{"id":1038,"date":"2026-03-29T01:26:46","date_gmt":"2026-03-29T01:26:46","guid":{"rendered":"https:\/\/www.visualize-ai.com\/vn\/component-breakdown-core-elements-object-oriented-system\/"},"modified":"2026-03-29T01:26:46","modified_gmt":"2026-03-29T01:26:46","slug":"component-breakdown-core-elements-object-oriented-system","status":"publish","type":"post","link":"https:\/\/www.visualize-ai.com\/vn\/component-breakdown-core-elements-object-oriented-system\/","title":{"rendered":"Ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n: C\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i c\u1ee7a m\u1ecdi h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng"},"content":{"rendered":"

Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac cho vi\u1ec7c x\u00e2y d\u1ef1ng ph\u1ea7n m\u1ec1m. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u1eadp trung v\u00e0o vi\u1ec7c t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n xung quanh d\u1eef li\u1ec7u, hay c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, thay v\u00ec c\u00e1c h\u00e0m v\u00e0 logic. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng d\u1ec5 b\u1ea3o tr\u00ec, c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng v\u00e0 v\u1eefng ch\u1eafc. H\u01b0\u1edbng d\u1eabn n\u00e0y tr\u00ecnh b\u00e0y chi ti\u1ebft c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i c\u1ea5u th\u00e0nh m\u1ecdi ki\u1ebfn tr\u00fac h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

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

\ud83d\udd0d N\u1ec1n t\u1ea3ng: L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

\u1ede n\u1ec1n t\u1ea3ng c\u1ee7a m\u00f4 h\u00ecnh n\u00e0y t\u1ed3n t\u1ea1i hai kh\u00e1i ni\u1ec7m ri\u00eang bi\u1ec7t nh\u01b0ng c\u00f3 li\u00ean quan: l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng. Vi\u1ec7c nh\u1ea7m l\u1eabn gi\u1eefa hai kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 m\u1ed9t l\u1ed7i ph\u1ed5 bi\u1ebfn trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf ban \u0111\u1ea7u. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa \u0111\u1ecbnh ngh\u0129a v\u00e0 th\u1ec3 hi\u1ec7n (instance).<\/p>\n

    \n
  • L\u1edbp:<\/strong> M\u1ed9t b\u1ea3n thi\u1ebft k\u1ebf ho\u1eb7c m\u1eabu. N\u00f3 x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac v\u00e0 h\u00e0nh vi. N\u00f3 m\u00f4 t\u1ea3 nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0o t\u1ed3n t\u1ea1i v\u00e0 nh\u1eefng thao t\u00e1c n\u00e0o c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. N\u00f3 kh\u00f4ng chi\u1ebfm b\u1ed9 nh\u1edb theo c\u00e1ch m\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n (instance) l\u00e0m cho \u0111\u1ebfn khi n\u00f3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o.<\/li>\n
  • \u0110\u1ed1i t\u01b0\u1ee3ng:<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t l\u1edbp. Khi ch\u01b0\u01a1ng tr\u00ecnh ch\u1ea1y, n\u00f3 t\u1ea1o ra c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng d\u1ef1a tr\u00ean \u0111\u1ecbnh ngh\u0129a c\u1ee7a l\u1edbp. M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng gi\u1eef tr\u1ea1ng th\u00e1i ri\u00eang c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n

    H\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd kho h\u00e0ng k\u1ef9 thu\u1eadt s\u1ed1. L\u1edbpS\u1ea3n ph\u1ea9m<\/code> x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ea3n ph\u1ea9m tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0o: n\u00f3 c\u00f3 t\u00ean, gi\u00e1 v\u00e0 s\u1ed1 l\u01b0\u1ee3ng t\u1ed3n kho. Khi h\u1ec7 th\u1ed1ng t\u1ea3i d\u1eef li\u1ec7u, n\u00f3 t\u1ea1o ra c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ngS\u1ea3n ph\u1ea9m<\/code> ri\u00eang bi\u1ec7t. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t chi\u1ebfc laptop c\u1ee5 th\u1ec3, trong khi m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c \u0111\u1ea1i di\u1ec7n cho m\u1ed9t con chu\u1ed9t c\u1ee5 th\u1ec3. C\u1ea3 hai \u0111\u1ec1u chia s\u1ebb c\u00f9ng m\u1ed9t c\u1ea5u tr\u00fac nh\u01b0ng gi\u1eef c\u00e1c gi\u00e1 tr\u1ecb d\u1eef li\u1ec7u kh\u00e1c nhau.<\/p>\n

    C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a l\u1edbp<\/h3>\n
      \n
    • Tr\u1ea1ng th\u00e1i:<\/strong> D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong c\u00e1c bi\u1ebfn, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u01b0\u1eddng ho\u1eb7c thu\u1ed9c t\u00ednh.<\/li>\n
    • H\u00e0nh vi:<\/strong> Logic \u0111\u01b0\u1ee3c th\u1ef1c thi th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c h\u00e0m.<\/li>\n
    • Danh t\u00ednh:<\/strong> M\u1ed9t c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 ph\u00e2n bi\u1ec7t m\u1ed9t th\u1ec3 hi\u1ec7n n\u00e0y v\u1edbi th\u1ec3 hi\u1ec7n kh\u00e1c.<\/li>\n<\/ul>\n

      \ud83d\udee1\ufe0f \u0110\u00f3ng g\u00f3i: B\u1ea3o v\u1ec7 d\u1eef li\u1ec7u<\/h2>\n

      \u0110\u00f3ng g\u00f3i l\u00e0 c\u01a1 ch\u1ebf li\u00ean k\u1ebft d\u1eef li\u1ec7u v\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u1ea1i v\u1edbi nhau trong khi h\u1ea1n ch\u1ebf quy\u1ec1n truy c\u1eadp tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u00f3 l\u00e0 th\u1ef1c h\u00e0nh \u1ea9n tr\u1ea1ng th\u00e1i b\u00ean trong c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 y\u00eau c\u1ea7u m\u1ecdi t\u01b0\u01a1ng t\u00e1c ph\u1ea3i di\u1ec5n ra th\u00f4ng qua m\u1ed9t giao di\u1ec7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng.<\/p>\n

      T\u1ea1i sao \u0110\u00f3ng g\u00f3i l\u1ea1i quan tr\u1ecdng<\/h3>\n
        \n
      • T\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u:<\/strong> B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i, b\u1ea1n ng\u0103n ng\u1eeba c\u00e1c tr\u1ea1ng th\u00e1i kh\u00f4ng h\u1ee3p l\u1ec7. V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng kh\u00f4ng n\u00ean cho ph\u00e9p s\u1ed1 d\u01b0 tr\u1edf th\u00e0nh \u00e2m m\u1ed9t c\u00e1ch tr\u1ef1c ti\u1ebfp.<\/li>\n
      • Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a:<\/strong> Ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0m g\u00ec, ch\u1ee9 kh\u00f4ng c\u1ea7n bi\u1ebft n\u00f3 l\u00e0m nh\u01b0 th\u1ebf n\u00e0o.<\/li>\n
      • B\u1ea3o tr\u00ec:<\/strong> N\u1ebfu vi\u1ec7c tri\u1ec3n khai b\u00ean trong thay \u0111\u1ed5i, m\u00e3 ngu\u1ed3n b\u00ean ngo\u00e0i s\u1ebd kh\u00f4ng b\u1ecb l\u1ed7i mi\u1ec5n l\u00e0 giao di\u1ec7n v\u1eabn gi\u1eef nguy\u00ean.<\/li>\n<\/ul>\n

        Trong th\u1ef1c t\u1ebf, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00f4ng qua c\u00e1c b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh truy c\u1eadp. C\u00e1c t\u1eeb kh\u00f3a n\u00e0y quy \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 hi\u1ec3n th\u1ecb c\u1ee7a c\u00e1c th\u00e0nh vi\u00ean l\u1edbp. C\u00e1c m\u1ee9c \u0111\u1ed9 hi\u1ec3n th\u1ecb ph\u1ed5 bi\u1ebfn bao g\u1ed3m public (c\u00f4ng khai), private (ri\u00eang t\u01b0) v\u00e0 protected (b\u1ea3o v\u1ec7). C\u00e1c th\u00e0nh vi\u00ean private ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c b\u00ean trong ch\u00ednh l\u1edbp \u0111\u00f3. C\u00e1c th\u00e0nh vi\u00ean public c\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u. C\u00e1c th\u00e0nh vi\u00ean protected c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c b\u00ean trong l\u1edbp v\u00e0 b\u1edfi c\u00e1c l\u1edbp con.<\/p>\n

        \ud83c\udf33 Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a: \u0110\u01a1n gi\u1ea3n h\u00f3a s\u1ef1 ph\u1ee9c t\u1ea1p<\/h2>\n

        Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a t\u1eadp trung v\u00e0o vi\u1ec7c \u1ea9n c\u00e1c chi ti\u1ebft tri\u1ec3n khai ph\u1ee9c t\u1ea1p v\u00e0 ch\u1ec9 ph\u01a1i b\u00e0y c\u00e1c t\u00ednh n\u0103ng c\u1ea7n thi\u1ebft. N\u00f3 cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m c\u1ea5p cao m\u00e0 kh\u00f4ng b\u1ecb sa l\u1ea7y v\u00e0o c\u00e1c chi ti\u1ebft c\u1ea5p th\u1ea5p. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c trong giai \u0111o\u1ea1n ph\u00e2n t\u00edch.<\/p>\n

        C\u00e1c lo\u1ea1i tr\u1eebu t\u01b0\u1ee3ng h\u00f3a<\/h3>\n
          \n
        • L\u1edbp tr\u1eebu t\u01b0\u1ee3ng:<\/strong>Ch\u00fang kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o \u0111\u1ed9c l\u1eadp. Ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng b\u1edfi c\u00e1c l\u1edbp kh\u00e1c. Ch\u00fang c\u00f3 th\u1ec3 ch\u1ee9a c\u1ea3 ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng (kh\u00f4ng c\u00f3 tri\u1ec3n khai) v\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u1ee5 th\u1ec3 (c\u00f3 tri\u1ec3n khai).<\/li>\n
        • Giao di\u1ec7n:<\/strong>M\u1ed9t h\u1ee3p \u0111\u1ed3ng quy \u0111\u1ecbnh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 m\u1ed9t l\u1edbp ph\u1ea3i tri\u1ec3n khai. N\u00f3 kh\u00f4ng \u0111\u1ecbnh ngh\u0129a c\u00e1ch c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1ea1t \u0111\u1ed9ng, ch\u1ec9 l\u00e0 ch\u00fang t\u1ed3n t\u1ea1i.<\/li>\n<\/ul>\n

          Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a h\u1ed7 tr\u1ee3 vi\u1ec7c t\u00e1ch bi\u1ec7t c\u00e1c m\u1ed1i quan t\u00e2m. M\u1ed9t ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u1ed9t PaymentProcessor<\/code> kh\u00f4ng c\u1ea7n bi\u1ebft thu\u1eadt to\u00e1n m\u00e3 h\u00f3a c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. H\u1ecd ch\u1ec9 c\u1ea7n g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c processPayment<\/code>. S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y khi\u1ebfn h\u1ec7 th\u1ed1ng d\u1ec5 suy lu\u1eadn h\u01a1n.<\/p>\n

          \ud83d\udd04 K\u1ebf th\u1eeba: T\u00e1i s\u1eed d\u1ee5ng m\u00e3<\/h2>\n

          K\u1ebf th\u1eeba cho ph\u00e9p m\u1ed9t l\u1edbp m\u1edbi k\u1ebf th\u1eeba c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a m\u1ed9t l\u1edbp \u0111\u00e3 t\u1ed3n t\u1ea1i. L\u1edbp \u0111\u00e3 t\u1ed3n t\u1ea1i l\u00e0 l\u1edbp cha ho\u1eb7c si\u00eau l\u1edbp. L\u1edbp m\u1edbi l\u00e0 l\u1edbp con ho\u1eb7c l\u1edbp con. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng m\u00e3 v\u00e0 thi\u1ebft l\u1eadp m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p logic.<\/p>\n

          L\u1ee3i \u00edch c\u1ee7a k\u1ebf th\u1eeba<\/h3>\n
            \n
          • Gi\u1ea3m s\u1ef1 tr\u00f9ng l\u1eb7p:<\/strong>Logic chung ch\u1ec9 \u0111\u01b0\u1ee3c vi\u1ebft m\u1ed9t l\u1ea7n trong l\u1edbp cha.<\/li>\n
          • Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>C\u00e1c lo\u1ea1i 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 hi\u1ec7n c\u00f3.<\/li>\n
          • \u0110a h\u00ecnh:<\/strong>K\u1ebf th\u1eeba cho ph\u00e9p h\u00e0nh vi \u0111a h\u00ecnh, cho ph\u00e9p c\u00e1c l\u1edbp kh\u00e1c nhau \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp cha.<\/li>\n<\/ul>\n

            Tuy nhi\u00ean, k\u1ebf th\u1eeba ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn. C\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p s\u00e2u c\u00f3 th\u1ec3 tr\u1edf n\u00ean kh\u00f3 duy tr\u00ec. S\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd gi\u1eefa l\u1edbp cha v\u00e0 l\u1edbp con c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 khi c\u1ea7n thay \u0111\u1ed5i trong l\u1edbp c\u01a1 s\u1edf. T\u1ed5 h\u1ee3p th\u01b0\u1eddng l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn thay th\u1ebf \u0111\u01b0\u1ee3c \u01b0a th\u00edch cho c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p.<\/p>\n

            \ud83c\udfad \u0110a h\u00ecnh: S\u1ef1 linh ho\u1ea1t trong h\u00e0nh \u0111\u1ed9ng<\/h2>\n

            \u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a c\u00e1c l\u1edbp kh\u00e1c nhau ph\u1ea3n h\u1ed3i c\u00f9ng m\u1ed9t l\u1eddi g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c theo nh\u1eefng c\u00e1ch kh\u00e1c nhau. N\u00f3 cho ph\u00e9p m\u1ed9t giao di\u1ec7n duy nh\u1ea5t \u0111\u1ea1i di\u1ec7n cho c\u00e1c h\u00ecnh th\u1ee9c n\u1ec1n t\u1ea3ng kh\u00e1c nhau. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng linh ho\u1ea1t v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng.<\/p>\n

            C\u00e1c h\u00ecnh th\u1ee9c c\u1ee7a \u0111a h\u00ecnh<\/h3>\n
              \n
            • Th\u1eddi gian bi\u00ean d\u1ecbch (T\u0129nh):<\/strong>\u0110\u1ea1t \u0111\u01b0\u1ee3c th\u00f4ng qua vi\u1ec7c qu\u00e1 t\u1ea3i ph\u01b0\u01a1ng th\u1ee9c. Nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c trong c\u00f9ng m\u1ed9t l\u1edbp c\u00f3 c\u00f9ng t\u00ean nh\u01b0ng c\u00f3 danh s\u00e1ch tham s\u1ed1 kh\u00e1c nhau.<\/li>\n
            • Th\u1eddi gian ch\u1ea1y (\u0110\u1ed9ng):<\/strong>\u0110\u1ea1t \u0111\u01b0\u1ee3c th\u00f4ng qua vi\u1ec7c ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c. M\u1ed9t 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 l\u1edbp cha c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n

              H\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng hi\u1ec3n th\u1ecb \u0111\u1ed3 h\u1ecda. B\u1ea1n c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t H\u00ecnh<\/code> l\u1edbp v\u1edbi m\u1ed9t v\u1ebd<\/code> ph\u01b0\u01a1ng th\u1ee9c. H\u00ecnh tr\u00f2n<\/code> v\u00e0 H\u00ecnh vu\u00f4ng<\/code> l\u1edbp th\u1eeba k\u1ebf t\u1eeb H\u00ecnh<\/code>. Khi \u0111\u1ed9ng c\u01a1 \u0111\u1ed3 h\u1ecda g\u1ecdi v\u1ebd<\/code> tr\u00ean m\u1ed9t danh s\u00e1ch c\u00e1c h\u00ecnh, n\u00f3 kh\u00f4ng c\u1ea7n bi\u1ebft lo\u1ea1i c\u1ee5 th\u1ec3. M\u1ed7i h\u00ecnh bi\u1ebft c\u00e1ch t\u1ef1 v\u1ebd. \u0110i\u1ec1u n\u00e0y t\u00e1ch r\u1eddi b\u1ed9 v\u1ebd kh\u1ecfi c\u00e1c lo\u1ea1i h\u00ecnh h\u1ecdc c\u1ee5 th\u1ec3.<\/p>\n

              \ud83d\udd17 M\u1ed1i quan h\u1ec7 v\u00e0 Li\u00ean k\u1ebft<\/h2>\n

              C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i bi\u1ec7t l\u1eadp. Ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a giai \u0111o\u1ea1n thi\u1ebft k\u1ebf. C\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean h\u1ec7 v\u1edbi nhau \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 gh\u00e9p n\u1ed1i v\u00e0 \u0111\u1ed9 g\u1eafn k\u1ebft.<\/p>\n

              C\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn<\/h3>\n
                \n
              • Li\u00ean k\u1ebft:<\/strong> M\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac trong \u0111\u00f3 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. N\u00f3 th\u01b0\u1eddng l\u00e0 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-nhi\u1ec1u.<\/li>\n
              • Tuy\u1ec3n t\u1eadp:<\/strong> M\u1ed9t lo\u1ea1i li\u00ean k\u1ebft c\u1ee5 th\u1ec3 trong \u0111\u00f3 to\u00e0n th\u1ec3 v\u00e0 c\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. V\u00ed d\u1ee5, m\u1ed9t Ph\u00f2ng ban<\/code> c\u00f3 nh\u00e2n vi\u00ean<\/code>. N\u1ebfu Ph\u00f2ng ban b\u1ecb x\u00f3a, c\u00e1c Nh\u00e2n vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i.<\/li>\n
              • T\u1ed5 h\u1ee3p:<\/strong> M\u1ed9t d\u1ea1ng tuy\u1ec3n t\u1eadp m\u1ea1nh h\u01a1n. C\u00e1c ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. N\u1ebfu ng\u00f4i nh\u00e0<\/code> b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c ph\u00f2ng<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i.<\/li>\n
              • Ph\u1ee5 thu\u1ed9c:<\/strong>M\u1ed1i quan h\u1ec7 trong \u0111\u00f3 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee5 thu\u1ed9c v\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t nhi\u1ec7m v\u1ee5. N\u00f3 th\u01b0\u1eddng mang t\u00ednh t\u1ea1m th\u1eddi.<\/li>\n<\/ul>\n

                B\u1ea3ng so s\u00e1nh: Aggregation so v\u1edbi Composition<\/h3>\n\n\n\n\n\n\n\n\n
                \u0110\u1eb7c \u0111i\u1ec3m<\/th>\nAggregation<\/th>\nComposition<\/th>\n<\/tr>\n<\/thead>\n
                Quy\u1ec1n s\u1edf h\u1eefu<\/strong><\/td>\nQuy\u1ec1n s\u1edf h\u1eefu y\u1ebfu<\/td>\nQuy\u1ec1n s\u1edf h\u1eefu m\u1ea1nh<\/td>\n<\/tr>\n
                V\u00f2ng \u0111\u1eddi<\/strong><\/td>\nCon t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp<\/td>\nCon ch\u1ebft c\u00f9ng cha<\/td>\n<\/tr>\n
                V\u00ed d\u1ee5<\/strong><\/td>\nTh\u01b0 vi\u1ec7n v\u00e0 S\u00e1ch<\/td>\nNh\u00e0 v\u00e0 C\u00e1c ph\u00f2ng<\/td>\n<\/tr>\n
                Tri\u1ec3n khai<\/strong><\/td>\nTham chi\u1ebfu \u0111\u01b0\u1ee3c truy\u1ec1n qua h\u00e0m t\u1ea1o ho\u1eb7c setter<\/td>\n\u0110\u01b0\u1ee3c t\u1ea1o ra b\u00ean trong cha<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                \u2699\ufe0f C\u01a1 ch\u1ebf h\u00e0nh vi: Ph\u01b0\u01a1ng th\u1ee9c v\u00e0 Th\u00f4ng \u0111i\u1ec7p<\/h2>\n

                S\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng di\u1ec5n ra th\u00f4ng qua c\u00e1c th\u00f4ng \u0111i\u1ec7p. Trong ng\u1eef c\u1ea3nh n\u00e0y, m\u1ed9t th\u00f4ng \u0111i\u1ec7p l\u00e0 y\u00eau c\u1ea7u m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng. H\u00e0nh \u0111\u1ed9ng n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1edfi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

                V\u00f2ng \u0111\u1eddi c\u1ee7a Ph\u01b0\u01a1ng th\u1ee9c<\/h3>\n
                  \n
                • G\u1ecdi:<\/strong>Client g\u1eedi m\u1ed9t th\u00f4ng \u0111i\u1ec7p \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng server.<\/li>\n
                • Th\u1ef1c thi:<\/strong>\u0110\u1ed1i t\u01b0\u1ee3ng server th\u1ef1c thi m\u00e3 c\u1ee7a ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n
                • Tr\u1ea3 v\u1ec1:<\/strong>Ph\u01b0\u01a1ng th\u1ee9c tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 ho\u1eb7c gi\u00e1 tr\u1ecb cho client.<\/li>\n<\/ul>\n

                  Thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 m\u1ed9t tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t. M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c n\u00ean l\u00e0m t\u1ed1t m\u1ed9t vi\u1ec7c. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c th\u1ef1c hi\u1ec7n qu\u00e1 nhi\u1ec1u nhi\u1ec7m v\u1ee5, n\u00f3 s\u1ebd tr\u1edf n\u00ean kh\u00f3 ki\u1ec3m th\u1eed v\u00e0 b\u1ea3o tr\u00ec. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi Nguy\u00ean t\u1eafc Tr\u00e1ch nhi\u1ec7m \u0110\u01a1n l\u1ebb, nguy\u00ean t\u1eafc n\u00e0y g\u1ee3i \u00fd r\u1eb1ng m\u1ed9t l\u1edbp ch\u1ec9 n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i.<\/p>\n

                  \ud83e\udde9 C\u00e1c kh\u00e1i ni\u1ec7m c\u1ea5u tr\u00fac n\u00e2ng cao<\/h2>\n

                  Ngo\u00e0i nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n, c\u00f3 nhi\u1ec1u kh\u00e1i ni\u1ec7m n\u00e2ng cao gi\u00fap tinh ch\u1ec9nh c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. C\u00e1c c\u00f4ng c\u1ee5 n\u00e0y gi\u00fap qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p trong c\u00e1c \u1ee9ng d\u1ee5ng quy m\u00f4 l\u1edbn.<\/p>\n

                  Giao di\u1ec7n v\u00e0 H\u1ee3p \u0111\u1ed3ng<\/h3>\n

                  C\u00e1c giao di\u1ec7n x\u00e1c \u0111\u1ecbnh m\u1ed9t h\u1ee3p \u0111\u1ed3ng. Ch\u00fang quy \u0111\u1ecbnh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 c\u00e1c l\u1edbp tri\u1ec3n khai ph\u1ea3i cung c\u1ea5p. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c l\u1edbp kh\u00e1c nhau \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay th\u1ebf cho nhau n\u1ebfu ch\u00fang tu\u00e2n th\u1ee7 c\u00f9ng m\u1ed9t giao di\u1ec7n. N\u00f3 th\u00fac \u0111\u1ea9y s\u1ef1 gh\u00e9p n\u1ed1i l\u1ecfng l\u1ebbo. M\u00e3 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t giao di\u1ec7n s\u1ebd \u00edt ph\u1ee5 thu\u1ed9c h\u01a1n v\u00e0o c\u00e1c tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n

                  C\u00e1c nh\u00e0 m\u00e1y tr\u1eebu t\u01b0\u1ee3ng v\u00e0 c\u00e1c m\u1eabu s\u00e1ng t\u1ea1o<\/h3>\n

                  Vi\u1ec7c t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p. C\u00e1c m\u1eabu s\u00e1ng t\u1ea1o cung c\u1ea5p m\u1ed9t c\u00e1ch \u0111\u1ec3 qu\u1ea3n l\u00fd vi\u1ec7c t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng. Thay v\u00ec s\u1eed d\u1ee5ngnew<\/code> tr\u1ef1c ti\u1ebfp \u1edf m\u1ecdi n\u01a1i, m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c nh\u00e0 m\u00e1y ho\u1eb7c nh\u00e0 m\u00e1y tr\u1eebu t\u01b0\u1ee3ng s\u1ebd x\u1eed l\u00fd vi\u1ec7c kh\u1edfi t\u1ea1o. \u0110i\u1ec1u n\u00e0y t\u1eadp trung h\u00f3a logic t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 gi\u00fap d\u1ec5 d\u00e0ng thay th\u1ebf c\u00e1c tri\u1ec3n khai m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3 c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n

                  C\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf trong th\u1ef1c t\u1ebf<\/h3>\n

                  Nhi\u1ec1u nguy\u00ean t\u1eafc h\u01b0\u1edbng d\u1eabn vi\u1ec7c s\u1eafp x\u1ebfp c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y. Vi\u1ec7c \u00e1p d\u1ee5ng ch\u00fang \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng v\u1eabn \u1ed5n \u0111\u1ecbnh theo th\u1eddi gian.<\/p>\n

                    \n
                  • \u0110\u1ed9 g\u1eafn k\u1ebft cao:<\/strong>C\u00e1c ph\u1ea7n t\u1eed b\u00ean trong m\u1ed9t l\u1edbp n\u00ean c\u00f3 m\u1ed1i li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd. Ch\u00fang n\u00ean ph\u1ed1i h\u1ee3p v\u1edbi nhau \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t m\u1ee5c \u0111\u00edch duy nh\u1ea5t.<\/li>\n
                  • \u0110\u1ed9 gh\u00e9p n\u1ed1i th\u1ea5p:<\/strong>C\u00e1c ph\u1ee5 thu\u1ed9c gi\u1eefa c\u00e1c l\u1edbp n\u00ean \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u. Nh\u1eefng thay \u0111\u1ed5i trong m\u1ed9t l\u1edbp kh\u00f4ng n\u00ean lan truy\u1ec1n qua to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/li>\n
                  • Nguy\u00ean t\u1eafc M\u1edf\/R\u1ed9ng:<\/strong>C\u00e1c l\u1edbp n\u00ean m\u1edf \u0111\u1ec3 m\u1edf r\u1ed9ng nh\u01b0ng \u0111\u00f3ng \u0111\u1ec3 s\u1eeda \u0111\u1ed5i. B\u1ea1n th\u00eam h\u00e0nh vi m\u1edbi b\u1eb1ng c\u00e1ch th\u00eam c\u00e1c l\u1edbp m\u1edbi, ch\u1ee9 kh\u00f4ng ph\u1ea3i b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i m\u00e3 hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

                    \ud83d\udcca Qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i v\u00e0 danh t\u00ednh<\/h2>\n

                    Qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i l\u00e0 m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i theo th\u1eddi gian \u0111\u1ec3 ph\u1ea3n h\u1ed3i c\u00e1c th\u00f4ng \u0111i\u1ec7p. Vi\u1ec7c theo d\u00f5i tr\u1ea1ng th\u00e1i n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng cho vi\u1ec7c g\u1ee1 l\u1ed7i v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n.<\/p>\n

                    T\u00ednh nh\u1ea5t qu\u00e1n c\u1ee7a tr\u1ea1ng th\u00e1i<\/h3>\n
                      \n
                    • T\u00ednh b\u1ea5t bi\u1ebfn:<\/strong>M\u1ed9t s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 kh\u00f4ng thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i sau khi t\u1ea1o. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c suy lu\u1eadn v\u1ec1 m\u00e3. N\u00f3 \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch trong c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111\u1ed3ng th\u1eddi.<\/li>\n
                    • \u0110\u00f3ng g\u00f3i tr\u1ea1ng th\u00e1i:<\/strong>C\u00e1c bi\u1ebfn tr\u1ea1ng th\u00e1i n\u00ean l\u00e0 ri\u00eang t\u01b0. C\u00e1c b\u1ed9 truy c\u1eadp (getter) n\u00ean \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111\u1ecdc tr\u1ea1ng th\u00e1i, v\u00e0 c\u00e1c b\u1ed9 thay \u0111\u1ed5i (setter) n\u00ean \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 thay \u0111\u1ed5i n\u00f3. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00e1c b\u1ea5t bi\u1ebfn \u0111\u01b0\u1ee3c duy tr\u00ec.<\/li>\n<\/ul>\n

                      Danh t\u00ednh so v\u1edbi S\u1ef1 b\u1eb1ng nhau<\/h3>\n

                      Hi\u1ec3u s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa danh t\u00ednh v\u00e0 s\u1ef1 b\u1eb1ng nhau l\u00e0 r\u1ea5t quan tr\u1ecdng. Danh t\u00ednh \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c hai tham chi\u1ebfu c\u00f3 tr\u1ecf \u0111\u1ebfn c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh x\u00e1c trong b\u1ed9 nh\u1edb hay kh\u00f4ng. S\u1ef1 b\u1eb1ng nhau \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c hai \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 c\u00f9ng n\u1ed9i dung ho\u1eb7c gi\u00e1 tr\u1ecb hay kh\u00f4ng. C\u00e1c h\u1ec7 th\u1ed1ng th\u01b0\u1eddng c\u1ea7n ki\u1ec3m tra s\u1ef1 b\u1eb1ng nhau d\u1ef1a tr\u00ean d\u1eef li\u1ec7u, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u1ecba ch\u1ec9 b\u1ed9 nh\u1edb.<\/p>\n

                      \ud83d\ude80 Thi\u1ebft k\u1ebf cho s\u1ef1 thay \u0111\u1ed5i<\/h2>\n

                      Y\u00eau c\u1ea7u thay \u0111\u1ed5i. H\u1ec7 th\u1ed1ng ph\u1ea3i th\u00edch nghi. C\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn \u1edf \u0111\u00e2y cung c\u1ea5p s\u1ef1 linh ho\u1ea1t c\u1ea7n thi\u1ebft cho s\u1ef1 thay \u0111\u1ed5i. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng tr\u1eebu t\u01b0\u1ee3ng h\u00f3a v\u00e0 giao di\u1ec7n, b\u1ea1n c\u00f4 l\u1eadp c\u00e1c ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng thay \u0111\u1ed5i. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u0111\u00f3ng g\u00f3i, b\u1ea1n b\u1ea3o v\u1ec7 logic n\u1ed9i b\u1ed9 kh\u1ecfi s\u1ef1 can thi\u1ec7p b\u00ean ngo\u00e0i.<\/p>\n

                      Khi ph\u00e2n t\u00edch m\u1ed9t h\u1ec7 th\u1ed1ng, h\u00e3y b\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c danh t\u1eeb (l\u1edbp) v\u00e0 \u0111\u1ed9ng t\u1eeb (ph\u01b0\u01a1ng th\u1ee9c). Sau \u0111\u00f3, x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. \u0110\u1ea3m b\u1ea3o r\u1eb1ng th\u1ee9 b\u1eadc l\u00e0 h\u1ee3p l\u00fd v\u00e0 kh\u00f4ng qu\u00e1 s\u00e2u. \u01afu ti\u00ean t\u1ed5 h\u1ee3p thay v\u00ec th\u1eeba k\u1ebf khi m\u1ed1i quan h\u1ec7 kh\u00f4ng ph\u1ea3i l\u00e0is-a<\/code> m\u1ed1i quan h\u1ec7.<\/p>\n

                      C\u00e1c l\u1ed7i ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h3>\n
                        \n
                      • \u0110\u1ed1i t\u01b0\u1ee3ng Th\u01b0\u1ee3ng \u0111\u1ebf:<\/strong>C\u00e1c l\u1edbp bi\u1ebft qu\u00e1 nhi\u1ec1u ho\u1eb7c l\u00e0m qu\u00e1 nhi\u1ec1u. H\u00e3y chia nh\u1ecf ch\u00fang th\u00e0nh c\u00e1c l\u1edbp nh\u1ecf h\u01a1n, t\u1eadp trung h\u01a1n.<\/li>\n
                      • C\u00e2y th\u1eeba k\u1ebf s\u00e2u:<\/strong>\u0110i\u1ec1u n\u00e0y khi\u1ebfn vi\u1ec7c x\u00e1c \u0111\u1ecbnh n\u01a1i \u0111\u1ecbnh ngh\u0129a m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c tr\u1edf n\u00ean kh\u00f3 kh\u0103n. H\u00e3y l\u00e0m ph\u1eb3ng c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p khi c\u00f3 th\u1ec3.<\/li>\n
                      • R\u00f2 r\u1ec9 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a:<\/strong>Bu\u1ed9c ng\u01b0\u1eddi g\u1ecdi ph\u1ea3i hi\u1ec3u c\u00e1c chi ti\u1ebft tri\u1ec3n khai. H\u00e3y gi\u1eef cho giao di\u1ec7n lu\u00f4n s\u1ea1ch s\u1ebd.<\/li>\n<\/ul>\n

                        \ud83d\udcdd T\u00f3m t\u1eaft c\u00e1c y\u1ebfu t\u1ed1 c\u1ea5u tr\u00fac<\/h2>\n

                        T\u00f3m l\u1ea1i, m\u1ed9t h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng v\u1eefng ch\u1eafc d\u1ef1a tr\u00ean s\u1ef1 c\u00e2n b\u1eb1ng c\u1ea9n tr\u1ecdng gi\u1eefa c\u1ea5u tr\u00fac v\u00e0 h\u00e0nh vi. Danh s\u00e1ch d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft c\u00e1c th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu.<\/p>\n

                          \n
                        • L\u1edbp:<\/strong>\u0110\u1ecbnh ngh\u0129a c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u.<\/li>\n
                        • \u0110\u1ed1i t\u01b0\u1ee3ng:<\/strong>C\u00e1c th\u1ec3 hi\u1ec7n th\u1eddi gian ch\u1ea1y c\u1ee7a c\u00e1c ki\u1ec3u.<\/li>\n
                        • Thu\u1ed9c t\u00ednh:<\/strong>D\u1eef li\u1ec7u tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c \u0111\u1ed1i t\u01b0\u1ee3ng l\u01b0u tr\u1eef.<\/li>\n
                        • Ph\u01b0\u01a1ng th\u1ee9c:<\/strong>Logic h\u00e0nh vi \u0111\u01b0\u1ee3c \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c thi.<\/li>\n
                        • Giao di\u1ec7n:<\/strong>C\u00e1c h\u1ee3p \u0111\u1ed3ng \u0111\u1ecbnh ngh\u0129a h\u00e0nh vi.<\/li>\n
                        • M\u1ed1i quan h\u1ec7:<\/strong>C\u00e1c li\u00ean k\u1ebft k\u1ebft n\u1ed1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u1edbi nhau.<\/li>\n
                        • \u0110\u00f3ng g\u00f3i:<\/strong>S\u1ef1 b\u1ea3o v\u1ec7 tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9.<\/li>\n
                        • Th\u1eeba k\u1ebf:<\/strong>C\u01a1 ch\u1ebf \u0111\u1ec3 t\u00e1i s\u1eed d\u1ee5ng m\u00e3.<\/li>\n
                        • \u0110a h\u00ecnh:<\/strong>Kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed9t c\u00e1ch th\u1ed1ng nh\u1ea5t.<\/li>\n<\/ul>\n

                          N\u1eafm v\u1eefng c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y cho ph\u00e9p c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i tr\u01b0\u1edbc s\u1ef1 thay \u0111\u1ed5i. Tr\u1ecdng t\u00e2m c\u1ea7n duy tr\u00ec \u1edf s\u1ef1 r\u00f5 r\u00e0ng, kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00e0 t\u00ednh \u0111\u00fang \u0111\u1eafn. Khi c\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nh\u1ea5t qu\u00e1n, ki\u1ebfn tr\u00fac k\u1ebft qu\u1ea3 s\u1ebd \u0111\u1ee9ng v\u1eefng tr\u01b0\u1edbc th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

                          Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac cho vi\u1ec7c x\u00e2y d\u1ef1ng ph\u1ea7n m\u1ec1m. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u1eadp trung v\u00e0o…<\/p>\n","protected":false},"author":1,"featured_media":1039,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Gi\u1ea3i th\u00edch c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i c\u1ee7a h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 ki\u1ebfn tr\u00fac OOP. H\u1ecdc v\u1ec1 l\u1edbp, th\u1eeba k\u1ebf v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc. H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu cho ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[44],"tags":[40,43],"class_list":["post-1038","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":"\nGi\u1ea3i th\u00edch c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i c\u1ee7a h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 ki\u1ebfn tr\u00fac OOP. H\u1ecdc v\u1ec1 l\u1edbp, th\u1eeba k\u1ebf v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc. H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu cho ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.visualize-ai.com\/vn\/component-breakdown-core-elements-object-oriented-system\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gi\u1ea3i th\u00edch c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i c\u1ee7a h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1\" \/>\n<meta property=\"og:description\" content=\"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 ki\u1ebfn tr\u00fac OOP. H\u1ecdc v\u1ec1 l\u1edbp, th\u1eeba k\u1ebf v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc. 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