{"id":139,"date":"2026-04-01T08:17:04","date_gmt":"2026-04-01T08:17:04","guid":{"rendered":"https:\/\/www.go-notes.com\/vn\/inheritance-polymorphism-uml-class-diagrams\/"},"modified":"2026-04-01T08:17:04","modified_gmt":"2026-04-01T08:17:04","slug":"inheritance-polymorphism-uml-class-diagrams","status":"publish","type":"post","link":"https:\/\/www.go-notes.com\/vn\/inheritance-polymorphism-uml-class-diagrams\/","title":{"rendered":"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 K\u1ebf th\u1eeba v\u00e0 \u0110a h\u00ecnh trong S\u01a1 \u0111\u1ed3 L\u1edbp UML"},"content":{"rendered":"

L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP) ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o c\u00e1c nguy\u00ean t\u1eafc k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 t\u1ea1o ra c\u00e1c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec. Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y, s\u01a1 \u0111\u1ed3 l\u1edbp UML \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n. Hi\u1ec3u c\u00e1ch bi\u1ec3u di\u1ec5n c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p n\u00e0y m\u1ed9t c\u00e1ch tr\u1ef1c quan l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 giao ti\u1ebfp r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c b\u00ean li\u00ean quan v\u00e0 c\u00e1c nh\u00f3m k\u1ef9 thu\u1eadt. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c c\u01a1 ch\u1ebf c\u1ee7a k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh trong b\u1ed1i c\u1ea3nh UML, cung c\u1ea5p m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n

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

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

K\u1ebf th\u1eeba l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf m\u00e0 m\u1ed9t l\u1edbp m\u1edbi \u0111\u01b0\u1ee3c tr\u00edch xu\u1ea5t c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi t\u1eeb m\u1ed9t l\u1edbp hi\u1ec7n c\u00f3. M\u1ed1i quan h\u1ec7 n\u00e0y thi\u1ebft l\u1eadp m\u1ed9t th\u1ee9 b\u1eadc, cho ph\u00e9p t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n v\u00e0 t\u1ed5 ch\u1ee9c logic. Trong UML, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi ch\u00ednh th\u1ee9c l\u00e0t\u1ed5ng qu\u00e1t h\u00f3a<\/strong>. N\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 “L\u00e0-m\u1ed9t”. V\u00ed d\u1ee5, m\u1ed9tXe h\u01a1i<\/code> l\u00e0 m\u1ed9tPh\u01b0\u01a1ng ti\u1ec7n<\/code>. C\u1ea5u tr\u00fac n\u00e0y gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 cho ph\u00e9p t\u1eadp trung h\u00f3a c\u00e1c thu\u1ed9c t\u00ednh chung.<\/p>\n

M\u1ed1i quan h\u1ec7 T\u1ed5ng qu\u00e1t h\u00f3a \ud83d\udcd0<\/h3>\n

H\u1ea1t nh\u00e2n c\u1ee7a k\u1ebf th\u1eeba n\u1eb1m \u1edf m\u1ed1i quan h\u1ec7 t\u1ed5ng qu\u00e1t h\u00f3a. Khi b\u1ea1n \u0111\u1ecbnh ngh\u0129a m\u1ed9t l\u1edbp si\u00eau (hay l\u1edbp cha), b\u1ea1n \u0111ang thi\u1ebft l\u1eadp m\u1ed9t h\u1ee3p \u0111\u1ed3ng m\u00e0 c\u00e1c l\u1edbp con (hay l\u1edbp con) ph\u1ea3i tu\u00e2n theo. M\u1ed1i quan h\u1ec7 n\u00e0y mang t\u00ednh h\u01b0\u1edbng. M\u0169i t\u00ean trong s\u01a1 \u0111\u1ed3 UML ch\u1ec9 t\u1eeb l\u1edbp con \u0111\u1ebfn l\u1edbp si\u00eau. T\u00ednh h\u01b0\u1edbng n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c lu\u1ed3ng ph\u1ee5 thu\u1ed9c v\u00e0 tr\u00e1ch nhi\u1ec7m.<\/p>\n

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  • L\u1edbp si\u00eau:<\/strong> L\u1edbp t\u1ed5ng qu\u00e1t ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c chung.<\/li>\n
  • L\u1edbp con:<\/strong> L\u1edbp chuy\u00ean bi\u1ec7t k\u1ebf th\u1eeba t\u1eeb l\u1edbp si\u00eau.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> C\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chia s\u1ebb trong to\u00e0n b\u1ed9 th\u1ee9 b\u1eadc.<\/li>\n
  • Ph\u01b0\u01a1ng th\u1ee9c:<\/strong> C\u00e1c h\u00e0nh vi c\u00f3 th\u1ec3 b\u1ecb ghi \u0111\u00e8 ho\u1eb7c m\u1edf r\u1ed9ng.<\/li>\n<\/ul>\n

    Kh\u00e1i ni\u1ec7m “L\u00e0-m\u1ed9t” \ud83e\udde0<\/h3>\n

    Ki\u1ec3m tra m\u1ed1i quan h\u1ec7 k\u1ebf th\u1eeba th\u01b0\u1eddng d\u1ef1a v\u00e0o b\u00e0i ki\u1ec3m tra “L\u00e0-m\u1ed9t”. N\u1ebfu b\u1ea1n c\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng l\u1edbp con l\u00e0 m\u1ed9t ki\u1ec3u c\u1ee7a l\u1edbp si\u00eau m\u00e0 kh\u00f4ng l\u00e0m cho c\u00e2u n\u00f3i tr\u1edf n\u00ean sai, th\u00ec k\u1ebf th\u1eeba l\u00e0 ph\u00f9 h\u1ee3p. H\u00e3y xem x\u00e9t c\u00e1c v\u00ed d\u1ee5 sau:<\/p>\n

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    • Nh\u00e2n vi\u00ean<\/code> l\u00e0 m\u1ed9tNg\u01b0\u1eddi<\/code> \u2705<\/li>\n
    • Gi\u00e1m \u0111\u1ed1c<\/code> l\u00e0 m\u1ed9tNh\u00e2n vi\u00ean<\/code> \u2705<\/li>\n
    • Xe h\u01a1i<\/code> l\u00e0 m\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n<\/code> \u2705<\/li>\n
    • \u0110\u1ed9ng c\u01a1<\/code> l\u00e0 m\u1ed9t Xe h\u01a1i<\/code> \u274c (\u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 \u201cC\u00f3-M\u1ed9t\u201d, y\u00eau c\u1ea7u s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p ho\u1eb7c t\u00edch h\u1ee3p).<\/li>\n<\/ul>\n

      S\u1eed d\u1ee5ng k\u1ebf th\u1eeba sai c\u00e1ch c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c c\u1ea5u tr\u00fac m\u00e3 c\u1ee9ng nh\u1eafc, kh\u00f3 thay \u0111\u1ed5i. R\u1ea5t quan tr\u1ecdng l\u00e0 ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u1ea5p b\u1eadc h\u1ee3p l\u00fd tr\u01b0\u1edbc khi v\u1ebd c\u00e1c m\u1ed1i quan h\u1ec7.<\/p>\n

      Tr\u1ef1c quan h\u00f3a k\u1ebf th\u1eeba trong UML \ud83d\udee0\ufe0f<\/h2>\n

      K\u00fd hi\u1ec7u cho k\u1ebf th\u1eeba \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a tr\u00ean c\u00e1c c\u00f4ng c\u1ee5 UML. Nh\u1eadn bi\u1ebft c\u00e1c d\u1ea5u hi\u1ec7u tr\u1ef1c quan \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea5t k\u1ef3 nh\u00e0 ph\u00e1t tri\u1ec3n n\u00e0o \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ec1u hi\u1ec3u ki\u1ebfn tr\u00fac ngay l\u1eadp t\u1ee9c.<\/p>\n

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      • \u0110\u01b0\u1eddng li\u1ec1n:<\/strong>Ch\u1ec9 ra m\u1ed1i quan h\u1ec7 tr\u1ef1c ti\u1ebfp.<\/li>\n
      • \u0110\u1ea7u m\u0169i t\u00ean h\u00ecnh tam gi\u00e1c r\u1ed7ng:<\/strong>Ch\u1ec9 v\u1ec1 ph\u00eda si\u00eau l\u1edbp (cha).<\/li>\n
      • H\u1ed9p l\u1edbp:<\/strong>C\u00e1c h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n cho T\u00ean l\u1edbp, Thu\u1ed9c t\u00ednh v\u00e0 Ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n<\/ul>\n

        Khi nhi\u1ec1u l\u1edbp con k\u1ebf th\u1eeba t\u1eeb m\u1ed9t si\u00eau l\u1edbp duy nh\u1ea5t, s\u01a1 \u0111\u1ed3 s\u1ebd hi\u1ec3n th\u1ecb c\u1ea5u tr\u00fac c\u00e2y. Th\u1ee9 t\u1ef1 ph\u00e2n c\u1ea5p tr\u1ef1c quan n\u00e0y gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c tr\u00e1ch nhi\u1ec7m chung v\u00e0 c\u00e1c \u0111\u1eb7c t\u1ea3 ri\u00eang bi\u1ec7t.<\/p>\n

        Gi\u1ea3i th\u00edch v\u1ec1 \u0111a h\u00ecnh \ud83d\udd04<\/h2>\n

        \u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a c\u00e1c l\u1edbp kh\u00e1c nhau \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t si\u00eau l\u1edbp chung. Kh\u1ea3 n\u0103ng n\u00e0y t\u1ea1o ra t\u00ednh linh ho\u1ea1t trong thi\u1ebft k\u1ebf, cho ph\u00e9p c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1ea1t \u0111\u1ed9ng kh\u00e1c nhau t\u00f9y theo \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 ch\u00fang thao t\u00e1c. Trong UML, \u0111a h\u00ecnh th\u01b0\u1eddng \u0111\u01b0\u1ee3c ng\u1ea7m hi\u1ec3u th\u00f4ng qua k\u1ebf th\u1eeba, nh\u01b0ng c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 l\u00e0m n\u1ed5i b\u1eadt giao di\u1ec7n v\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng.<\/p>\n

        \u0110a h\u00ecnh th\u1eddi gian bi\u00ean d\u1ecbch so v\u1edbi th\u1eddi gian ch\u1ea1y \u23f1\ufe0f<\/h3>\n

        Hi\u1ec3u r\u00f5 th\u1eddi \u0111i\u1ec3m x\u1ea3y ra \u0111a h\u00ecnh l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c. Hai d\u1ea1ng ch\u00ednh l\u00e0:<\/p>\n

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        • Th\u1eddi gian bi\u00ean d\u1ecbch (T\u0129nh):<\/strong>C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c. C\u00e1c ph\u01b0\u01a1ng th\u1ee9c kh\u00e1c nhau chia s\u1ebb c\u00f9ng t\u00ean nh\u01b0ng kh\u00e1c nhau v\u1ec1 tham s\u1ed1. \u0110i\u1ec1u n\u00e0y \u00edt li\u00ean quan \u0111\u1ebfn k\u1ebf th\u1eeba h\u01a1n l\u00e0 \u0111\u1ebfn k\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n
        • Th\u1eddi gian ch\u1ea1y (\u0110\u1ed9ng):<\/strong>C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c. L\u1edbp con cung c\u1ea5p m\u1ed9t tri\u1ec3n khai c\u1ee5 th\u1ec3 cho m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong si\u00eau l\u1edbp c\u1ee7a n\u00f3. \u0110\u00e2y l\u00e0 c\u1ed1t l\u00f5i c\u1ee7a \u0111a h\u00ecnh trong c\u00e1c c\u1ea5p b\u1eadc k\u1ebf th\u1eeba.<\/li>\n<\/ul>\n

          Ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c so v\u1edbi Ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c \ud83d\udd04<\/h3>\n

          Ph\u00e2n bi\u1ec7t hai kh\u00e1i ni\u1ec7m n\u00e0y gi\u00fap tr\u00e1nh nh\u1ea7m l\u1eabn trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf. Ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c x\u1ea3y ra trong m\u1ed9t l\u1edbp duy nh\u1ea5t, trong khi ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c x\u1ea3y ra gi\u1eefa c\u00e1c l\u1edbp trong m\u1ed9t c\u1ea5p b\u1eadc.<\/p>\n\n\n\n\n\n\n\n\n
          T\u00ednh n\u0103ng<\/th>\nGhi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c<\/th>\nGhi \u0111\u00e8<\/th>\n<\/tr>\n<\/thead>\n
          B\u1ed1i c\u1ea3nh<\/td>\nL\u1edbp gi\u1ed1ng nhau<\/td>\nL\u1edbp cha v\u00e0 l\u1edbp con<\/td>\n<\/tr>\n
          K\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c<\/td>\nTham s\u1ed1 kh\u00e1c nhau<\/td>\nTham s\u1ed1 gi\u1ed1ng nhau<\/td>\n<\/tr>\n
          Ki\u1ec3u tr\u1ea3 v\u1ec1<\/td>\nC\u00f3 th\u1ec3 kh\u00e1c nhau<\/td>\nPh\u1ea3i gi\u1ed1ng nhau<\/td>\n<\/tr>\n
          K\u00fd hi\u1ec7u UML<\/td>\nTh\u01b0\u1eddng ng\u1ea7m \u0111\u1ecbnh trong h\u1ed9p l\u1edbp<\/td>\nHi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng v\u1edbi t\u1eeb kh\u00f3a override<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Chi ti\u1ebft k\u00fd hi\u1ec7u UML cho \u0111a h\u00ecnh \ud83d\udcdd<\/h2>\n

          \u0110\u1ec3 bi\u1ec3u di\u1ec5n ch\u00ednh x\u00e1c h\u00e0nh vi \u0111a h\u00ecnh, c\u00e1c ch\u00fa th\u00edch c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u01a1 \u0111\u1ed3 l\u1edbp. Nh\u1eefng chi ti\u1ebft n\u00e0y l\u00e0m r\u00f5 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o l\u00e0 tr\u1eebu t\u01b0\u1ee3ng v\u00e0 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o l\u00e0 tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n

          L\u1edbp v\u00e0 ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng \ud83d\udccc<\/h3>\n

          C\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o tr\u1ef1c ti\u1ebfp. Ch\u00fang \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1eabu cho c\u00e1c l\u1edbp con. Trong UML, t\u00ean c\u1ee7a m\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng in \u0111\u1eadm nghi\u00eang<\/em>. T\u01b0\u01a1ng t\u1ef1, c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng c\u0169ng \u0111\u01b0\u1ee3c in nghi\u00eang. D\u1ea5u hi\u1ec7u th\u1ecb gi\u00e1c n\u00e0y th\u00f4ng b\u00e1o cho nh\u00e0 ph\u00e1t tri\u1ec3n r\u1eb1ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c tri\u1ec3n khai b\u1edfi b\u1ea5t k\u1ef3 l\u1edbp con c\u1ee5 th\u1ec3 n\u00e0o.<\/p>\n

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          • L\u1edbp tr\u1eebu t\u01b0\u1ee3ng:<\/strong> PaymentProcessor<\/code><\/em><\/li>\n
          • Ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng:<\/strong> processPayment()<\/code><\/em><\/li>\n<\/ul>\n

            Giao di\u1ec7n \ud83c\udf10<\/h3>\n

            Trong khi k\u1ebf th\u1eeba cho ph\u00e9p t\u00e1i s\u1eed d\u1ee5ng m\u00e3, giao di\u1ec7n \u0111\u1ecbnh ngh\u0129a m\u1ed9t h\u1ee3p \u0111\u1ed3ng. M\u1ed9t l\u1edbp c\u00f3 th\u1ec3 tri\u1ec3n khai nhi\u1ec1u giao di\u1ec7n, ngay c\u1ea3 khi n\u00f3 ch\u1ec9 k\u1ebf th\u1eeba t\u1eeb m\u1ed9t si\u00eau l\u1edbp. Trong UML, giao di\u1ec7n th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u1ed9p l\u1edbp c\u00f3 ki\u1ec3u d\u00e1ng <<interface>>. Ngo\u00e0i ra, c\u0169ng c\u00f3 th\u1ec3 d\u00f9ng h\u1ed9p l\u1edbp v\u1edbi bi\u1ec3u t\u01b0\u1ee3ng c\u1ee5 th\u1ec3.<\/p>\n

              \n
            • M\u1ed1i quan h\u1ec7 tri\u1ec3n khai:<\/strong>\u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean r\u1ed7ng h\u01b0\u1edbng v\u1ec1 giao di\u1ec7n.<\/li>\n
            • M\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng:<\/strong>\u0110\u00f4i khi \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t giao di\u1ec7n.<\/li>\n<\/ul>\n

              C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho m\u00f4 h\u00ecnh h\u00f3a l\u1edbp \u2705<\/h2>\n

              Thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. Vi\u1ec7c tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ea3m b\u1ea3o m\u00f4 h\u00ecnh v\u1eabn d\u1ec5 hi\u1ec3u v\u00e0 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng theo th\u1eddi gian.<\/p>\n

                \n
              • H\u1ea1n ch\u1ebf \u0111\u1ed9 s\u00e2u:<\/strong>C\u00e1c c\u1ea5u tr\u00fac k\u1ebf th\u1eeba s\u00e2u tr\u1edf n\u00ean kh\u00f3 qu\u1ea3n l\u00fd. H\u00e3y h\u01b0\u1edbng \u0111\u1ebfn t\u1ed1i \u0111a 2-3 c\u1ea5p \u0111\u1ed9 \u0111\u1ed9 s\u00e2u.<\/li>\n
              • \u01afu ti\u00ean k\u1ebft h\u1ee3p:<\/strong>N\u1ebfu m\u1ed1i quan h\u1ec7 l\u00e0 ‘C\u00f3-M\u1ed9t’ thay v\u00ec ‘L\u00e0-M\u1ed9t’, h\u00e3y s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p ho\u1eb7c t\u1ed5ng h\u1ee3p thay v\u00ec k\u1ebf th\u1eeba.<\/li>\n
              • Tr\u00e1ch nhi\u1ec7m \u0111\u01a1n nh\u1ea5t:<\/strong>M\u1ed7i l\u1edbp n\u00ean c\u00f3 m\u1ed9t l\u00fd do duy nh\u1ea5t \u0111\u1ec3 thay \u0111\u1ed5i. Tr\u00e1nh t\u1ea1o ra c\u00e1c l\u1edbp ‘Th\u01b0\u1ee3ng \u0110\u1ebf’ l\u00e0m qu\u00e1 nhi\u1ec1u vi\u1ec7c.<\/li>\n
              • Bao \u0111\u00f3ng:<\/strong>\u1ea8n chi ti\u1ebft tri\u1ec3n khai. S\u1eed d\u1ee5ng c\u00e1c b\u1ed9 gi\u1edbi h\u1ea1n truy c\u1eadp (+<\/code> cho c\u00f4ng khai, -<\/code> cho ri\u00eang t\u01b0) m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng.<\/li>\n
              • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>Duy tr\u00ec c\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp v\u00e0 m\u1ed1i quan h\u1ec7.<\/li>\n<\/ul>\n

                Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn \u26a0\ufe0f<\/h2>\n

                Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng g\u1eb7p l\u1ed7i khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p. Nh\u1eadn di\u1ec7n nh\u1eefng sai l\u1ea7m n\u00e0y s\u1edbm c\u00f3 th\u1ec3 gi\u00fap ti\u1ebft ki\u1ec7m c\u00f4ng s\u1ee9c t\u00e1i c\u1ea5u tr\u00fac \u0111\u00e1ng k\u1ec3 sau n\u00e0y.<\/p>\n

                V\u1ea5n \u0111\u1ec1 L\u1edbp C\u01a1 s\u1edf D\u1ec5 G\u00e3y \ud83d\udc94<\/h3>\n

                \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi m\u1ed9t thay \u0111\u1ed5i trong l\u1edbp cha l\u00e0m h\u1ecfng ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c l\u1edbp con. V\u00ec c\u00e1c l\u1edbp con ph\u1ee5 thu\u1ed9c v\u00e0o tri\u1ec3n khai n\u1ed9i b\u1ed9 c\u1ee7a l\u1edbp cha, vi\u1ec7c thay \u0111\u1ed5i cha c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u1ec7 qu\u1ea3 kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u \u0111i\u1ec1u n\u00e0y, h\u00e3y d\u1ef1a v\u00e0o giao di\u1ec7n v\u00e0 l\u1edbp tr\u1eebu t\u01b0\u1ee3ng n\u01a1i h\u1ee3p \u0111\u1ed3ng \u1ed5n \u0111\u1ecbnh, nh\u01b0ng tri\u1ec3n khai th\u00ec kh\u00f4ng.<\/p>\n

                Ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n \ud83d\udd01<\/h3>\n

                C\u00e1c l\u1edbp kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o nhau theo v\u00f2ng tr\u00f2n. N\u1ebfu l\u1edbp A ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp B, v\u00e0 l\u1edbp B ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp A, h\u1ec7 th\u1ed1ng s\u1ebd tr\u1edf n\u00ean g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng cho th\u1ea5y m\u1ed9t l\u1ed7i thi\u1ebft k\u1ebf n\u01a1i c\u00e1c tr\u00e1ch nhi\u1ec7m kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1ch r\u00f5 r\u00e0ng.<\/p>\n

                S\u1eed d\u1ee5ng k\u1ebf th\u1eeba sai m\u1ee5c \u0111\u00edch \u0111\u1ec3 t\u00e1i s\u1eed d\u1ee5ng m\u00e3 \ud83d\udd04<\/h3>\n

                K\u1ebf th\u1eeba th\u01b0\u1eddng b\u1ecb l\u1ea1m d\u1ee5ng ch\u1ec9 \u0111\u1ec3 sao ch\u00e9p m\u00e3. N\u1ebfu hai l\u1edbp chia s\u1ebb ch\u1ee9c n\u0103ng nh\u01b0ng kh\u00f4ng c\u00f3 m\u1ed1i quan h\u1ec7 ‘L\u00e0-M\u1ed9t’, th\u00ec k\u1ebf th\u1eeba l\u00e0 c\u00f4ng c\u1ee5 sai. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0y, h\u00e3y tr\u00edch xu\u1ea5t logic chung v\u00e0o m\u1ed9t l\u1edbp ti\u1ec7n \u00edch ho\u1eb7c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p \u0111\u1ec3 \u1ee7y quy\u1ec1n c\u00e1c nhi\u1ec7m v\u1ee5.<\/p>\n

                So s\u00e1nh: K\u1ebf th\u1eeba so v\u1edbi K\u1ebft h\u1ee3p \ud83d\udcca<\/h2>\n

                Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa k\u1ebf th\u1eeba v\u00e0 k\u1ebft h\u1ee3p l\u00e0 m\u1ed9t trong nh\u1eefng quy\u1ebft \u0111\u1ecbnh ph\u1ed5 bi\u1ebfn nh\u1ea5t trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. K\u1ebft h\u1ee3p th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean v\u00ec t\u00ednh linh ho\u1ea1t, trong khi k\u1ebf th\u1eeba ph\u00f9 h\u1ee3p h\u01a1n cho c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p ki\u1ec3u d\u1eef li\u1ec7u.<\/p>\n\n\n\n\n\n\n\n\n\n
                Ti\u00eau ch\u00ed<\/th>\nK\u1ebf th\u1eeba<\/th>\nK\u1ebft h\u1ee3p<\/th>\n<\/tr>\n<\/thead>\n
                M\u1ed1i quan h\u1ec7<\/td>\n\u201cL\u00e0-M\u1ed9t\u201d<\/td>\n\u201cC\u00f3-M\u1ed9t\u201d<\/td>\n<\/tr>\n
                T\u00ednh linh ho\u1ea1t<\/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<\/td>\nC\u00f3, th\u00f4ng qua th\u1ee9 t\u1ef1 ph\u00e2n c\u1ea5p<\/td>\nC\u00f3, th\u00f4ng qua \u1ee7y quy\u1ec1n<\/td>\n<\/tr>\n
                \u0110\u01b0\u1eddng UML<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi tam gi\u00e1c r\u1ed7ng<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh thoi \u0111\u1ea7y<\/td>\n<\/tr>\n
                V\u00f2ng \u0111\u1eddi<\/td>\n\u0110\u1ed9c l\u1eadp<\/td>\nPh\u1ee5 thu\u1ed9c (ph\u1ea7n con s\u1ebd ch\u1ebft khi cha ch\u1ebft)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                C\u00e1c t\u00ecnh hu\u1ed1ng n\u00e2ng cao \ud83d\ude80<\/h2>\n

                C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p th\u01b0\u1eddng y\u00eau c\u1ea7u x\u1eed l\u00fd c\u00e1c t\u00ecnh hu\u1ed1ng k\u1ebf th\u1eeba nhi\u1ec1u l\u1edbp ho\u1eb7c c\u00e1c giao di\u1ec7n tr\u1eebu t\u01b0\u1ee3ng. Trong khi UML chu\u1ea9n kh\u00f4ng h\u1ed7 tr\u1ee3 k\u1ebf th\u1eeba nhi\u1ec1u l\u1edbp cho c\u00e1c l\u1edbp trong t\u1ea5t c\u1ea3 c\u00e1c ng\u00f4n ng\u1eef (nh\u01b0 Java), n\u00f3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 trong m\u1ed9t s\u1ed1 ng\u00f4n ng\u1eef kh\u00e1c (nh\u01b0 C++). Trong s\u01a1 \u0111\u1ed3, m\u1ed9t l\u1edbp con c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u \u0111\u01b0\u1eddng k\u1ebf th\u1eeba ch\u1ec9 \u0111\u1ebfn nhi\u1ec1u l\u1edbp cha.<\/p>\n

                Mixins v\u00e0 Traits \ud83e\udde9<\/h3>\n

                Trong c\u00e1c m\u1eabu thi\u1ebft k\u1ebf hi\u1ec7n \u0111\u1ea1i, mixins ho\u1eb7c traits cho ph\u00e9p m\u1ed9t l\u1edbp k\u1ebf th\u1eeba h\u00e0nh vi t\u1eeb nhi\u1ec1u ngu\u1ed3n m\u00e0 kh\u00f4ng c\u1ea7n k\u1ebf th\u1eeba to\u00e0n b\u1ed9. Trong UML, ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1c h\u1ed9p l\u1edbp ri\u00eang bi\u1ec7t \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i b\u1eb1ng \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t c\u00f3 m\u1ed9t ki\u1ec3u \u0111\u1eb7c bi\u1ec7t ch\u1ec9 ra b\u1ea3n ch\u1ea5t c\u1ee7a mixin.<\/p>\n

                Th\u1ef1c hi\u1ec7n giao di\u1ec7n \ud83d\udee1\ufe0f<\/h3>\n

                Khi m\u1ed9t l\u1edbp th\u1ef1c hi\u1ec7n nhi\u1ec1u giao di\u1ec7n, n\u00f3 tu\u00e2n theo nhi\u1ec1u h\u1ee3p \u0111\u1ed3ng. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng nhi\u1ec1u \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t v\u1edbi c\u00e1c tam gi\u00e1c r\u1ed7ng ch\u1ec9 \u0111\u1ebfn t\u1eebng giao di\u1ec7n. C\u1ea5u tr\u00fac n\u00e0y cho ph\u00e9p \u0111a h\u00ecnh tr\u00ean c\u00e1c kh\u1ea3 n\u0103ng kh\u00e1c nhau, v\u00ed d\u1ee5 nh\u01b0C\u00f3 th\u1ec3 tu\u1ea7n t\u1ef1 h\u00f3a<\/code> v\u00e0 C\u00f3 th\u1ec3 so s\u00e1nh<\/code>.<\/p>\n

                T\u00f3m t\u1eaft c\u00e1c kh\u00e1i ni\u1ec7m ch\u00ednh \ud83d\udd11<\/h2>\n

                Vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a hi\u1ec7u qu\u1ea3 k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh trong s\u01a1 \u0111\u1ed3 l\u1edbp UML \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u r\u00f5 v\u1ec1 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c k\u00fd hi\u1ec7u chu\u1ea9n v\u00e0 tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng n\u1ec1n t\u1ea3ng.<\/p>\n

                  \n
                • K\u1ebf th\u1eeba<\/strong>thi\u1ebft l\u1eadp m\u1ed9t th\u1ee9 t\u1ef1 ki\u1ec3u th\u00f4ng qua kh\u00e1i qu\u00e1t h\u00f3a.<\/li>\n
                • \u0110a h\u00ecnh<\/strong>cho ph\u00e9p c\u00e1c l\u1edbp con ghi \u0111\u00e8 h\u00e0nh vi trong khi duy tr\u00ec m\u1ed9t giao di\u1ec7n chung.<\/li>\n
                • K\u00fd hi\u1ec7u UML<\/strong> s\u1eed d\u1ee5ng c\u00e1c m\u0169i t\u00ean c\u1ee5 th\u1ec3 v\u00e0 c\u00e1c ki\u1ec3u d\u00e1ng \u0111\u1ec3 bi\u1ec3u th\u1ecb c\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng v\u00e0 giao di\u1ec7n.<\/li>\n
                • L\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf<\/strong>n\u00ean \u01b0u ti\u00ean k\u1ebft h\u1ee3p h\u01a1n l\u00e0 k\u1ebf th\u1eeba khi t\u00ednh linh ho\u1ea1t l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t.<\/li>\n<\/ul>\n

                  B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc n\u00e0y, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd, d\u1ec5 hi\u1ec3u, d\u1ec5 m\u1edf r\u1ed9ng v\u00e0 b\u1ea3o tr\u00ec h\u01a1n. S\u1ef1 r\u00f5 r\u00e0ng tr\u1ef1c quan \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi c\u00e1c s\u01a1 \u0111\u1ed3 UML \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac t\u1ed1t s\u1ebd gi\u00fap l\u1ea5p \u0111\u1ea7y kho\u1ea3ng c\u00e1ch gi\u1eefa thi\u1ebft k\u1ebf l\u00fd thuy\u1ebft v\u00e0 tri\u1ec3n khai th\u1ef1c t\u1ebf.<\/p>\n","protected":false},"excerpt":{"rendered":"

                  L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP) ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o c\u00e1c nguy\u00ean t\u1eafc k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 t\u1ea1o ra c\u00e1c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 m\u1edf…<\/p>\n","protected":false},"author":1,"featured_media":140,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Kh\u00e1m ph\u00e1 s\u00e2u: K\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh trong s\u01a1 \u0111\u1ed3 l\u1edbp UML \ud83e\udde9","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh trong s\u01a1 \u0111\u1ed3 l\u1edbp UML. 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