ืื ืงืคืกื•ืœืฆื™ื” (ืฉื™ื˜ื•ืช, ืื ืงืคืกื•ืœืฆื™ื”);
  • ืขื‘ื•ื“ื” ืขื ื™ืจื•ืฉื” (ื™ืจื•ืฉื”);
  • ื˜ื™ืคื•ืœ ื‘ื—ืจื™ื’ื™ื;
  • ืขื‘ื•ื“ื” ืขื ืžื—ืœืงื•ืช ื ื‘ื—ืจื•ืช ืž-Java API (ืžื—ืœืงื•ืช ืคื•ืคื•ืœืจื™ื•ืช ื›ื’ื•ืŸ LocalDateTime, ArrayList, String).
ืื™ืŸ ื ื•ืฉืื™ื ืžืกื•ื‘ื›ื™ื ื›ืžื• ืจื™ื‘ื•ื™ ืฉืจืฉื•ืจื™ื, IO/NIO ื•ื›ื“ื•ืžื”. ื”ื›ื™ืกื•ื™ ืฉืœ ื ื•ืฉืื™ื ืจื‘ื™ื ืžื•ื’ื‘ืœ (ืœื“ื•ื’ืžื”, ืžื›ืœ ื”ื”ื˜ืžืขื•ืช ืฉืœ List<> , ื™ืฉ ืจืง ืฉืืœื•ืช ืœื’ื‘ื™ ArrayList<> ). ื‘ื—ื™ื ืช ื”ื”ืกืžื›ื” ืขื•ืœื” ื›ืขืช 150 ื“ื•ืœืจ.

5. ื”ืฉืชืชืคื• ื‘ืงื”ื™ืœื•ืช ืžืงืฆื•ืขื™ื•ืช

ื›ืžื—ืฆื™ืช ืžื”ืžืขืกื™ืงื™ื ืžืขื•ื ื™ื™ื ื™ื ื‘ื”ืฉืชืชืคื•ืช ื”ืžื•ืขืžื“ื™ื ื‘ืงื”ื™ืœื•ืช ืžืงืฆื•ืขื™ื•ืช. ื”ืขื™ืงืจื™ (ืžืœื‘ื“ GitHub, ืฉื”ื•ื–ื›ืจ ืงื•ื“ื ืœื›ืŸ) ื”ื•ื Stack Overflow. ืœื›ืŸ, ืื ืืชื ืžืคื™ืฆื™ื ืคืจื•ื™ืงื˜ ืžื™ื ื™ ื›ืœืฉื”ื•, โ€‹โ€‹ืืœ ืชื”ืกืกื• ืœืฉืชืฃ ืื•ืชื• ืขื ื”ืงื”ื™ืœื”. ื .ื‘. ื”ืขื•ืœื ืžืฉืชื ื” ื›ืœ ื”ื–ืžืŸ, ื•ืชื—ื•ื ื”-IT ืื™ื ื• ื™ื•ืฆื ืžืŸ ื”ื›ืœืœ. ื–ื” ื“ื™ ืงืฉื” ืœืžืฉื•ืš ืืช ืชืฉื•ืžืช ื”ืœื‘ ืฉืœ ื”ืžืขืกื™ืง ืœืœื ื ื™ืกื™ื•ืŸ. ืื ื™ ืžืงื•ื•ื” ืฉื”ื˜ื™ืคื™ื ืœืขื™ืœ ื™ืขื–ืจื• ืœื›ืžื” ืž"ื—ื‘ืจื™ ืœื›ื™ืชื”" ืฉืœื™ ื‘-CodeGym ืœื”ืฉื™ื’ ืืช ื”ืขื‘ื•ื“ื” ื”ืจืืฉื•ื ื” ืฉืœื”ื :)
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