{"id":3831,"date":"2026-03-23T20:10:03","date_gmt":"2026-03-23T12:10:03","guid":{"rendered":"https:\/\/www.go2posts.com\/vi\/inheritance-vs-composition-oop-guide\/"},"modified":"2026-03-23T20:10:03","modified_gmt":"2026-03-23T12:10:03","slug":"inheritance-vs-composition-oop-guide","status":"publish","type":"post","link":"https:\/\/www.go2posts.com\/vn\/inheritance-vs-composition-oop-guide\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: K\u1ebf th\u1eeba so v\u1edbi K\u1ebft h\u1ee3p \u2013 N\u00ean ch\u1ecdn c\u00e1i n\u00e0o"},"content":{"rendered":"

Thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m m\u1ea1nh m\u1ebd \u0111\u00f2i h\u1ecfi s\u1ef1 c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng v\u1ec1 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean k\u1ebft v\u1edbi nhau. Hai c\u01a1 ch\u1ebf ch\u00ednh x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y trong ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 k\u1ebf th\u1eeba v\u00e0 k\u1ebft h\u1ee3p. Hi\u1ec3u r\u00f5 nh\u1eefng kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 linh ho\u1ea1t. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 s\u1ef1 kh\u00e1c bi\u1ec7t, l\u1ee3i \u00edch v\u00e0 \u0111i\u1ec3m trao \u0111\u1ed5i c\u1ee7a t\u1eebng chi\u1ebfn l\u01b0\u1ee3c nh\u1eb1m gi\u00fap b\u1ea1n \u0111\u01b0a ra c\u00e1c quy\u1ebft \u0111\u1ecbnh ki\u1ebfn tr\u00fac s\u00e1ng su\u1ed1t.<\/p>\n

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\"Kawaii-style<\/figure>\n<\/div>\n

\ud83c\udfd7\ufe0f Hi\u1ec3u v\u1ec1 K\u1ebf th\u1eeba \ud83e\uddec<\/h2>\n

K\u1ebf th\u1eeba thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7 ph\u00e2n c\u1ea5p gi\u1eefa c\u00e1c l\u1edbp. N\u00f3 cho ph\u00e9p m\u1ed9t l\u1edbp m\u1edbi, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1edbp con ho\u1eb7c l\u1edbp con, ti\u1ebfp nh\u1eadn c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a m\u1ed9t l\u1edbp hi\u1ec7n c\u00f3, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1edbp cha ho\u1eb7c l\u1edbp si\u00eau l\u1edbp. C\u01a1 ch\u1ebf n\u00e0y th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 \u201cL\u00e0-m\u1ed9t\u201d<\/strong> m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, m\u1ed9t Car<\/code> l\u1edbp c\u00f3 th\u1ec3 k\u1ebf th\u1eeba t\u1eeb m\u1ed9t Vehicle<\/code> l\u1edbp v\u00ec m\u1ed9t chi\u1ebfc xe h\u01a1i l\u00e0<\/em> m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng.<\/p>\n

C\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i c\u1ee7a K\u1ebf th\u1eeba<\/h3>\n
    \n
  • T\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n:<\/strong> Logic chung \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a m\u1ed9t l\u1ea7n trong l\u1edbp cha, gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p.<\/li>\n
  • \u0110a h\u00ecnh:<\/strong> Cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a c\u00e1c l\u1edbp con kh\u00e1c nhau \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp si\u00eau l\u1edbp chung.<\/li>\n
  • C\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p:<\/strong> T\u1ea1o ra m\u1ed9t ph\u00e2n lo\u1ea1i r\u00f5 r\u00e0ng cho c\u00e1c kh\u00e1i ni\u1ec7m li\u00ean quan.<\/li>\n<\/ul>\n

    V\u1ea5n \u0111\u1ec1 l\u1edbp c\u01a1 s\u1edf mong manh<\/h3>\n

    M\u1eb7c d\u00f9 k\u1ebf th\u1eeba th\u00fac \u0111\u1ea9y t\u00e1i s\u1eed d\u1ee5ng, n\u00f3 l\u1ea1i t\u1ea1o ra s\u1ef1 ph\u1ee5 thu\u1ed9c. Nh\u1eefng thay \u0111\u1ed5i trong l\u1edbp cha c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh l\u00e0m h\u1ecfng c\u00e1c l\u1edbp con. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 v\u1ea5n \u0111\u1ec1 l\u1edbp c\u01a1 s\u1edf mong manh. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c cha thay \u0111\u1ed5i h\u00e0nh vi, t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con ph\u1ee5 thu\u1ed9c v\u00e0o ph\u01b0\u01a1ng th\u1ee9c \u0111\u00f3 c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i. S\u1ef1 ph\u1ee5 thu\u1ed9c ch\u1eb7t ch\u1ebd n\u00e0y khi\u1ebfn vi\u1ec7c refactoring tr\u1edf n\u00ean kh\u00f3 kh\u0103n v\u00e0 ki\u1ec3m th\u1eed tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p.<\/p>\n

    \ud83e\uddf1 Hi\u1ec3u v\u1ec1 K\u1ebft h\u1ee3p \ud83e\udde9<\/h2>\n

    K\u1ebft h\u1ee3p bao g\u1ed3m vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee9c t\u1ea1p b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. Thay v\u00ec k\u1ebf th\u1eeba h\u00e0nh vi, m\u1ed9t l\u1edbp ch\u1ee9a c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a c\u00e1c l\u1edbp kh\u00e1c nh\u01b0 tr\u01b0\u1eddng d\u1eef li\u1ec7u. C\u01a1 ch\u1ebf n\u00e0y th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 \u201cC\u00f3-m\u1ed9t\u201d<\/strong> m\u1ed1i quan h\u1ec7. S\u1eed d\u1ee5ng v\u00ed d\u1ee5 tr\u01b0\u1edbc \u0111\u00f3, m\u1ed9t Car<\/code> c\u00f3 th\u1ec3 ch\u1ee9a m\u1ed9t Engine<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. Chi\u1ebfc xe h\u01a1i c\u00f3<\/em> m\u1ed9t \u0111\u1ed9ng c\u01a1, thay v\u00ec l\u00e0<\/em> m\u1ed9t \u0111\u1ed9ng c\u01a1.<\/p>\n

    C\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i c\u1ee7a k\u1ebft h\u1ee3p<\/h3>\n
      \n
    • K\u1ebft n\u1ed1i l\u1ecfng l\u1ebbo:<\/strong> C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee5 thu\u1ed9c v\u00e0o giao di\u1ec7n ho\u1eb7c tr\u1eebu t\u01b0\u1ee3ng thay v\u00ec c\u00e1c tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/li>\n
    • T\u00ednh linh ho\u1ea1t t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y:<\/strong> C\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i m\u1ed9t c\u00e1ch \u0111\u1ed9ng trong qu\u00e1 tr\u00ecnh th\u1ef1c thi.<\/li>\n
    • Bao \u0111\u00f3ng:<\/strong>Tr\u1ea1ng th\u00e1i b\u00ean trong \u0111\u01b0\u1ee3c \u1ea9n \u0111i, v\u00e0 t\u01b0\u01a1ng t\u00e1c x\u1ea3y ra th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh.<\/li>\n<\/ul>\n

      S\u1ee9c m\u1ea1nh c\u1ee7a t\u00ednh linh ho\u1ea1t<\/h3>\n

      K\u1ebft h\u1ee3p cho ph\u00e9p t\u00ednh module cao h\u01a1n. B\u1ea1n c\u00f3 th\u1ec3 thay th\u1ebf c\u00e1c th\u00e0nh ph\u1ea7n m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i c\u1ea5u tr\u00fac c\u1ed1t l\u00f5i c\u1ee7a l\u1edbp. V\u00ed d\u1ee5, m\u1ed9t ReportGenerator<\/code> l\u1edbp c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ec3 \u0111\u1ecbnh d\u1ea1ng. B\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ecbnh d\u1ea1ng m\u00e0 kh\u00f4ng c\u1ea7n ch\u1ea1m v\u00e0o m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ed9 t\u1ea1o b\u00e1o c\u00e1o. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi Nguy\u00ean t\u1eafc M\u1edf\/\u0110\u00f3ng, n\u01a1i c\u00e1c th\u1ef1c th\u1ec3 ph\u1ea7n m\u1ec1m n\u00ean \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng nh\u01b0ng \u0111\u00f3ng l\u1ea1i \u0111\u1ed1i v\u1edbi thay \u0111\u1ed5i.<\/p>\n

      \ud83d\udcca So s\u00e1nh: K\u1ebf th\u1eeba vs K\u1ebft h\u1ee3p<\/h2>\n

      B\u1ea3ng sau \u0111\u00e2y n\u00eau b\u1eadt nh\u1eefng kh\u00e1c bi\u1ec7t ch\u00ednh \u0111\u1ec3 h\u1ed7 tr\u1ee3 vi\u1ec7c ra quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n\n\n\n\n\n\n\n\n
      T\u00ednh n\u0103ng<\/th>\nK\u1ebf th\u1eeba<\/th>\nK\u1ebft h\u1ee3p<\/th>\n<\/tr>\n<\/thead>\n
      M\u1ed1i quan h\u1ec7<\/strong><\/td>\n\u201cL\u00e0-m\u1ed9t\u201d<\/td>\n\u201cC\u00f3-m\u1ed9t\u201d<\/td>\n<\/tr>\n
      K\u1ebft n\u1ed1i<\/strong><\/td>\nCh\u1eb7t ch\u1ebd<\/td>\nL\u1ecfng l\u1ebbo<\/td>\n<\/tr>\n
      T\u00ednh linh ho\u1ea1t<\/strong><\/td>\nTh\u1ea5p (th\u1eddi \u0111i\u1ec3m bi\u00ean d\u1ecbch)<\/td>\nCao (th\u1eddi \u0111i\u1ec3m ch\u1ea1y)<\/td>\n<\/tr>\n
      T\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n<\/strong><\/td>\nCao<\/td>\nTrung b\u00ecnh (th\u00f4ng qua \u1ee7y quy\u1ec1n)<\/td>\n<\/tr>\n
      Ki\u1ec3m th\u1eed<\/strong><\/td>\nPh\u1ee9c t\u1ea1p (gi\u1ea3 l\u1eadp cha m\u1eb9)<\/td>\n\u0110\u01a1n gi\u1ea3n (gi\u1ea3 l\u1eadp ph\u1ee5 thu\u1ed9c)<\/td>\n<\/tr>\n
      Ghi \u0111\u00e8<\/strong><\/td>\nH\u1ed7 tr\u1ee3 \u0111a h\u00ecnh<\/td>\nY\u00eau c\u1ea7u \u1ee7y quy\u1ec1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \ud83d\udee0\ufe0f Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng k\u1ebf th\u1eeba<\/h2>\n

      K\u1ebf th\u1eeba v\u1eabn l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 qu\u00fd gi\u00e1 khi m\u1ed1i quan h\u1ec7 l\u00e0 ph\u00e2n c\u1ea5p nghi\u00eam ng\u1eb7t v\u00e0 h\u00e0nh vi l\u1edbp c\u01a1 s\u1edf \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng ph\u1ed5 bi\u1ebfn cho t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con. N\u00f3 ph\u00f9 h\u1ee3p nh\u1ea5t khi b\u1ea1n c\u00f3 m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n lo\u1ea1i r\u00f5 r\u00e0ng.<\/p>\n

        \n
      • Ph\u00e2n lo\u1ea1i r\u00f5 r\u00e0ng:<\/strong> Khi l\u1edbp con ch\u1eafc ch\u1eafn l\u00e0 m\u1ed9t ki\u1ec3u c\u1ee7a l\u1edbp cha. M\u1ed9t H\u00ecnh vu\u00f4ng<\/code> l\u00e0 m\u1ed9t H\u00ecnh ch\u1eef nh\u1eadt<\/code> (v\u1ec1 m\u1eb7t to\u00e1n h\u1ecdc), nh\u01b0ng h\u00e3y c\u1ea9n tr\u1ecdng v\u1edbi c\u00e1c gi\u1ea3 \u0111\u1ecbnh h\u00ecnh h\u1ecdc.<\/li>\n
      • H\u00e0nh vi chung:<\/strong> Khi t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con \u0111\u1ec1u y\u00eau c\u1ea7u c\u00f9ng m\u1ed9t tri\u1ec3n khai ch\u00ednh x\u00e1c c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c, v\u00e0 tri\u1ec3n khai \u0111\u00f3 kh\u00f3 c\u00f3 kh\u1ea3 n\u0103ng thay \u0111\u1ed5i \u0111\u1ed9c l\u1eadp.<\/li>\n
      • Y\u00eau c\u1ea7u \u0111a h\u00ecnh:<\/strong> Khi b\u1ea1n c\u1ea7n x\u1eed l\u00fd c\u00e1c ki\u1ec3u kh\u00e1c nhau m\u1ed9t c\u00e1ch \u0111\u1ed3ng nh\u1ea5t th\u00f4ng qua m\u1ed9t giao di\u1ec7n chung ho\u1eb7c l\u1edbp c\u01a1 s\u1edf.<\/li>\n
      • C\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \u1ed5n \u0111\u1ecbnh:<\/strong> Khi c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00f3 c\u00f3 kh\u1ea3 n\u0103ng thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 trong su\u1ed1t v\u00f2ng \u0111\u1eddi ph\u1ea7n m\u1ec1m.<\/li>\n<\/ul>\n

        \ud83d\udee0\ufe0f Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p<\/h2>\n

        K\u1ebft h\u1ee3p th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i. N\u00f3 mang l\u1ea1i kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t cao h\u01a1n v\u00e0 gi\u1ea3m thi\u1ec3u r\u1ee7i ro c\u00e1c thay \u0111\u1ed5i g\u00e2y l\u1ed7i lan truy\u1ec1n qua h\u1ec7 th\u1ed1ng.<\/p>\n

          \n
        • S\u1ef1 thay \u0111\u1ed5i v\u1ec1 h\u00e0nh vi:<\/strong> Khi m\u1ed9t l\u1edbp c\u1ea7n c\u00e1c h\u00e0nh vi kh\u00e1c nhau v\u00e0o c\u00e1c th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau. B\u1ea1n c\u00f3 th\u1ec3 ch\u00e8n c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ho\u1eb7c th\u00e0nh ph\u1ea7n kh\u00e1c nhau.<\/li>\n
        • Logic ph\u1ee9c t\u1ea1p:<\/strong> Khi logic ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi m\u1ed9t l\u1edbp chuy\u00ean bi\u1ec7t thay v\u00ec m\u1ed9t l\u1edbp cha.<\/li>\n
        • Nhi\u1ec1u kh\u1ea3 n\u0103ng:<\/strong> Khi m\u1ed9t l\u1edbp c\u1ea7n k\u1ebft h\u1ee3p c\u00e1c t\u00ednh n\u0103ng t\u1eeb nhi\u1ec1u ngu\u1ed3n kh\u00e1c nhau. M\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n<\/code> c\u00f3 th\u1ec3 c\u1ea7n c\u1ea3 hai L\u00e1i xe<\/code> v\u00e0 Phanh<\/code> kh\u1ea3 n\u0103ng t\u1eeb c\u00e1c m\u00f4-\u0111un kh\u00e1c nhau.<\/li>\n
        • Y\u00eau c\u1ea7u ki\u1ec3m th\u1eed:<\/strong> Khi t\u00e1ch bi\u1ec7t l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t trong ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb. Vi\u1ec7c m\u00f4 ph\u1ecfng c\u00e1c ph\u1ee5 thu\u1ed9c d\u1ec5 h\u01a1n vi\u1ec7c m\u00f4 ph\u1ecfng tr\u1ea1ng th\u00e1i l\u1edbp cha.<\/li>\n
        • Tr\u00e1nh s\u1ef1 mong manh:<\/strong> Khi b\u1ea1n mu\u1ed1n ng\u0103n ch\u1eb7n nh\u1eefng thay \u0111\u1ed5i trong l\u1edbp c\u01a1 s\u1edf \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u00e3 ph\u1ee5 thu\u1ed9c.<\/li>\n<\/ul>\n

          \ud83e\uddea H\u1ec7 qu\u1ea3 \u0111\u1ed1i v\u1edbi ki\u1ec3m th\u1eed<\/h2>\n

          Ki\u1ec3m th\u1eed l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t khi l\u1ef1a ch\u1ecdn gi\u1eefa c\u00e1c m\u1eabu n\u00e0y. K\u1ebf th\u1eeba c\u00f3 th\u1ec3 khi\u1ebfn ki\u1ec3m th\u1eed tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p v\u00ec m\u00f4i tr\u01b0\u1eddng ki\u1ec3m th\u1eed th\u01b0\u1eddng ph\u1ea3i m\u00f4 ph\u1ecfng tr\u1ea1ng th\u00e1i c\u1ee7a l\u1edbp cha. N\u1ebfu l\u1edbp cha c\u00f3 logic kh\u1edfi t\u1ea1o ph\u1ee9c t\u1ea1p, c\u00e1c b\u00e0i ki\u1ec3m th\u1eed cho l\u1edbp con s\u1ebd tr\u1edf n\u00ean n\u1eb7ng n\u1ec1.<\/p>\n

          T\u1ed5 h\u1ee3p \u0111\u01a1n gi\u1ea3n h\u00f3a ki\u1ec3m th\u1eed. B\u1ea1n c\u00f3 th\u1ec3 thay th\u1ebf c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eb1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ki\u1ec3m th\u1eed (m\u00f4 ph\u1ecfng ho\u1eb7c gi\u1ea3 l\u1eadp) m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn logic c\u1ed1t l\u00f5i. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn vi\u1ec7c th\u1ef1c thi ki\u1ec3m th\u1eed nhanh h\u01a1n v\u00e0 k\u1ebft qu\u1ea3 \u0111\u00e1ng tin c\u1eady h\u01a1n. Khi m\u1ed9t l\u1edbp ph\u1ee5 thu\u1ed9c v\u00e0o giao di\u1ec7n cho c\u00e1c ph\u1ee5 thu\u1ed9c c\u1ee7a m\u00ecnh, b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng thay \u0111\u1ed5i tri\u1ec3n khai trong qu\u00e1 tr\u00ecnh x\u00e1c minh.<\/p>\n

          \ud83d\udd04 T\u00e1i c\u1ea5u tr\u00fac v\u00e0 Ti\u1ebfn h\u00f3a<\/h2>\n

          Ph\u1ea7n m\u1ec1m ti\u1ebfn h\u00f3a. Y\u00eau c\u1ea7u thay \u0111\u1ed5i. Ki\u1ebfn tr\u00fac ph\u1ea3i h\u1ed7 tr\u1ee3 s\u1ef1 ti\u1ebfn h\u00f3a n\u00e0y. K\u1ebf th\u1eeba bu\u1ed9c b\u1ea1n ph\u1ea3i tu\u00e2n theo m\u1ed9t c\u1ea5u tr\u00fac \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh t\u1ea1i th\u1eddi \u0111i\u1ec3m bi\u00ean d\u1ecbch. N\u1ebfu b\u1ea1n c\u1ea7n thay \u0111\u1ed5i m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp, th\u01b0\u1eddng b\u1ea1n ph\u1ea3i t\u00e1i c\u1ea5u tr\u00fac to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac k\u1ebf th\u1eeba.<\/p>\n

          T\u1ed5 h\u1ee3p h\u1ed7 tr\u1ee3 ti\u1ebfn h\u00f3a t\u1ed1t h\u01a1n. B\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi thi\u1ec7u c\u00e1c kh\u1ea3 n\u0103ng m\u1edbi b\u1eb1ng c\u00e1ch t\u1ea1o ra c\u00e1c l\u1edbp m\u1edbi v\u00e0 ch\u00e8n ch\u00fang v\u00e0o c\u00e1c l\u1edbp hi\u1ec7n c\u00f3. B\u1ea1n kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i \u0111\u1ecbnh ngh\u0129a l\u1edbp \u0111\u00f3. \u0110i\u1ec1u n\u00e0y h\u1ed7 tr\u1ee3 \u00fd t\u01b0\u1edfng x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean thay v\u00ec b\u1ecb \u00e9p v\u00e0o m\u1ed9t khung c\u1ee9ng nh\u1eafc.<\/p>\n

          \ud83d\udeab Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

          Ngay c\u1ea3 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 v\u1ea5p ng\u00e3 khi \u00e1p d\u1ee5ng c\u00e1c m\u1eabu n\u00e0y. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n l\u01b0u \u00fd.<\/p>\n

            \n
          • L\u1ea1m d\u1ee5ng k\u1ebf th\u1eeba:<\/strong> T\u1ea1o ra c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u, n\u01a1i m\u1ed9t l\u1edbp n\u1eb1m qu\u00e1 xa g\u1ed1c. \u0110i\u1ec1u n\u00e0y khi\u1ebfn m\u00e3 ngu\u1ed3n kh\u00f3 duy\u1ec7t v\u00e0 hi\u1ec3u.<\/li>\n
          • B\u1eaft bu\u1ed9c m\u1ed1i quan h\u1ec7 \u201cl\u00e0 m\u1ed9t\u201d:<\/strong> T\u1ea1o l\u1edbp con ch\u1ec9 \u0111\u1ec3 t\u00e1i s\u1eed d\u1ee5ng m\u00e3, ngay c\u1ea3 khi m\u1ed1i quan h\u1ec7 \u0111\u00f3 kh\u00f4ng h\u1ee3p l\u00fd v\u1ec1 m\u1eb7t logic. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 \u201cL\u1edbp c\u01a1 s\u1edf mong manh\u201d.<\/li>\n
          • B\u1ecf qua t\u1ed5 h\u1ee3p:<\/strong> Cho r\u1eb1ng k\u1ebf th\u1eeba l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 chia s\u1ebb m\u00e3. \u0110i\u1ec1u n\u00e0y gi\u1edbi h\u1ea1n t\u00ednh linh ho\u1ea1t v\u00e0 l\u00e0m t\u0103ng \u0111\u1ed9 li\u00ean k\u1ebft.<\/li>\n
          • Qu\u00e1 m\u1ee9c thi\u1ebft k\u1ebf:<\/strong> S\u1eed d\u1ee5ng c\u00e1c m\u1eabu t\u1ed5 h\u1ee3p ph\u1ee9c t\u1ea1p khi k\u1ebf th\u1eeba \u0111\u01a1n gi\u1ea3n \u0111\u00e3 \u0111\u1ee7. H\u00e3y gi\u1eef \u0111\u01a1n gi\u1ea3n cho \u0111\u1ebfn khi \u0111\u1ed9 ph\u1ee9c t\u1ea1p th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft.<\/li>\n
          • Vi ph\u1ea1m nguy\u00ean t\u1eafc thay th\u1ebf Liskov:<\/strong> T\u1ea1o ra c\u00e1c l\u1edbp con ph\u00e1 v\u1ee1 k\u1ef3 v\u1ecdng c\u1ee7a l\u1edbp cha. N\u1ebfu m\u1ed9t l\u1edbp con kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf n\u01a1i m\u00e0 l\u1edbp cha \u0111\u01b0\u1ee3c k\u1ef3 v\u1ecdng, th\u00ec c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p l\u00e0 sai l\u1ec7ch.<\/li>\n<\/ul>\n

            \ud83c\udf0d C\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf<\/h2>\n

            H\u00e3y c\u00f9ng xem c\u00e1ch c\u00e1c m\u1eabu n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong c\u00e1c t\u00ecnh hu\u1ed1ng t\u1ed5ng qu\u00e1t m\u00e0 kh\u00f4ng c\u1ea7n tham chi\u1ebfu \u0111\u1ebfn n\u1ec1n t\u1ea3ng c\u1ee5 th\u1ec3 n\u00e0o.<\/p>\n

            T\u00ecnh hu\u1ed1ng 1: X\u1eed l\u00fd thanh to\u00e1n<\/h3>\n

            H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t h\u1ec7 th\u1ed1ng x\u1eed l\u00fd giao d\u1ecbch. B\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t l\u1edbpPaymentProcessor<\/code> l\u1edbp. N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng k\u1ebf th\u1eeba, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3CreditCardProcessor<\/code>, PayPalProcessor<\/code>, v\u00e0BitcoinProcessor<\/code> k\u1ebf th\u1eeba t\u1eebPaymentProcessor<\/code>. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c thanh to\u00e1n m\u1edbi \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, b\u1ea1n s\u1ebd th\u00eam m\u1ed9t l\u1edbp m\u1edbi. Tuy nhi\u00ean, n\u1ebfu logic l\u1edbp c\u01a1 s\u1edf thay \u0111\u1ed5i, t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 x\u1eed l\u00fd s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng. S\u1eed d\u1ee5ng k\u1ebft h\u1ee3p, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t l\u1edbpTransactionManager<\/code> ch\u1ee9a m\u1ed9tPaymentStrategy<\/code>. B\u1ea1n ch\u00e8n chi\u1ebfn l\u01b0\u1ee3c c\u1ee5 th\u1ec3 c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p th\u00eam c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u1edbi m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n c\u1ee7a qu\u1ea3n l\u00fd vi\u00ean.<\/p>\n

            C\u1ea3nh hu\u1ed1ng 2: Giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng<\/h3>\n

            X\u00e9t m\u1ed9t giao di\u1ec7n \u0111\u1ed3 h\u1ecda. M\u1ed9t l\u1edbpButton<\/code> c\u00f3 th\u1ec3 k\u1ebf th\u1eeba t\u1eeb m\u1ed9t l\u1edbpWidget<\/code> l\u1edbp. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn v\u00ec c\u00e1c thu\u1ed9c t\u00ednh h\u00ecnh \u1ea3nh \u0111\u01b0\u1ee3c chia s\u1ebb. Tuy nhi\u00ean, n\u1ebfu b\u1ea1n c\u1ea7n th\u00eam m\u1ed9tClickListener<\/code>, Draggable<\/code>, ho\u1eb7cResizable<\/code> kh\u1ea3 n\u0103ng, k\u1ebf th\u1eeba s\u1ebd tr\u1edf n\u00ean l\u1ed9n x\u1ed9n. Thay v\u00e0o \u0111\u00f3, b\u1ea1n k\u1ebft h\u1ee3p c\u00e1c h\u00e0nh vi n\u00e0y. L\u1edbpButton<\/code> ch\u1ee9a c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a c\u00e1c giao di\u1ec7n kh\u1ea3 n\u0103ng n\u00e0y. \u0110i\u1ec1u n\u00e0y gi\u00fap logic c\u1ed1t l\u00f5i c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c s\u1ea1ch s\u1ebd.<\/p>\n

            C\u1ea3nh hu\u1ed1ng 3: X\u00e1c th\u1ef1c d\u1eef li\u1ec7u<\/h3>\n

            Khi x\u00e1c th\u1ef1c d\u1eef li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 c\u00e1c quy t\u1eafc cho email, s\u1ed1 \u0111i\u1ec7n tho\u1ea1i v\u00e0 tu\u1ed5i. Thay v\u00ec k\u1ebf th\u1eeba logic x\u00e1c th\u1ef1c, b\u1ea1n c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p m\u1ed9t t\u1eadp h\u1ee3p c\u00e1cValidator<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. Validator ch\u00ednh s\u1ebd l\u1eb7p qua danh s\u00e1ch n\u00e0y. Vi\u1ec7c th\u00eam m\u1ed9t quy t\u1eafc m\u1edbi \u0111\u01a1n gi\u1ea3n nh\u01b0 vi\u1ec7c th\u00eam m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng m\u1edbi v\u00e0o danh s\u00e1ch. \u0110i\u1ec1u n\u00e0y linh ho\u1ea1t h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c t\u1ea1o ra m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u00e1c l\u1edbp validator.<\/p>\n

            \ud83c\udfc6 Quy t\u1eafc V\u00e0ng v\u1ec1 Thi\u1ebft k\u1ebf<\/h2>\n

            C\u00f3 m\u1ed9t nguy\u00ean t\u1eafc \u0111\u1ecbnh h\u01b0\u1edbng trong ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m \u0111\u1ec1 xu\u1ea5t \u01b0u ti\u00ean k\u1ebft h\u1ee3p thay v\u00ec k\u1ebf th\u1eeba. M\u1eb7c d\u00f9 k\u1ebf th\u1eeba kh\u00f4ng t\u1ef1 th\u00e2n x\u1ea5u, nh\u01b0ng c\u1ea7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch ti\u1ebft ch\u1ebf. N\u00ean d\u00e0nh cho nh\u1eefng tr\u01b0\u1eddng h\u1ee3p m\u1ed1i quan h\u1ec7 th\u1ef1c s\u1ef1 ph\u00e2n c\u1ea5p v\u00e0 h\u00e0nh vi \u1ed5n \u0111\u1ecbnh. \u0110\u1ed1i v\u1edbi ph\u1ea7n l\u1edbn logic kinh doanh v\u00e0 c\u1ea5u tr\u00fac \u1ee9ng d\u1ee5ng, k\u1ebft h\u1ee3p mang l\u1ea1i s\u1ef1 linh ho\u1ea1t c\u1ea7n thi\u1ebft.<\/p>\n

            T\u1eadp trung x\u00e2y d\u1ef1ng c\u00e1c l\u1edbp nh\u1ecf, t\u1eadp trung v\u00e0o m\u1ed9t vi\u1ec7c l\u00e0m t\u1ed1t. K\u1ebft h\u1ee3p ch\u00fang \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn h\u01a1n. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y gi\u1ea3m di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t cho l\u1ed7i v\u00e0 gi\u00fap m\u00e3 ngu\u1ed3n d\u1ec5 hi\u1ec3u h\u01a1n. N\u00f3 c\u0169ng ph\u00f9 h\u1ee3p v\u1edbi Nguy\u00ean t\u1eafc Tr\u00e1ch nhi\u1ec7m \u0110\u01a1n nh\u1ea5t, n\u01a1i m\u1ed9t l\u1edbp ch\u1ec9 n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i.<\/p>\n

            \ud83e\udded Suy ngh\u0129 Cu\u1ed1i C\u00f9ng<\/h2>\n

            Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa k\u1ebf th\u1eeba v\u00e0 k\u1ebft h\u1ee3p kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh nh\u1ecb ph\u00e2n m\u00e0 l\u00e0 m\u1ed9t thang \u0111o c\u00e1c l\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf. N\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o nhu c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n, m\u1ee9c \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a y\u00eau c\u1ea7u v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a l\u0129nh v\u1ef1c c\u1ee7a b\u1ea1n. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 \u0111i\u1ec3m m\u1ea1nh v\u00e0 \u0111i\u1ec3m y\u1ebfu c\u1ee7a t\u1eebng ph\u01b0\u01a1ng ph\u00e1p, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9 tr\u01b0\u1edbc s\u1ef1 thay \u0111\u1ed5i.<\/p>\n

            B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp c\u1ee7a b\u1ea1n. \u0110\u00f3 l\u00e0 m\u1ed1i quan h\u1ec7 \u201cL\u00e0-M\u1ed9t\u201d hay \u201cC\u00f3-M\u1ed9t\u201d? N\u1ebfu l\u00e0 lo\u1ea1i sau, h\u00e3y thi\u00ean v\u1ec1 k\u1ebft h\u1ee3p. N\u1ebfu l\u00e0 lo\u1ea1i tr\u01b0\u1edbc, h\u00e3y c\u00e2n nh\u1eafc k\u1ebf th\u1eeba, nh\u01b0ng lu\u00f4n c\u1ea3nh gi\u00e1c v\u1edbi nguy c\u01a1 r\u00e0ng bu\u1ed9c. Lu\u00f4n \u01b0u ti\u00ean kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00e0 t\u00ednh linh ho\u1ea1t h\u01a1n vi\u1ec7c t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n ngay l\u1eadp t\u1ee9c. B\u1ea3n th\u00e2n b\u1ea1n trong t\u01b0\u01a1ng lai, v\u00e0 nh\u00f3m ng\u01b0\u1eddi duy tr\u00ec m\u00e3 ngu\u1ed3n, s\u1ebd c\u1ea3m k\u00edch v\u00ec nh\u1eefng l\u1ef1a ch\u1ecdn c\u00f3 ch\u1ee7 \u00fd n\u00e0y.<\/p>\n

            Ti\u1ebfp t\u1ee5c ho\u00e0n thi\u1ec7n k\u1ef9 n\u0103ng thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n. Nghi\u00ean c\u1ee9u c\u00e1c m\u1eabu thi\u1ebft k\u1ebf \u0111\u1ec3 th\u1ea5y c\u00e1ch c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf. H\u00e3y nh\u1edb r\u1eb1ng m\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c \u0111\u1ecdc nhi\u1ec1u h\u01a1n l\u00e0 \u0111\u01b0\u1ee3c vi\u1ebft. H\u00e3y vi\u1ebft m\u00e3 ngu\u1ed3n th\u1ec3 hi\u1ec7n r\u00f5 \u00fd \u0111\u1ecbnh v\u00e0 d\u1ec5 d\u00e0ng th\u00edch nghi v\u1edbi c\u00e1c y\u00eau c\u1ea7u m\u1edbi.<\/p>\n","protected":false},"excerpt":{"rendered":"

            Thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m m\u1ea1nh m\u1ebd \u0111\u00f2i h\u1ecfi s\u1ef1 c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng v\u1ec1 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean k\u1ebft v\u1edbi nhau. Hai c\u01a1 ch\u1ebf ch\u00ednh x\u00e1c…<\/p>\n","protected":false},"author":1,"featured_media":3832,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"K\u1ebf th\u1eeba so v\u1edbi K\u1ebft h\u1ee3p: Ch\u1ecdn Chi\u1ebfn l\u01b0\u1ee3c OOP Ph\u00f9 H\u1ee3p","_yoast_wpseo_metadesc":"So s\u00e1nh K\u1ebf th\u1eeba v\u1edbi K\u1ebft h\u1ee3p trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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