{"id":1926,"date":"2026-03-23T08:27:58","date_gmt":"2026-03-23T08:27:58","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/generalization-hierarchies-system-design\/"},"modified":"2026-03-23T08:27:58","modified_gmt":"2026-03-23T08:27:58","slug":"generalization-hierarchies-system-design","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/generalization-hierarchies-system-design\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: C\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1i qu\u00e1t trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng"},"content":{"rendered":"
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\"Comic<\/figure>\n<\/div>\n

Trong b\u1ed1i c\u1ea3nh Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOAD), \u00edt c\u01a1 ch\u1ebf n\u00e0o v\u1eeba n\u1ec1n t\u1ea3ng l\u1ea1i v\u1eeba tinh t\u1ebf nh\u01b0c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1i qu\u00e1t<\/strong>. Nh\u1eefng c\u1ea5u tr\u00fac n\u00e0y cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n m\u00f4 h\u00ecnh h\u00f3a m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp, n\u01a1i m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u k\u1ebf th\u1eeba \u0111\u1eb7c \u0111i\u1ec3m t\u1eeb ki\u1ec3u kh\u00e1c. B\u1eb1ng c\u00e1ch t\u1ed5 ch\u1ee9c c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea7n m\u1ec1m theo c\u1ea5u tr\u00fac d\u1ea1ng c\u00e2y, h\u1ec7 th\u1ed1ng s\u1ebd c\u00f3 s\u1ef1 r\u00f5 r\u00e0ng, kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng v\u00e0 lu\u1ed3ng logic ph\u1ea3n \u00e1nh c\u00e1ch ph\u00e2n lo\u1ea1i trong th\u1ebf gi\u1edbi th\u1ef1c. B\u00e0i vi\u1ebft n\u00e0y kh\u00e1m ph\u00e1 v\u1ec1 c\u01a1 ch\u1ebf, l\u1ee3i \u00edch v\u00e0 nh\u1eefng r\u1ee7i ro khi tri\u1ec3n khai c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1i qu\u00e1t m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n

Hi\u1ec3u r\u00f5 kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i \ud83e\udde0<\/h2>\n

Kh\u00e1i qu\u00e1t h\u00f3a l\u00e0 qu\u00e1 tr\u00ecnh tr\u00edch xu\u1ea5t c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m chung t\u1eeb m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 nh\u00f3m ch\u00fang d\u01b0\u1edbi m\u1ed9t l\u1edbp cha. C\u00e1c th\u1ef1c th\u1ec3 k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1edbp con. M\u1ed1i quan h\u1ec7 n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 l\u00e0 m\u1ed9tm\u1ed1i quan h\u1ec7 \u201cl\u00e0-m\u1ed9t\u201d<\/strong>. V\u00ed d\u1ee5, m\u1ed9tXe \u00f4 t\u00f4<\/code> l\u00e0 m\u1ed9tPh\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng<\/code>. M\u1ed9tSedan<\/code> l\u00e0 m\u1ed9tXe \u00f4 t\u00f4<\/code>. C\u1ea5p \u0111\u1ed9 n\u00e0y cho ph\u00e9p h\u1ec7 th\u1ed1ng x\u1eed l\u00fd c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 m\u1ed9t c\u00e1ch \u0111a h\u00ecnh.<\/p>\n

Khi thi\u1ebft k\u1ebf c\u00e1c c\u1ea5p \u0111\u1ed9 n\u00e0y, m\u1ee5c ti\u00eau l\u00e0 gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p. Thay v\u00ec \u0111\u1ecbnh ngh\u0129alo\u1ea1i \u0111\u1ed9ng c\u01a1<\/code>, s\u1ed1 l\u01b0\u1ee3ng b\u00e1nh xe<\/code>, v\u00e0t\u1ed1c \u0111\u1ed9<\/code>trong t\u1eebng l\u1edbp m\u1ed9t, b\u1ea1n ch\u1ec9 c\u1ea7n \u0111\u1ecbnh ngh\u0129a ch\u00fang m\u1ed9t l\u1ea7n trong l\u1edbp cha. C\u00e1c l\u1edbp con s\u1ebd t\u1ef1 \u0111\u1ed9ng k\u1ebf th\u1eeba nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0y, tr\u1eeb khi ch\u00fang ch\u1ecdn ghi \u0111\u00e8 ch\u00fang.<\/p>\n

C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a m\u1ed9t c\u1ea5p \u0111\u1ed9<\/h3>\n
    \n
  • L\u1edbp cha (L\u1edbp c\u01a1 s\u1edf):<\/strong> Ki\u1ec3u kh\u00e1i qu\u00e1t h\u00f3a ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c chung.<\/li>\n
  • L\u1edbp con (L\u1edbp \u0111\u01b0\u1ee3c t\u1ea1o ra):<\/strong> Ki\u1ec3u chuy\u00ean bi\u1ec7t h\u00f3a k\u1ebf th\u1eeba t\u1eeb l\u1edbp cha v\u00e0 th\u00eam c\u00e1c t\u00ednh n\u0103ng \u0111\u1ed9c \u0111\u00e1o.<\/li>\n
  • K\u1ebf th\u1eeba:<\/strong> C\u01a1 ch\u1ebf m\u00e0 theo \u0111\u00f3 l\u1edbp con thu \u0111\u01b0\u1ee3c c\u00e1c thu\u1ed9c t\u00ednh t\u1eeb l\u1edbp cha.<\/li>\n
  • \u0110a h\u00ecnh:<\/strong> Kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a c\u00e1c l\u1edbp con kh\u00e1c nhau nh\u01b0 th\u1ec3 ch\u00fang l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp cha chung.<\/li>\n<\/ul>\n

    T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng kh\u00e1i qu\u00e1t h\u00f3a? \ud83d\ude80<\/h2>\n

    Vi\u1ec7c tri\u1ec3n khai m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t mang l\u1ea1i l\u1ee3i \u00edch th\u1ef1c t\u1ebf v\u1ec1 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00e0 m\u1edf r\u1ed9ng. Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, vi\u1ec7c qu\u1ea3n l\u00fd s\u1ef1 tr\u00f9ng l\u1eb7p m\u00e3 ngu\u1ed3n tr\u1edf th\u00e0nh m\u1ed9t th\u00e1ch th\u1ee9c l\u1edbn. Kh\u00e1i qu\u00e1t h\u00f3a gi\u1ea3m nh\u1eb9 \u0111i\u1ec1u n\u00e0y th\u00f4ng qua tr\u1eebu t\u01b0\u1ee3ng h\u00f3a.<\/p>\n

    L\u1ee3i \u00edch ch\u00ednh<\/h3>\n
      \n
    • Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n:<\/strong>Logic chung t\u1ed3n t\u1ea1i \u1edf m\u1ed9t n\u01a1i duy nh\u1ea5t. Nh\u1eefng thay \u0111\u1ed5i s\u1ebd t\u1ef1 \u0111\u1ed9ng lan truy\u1ec1n \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con.<\/li>\n
    • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>\u0110\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c ki\u1ec3u \u0111\u01b0\u1ee3c d\u1eabn xu\u1ea5t tu\u00e2n theo m\u1ed9t giao di\u1ec7n chung ho\u1eb7c h\u1ee3p \u0111\u1ed3ng h\u00e0nh vi.<\/li>\n
    • Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a:<\/strong>Gi\u1ea5u c\u00e1c chi ti\u1ebft tri\u1ec3n khai c\u1ee7a l\u1edbp c\u01a1 s\u1edf, cho ph\u00e9p nh\u00e0 ph\u00e1t tri\u1ec3n t\u1eadp trung v\u00e0o ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 c\u1ee7a l\u1edbp con.<\/li>\n
    • Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>C\u00e1c ki\u1ec3u m\u1edbi c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i m\u00e3 ngu\u1ed3n hi\u1ec7n c\u00f3, tu\u00e2n theo Nguy\u00ean t\u1eafc M\u1edf\/\u0110\u00f3ng.<\/li>\n<\/ul>\n

      Thi\u1ebft k\u1ebf c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \ud83d\udcd0<\/h2>\n

      Vi\u1ec7c t\u1ea1o ra m\u1ed9t ph\u00e2n c\u1ea5p kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 nh\u00f3m c\u00e1c l\u1edbp t\u01b0\u01a1ng t\u1ef1 nhau. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng v\u1ec1 \u0111\u1ed9 s\u00e2u v\u00e0 \u0111\u1ed9 r\u1ed9ng c\u1ee7a c\u00e2y ph\u00e2n c\u1ea5p. M\u1ed9t ph\u00e2n c\u1ea5p ph\u1eb3ng c\u00f3 th\u1ec3 d\u1ec5 hi\u1ec3u h\u01a1n, trong khi m\u1ed9t ph\u00e2n c\u1ea5p s\u00e2u c\u00f3 th\u1ec3 cung c\u1ea5p \u0111\u1ed9 chi ti\u1ebft cao h\u01a1n nh\u01b0ng l\u1ea1i ti\u1ec1m \u1ea9n nguy c\u01a1 d\u1ec5 b\u1ecb h\u1ecfng.<\/p>\n

      M\u1ee9c \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n

      H\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng m\u00f4 h\u00ecnh h\u00f3a x\u1eed l\u00fd thanh to\u00e1n. B\u1ea1n c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u b\u1eb1ng m\u1ed9t l\u1edbp c\u01a1 s\u1edf t\u00ean l\u00e0Ph\u01b0\u01a1ngTh\u1ee9cThanhTo\u00e1n<\/code>. C\u00e1c l\u1edbp con c\u00f3 th\u1ec3 bao g\u1ed3mTh\u1ebbT\u00ednD\u1ee5ng<\/code>, Chuy\u1ec3nKho\u1ea3nNg\u00e2nH\u00e0ng<\/code>, v\u00e0V\u00edS\u1ed1<\/code>. M\u1ed7i l\u1edbp con tri\u1ec3n khai m\u1ed9t ph\u01b0\u01a1ng th\u1ee9cxuLyThanhToan()<\/code> c\u1ee5 th\u1ec3 v\u1edbi ki\u1ec3u c\u1ee7a n\u00f3, trong khi l\u1edbp c\u01a1 s\u1edf \u0111\u1ecbnh ngh\u0129a h\u1ee3p \u0111\u1ed3ng.<\/p>\n

        \n
      • M\u1ee9c \u0111\u1ed9 1:<\/strong> C\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng (v\u00ed d\u1ee5 nh\u01b0\u0110\u1ed1iT\u01b0\u1ee3ng<\/code> ho\u1eb7c Th\u00e0nh ph\u1ea7n<\/code>).<\/li>\n
      • C\u1ea5p \u0111\u1ed9 2:<\/strong>Nh\u00f3m ch\u1ee9c n\u0103ng (v\u00ed d\u1ee5 nh\u01b0 Ph\u01b0\u01a1ng th\u1ee9c thanh to\u00e1n<\/code>, Lo\u1ea1i b\u00e1o c\u00e1o<\/code>).<\/li>\n
      • C\u1ea5p \u0111\u1ed9 3:<\/strong>C\u00e1c tri\u1ec3n khai c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5 nh\u01b0 Th\u1ebb t\u00edn d\u1ee5ng<\/code>, B\u00e1o c\u00e1o h\u00f3a \u0111\u01a1n<\/code>).<\/li>\n<\/ul>\n

        H\u1ea1n ch\u1ebf s\u1ed1 l\u01b0\u1ee3ng c\u1ea5p \u0111\u1ed9 gi\u00fap ng\u0103n ng\u1eeba c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p tr\u1edf n\u00ean qu\u00e1 ph\u1ee9c t\u1ea1p. N\u1ebfu b\u1ea1n nh\u1eadn th\u1ea5y m\u00ecnh \u0111ang l\u1ed3ng gh\u00e9p c\u00e1c l\u1edbp s\u00e2u h\u01a1n ba ho\u1eb7c b\u1ed1n c\u1ea5p \u0111\u1ed9, \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 d\u1ea5u hi\u1ec7u \u0111\u1ec3 t\u00e1i c\u1ea5u tr\u00fac.<\/p>\n

        Nguy\u00ean t\u1eafc tri\u1ec3n khai \ud83d\udee1\ufe0f<\/h2>\n

        Vi\u1ebft m\u00e3 k\u1ebf th\u1eeba \u0111\u01a1n thu\u1ea7n l\u00e0 ch\u01b0a \u0111\u1ee7. Vi\u1ec7c tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c l\u1eadp \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p v\u1eabn v\u1eefng ch\u1eafc theo th\u1eddi gian.<\/p>\n

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

        Nguy\u00ean t\u1eafc n\u00e0y n\u00eau r\u1eb1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp cha ph\u1ea3i c\u00f3 th\u1ec3 thay th\u1ebf b\u1eb1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp con m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng \u1ee9ng d\u1ee5ng. N\u1ebfu m\u1ed9t l\u1edbp con thay \u0111\u1ed5i h\u00e0nh vi c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c k\u1ebf th\u1eeba t\u1eeb l\u1edbp cha theo c\u00e1ch b\u1ea5t ng\u1edd, th\u00ec \u0111i\u1ec1u \u0111\u00f3 vi ph\u1ea1m LSP.<\/p>\n

          \n
        • V\u00ed d\u1ee5 vi ph\u1ea1m:<\/strong> M\u1ed9t H\u00ecnh ch\u1eef nh\u1eadt<\/code> l\u1edbp con H\u00ecnh vu\u00f4ng<\/code> trong \u0111\u00f3 vi\u1ec7c thi\u1ebft l\u1eadp chi\u1ec1u r\u1ed9ng l\u00e0m thay \u0111\u1ed5i chi\u1ec1u cao m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd.<\/li>\n
        • C\u00e1ch ti\u1ebfp c\u1eadn \u0111\u00fang:<\/strong> \u0110\u1ea3m b\u1ea3o h\u00e0nh vi v\u1eabn nh\u1ea5t qu\u00e1n. L\u1edbp con ph\u1ea3i tu\u00e2n th\u1ee7 h\u1ee3p \u0111\u1ed3ng c\u1ee7a l\u1edbp cha.<\/li>\n<\/ul>\n

          2. Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m \u0111\u01a1n nh\u1ea5t (SRP)<\/h3>\n

          M\u1ed9t l\u1edbp ch\u1ec9 n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. N\u1ebfu m\u1ed9t l\u1edbp cha t\u00edch t\u1ee5 qu\u00e1 nhi\u1ec1u tr\u00e1ch nhi\u1ec7m, c\u00e1c l\u1edbp con s\u1ebd k\u1ebf th\u1eeba s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft. H\u00e3y chia nh\u1ecf c\u00e1c l\u1edbp l\u1edbn th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p nh\u1ecf h\u01a1n, t\u1eadp trung h\u01a1n.<\/p>\n

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

          C\u00e1c l\u1edbp con kh\u00f4ng n\u00ean b\u1ecb bu\u1ed9c ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 ch\u00fang kh\u00f4ng s\u1eed d\u1ee5ng. N\u1ebfu m\u1ed9t l\u1edbp c\u01a1 s\u1edf \u0111\u1ecbnh ngh\u0129a hai m\u01b0\u01a1i ph\u01b0\u01a1ng th\u1ee9c nh\u01b0ng m\u1ed9t l\u1edbp con ch\u1ec9 c\u1ea7n n\u0103m ph\u01b0\u01a1ng th\u1ee9c, h\u00e3y c\u00e2n nh\u1eafc s\u1eed d\u1ee5ng giao di\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u1ee3p \u0111\u1ed3ng c\u1ee5 th\u1ec3 cho l\u1edbp con \u0111\u00f3.<\/p>\n

          Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn v\u00e0 m\u1eabu ch\u1ed1ng l\u1ea1i t\u1ed1t \u26a0\ufe0f<\/h2>\n

          M\u1eb7c d\u00f9 m\u1ea1nh m\u1ebd, c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p t\u1ed5ng qu\u00e1t c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn n\u1ee3 k\u1ef9 thu\u1eadt \u0111\u00e1ng k\u1ec3 n\u1ebfu b\u1ecb s\u1eed d\u1ee5ng sai. Nh\u1eadn di\u1ec7n nh\u1eefng m\u1eabu n\u00e0y s\u1edbm s\u1ebd ng\u0103n ng\u1eeba vi\u1ec7c t\u00e1i c\u1ea5u tr\u00fac trong t\u01b0\u01a1ng lai.<\/p>\n

          V\u1ea5n \u0111\u1ec1 l\u1edbp c\u01a1 s\u1edf d\u1ec5 b\u1ecb h\u1ecfng<\/h3>\n

          Khi m\u1ed9t l\u1edbp c\u01a1 s\u1edf thay \u0111\u1ed5i, t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng x\u1ea3y ra khi l\u1edbp c\u01a1 s\u1edf l\u01b0u tr\u1eef chi ti\u1ebft tri\u1ec3n khai thay v\u00ec ch\u1ec9 c\u00f3 giao di\u1ec7n. C\u00e1c l\u1edbp con th\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c th\u00e0nh vi\u00ean b\u1ea3o v\u1ec7 ho\u1eb7c th\u1ee9 t\u1ef1 kh\u1edfi t\u1ea1o c\u1ee5 th\u1ec3.<\/p>\n

            \n
          • Gi\u1ea3i ph\u00e1p:<\/strong>\u01afu ti\u00ean k\u1ebft h\u1ee3p h\u01a1n l\u00e0 k\u1ebf th\u1eeba. Truy\u1ec1n c\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp con thay v\u00ec k\u1ebf th\u1eeba tr\u1ea1ng th\u00e1i.<\/li>\n
          • Gi\u1ea3i ph\u00e1p:<\/strong>S\u1eed d\u1ee5ng l\u1edbp tr\u1eebu t\u01b0\u1ee3ng cho h\u1ee3p \u0111\u1ed3ng v\u00e0 l\u1edbp c\u1ee5 th\u1ec3 cho tri\u1ec3n khai.<\/li>\n<\/ul>\n

            C\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u<\/h3>\n

            M\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p v\u1edbi qu\u00e1 nhi\u1ec1u c\u1ea5p \u0111\u1ed9 tr\u1edf n\u00ean kh\u00f3 g\u1ee1 l\u1ed7i. Vi\u1ec7c theo d\u00f5i m\u1ed9t l\u1eddi g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c qua m\u01b0\u1eddi l\u1edbp k\u1ebf th\u1eeba s\u1ebd l\u00e0m m\u1edd n\u01a1i th\u1ef1c s\u1ef1 n\u1eb1m logic.<\/p>\n

              \n
            • Gi\u1ea3i ph\u00e1p:<\/strong>L\u00e0m ph\u1eb3ng c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p. S\u1eed d\u1ee5ng mixin ho\u1eb7c \u0111\u1eb7c t\u00ednh \u1edf nh\u1eefng n\u01a1i ph\u00f9 h\u1ee3p \u0111\u1ec3 chia s\u1ebb h\u00e0nh vi m\u00e0 kh\u00f4ng c\u1ea7n l\u1ed3ng gh\u00e9p s\u00e2u.<\/li>\n
            • Gi\u1ea3i ph\u00e1p:<\/strong>Xem x\u00e9t l\u1ea1i m\u00f4 h\u00ecnh mi\u1ec1n. T\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con c\u00f3 th\u1ef1c s\u1ef1 k\u1ebf th\u1eeba t\u1eeb c\u00f9ng m\u1ed9t g\u1ed1c kh\u00f4ng?<\/li>\n<\/ul>\n

              Tr\u1ed9n l\u1eabn m\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m v\u00e0 m\u00f4 h\u00ecnh v\u1eadt l\u00fd<\/h3>\n

              Kh\u00f4ng tr\u1ed9n l\u1eabn m\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m (\u0111i\u1ec1u g\u00ec l\u00e0 mi\u1ec1n) v\u1edbi m\u00f4 h\u00ecnh v\u1eadt l\u00fd (c\u00e1ch c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u01b0u tr\u1eef). M\u1ed9t BankAccount<\/code>c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u00f3 th\u1ec3 tr\u00f4ng kh\u00e1c bi\u1ec7t so v\u1edbi m\u1ed9t DBRecord<\/code>c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p. S\u1eafp x\u1ebfp c\u00e1c l\u1edbp c\u1ee7a b\u1ea1n theo logic mi\u1ec1n tr\u01b0\u1edbc ti\u00ean.<\/p>\n

              So s\u00e1nh: K\u1ebf th\u1eeba vs. K\u1ebft h\u1ee3p \ud83d\udd04<\/h2>\n

              M\u1ed9t trong nh\u1eefng ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c tranh lu\u1eadn nhi\u1ec1u nh\u1ea5t trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng l\u00e0 vi\u1ec7c s\u1eed d\u1ee5ng k\u1ebf th\u1eeba hay k\u1ebft h\u1ee3p \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00e1i s\u1eed d\u1ee5ng m\u00e3. Trong khi k\u1ebf th\u1eeba x\u00e2y d\u1ef1ng m\u1ed1i quan h\u1ec7 “l\u00e0 m\u1ed9t”, th\u00ec k\u1ebft h\u1ee3p x\u00e2y d\u1ef1ng m\u1ed1i quan h\u1ec7 “c\u00f3 m\u1ed9t”.<\/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\u00e0-m\u1ed9t (c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p nghi\u00eam ng\u1eb7t)<\/td>\nC\u00f3-m\u1ed9t (s\u1eed d\u1ee5ng linh ho\u1ea1t)<\/td>\n<\/tr>\n
              T\u00ednh linh ho\u1ea1t<\/td>\nTh\u1ea5p (g\u1eafn k\u1ebft th\u1eddi gian bi\u00ean d\u1ecbch)<\/td>\nCao (t\u00ednh linh ho\u1ea1t th\u1eddi gian ch\u1ea1y)<\/td>\n<\/tr>\n
              T\u00e1c \u0111\u1ed9ng c\u1ee7a thay \u0111\u1ed5i<\/td>\nCao (thay \u0111\u1ed5i c\u01a1 s\u1edf \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea5t c\u1ea3)<\/td>\nTh\u1ea5p (th\u00e0nh ph\u1ea7n c\u00f3 th\u1ec3 thay th\u1ebf)<\/td>\n<\/tr>\n
              Bao \u0111\u00f3ng<\/td>\nY\u1ebfu (c\u00e1c th\u00e0nh vi\u00ean b\u1ea3o v\u1ec7 b\u1ecb ti\u1ebft l\u1ed9)<\/td>\nM\u1ea1nh (chi ti\u1ebft n\u1ed9i b\u1ed9 \u0111\u01b0\u1ee3c \u1ea9n)<\/td>\n<\/tr>\n
              Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/td>\nM\u1ed1i quan h\u1ec7 ki\u1ec3u th\u1ef1c s\u1ef1<\/td>\nT\u00e1i s\u1eed d\u1ee5ng h\u00e0nh vi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n c\u1ea7n m\u1ed9t Xe h\u01a1i<\/code> c\u00f3 m\u1ed9t \u0110\u1ed9ng c\u01a1<\/code>, vi\u1ec7c k\u1ebft h\u1ee3p th\u01b0\u1eddng t\u1ed1t h\u01a1n so v\u1edbi k\u1ebf th\u1eeba \u0110\u1ed9ng c\u01a1<\/code>. Tuy nhi\u00ean, n\u1ebfu b\u1ea1n c\u1ea7n x\u1eed l\u00fd t\u1ea5t c\u1ea3 c\u00e1c \u0110\u1ed9ng c\u01a1<\/code> ki\u1ec3u m\u1ed9t c\u00e1ch \u0111\u1ed3ng \u0111\u1ec1u (v\u00ed d\u1ee5, \u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n<\/code>, \u0110\u1ed9ng c\u01a1 x\u0103ng<\/code>) trong m\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n<\/code>giao di\u1ec7n, k\u1ebf th\u1eeba c\u00f3 th\u1ec3 l\u00e0 ph\u00f9 h\u1ee3p.<\/p>\n

              H\u01b0\u1edbng d\u1eabn tri\u1ec3n khai t\u1eebng b\u01b0\u1edbc \ud83d\udcdd<\/h2>\n

              Th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc sau \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t c\u1ea5u tr\u00fac t\u1ed5ng qu\u00e1t v\u1eefng ch\u1eafc m\u00e0 kh\u00f4ng l\u00e0m ph\u00e1t sinh s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

                \n
              1. X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m chung:<\/strong> Ph\u00e2n t\u00edch mi\u1ec1n \u0111\u1ec3 t\u00ecm c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi chung gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3.<\/li>\n
              2. X\u00e1c \u0111\u1ecbnh l\u1edbp c\u01a1 s\u1edf tr\u1eebu t\u01b0\u1ee3ng:<\/strong> T\u1ea1o m\u1ed9t l\u1edbp \u0111\u1ecbnh ngh\u0129a h\u1ee3p \u0111\u1ed3ng (giao di\u1ec7n) nh\u01b0ng c\u00f3 th\u1ec3 kh\u00f4ng tri\u1ec3n khai to\u00e0n b\u1ed9 logic.<\/li>\n
              3. Tri\u1ec3n khai c\u00e1c l\u1edbp c\u1ee5 th\u1ec3:<\/strong> T\u1ea1o c\u00e1c l\u1edbp con c\u1ee5 th\u1ec3 tri\u1ec3n khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng.<\/li>\n
              4. \u00c1p d\u1ee5ng \u0111a h\u00ecnh:<\/strong> Vi\u1ebft logic ch\u1ea5p nh\u1eadn ki\u1ec3u c\u01a1 s\u1edf nh\u01b0ng th\u1ef1c thi tri\u1ec3n khai l\u1edbp con m\u1ed9t c\u00e1ch \u0111\u1ed9ng.<\/li>\n
              5. T\u00e1i c\u1ea5u tr\u00fac \u0111\u1ec3 t\u0103ng t\u00ednh g\u1eafn k\u1ebft:<\/strong> Di chuy\u1ec3n ch\u1ee9c n\u0103ng \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 ph\u00f9 h\u1ee3p nh\u1ea5t. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ed9t l\u1edbp con, h\u00e3y di chuy\u1ec3n n\u00f3 v\u00e0o \u0111\u00f3.<\/li>\n
              6. T\u00e0i li\u1ec7u c\u00e1c m\u1ed1i quan h\u1ec7:<\/strong> R\u00f5 r\u00e0ng \u0111\u00e1nh d\u1ea5u c\u00e1c ph\u01b0\u01a1ng th\u1ee9c b\u1ecb ghi \u0111\u00e8 v\u00e0 l\u00fd do t\u1ea1i sao.<\/li>\n<\/ol>\n

                X\u1eed l\u00fd tr\u1ea1ng th\u00e1i v\u00e0 kh\u1edfi t\u1ea1o \u2699\ufe0f<\/h2>\n

                Qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i trong m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. Th\u1ee9 t\u1ef1 kh\u1edfi t\u1ea1o l\u00e0 quan tr\u1ecdng. Khi h\u00e0m t\u1ea1o l\u1edbp con ch\u1ea1y, h\u00e0m t\u1ea1o l\u1edbp c\u01a1 s\u1edf s\u1ebd ch\u1ea1y tr\u01b0\u1edbc. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o tr\u1ea1ng th\u00e1i c\u01a1 s\u1edf \u0111\u00e3 s\u1eb5n s\u00e0ng tr\u01b0\u1edbc khi logic l\u1edbp con \u0111\u01b0\u1ee3c th\u1ef1c thi.<\/p>\n

                Tuy nhi\u00ean, g\u1ecdi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u1ea3o t\u1eeb h\u00e0m t\u1ea1o l\u00e0 nguy hi\u1ec3m. N\u1ebfu l\u1edbp c\u01a1 s\u1edf g\u1ecdi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c b\u1ecb ghi \u0111\u00e8 trong l\u1edbp con, tri\u1ec3n khai l\u1edbp con c\u00f3 th\u1ec3 ch\u1ea1y tr\u01b0\u1edbc khi l\u1edbp con \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o ho\u00e0n to\u00e0n. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i tham chi\u1ebfu null ho\u1eb7c tr\u1ea1ng th\u00e1i kh\u00f4ng nh\u1ea5t qu\u00e1n.<\/p>\n

                  \n
                • Quy t\u1eafc:<\/strong>Tr\u00e1nh g\u1ecdi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u1ea3o trong h\u00e0m t\u1ea1o.<\/li>\n
                • Quy t\u1eafc:<\/strong>Kh\u1edfi t\u1ea1o tr\u1ea1ng th\u00e1i trong m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c chuy\u00ean d\u1ee5nginit()<\/code> ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c g\u1ecdi sau khi x\u00e2y d\u1ef1ng.<\/li>\n
                • Quy t\u1eafc:<\/strong>S\u1eed d\u1ee5ng c\u00e1c tr\u01b0\u1eddng final cho c\u00e1c h\u1eb1ng s\u1ed1 kh\u00f4ng thay \u0111\u1ed5i trong su\u1ed1t v\u00f2ng \u0111\u1eddi.<\/li>\n<\/ul>\n

                  C\u00e1c m\u1eabu n\u00e2ng cao \ud83e\udde9<\/h2>\n

                  Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, k\u1ebf th\u1eeba chu\u1ea9n c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ee7. C\u00e1c m\u1eabu n\u00e2ng cao gi\u00fap qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p.<\/p>\n

                  Mixins v\u00e0 Traits<\/h3>\n

                  Khi m\u1ed9t l\u1edbp c\u1ea7n ch\u1ee9c n\u0103ng t\u1eeb nhi\u1ec1u ngu\u1ed3n kh\u00f4ng li\u00ean quan, k\u1ebf th\u1eeba \u0111a l\u1edbp c\u00f3 th\u1ec3 tr\u1edf n\u00ean l\u1ed9n x\u1ed9n (v\u1ea5n \u0111\u1ec1 ‘Kim c\u01b0\u01a1ng’). Mixins ho\u1eb7c Traits cho ph\u00e9p m\u1ed9t l\u1edbp bao g\u1ed3m c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ee5 th\u1ec3 m\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7 ‘l\u00e0 m\u1ed9t’ nghi\u00eam ng\u1eb7t. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y vi\u1ec7c t\u00e1i s\u1eed d\u1ee5ng ngang thay v\u00ec k\u1ebf th\u1eeba d\u1ecdc.<\/p>\n

                  Nh\u00e0 m\u00e1y tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n

                  N\u1ebfu c\u1ea5u tr\u00fac c\u1ee7a b\u1ea1n li\u00ean quan \u0111\u1ebfn vi\u1ec7c t\u1ea1o ra c\u00e1c gia \u0111\u00ecnh \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan (v\u00ed d\u1ee5 nh\u01b0UIComponents<\/code> cho Windows so v\u1edbiTh\u00e0nh ph\u1ea7n giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng<\/code> cho Linux), h\u00e3y s\u1eed d\u1ee5ng m\u1eabu Abstract Factory. \u0110i\u1ec1u n\u00e0y \u0111\u00f3ng g\u00f3i logic t\u1ea1o ra ph\u00eda sau c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p, gi\u00fap c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p lu\u00f4n s\u1ea1ch s\u1ebd v\u00e0 t\u1eadp trung v\u00e0o h\u00e0nh vi.<\/p>\n

                  Ki\u1ec3m th\u1eed c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \ud83e\uddea<\/h2>\n

                  Ki\u1ec3m th\u1eed m\u00e3 k\u1ebf th\u1eeba \u0111\u00f2i h\u1ecfi c\u00e1c chi\u1ebfn l\u01b0\u1ee3c c\u1ee5 th\u1ec3. B\u1ea1n ph\u1ea3i ki\u1ec3m th\u1eed c\u1ea3 l\u1edbp c\u01a1 s\u1edf v\u00e0 c\u00e1c l\u1edbp con.<\/p>\n

                    \n
                  • Ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb:<\/strong> Ki\u1ec3m th\u1eed t\u1eebng l\u1edbp con \u0111\u1ed9c l\u1eadp \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ghi \u0111\u00e8 ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang.<\/li>\n
                  • Ki\u1ec3m th\u1eed t\u00edch h\u1ee3p:<\/strong> X\u00e1c minh r\u1eb1ng l\u1edbp c\u01a1 s\u1edf ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u00f4ng qua giao di\u1ec7n l\u1edbp con.<\/li>\n
                  • Ki\u1ec3m th\u1eed h\u1ed3i quy:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c thay \u0111\u1ed5i v\u00e0o l\u1edbp c\u01a1 s\u1edf kh\u00f4ng l\u00e0m h\u1ecfng c\u00e1c l\u1edbp con hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

                    Ki\u1ec3m th\u1eed t\u1ef1 \u0111\u1ed9ng l\u00e0 \u0111i\u1ec1u then ch\u1ed1t \u1edf \u0111\u00e2y. Ki\u1ec3m th\u1eed th\u1ee7 c\u00f4ng th\u01b0\u1eddng b\u1ecf s\u00f3t c\u00e1c tr\u01b0\u1eddng h\u1ee3p bi\u00ean do t\u00ednh \u0111a h\u00ecnh g\u00e2y ra. S\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng gi\u1ea3 \u0111\u1ec3 m\u00f4 ph\u1ecfng h\u00e0nh vi l\u1edbp c\u01a1 s\u1edf khi ki\u1ec3m th\u1eed c\u00e1c l\u1edbp con c\u1ee5 th\u1ec3.<\/p>\n

                    Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho b\u1ea3o tr\u00ec d\u00e0i h\u1ea1n \ud83d\udd0d<\/h2>\n

                    Khi d\u1ef1 \u00e1n ph\u00e1t tri\u1ec3n, c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u00f3 th\u1ec3 c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh. T\u00e0i li\u1ec7u \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t \u1edf \u0111\u00e2y. M\u1ed7i c\u1ea5p \u0111\u1ed9 trong c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p n\u00ean c\u00f3 ch\u00fa th\u00edch gi\u1ea3i th\u00edch m\u1ee5c \u0111\u00edch c\u1ee7a n\u00f3.<\/p>\n

                      \n
                    • Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong> Theo d\u00f5i s\u00e1t sao c\u00e1c thay \u0111\u1ed5i v\u00e0o l\u1edbp c\u01a1 s\u1edf. Vi\u1ec7c refactoring l\u1edbp cha l\u00e0 thao t\u00e1c c\u00f3 r\u1ee7i ro cao.<\/li>\n
                    • Xem x\u00e9t m\u00e3 ngu\u1ed3n:<\/strong> Y\u00eau c\u1ea7u ki\u1ec3m tra k\u1ef9 l\u01b0\u1ee1ng h\u01a1n khi th\u00eam c\u00e1c l\u1edbp con m\u1edbi. \u0110\u1ea3m b\u1ea3o ch\u00fang kh\u00f4ng vi ph\u1ea1m Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t.<\/li>\n
                    • Chuy\u1ec3n \u0111\u1ed5i l\u1ed7i th\u1eddi:<\/strong> N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c trong l\u1edbp c\u01a1 s\u1edf kh\u00f4ng c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, h\u00e3y \u0111\u00e1nh d\u1ea5u n\u00f3 l\u00e0 l\u1ed7i th\u1eddi v\u1edbi th\u1eddi gian r\u00f5 r\u00e0ng \u0111\u1ec3 lo\u1ea1i b\u1ecf thay v\u00ec x\u00f3a ngay l\u1eadp t\u1ee9c.<\/li>\n<\/ul>\n

                      C\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1i qu\u00e1t l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang mang l\u1ea1i c\u1ea5u tr\u00fac v\u00e0 s\u1ee9c m\u1ea1nh khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch. Tuy nhi\u00ean, ch\u00fang \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. M\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t s\u1ebd \u0111\u01a1n gi\u1ea3n h\u00f3a h\u1ec7 th\u1ed1ng, trong khi m\u1ed9t c\u1ea5u tr\u00fac thi\u1ebft k\u1ebf k\u00e9m s\u1ebd t\u1ea1o ra m\u1ea1ng l\u01b0\u1edbi ph\u1ee5 thu\u1ed9c kh\u00f3 t\u00e1ch r\u1eddi. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc v\u00e0 s\u1eed d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c k\u1ebft h\u1ee3p m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng v\u1eeba linh ho\u1ea1t v\u1eeba v\u1eefng ch\u1eafc.<\/p>\n

                      M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ed1i \u0111a h\u00f3a s\u1ed1 l\u01b0\u1ee3ng c\u1ea5p \u0111\u1ed9 hay \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7. M\u1ee5c ti\u00eau l\u00e0 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c l\u0129nh v\u1ef1c \u1ee9ng d\u1ee5ng. Khi m\u00e3 ngu\u1ed3n ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf c\u1ee7a logic kinh doanh, c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u1ebd ph\u00e1t huy \u0111\u00fang m\u1ee5c \u0111\u00edch. H\u00e3y gi\u1eef n\u00f3 \u0111\u01a1n gi\u1ea3n, d\u1ec5 ki\u1ec3m th\u1eed v\u00e0 lu\u00f4n \u0111\u1ed3ng b\u1ed9 v\u1edbi c\u00e1c y\u00eau c\u1ea7u c\u1ed1t l\u00f5i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                      Trong b\u1ed1i c\u1ea3nh Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOAD), \u00edt c\u01a1 ch\u1ebf n\u00e0o v\u1eeba n\u1ec1n t\u1ea3ng l\u1ea1i v\u1eeba tinh t\u1ebf nh\u01b0c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1i qu\u00e1t. Nh\u1eefng c\u1ea5u…<\/p>\n","protected":false},"author":1,"featured_media":1927,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"C\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1i qu\u00e1t trong H\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \ud83c\udfd7\ufe0f","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1i qu\u00e1t trong Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. H\u1ecdc v\u1ec1 k\u1ebf th\u1eeba, \u0111a h\u00ecnh v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed1t nh\u1ea5t \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[94],"tags":[87,93],"class_list":["post-1926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-object-oriented-analysis-and-design","tag-academic","tag-object-oriented-analysis-and-design"],"yoast_head":"\nC\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1i qu\u00e1t trong H\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \ud83c\udfd7\ufe0f<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1i qu\u00e1t trong Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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