{"id":63,"date":"2026-04-11T17:27:37","date_gmt":"2026-04-11T17:27:37","guid":{"rendered":"https:\/\/www.hi-posts.com\/vn\/ooad-inheritance-code-structure-guide\/"},"modified":"2026-04-11T17:27:37","modified_gmt":"2026-04-11T17:27:37","slug":"ooad-inheritance-code-structure-guide","status":"publish","type":"post","link":"https:\/\/www.hi-posts.com\/vn\/ooad-inheritance-code-structure-guide\/","title":{"rendered":"B\u01b0\u1edbc v\u00e0o s\u00e2u v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng: Hi\u1ec3u r\u00f5 v\u1ec1 K\u1ebf th\u1eeba \u0111\u1ec3 c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n t\u1ed1t h\u01a1n"},"content":{"rendered":"
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\"Charcoal<\/figure>\n<\/div>\n

\ud83d\udcda Gi\u1edbi thi\u1ec7u v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

Trong b\u1ed1i c\u1ea3nh ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, duy tr\u00ec s\u1ef1 r\u00f5 r\u00e0ng v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng l\u00e0 \u0111i\u1ec1u t\u1ed1i quan tr\u1ecdng. Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOAD) cung c\u1ea5p m\u1ed9t khung \u0111\u1ec3 chia nh\u1ecf c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p th\u00e0nh nh\u1eefng th\u00e0nh ph\u1ea7n c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd \u0111\u01b0\u1ee3c, t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. \u1ede trung t\u00e2m c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 kh\u00e1i ni\u1ec7m K\u1ebf th\u1eeba<\/strong>. C\u01a1 ch\u1ebf n\u00e0y cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n t\u1ea1o ra c\u00e1c l\u1edbp m\u1edbi d\u1ef1a tr\u00ean c\u00e1c l\u1edbp hi\u1ec7n c\u00f3, th\u00fac \u0111\u1ea9y m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p ph\u1ea3n \u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7 trong th\u1ebf gi\u1edbi th\u1ef1c.<\/p>\n

Khi \u0111\u01b0\u1ee3c tri\u1ec3n khai \u0111\u00fang c\u00e1ch, k\u1ebf th\u1eeba gi\u00fap qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n tr\u1edf n\u00ean tr\u01a1n tru h\u01a1n. N\u00f3 gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng logic c\u1ed1t l\u00f5i \u0111\u01b0\u1ee3c duy tr\u00ec nh\u1ea5t qu\u00e1n \u1edf c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a h\u1ec7 th\u1ed1ng. Tuy nhi\u00ean, \u00e1p d\u1ee5ng kh\u00e1i ni\u1ec7m n\u00e0y m\u00e0 kh\u00f4ng c\u00f3 n\u1ec1n t\u1ea3ng ph\u00e2n t\u00edch v\u1eefng ch\u1eafc c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c c\u1ea5u tr\u00fac c\u1ee9ng nh\u1eafc, kh\u00f3 thay \u0111\u1ed5i. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c c\u01a1 ch\u1ebf c\u1ee7a k\u1ebf th\u1eeba trong OOAD, xem x\u00e9t c\u00e1ch n\u00f3 \u0111\u1ecbnh h\u00ecnh c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec l\u00e2u d\u00e0i.<\/p>\n

\ud83d\udd0d C\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a K\u1ebf th\u1eeba<\/h2>\n

\u0110\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c l\u1ee3i \u00edch c\u1ee7a k\u1ebf th\u1eeba, tr\u01b0\u1edbc ti\u00ean ta ph\u1ea3i hi\u1ec3u r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp. Trong l\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, m\u1ed9t l\u1edbp \u0111\u1ecbnh ngh\u0129a b\u1ea3n v\u1ebd cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. K\u1ebf th\u1eeba gi\u1edbi thi\u1ec7u m\u1ed1i quan h\u1ec7 cha-con, trong \u0111\u00f3 l\u1edbp con k\u1ebf th\u1eeba c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi t\u1eeb l\u1edbp cha.<\/p>\n

\ud83c\udf33 C\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p l\u1edbp<\/h3>\n

M\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p l\u1edbp l\u00e0 m\u1ed9t c\u1ea5u tr\u00fac d\u1ea1ng c\u00e2y, n\u01a1i c\u00e1c l\u1edbp \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang. \u0110\u1ec9nh c\u1ee7a c\u00e2y th\u01b0\u1eddng ch\u1ee9a m\u1ed9t l\u1edbp t\u1ed5ng qu\u00e1t ho\u1eb7c tr\u1eebu t\u01b0\u1ee3ng, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1edbp cha<\/strong> ho\u1eb7c l\u1edbp c\u01a1 s\u1edf<\/strong>. C\u00e1c l\u1edbp n\u1eb1m d\u01b0\u1edbi n\u00f3 l\u00e0 l\u1edbp con<\/strong> ho\u1eb7c l\u1edbp \u0111\u01b0\u1ee3c d\u1eabn xu\u1ea5t<\/strong>.<\/p>\n

    \n
  • L\u1edbp cha:<\/strong>X\u00e1c \u0111\u1ecbnh c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c chung \u0111\u01b0\u1ee3c chia s\u1ebb b\u1edfi m\u1ed9t nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan.<\/li>\n
  • L\u1edbp con:<\/strong>K\u1ebf th\u1eeba t\u1eeb l\u1edbp cha nh\u01b0ng c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ecbnh ngh\u0129a c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ed9c \u0111\u00e1o ho\u1eb7c ghi \u0111\u00e8 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

    C\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p n\u00e0y cho ph\u00e9p nh\u00f3m logic. V\u00ed d\u1ee5, m\u1ed9t l\u1edbp Ph\u01b0\u01a1ng ti\u1ec7n<\/em> c\u00f3 th\u1ec3 \u0111\u1ecbnh ngh\u0129a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u1ed1c \u0111\u1ed9<\/em> v\u00e0 lo\u1ea1i nhi\u00ean li\u1ec7u<\/em>. C\u00e1c ph\u01b0\u01a1ng ti\u1ec7n c\u1ee5 th\u1ec3 nh\u01b0 Xe \u00f4 t\u00f4<\/em> ho\u1eb7c Xe t\u1ea3i<\/em> th\u1eeba h\u01b0\u1edfng nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y \u0111\u1ed3ng th\u1eddi th\u00eam c\u00e1c t\u00ednh n\u0103ng c\u1ee5 th\u1ec3 nh\u01b0 s\u1ed1_l\u01b0\u1ee3ng_c\u1eeda<\/em>.<\/p>\n

    \ud83d\udd17 M\u1ed1i quan h\u1ec7 IS-A<\/h3>\n

    K\u1ebf th\u1eeba v\u1ec1 c\u01a1 b\u1ea3n \u0111\u1ea1i di\u1ec7n cho m\u1ed9t IS-A<\/strong> m\u1ed1i quan h\u1ec7. N\u1ebfu m\u1ed9t Xe h\u01a1i<\/em> l\u1edbp th\u1eeba k\u1ebf t\u1eeb m\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n<\/em> l\u1edbp, th\u00ec m\u1ed9t Xe h\u01a1i IS-A<\/em> Ph\u01b0\u01a1ng ti\u1ec7n. Li\u00ean k\u1ebft ng\u1eef ngh\u0129a n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi \u0111a h\u00ecnh, cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 th\u1ec3 ch\u00fang l\u00e0 th\u1ec3 hi\u1ec7n c\u1ee7a ki\u1ec3u cha c\u1ee7a ch\u00fang.<\/p>\n

      \n
    • D\u01b0\u01a1ng t\u00ednh th\u1eadt:<\/strong> M\u1ed9t Chim IS-A \u0110\u1ed9ng v\u1eadt. (K\u1ebf th\u1eeba h\u1ee3p l\u1ec7)<\/li>\n
    • D\u01b0\u01a1ng t\u00ednh gi\u1ea3:<\/strong> M\u1ed9t Xe h\u01a1i IS-A \u0110\u1ed9ng c\u01a1. (K\u1ebf th\u1eeba kh\u00f4ng h\u1ee3p l\u1ec7 \u2013 M\u1ed9t Xe h\u01a1i HAS-A \u0110\u1ed9ng c\u01a1)<\/li>\n<\/ul>\n

      Nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y gi\u00fap ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i c\u1ea5u tr\u00fac. N\u00ean s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p (HAS-A) khi m\u1ed1i quan h\u1ec7 kh\u00f4ng ph\u1ea3i l\u00e0 ki\u1ec3u, m\u00e0 l\u00e0 s\u1edf h\u1eefu ho\u1eb7c li\u00ean k\u1ebft.<\/p>\n

      \ud83c\udfd7\ufe0f C\u00e1c lo\u1ea1i m\u00f4 h\u00ecnh k\u1ebf th\u1eeba<\/h2>\n

      Nh\u1eefng nhu c\u1ea7u ki\u1ebfn tr\u00fac kh\u00e1c nhau \u0111\u00f2i h\u1ecfi c\u00e1c m\u1eabu k\u1ebf th\u1eeba kh\u00e1c nhau. Hi\u1ec3u r\u00f5 c\u00e1c m\u00f4 h\u00ecnh c\u00f3 s\u1eb5n s\u1ebd gi\u00fap l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p cho ph\u1ea1m vi d\u1ef1 \u00e1n c\u1ee5 th\u1ec3.<\/p>\n

      1\ufe0f\u20e3 K\u1ebf th\u1eeba \u0111\u01a1n<\/h3>\n

      \u0110\u00e2y l\u00e0 d\u1ea1ng \u0111\u01a1n gi\u1ea3n nh\u1ea5t, n\u01a1i m\u1ed9t l\u1edbp con th\u1eeba k\u1ebf t\u1eeb \u0111\u00fang m\u1ed9t l\u1edbp cha. N\u00f3 t\u1ea1o ra m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p r\u00f5 r\u00e0ng, tuy\u1ebfn t\u00ednh.<\/p>\n

        \n
      • \u01afu \u0111i\u1ec3m:<\/strong>D\u1ec5 hi\u1ec3u, \u0111\u1ed9 ph\u1ee9c t\u1ea1p t\u1ed1i thi\u1ec3u, gi\u1ea3m nguy c\u01a1 xung \u0111\u1ed9t.<\/li>\n
      • Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>T\u00ednh linh ho\u1ea1t h\u1ea1n ch\u1ebf, c\u00f3 th\u1ec3 c\u1ea7n nhi\u1ec1u l\u1edbp c\u01a1 s\u1edf \u0111\u1ec3 \u0111\u00e1p \u1ee9ng m\u1ecdi nhu c\u1ea7u.<\/li>\n<\/ul>\n

        2\ufe0f\u20e3 K\u1ebf th\u1eeba \u0111a c\u1ea5p<\/h3>\n

        \u1ede \u0111\u00e2y, m\u1ed9t l\u1edbp th\u1eeba k\u1ebf t\u1eeb m\u1ed9t l\u1edbp m\u00e0 ch\u00ednh n\u00f3 l\u1ea1i th\u1eeba k\u1ebf t\u1eeb m\u1ed9t l\u1edbp kh\u00e1c. N\u00f3 t\u1ea1o th\u00e0nh chu\u1ed7i ph\u1ee5 thu\u1ed9c.<\/p>\n

          \n
        • C\u1ea5u tr\u00fac:<\/strong> \u00d4ng b\u00e0 \u2192 Cha m\u1eb9 \u2192 Con c\u00e1i.<\/li>\n
        • Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng:<\/strong>Th\u00edch h\u1ee3p cho vi\u1ec7c chuy\u00ean bi\u1ec7t h\u00f3a d\u1ea7n d\u1ea7n, n\u01a1i m\u1ed7i c\u1ea5p \u0111\u1ed9 th\u00eam c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n

          3\ufe0f\u20e3 K\u1ebf th\u1eeba ph\u00e2n c\u1ea5p<\/h3>\n

          Nhi\u1ec1u l\u1edbp con k\u1ebf th\u1eeba t\u1eeb m\u1ed9t l\u1edbp cha duy nh\u1ea5t. \u0110i\u1ec1u n\u00e0y ph\u1ed5 bi\u1ebfn trong c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean ph\u00e2n lo\u1ea1i.<\/p>\n

            \n
          • V\u00ed d\u1ee5:<\/strong> M\u1ed9t l\u1edbp c\u01a1 s\u1edf H\u00ecnh d\u1ea1ng<\/em> c\u00f3 c\u00e1c l\u1edbp con H\u00ecnh tr\u00f2n<\/em>, H\u00ecnh vu\u00f4ng<\/em>, v\u00e0 H\u00ecnh tam gi\u00e1c<\/em>.<\/li>\n
          • L\u1ee3i \u00edch:<\/strong>T\u1eadp trung logic chung trong l\u1edbp c\u01a1 s\u1edf.<\/li>\n<\/ul>\n

            4\ufe0f\u20e3 K\u1ebf th\u1eeba \u0111a c\u1ea5p<\/h3>\n

            M\u1ed9t l\u1edbp k\u1ebf th\u1eeba t\u1eeb nhi\u1ec1u l\u1edbp cha h\u01a1n m\u1ed9t. M\u1eb7c d\u00f9 m\u1ea1nh m\u1ebd, \u0111i\u1ec1u n\u00e0y t\u1ea1o ra \u0111\u1ed9 ph\u1ee9c t\u1ea1p \u0111\u00e1ng k\u1ec3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c gi\u1ea3i quy\u1ebft ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

              \n
            • \u0110\u1ed9 ph\u1ee9c t\u1ea1p:<\/strong> Y\u00eau c\u1ea7u x\u1eed l\u00fd c\u1ea9n tr\u1ecdng c\u00e1c xung \u0111\u1ed9t t\u00ean.<\/li>\n
            • H\u1ed7 tr\u1ee3 ng\u00f4n ng\u1eef:<\/strong> Kh\u00f4ng ph\u1ea3i ng\u00f4n ng\u1eef n\u00e0o c\u0169ng h\u1ed7 tr\u1ee3 \u0111i\u1ec1u n\u00e0y m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean do v\u1ea5n \u0111\u1ec1 V\u1ea5n \u0111\u1ec1 Kim c\u01b0\u01a1ng<\/strong>.<\/li>\n<\/ul>\n

              5\ufe0f\u20e3 K\u1ebf th\u1eeba k\u1ebft h\u1ee3p<\/h3>\n

              S\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a hai ho\u1eb7c nhi\u1ec1u lo\u1ea1i k\u1ebf th\u1eeba. M\u00f4 h\u00ecnh n\u00e0y c\u1ed1 g\u1eafng c\u00e2n b\u1eb1ng l\u1ee3i \u00edch c\u1ee7a k\u1ebf th\u1eeba \u0111a c\u1ea5p v\u1edbi s\u1ef1 r\u00f5 r\u00e0ng c\u1ee7a c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p.<\/p>\n

              \ud83d\udca1 L\u1ee3i \u00edch chi\u1ebfn l\u01b0\u1ee3c cho ki\u1ebfn tr\u00fac<\/h2>\n

              T\u1ea1i sao ph\u1ea3i \u0111\u1ea7u t\u01b0 c\u00f4ng s\u1ee9c v\u00e0o vi\u1ec7c thi\u1ebft k\u1ebf c\u00e1c c\u1ea5u tr\u00fac k\u1ebf th\u1eeba? L\u1ee3i \u00edch v\u01b0\u1ee3t xa vi\u1ec7c l\u1eb7p l\u1ea1i m\u00e3 ngu\u1ed3n \u0111\u01a1n gi\u1ea3n.<\/p>\n

              \u267b\ufe0f Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng m\u00e3<\/h3>\n

              Y\u1ebfu t\u1ed1 ch\u00ednh l\u00e0 kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng. B\u1eb1ng c\u00e1ch \u0111\u1ecbnh ngh\u0129a logic trong l\u1edbp cha, logic \u0111\u00f3 s\u1ebd c\u00f3 s\u1eb5n cho t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con m\u00e0 kh\u00f4ng c\u1ea7n vi\u1ebft l\u1ea1i. \u0110i\u1ec1u n\u00e0y gi\u1ea3m s\u1ed1 d\u00f2ng m\u00e3 v\u00e0 t\u1ed1i thi\u1ec3u h\u00f3a di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t g\u00e2y l\u1ed7i.<\/p>\n

              \ud83d\udee0\ufe0f Kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec<\/h3>\n

              Khi c\u1ea7n thay \u0111\u1ed5i h\u00e0nh vi chung, vi\u1ec7c c\u1eadp nh\u1eadt l\u1edbp cha s\u1ebd lan truy\u1ec1n thay \u0111\u1ed5i \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con. S\u1ef1 t\u1eadp trung n\u00e0y khi\u1ebfn vi\u1ec7c b\u1ea3o tr\u00ec tr\u1edf n\u00ean d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c.<\/p>\n

              \ud83d\udd12 Bao \u0111\u00f3ng v\u00e0 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a<\/h3>\n

              K\u1ebf th\u1eeba h\u1ed7 tr\u1ee3 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a b\u1eb1ng c\u00e1ch che gi\u1ea5u chi ti\u1ebft tri\u1ec3n khai c\u1ee7a l\u1edbp cha. C\u00e1c l\u1edbp con t\u01b0\u01a1ng t\u00e1c v\u1edbi giao di\u1ec7n c\u00f4ng khai c\u1ee7a l\u1edbp cha, \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u n\u1ed9i b\u1ed9 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/p>\n

              \ud83e\udde9 N\u1ec1n t\u1ea3ng \u0111a h\u00ecnh<\/h3>\n

              \u0110a h\u00ecnh d\u1ef1a v\u00e0o k\u1ebf th\u1eeba. N\u00f3 cho ph\u00e9p m\u1ed9t giao di\u1ec7n duy nh\u1ea5t bi\u1ec3u di\u1ec5n c\u00e1c d\u1ea1ng c\u01a1 s\u1edf kh\u00e1c nhau (ki\u1ec3u d\u1eef li\u1ec7u). \u0110i\u1ec1u n\u00e0y r\u1ea5t c\u1ea7n thi\u1ebft cho thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng linh ho\u1ea1t, n\u01a1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c nhau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd m\u1ed9t c\u00e1ch \u0111\u1ed3ng nh\u1ea5t.<\/p>\n

              \u26a0\ufe0f Nguy c\u01a1 v\u00e0 c\u00e1c m\u1eabu sai l\u1ea7m<\/h2>\n

              M\u1eb7c d\u00f9 k\u1ebf th\u1eeba r\u1ea5t m\u1ea1nh m\u1ebd, nh\u01b0ng vi\u1ec7c s\u1eed d\u1ee5ng sai c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng. Hi\u1ec3u r\u00f5 nh\u1eefng \u0111i\u1ec3m nguy hi\u1ec3m n\u00e0y l\u00e0 quan tr\u1ecdng ngang b\u1eb1ng vi\u1ec7c hi\u1ec3u \u0111\u01b0\u1ee3c l\u1ee3i \u00edch c\u1ee7a n\u00f3.<\/p>\n

              \ud83d\udeab K\u1ebf th\u1eeba qu\u00e1 m\u1ee9c<\/h3>\n

              T\u1ea1o ra c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u (nhi\u1ec1u h\u01a1n 3-4 c\u1ea5p) khi\u1ebfn h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean mong manh. Nh\u1eefng thay \u0111\u1ed5i \u1edf l\u1edbp c\u01a1 s\u1edf c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7u \u1ee9ng lan truy\u1ec1n kh\u00f4ng mong mu\u1ed1n tr\u00ean to\u00e0n b\u1ed9 c\u00e2y ph\u00e2n c\u1ea5p.<\/p>\n

              \ud83d\udd17 Li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd<\/h3>\n

              C\u00e1c l\u1edbp con tr\u1edf n\u00ean li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd v\u1edbi cha c\u1ee7a ch\u00fang. N\u1ebfu l\u1edbp cha thay \u0111\u1ed5i tri\u1ec3n khai n\u1ed9i b\u1ed9, l\u1edbp con c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng ngay c\u1ea3 khi giao di\u1ec7n c\u00f4ng khai v\u1eabn gi\u1eef nguy\u00ean.<\/p>\n

              \ud83d\udc0d V\u1ea5n \u0111\u1ec1 kim c\u01b0\u01a1ng<\/h3>\n

              Trong k\u1ebf th\u1eeba \u0111a c\u1ea5p, n\u1ebfu m\u1ed9t l\u1edbp k\u1ebf th\u1eeba t\u1eeb hai l\u1edbp m\u00e0 c\u1ea3 hai l\u1edbp n\u00e0y \u0111\u1ec1u k\u1ebf th\u1eeba t\u1eeb m\u1ed9t t\u1ed5 ti\u00ean chung, s\u1ebd n\u1ea3y sinh s\u1ef1 m\u01a1 h\u1ed3 v\u1ec1 vi\u1ec7c g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c n\u00e0o t\u1eeb t\u1ed5 ti\u00ean n\u00e0o. Gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1c t\u00ednh n\u0103ng ng\u00f4n ng\u1eef \u0111\u1eb7c bi\u1ec7t ho\u1eb7c c\u00e1c m\u1eabu thi\u1ebft k\u1ebf.<\/p>\n

              \ud83e\uddf1 L\u1edbp c\u01a1 s\u1edf d\u1ec5 t\u1ed5n th\u01b0\u01a1ng<\/h3>\n

              M\u1ed9t l\u1edbp c\u01a1 s\u1edf qu\u00e1 ph\u1ee9c t\u1ea1p ho\u1eb7c thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean s\u1ebd tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn. C\u00e1c l\u1edbp con ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a l\u1edbp n\u00e0y. N\u1ebfu l\u1edbp c\u01a1 s\u1edf thay \u0111\u1ed5i, to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng.<\/p>\n

              \ud83d\udcca K\u1ebf th\u1eeba so v\u1edbi k\u1ebft h\u1ee3p<\/h2>\n

              M\u1ed9t quy\u1ebft \u0111\u1ecbnh quan tr\u1ecdng trong OOAD l\u00e0 l\u1ef1a ch\u1ecdn gi\u1eefa k\u1ebf th\u1eeba v\u00e0 k\u1ebft h\u1ee3p. K\u1ebft h\u1ee3p th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean v\u00ec t\u00ednh linh ho\u1ea1t.<\/p>\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<\/td>\nL\u00c0-M\u1ed8T<\/td>\nC\u00d3-M\u1ed8T<\/td>\n<\/tr>\n
              T\u00ednh linh ho\u1ea1t<\/td>\nTh\u1ea5p (T\u0129nh t\u1ea1i th\u1eddi \u0111i\u1ec3m bi\u00ean d\u1ecbch)<\/td>\nCao (\u0110\u1ed9ng t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y)<\/td>\n<\/tr>\n
              Bao \u0111\u00f3ng<\/td>\nTh\u1ea5p (C\u00e1c th\u00e0nh vi\u00ean \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 th\u01b0\u1eddng b\u1ecb ti\u1ebft l\u1ed9)<\/td>\nCao (Chi ti\u1ebft n\u1ed9i b\u1ed9 \u0111\u01b0\u1ee3c \u1ea9n)<\/td>\n<\/tr>\n
              Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng<\/td>\nCao cho h\u00e0nh vi, Th\u1ea5p cho tr\u1ea1ng th\u00e1i<\/td>\nCao cho c\u1ea3 tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi<\/td>\n<\/tr>\n
              \u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/td>\nT\u0103ng theo \u0111\u1ed9 s\u00e2u<\/td>\nT\u0103ng theo s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Nguy\u00ean t\u1eafc:<\/strong>S\u1eed d\u1ee5ng k\u1ebf th\u1eeba khi m\u1ed1i quan h\u1ec7 l\u00e0 nghi\u00eam ng\u1eb7tL\u00c0-M\u1ed8T<\/em>. S\u1eed d\u1ee5ng k\u1ebft h\u1ee3p khi m\u1ed1i quan h\u1ec7 l\u00e0C\u00d3-M\u1ed8T<\/em> ho\u1eb7c khi h\u00e0nh vi c\u1ea7n thay \u0111\u1ed5i \u0111\u1ed9ng.<\/p>\n

              \ud83d\udee0\ufe0f H\u01b0\u1edbng d\u1eabn tri\u1ec3n khai<\/h2>\n

              Tu\u00e2n theo c\u00e1c nguy\u00ean t\u1eafc \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u1ea3m b\u1ea3o c\u1ea5u tr\u00fac k\u1ebf th\u1eeba v\u1eabn v\u1eefng ch\u1eafc.<\/p>\n

              1. Nguy\u00ean t\u1eafc thay th\u1ebf Liskov (LSP)<\/h3>\n

              C\u00e1c ki\u1ec3u con ph\u1ea3i c\u00f3 th\u1ec3 thay th\u1ebf \u0111\u01b0\u1ee3c cho ki\u1ec3u c\u01a1 s\u1edf c\u1ee7a ch\u00fang. N\u1ebfu m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 s\u1eed d\u1ee5ng m\u1ed9tPh\u01b0\u01a1ng ti\u1ec7n<\/em>\u0111\u1ed1i t\u01b0\u1ee3ng, thay th\u1ebf n\u00f3 b\u1eb1ng m\u1ed9tXe h\u01a1i<\/em>\u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng n\u00ean l\u00e0m h\u1ecfng h\u1ec7 th\u1ed1ng. Nguy\u00ean t\u1eafc n\u00e0y ng\u0103n ch\u1eb7n c\u00e1c l\u1edbp con vi ph\u1ea1m h\u1ee3p \u0111\u1ed3ng c\u1ee7a l\u1edbp cha.<\/p>\n

              2. T\u00e1ch bi\u1ec7t giao di\u1ec7n<\/h3>\n

              Nhi\u1ec1u giao di\u1ec7n nh\u1ecf, c\u1ee5 th\u1ec3 t\u1ed1t h\u01a1n m\u1ed9t giao di\u1ec7n l\u1edbn, chung chung. C\u00e1c l\u1edbp con kh\u00f4ng n\u00ean b\u1ecb \u00e9p ph\u1ea3i tri\u1ec3n khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 ch\u00fang kh\u00f4ng s\u1eed d\u1ee5ng. \u0110i\u1ec1u n\u00e0y gi\u1ea3m thi\u1ec3u s\u1ef1 c\u1ed3ng k\u1ec1nh v\u00e0 nh\u1ea7m l\u1eabn.<\/p>\n

              3. \u01afa chu\u1ed9ng k\u1ebft h\u1ee3p h\u01a1n k\u1ebf th\u1eeba<\/h3>\n

              Nh\u01b0 \u0111\u00e3 n\u00eau tr\u01b0\u1edbc \u0111\u00f3, c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a m\u00e3 ngu\u1ed3n k\u00e9m. N\u1ebfu m\u1ed9t l\u1edbp c\u1ea7n h\u00e0nh vi t\u1eeb nhi\u1ec1u ngu\u1ed3n, h\u00e3y c\u00e2n nh\u1eafc k\u1ebft h\u1ee3p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thay v\u00ec k\u1ebf th\u1eeba t\u1eeb nhi\u1ec1u l\u1edbp.<\/p>\n

              4. L\u1edbp c\u01a1 s\u1edf tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n

              S\u1eed d\u1ee5ng l\u1edbp tr\u1eebu t\u01b0\u1ee3ng \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a m\u1ed9t h\u1ee3p \u0111\u1ed3ng m\u00e0 c\u00e1c l\u1edbp con ph\u1ea3i th\u1ef1c hi\u1ec7n. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n trong to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p m\u00e0 kh\u00f4ng c\u1ea7n tri\u1ec3n khai logic c\u1ee5 th\u1ec3 cho m\u1ecdi t\u00ecnh hu\u1ed1ng c\u00f3 th\u1ec3 x\u1ea3y ra.<\/p>\n

              5. Tr\u00e1nh s\u1eed d\u1ee5ng th\u00e0nh vi\u00ean protected c\u00f4ng khai<\/h3>\n

              T\u1ed1i thi\u1ec3u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c th\u00e0nh vi\u00ean protected trong l\u1edbp cha. \u0110i\u1ec1u n\u00e0y bu\u1ed9c c\u00e1c l\u1edbp con ph\u1ea3i t\u01b0\u01a1ng t\u00e1c th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng, b\u1ea3o to\u00e0n t\u00ednh \u0111\u00f3ng g\u00f3i.<\/p>\n

              \ud83d\udcdd C\u00e1c b\u01b0\u1edbc ph\u00e2n t\u00edch th\u1ef1c t\u1ebf<\/h2>\n

              Vi\u1ec7c \u00e1p d\u1ee5ng l\u00fd thuy\u1ebft n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac trong c\u00e1c giai \u0111o\u1ea1n ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf.<\/p>\n

                \n
              • X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3:<\/strong>Li\u1ec7t k\u00ea c\u00e1c danh t\u1eeb trong l\u0129nh v\u1ef1c v\u1ea5n \u0111\u1ec1. Nh\u1eefng danh t\u1eeb n\u00e0o c\u00f3 li\u00ean quan?<\/li>\n
              • X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7:<\/strong>Ch\u00fang l\u00e0 IS-A hay HAS-A? V\u1ebd s\u01a1 \u0111\u1ed3 \u0111\u1ec3 tr\u1ef1c quan h\u00f3a.<\/li>\n
              • X\u00e1c \u0111\u1ecbnh t\u00ednh chung:<\/strong>Nh\u1eefng thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c chia s\u1ebb?<\/li>\n
              • Tinh ch\u1ec9nh th\u1ee9 b\u1eadc:<\/strong>H\u1ea1n ch\u1ebf \u0111\u1ed9 s\u00e2u. H\u1ecfi xem m\u1ed9t l\u1edbp con c\u00f3 th\u1ef1c s\u1ef1 c\u1ea7n l\u00e0 con tr\u1ef1c ti\u1ebfp c\u1ee7a l\u1edbp c\u01a1 s\u1edf hay c\u00f3 c\u1ea7n m\u1ed9t l\u1edbp trung gian hay kh\u00f4ng.<\/li>\n
              • Xem x\u00e9t \u0111\u1ed9 li\u00ean k\u1ebft:<\/strong>Ki\u1ec3m tra xem nh\u1eefng thay \u0111\u1ed5i \u1edf l\u1edbp c\u01a1 s\u1edf c\u00f3 lan r\u1ed9ng qu\u00e1 m\u1ee9c hay kh\u00f4ng.<\/li>\n<\/ul>\n

                \ud83d\ude80 Ti\u1ebfn b\u01b0\u1edbc v\u1edbi c\u1ea5u tr\u00fac<\/h2>\n

                C\u1ea5u tr\u00fac m\u00e3 hi\u1ec7u qu\u1ea3 l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a ph\u1ea7n m\u1ec1m b\u1ec1n v\u1eefng. K\u1ebf th\u1eeba, khi \u0111\u01b0\u1ee3c hi\u1ec3u v\u00e0 \u00e1p d\u1ee5ng m\u1ed9t c\u00e1ch k\u1ef7 lu\u1eadt, mang l\u1ea1i c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u1ec3 t\u1ed5 ch\u1ee9c logic. N\u00f3 cho ph\u00e9p h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n theo s\u1ef1 thay \u0111\u1ed5i y\u00eau c\u1ea7u, mi\u1ec5n l\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 n\u1ec1n t\u1ea3ng v\u1eabn v\u1eefng ch\u1eafc.<\/p>\n

                C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n lu\u00f4n c\u1ea3nh gi\u00e1c tr\u01b0\u1edbc c\u00e1m d\u1ed7 \u00e9p bu\u1ed9c k\u1ebf th\u1eeba v\u00e0o nh\u1eefng n\u01a1i kh\u00f4ng ph\u00f9 h\u1ee3p. M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ed1i \u0111a h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng k\u1ebf th\u1eeba, m\u00e0 l\u00e0 t\u1ed1i thi\u1ec3u h\u00f3a \u0111\u1ed9 ph\u1ee9c t\u1ea1p \u0111\u1ed3ng th\u1eddi t\u1ed1i \u0111a h\u00f3a s\u1ef1 r\u00f5 r\u00e0ng. B\u1eb1ng c\u00e1ch c\u00e2n b\u1eb1ng k\u1ebf th\u1eeba v\u1edbi k\u1ebft h\u1ee3p v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf, c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9, m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec theo th\u1eddi gian.<\/p>\n

                Cu\u1ed1i c\u00f9ng, vi\u1ec7c l\u1ef1a ch\u1ecdn c\u1ea5u tr\u00fac \u0111\u1ecbnh ngh\u0129a tu\u1ed5i th\u1ecd c\u1ee7a ph\u1ea7n m\u1ec1m. M\u1ed9t th\u1ee9 b\u1eadc \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng s\u1ebd gi\u1ea3m n\u1ee3 k\u1ef9 thu\u1eadt. M\u1ed9t th\u1ee9 b\u1eadc b\u1eeba b\u00e3i s\u1ebd t\u1ea1o ra n\u1ee3 k\u1ef9 thu\u1eadt. Ph\u00e2n t\u00edch c\u1ea9n th\u1eadn \u1edf giai \u0111o\u1ea1n thi\u1ebft k\u1ebf s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch l\u1edbn trong c\u00e1c giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n v\u00e0 b\u1ea3o tr\u00ec.<\/p>\n","protected":false},"excerpt":{"rendered":"

                \ud83d\udcda Gi\u1edbi thi\u1ec7u v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng Trong b\u1ed1i c\u1ea3nh ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, duy tr\u00ec s\u1ef1 r\u00f5 r\u00e0ng v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng l\u00e0…<\/p>\n","protected":false},"author":1,"featured_media":64,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 OOAD: Hi\u1ec3u k\u1ebf th\u1eeba \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac m\u00e3","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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