{"id":1930,"date":"2026-03-22T22:47:31","date_gmt":"2026-03-22T22:47:31","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/composition-relationships-class-structures-ooad\/"},"modified":"2026-03-22T22:47:31","modified_gmt":"2026-03-22T22:47:31","slug":"composition-relationships-class-structures-ooad","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/composition-relationships-class-structures-ooad\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: C\u00e1c m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p trong c\u1ea5u tr\u00fac l\u1edbp"},"content":{"rendered":"
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\"Child-style<\/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), vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c l\u00e0 quan tr\u1ecdng kh\u00f4ng k\u00e9m g\u00ec vi\u1ec7c x\u00e1c \u0111\u1ecbnh ch\u00ednh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Trong s\u1ed1 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac kh\u00e1c nhau, k\u1ebft h\u1ee3p n\u1ed5i b\u1eadt nh\u01b0 m\u1ed9t c\u01a1 ch\u1ebf bu\u1ed9c ph\u1ea3i c\u00f3 quy\u1ec1n s\u1edf h\u1eefu ch\u1eb7t ch\u1ebd v\u00e0 ph\u1ee5 thu\u1ed9c v\u1ec1 v\u00f2ng \u0111\u1eddi. Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p, vi\u1ec7c l\u1ef1a ch\u1ecdn s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p thay v\u00ec li\u00ean k\u1ebft \u0111\u01a1n gi\u1ea3n hay t\u00edch h\u1ee3p s\u1ebd thay \u0111\u1ed5i c\u0103n b\u1ea3n c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i v\u00e0 c\u00e1ch b\u1ed9 nh\u1edb \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c c\u01a1 ch\u1ebf c\u1ee7a m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p trong c\u1ea5u tr\u00fac l\u1edbp. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1c n\u1ec1n t\u1ea3ng l\u00fd thuy\u1ebft, c\u00e1c m\u1eabu tri\u1ec3n khai th\u1ef1c t\u1ebf v\u00e0 h\u1ec7 qu\u1ea3 \u0111\u1ed1i v\u1edbi ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng. Tr\u1ecdng t\u00e2m v\u1eabn l\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n logic, tr\u00e1nh s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft trong khi \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf v\u1eefng ch\u1eafc.<\/p>\n

\ud83e\udde9 \u0110\u1ecbnh ngh\u0129a k\u1ebft h\u1ee3p trong OOAD<\/h2>\n

K\u1ebft h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u1eb7c bi\u1ec7t c\u1ee7a li\u00ean k\u1ebft, \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 ‘thu\u1ed9c v\u1ec1’. Kh\u00e1c v\u1edbi m\u1ed9t li\u00ean k\u1ebft chung gi\u1eefa hai th\u1ef1c th\u1ec3 \u0111\u1ed9c l\u1eadp, k\u1ebft h\u1ee3p ng\u1ee5 \u00fd r\u1eb1ng ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3. S\u1ef1 ph\u1ee5 thu\u1ed9c n\u00e0y l\u00e0 c\u1ea5u tr\u00fac, ch\u1ee9 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 logic.<\/p>\n

    \n
  • Quy\u1ec1n s\u1edf h\u1eefu:<\/strong> \u0110\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p s\u1edf h\u1eefu v\u00f2ng \u0111\u1eddi c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3.<\/li>\n
  • S\u1ef1 t\u1ed3n t\u1ea1i:<\/strong> N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c ph\u1ea7n c\u0169ng s\u1ebd b\u1ecb ph\u00e1 h\u1ee7y theo.<\/li>\n
  • T\u00ednh hi\u1ec3n th\u1ecb:<\/strong> C\u00e1c ph\u1ea7n th\u01b0\u1eddng kh\u00f4ng hi\u1ec3n th\u1ecb b\u00ean ngo\u00e0i ph\u1ea1m vi c\u1ee7a to\u00e0n th\u1ec3.<\/li>\n<\/ul>\n

    H\u00e3y xem x\u00e9t m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p \u0111\u01a1n gi\u1ea3n. L\u1edbp Nh\u00e0<\/code> c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng Ph\u00f2ng<\/code> N\u1ebfu Nh\u00e0<\/code> b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng Ph\u00f2ng<\/code> s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i trong b\u1ed1i c\u1ea3nh \u0111\u00f3. Ch\u00fang kh\u00f4ng t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n sang m\u1ed9t ng\u00f4i nh\u00e0 kh\u00e1c. \u0110\u00e2y ch\u00ednh l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a k\u1ebft h\u1ee3p.<\/p>\n

    \ud83d\udcca K\u1ebft h\u1ee3p so v\u1edbi T\u00edch h\u1ee3p<\/h2>\n

    S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra gi\u1eefa k\u1ebft h\u1ee3p v\u00e0 t\u00edch h\u1ee3p. C\u1ea3 hai \u0111\u1ec1u l\u00e0 d\u1ea1ng li\u00ean k\u1ebft, nh\u01b0ng ch\u00fang kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t v\u1ec1 qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi v\u00e0 m\u1ee9c \u0111\u1ed9 g\u1eafn k\u1ebft. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c.<\/p>\n\n\n\n\n\n\n\n\n\n
    T\u00ednh n\u0103ng<\/th>\nK\u1ebft h\u1ee3p<\/th>\nT\u00edch h\u1ee3p<\/th>\n<\/tr>\n<\/thead>\n
    Quy\u1ec1n s\u1edf h\u1eefu<\/strong><\/td>\nQuy\u1ec1n s\u1edf h\u1eefu m\u1ea1nh<\/td>\nQuy\u1ec1n s\u1edf h\u1eefu y\u1ebfu<\/td>\n<\/tr>\n
    V\u00f2ng \u0111\u1eddi<\/strong><\/td>\nPh\u1ee5 thu\u1ed9c<\/td>\n\u0110\u1ed9c l\u1eadp<\/td>\n<\/tr>\n
    S\u1ef1 t\u1ea1o th\u00e0nh<\/strong><\/td>\n\u0110\u01b0\u1ee3c t\u1ea1o ra b\u1edfi to\u00e0n b\u1ed9<\/td>\n\u0110\u01b0\u1ee3c t\u1ea1o ra t\u1eeb b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n
    S\u1ef1 ph\u00e1 h\u1ee7y<\/strong><\/td>\nB\u1ecb x\u00f3a c\u00f9ng to\u00e0n b\u1ed9<\/td>\nC\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n to\u00e0n b\u1ed9<\/td>\n<\/tr>\n
    V\u00ed d\u1ee5<\/strong><\/td>\nTim v\u00e0 C\u01a1 th\u1ec3<\/td>\nSinh vi\u00ean v\u00e0 m\u1ed9t tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Trong s\u1ef1 k\u1ebft h\u1ee3p, m\u1ed9t Tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc<\/code> qu\u1ea3n l\u00fd m\u1ed9t danh s\u00e1ch c\u00e1c Sinh vi\u00ean<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. N\u1ebfu tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc \u0111\u00f3ng c\u1eeda, c\u00e1c sinh vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i; h\u1ecd ch\u1ec9 \u0111\u01a1n gi\u1ea3n chuy\u1ec3n \u0111\u1ebfn m\u1ed9t t\u1ed5 ch\u1ee9c kh\u00e1c. Trong s\u1ef1 k\u1ebft h\u1ee3p, m\u1ed9t C\u01a1 th\u1ec3<\/code> qu\u1ea3n l\u00fd m\u1ed9t Tim<\/code>. N\u1ebfu c\u01a1 th\u1ec3 ch\u1ebft, tim s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t c\u01a1 quan s\u1ed1ng.<\/p>\n

    \u23f3 Qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi v\u00e0 b\u1ed9 nh\u1edb<\/h2>\n

    M\u1ed9t trong nh\u1eefng h\u1ec7 qu\u1ea3 k\u1ef9 thu\u1eadt ch\u00ednh c\u1ee7a s\u1ef1 k\u1ebft h\u1ee3p l\u00e0 c\u00e1ch qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb. Trong nhi\u1ec1u m\u00f4 h\u00ecnh l\u1eadp tr\u00ecnh, \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed5ng h\u1ee3p ch\u1ecbu tr\u00e1ch nhi\u1ec7m c\u1ea5p ph\u00e1t v\u00e0 gi\u1ea3i ph\u00f3ng b\u1ed9 nh\u1edb cho c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3.<\/p>\n

      \n
    • C\u1ea5p ph\u00e1t:<\/strong> Khi \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed5ng h\u1ee3p \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o, n\u00f3 s\u1ebd kh\u1edfi t\u1ea1o c\u00e1c ph\u1ea7n c\u1ee7a n\u00f3.<\/li>\n
    • Gi\u1ea3i ph\u00f3ng:<\/strong> Khi \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed5ng h\u1ee3p b\u1ecb h\u1ee7y, n\u00f3 s\u1ebd h\u1ee7y c\u00e1c ph\u1ea7n c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch \u0111\u1ec7 quy.<\/li>\n
    • Tr\u01b0\u1eddng h\u1ee3p ngo\u1ea1i l\u1ec7:<\/strong> C\u00f3 th\u1ec3 c\u1ea7n tham chi\u1ebfu r\u00f5 r\u00e0ng \u0111\u1ebfn c\u00e1c ph\u1ea7n n\u1ebfu c\u1ea7n truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n

      Vi\u1ec7c qu\u1ea3n l\u00fd t\u1ef1 \u0111\u1ed9ng n\u00e0y l\u00e0m gi\u1ea3m nguy c\u01a1 r\u00f2 r\u1ec9 b\u1ed9 nh\u1edb v\u00e0 con tr\u1ecf treo. Tuy nhi\u00ean, n\u00f3 mang l\u1ea1i s\u1ef1 c\u1ee9ng nh\u1eafc c\u1ea7n \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc so v\u1edbi t\u00ednh linh ho\u1ea1t c\u1ee7a s\u1ef1 k\u1ebft h\u1ee3p. N\u1ebfu m\u1ed9t ph\u1ea7n c\u1ea7n \u0111\u01b0\u1ee3c chia s\u1ebb gi\u1eefa nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed5ng h\u1ee3p, th\u00ec s\u1ef1 k\u1ebft h\u1ee3p th\u01b0\u1eddng l\u00e0 l\u1ef1a ch\u1ecdn sai.<\/p>\n

      \ud83d\udee0\ufe0f C\u00e1c m\u1eabu tri\u1ec3n khai<\/h2>\n

      Vi\u1ec7c tri\u1ec3n khai s\u1ef1 k\u1ebft h\u1ee3p \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd c\u1ea9n th\u1eadn \u0111\u1ebfn c\u00e1ch truy\u1ec1n tham chi\u1ebfu. C\u00e1c m\u1eabu sau \u0111\u00e2y gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a m\u1ed1i quan h\u1ec7.<\/p>\n

      1. Ti\u00eam v\u00e0o h\u00e0m t\u1ea1o<\/h3>\n

      Ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t bao g\u1ed3m vi\u1ec7c truy\u1ec1n c\u00e1c th\u1ec3 hi\u1ec7n th\u00e0nh ph\u1ea7n v\u00e0o h\u00e0m t\u1ea1o c\u1ee7a t\u1ed5 h\u1ee3p. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t t\u1ed5 h\u1ee3p kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu thi\u1ebfu c\u00e1c b\u1ed9 ph\u1eadn c\u1ea7n thi\u1ebft.<\/p>\n

        \n
      • \u0110\u1ea3m b\u1ea3o tr\u1ea1ng th\u00e1i kh\u1edfi t\u1ea1o.<\/li>\n
      • C\u01b0\u1ee1ng ch\u1ebf t\u00ednh b\u1ea5t bi\u1ebfn c\u1ee7a tham chi\u1ebfu n\u1ebfu thu\u1ed9c t\u00ednh ch\u1ec9 \u0111\u1ecdc.<\/li>\n
      • Ng\u0103n ch\u1eb7n vi\u1ec7c t\u1ea1o ra c\u00e1c tr\u1ea1ng th\u00e1i kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n<\/ul>\n

        2. Truy c\u1eadp \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i<\/h3>\n

        C\u00e1c th\u00e0nh ph\u1ea7n n\u00f3i chung n\u00ean \u0111\u01b0\u1ee3c \u1ea9n \u0111i. Vi\u1ec7c cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c getter tr\u1ea3 v\u1ec1 tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t ph\u1ea7n c\u00f3 th\u1ec3 ph\u00e1 v\u1ee1 t\u00ednh \u0111\u00f3ng g\u00f3i c\u1ee7a v\u00f2ng \u0111\u1eddi. N\u1ebfu m\u1ed9t kh\u00e1ch h\u00e0ng nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t tham chi\u1ebfu tr\u1ef1c ti\u1ebfp, h\u1ecd c\u00f3 th\u1ec3 thay \u0111\u1ed5i ph\u1ea7n \u0111\u00f3 theo c\u00e1ch l\u00e0m t\u1ed5n h\u1ea1i \u0111\u1ebfn to\u00e0n b\u1ed9.<\/p>\n

          \n
        • S\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c truy c\u1eadp tr\u1ea3 v\u1ec1 b\u1ea3n sao ho\u1eb7c giao di\u1ec7n.<\/li>\n
        • H\u1ea1n ch\u1ebf vi\u1ec7c s\u1eeda \u0111\u1ed5i tr\u1ef1c ti\u1ebfp c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea7n.<\/li>\n
        • \u0110\u1ea3m b\u1ea3o t\u1ed5 h\u1ee3p ki\u1ec3m so\u00e1t logic s\u1eeda \u0111\u1ed5i.<\/li>\n<\/ul>\n

          3. Ph\u00e1 h\u1ee7y \u0111\u1ec7 quy<\/h3>\n

          Khi t\u1ed5 h\u1ee3p b\u1ecb lo\u1ea1i b\u1ecf, h\u1ec7 th\u1ed1ng ph\u1ea3i \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n l\u1ed3ng gh\u00e9p \u0111\u1ec1u \u0111\u01b0\u1ee3c d\u1ecdn d\u1eb9p. Trong c\u00e1c ng\u00f4n ng\u1eef c\u00f3 thu gom r\u00e1c, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ng\u1ea7m. Trong qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb th\u1ee7 c\u00f4ng, t\u1ed5 h\u1ee3p ph\u1ea3i g\u1ecdi r\u00f5 r\u00e0ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ph\u00e1 h\u1ee7y tr\u00ean c\u00e1c ph\u1ea7n c\u1ee7a n\u00f3.<\/p>\n

          \ud83d\udd17 M\u1ed1i quan h\u1ec7 v\u1edbi c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf<\/h2>\n

          Vi\u1ec7c k\u1ebft h\u1ee3p (composition) ph\u00f9 h\u1ee3p ch\u1eb7t ch\u1ebd v\u1edbi m\u1ed9t s\u1ed1 nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf c\u1ed1t l\u00f5i \u0111i\u1ec1u h\u01b0\u1edbng ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m d\u1ec5 b\u1ea3o tr\u00ec.<\/p>\n

          Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m \u0111\u01a1n nh\u1ea5t<\/h3>\n

          Vi\u1ec7c k\u1ebft h\u1ee3p khuy\u1ebfn kh\u00edch chia nh\u1ecf m\u1ed9t l\u1edbp l\u1edbn th\u00e0nh c\u00e1c th\u00e0nh ph\u1ea7n nh\u1ecf h\u01a1n, t\u1eadp trung v\u00e0o m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3. M\u1ed7i th\u00e0nh ph\u1ea7n x\u1eed l\u00fd m\u1ed9t kh\u00eda c\u1ea1nh nh\u1ea5t \u0111\u1ecbnh c\u1ee7a to\u00e0n b\u1ed9. S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y khi\u1ebfn m\u00e3 ngu\u1ed3n d\u1ec5 ki\u1ec3m th\u1eed v\u00e0 s\u1eeda \u0111\u1ed5i h\u01a1n.<\/p>\n

          Nguy\u00ean t\u1eafc M\u1edf\/\u0110\u00f3ng<\/h3>\n

          B\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p h\u00e0nh vi thay v\u00ec k\u1ebf th\u1eeba ch\u00fang, c\u00e1c l\u1edbp c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i m\u00e3 hi\u1ec7n c\u00f3. B\u1ea1n c\u00f3 th\u1ec3 thay th\u1ebf m\u1ed9t th\u00e0nh ph\u1ea7n b\u1eb1ng m\u1ed9t th\u00e0nh ph\u1ea7n kh\u00e1c th\u1ef1c hi\u1ec7n c\u00f9ng m\u1ed9t giao di\u1ec7n, thay \u0111\u1ed5i h\u00e0nh vi m\u1ed9t c\u00e1ch \u0111\u1ed9ng.<\/p>\n

          \u0110\u1ea3o ng\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c<\/h3>\n

          C\u00e1c module c\u1ea5p cao kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c module c\u1ea5p th\u1ea5p. C\u1ea3 hai \u0111\u1ec1u n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o tr\u1eebu t\u01b0\u1ee3ng. Vi\u1ec7c k\u1ebft h\u1ee3p cho ph\u00e9p t\u1ed5 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o giao di\u1ec7n c\u1ee7a ph\u1ea7n, cho ph\u00e9p thay \u0111\u1ed5i tri\u1ec3n khai c\u1ee7a ph\u1ea7n m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed5 h\u1ee3p.<\/p>\n

          \ud83d\udea7 Nh\u1eefng th\u00e1ch th\u1ee9c ph\u1ed5 bi\u1ebfn<\/h2>\n

          M\u1eb7c d\u00f9 k\u1ebft h\u1ee3p mang l\u1ea1i \u0111\u1ed9 b\u1ec1n v\u1eefng, n\u00f3 c\u0169ng t\u1ea1o ra nh\u1eefng th\u00e1ch th\u1ee9c c\u1ee5 th\u1ec3 m\u00e0 c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 ph\u1ea3i v\u01b0\u1ee3t qua.<\/p>\n

            \n
          • Kh\u1ea3 n\u0103ng ph\u1ee5 thu\u1ed9c v\u00f2ng:<\/strong> N\u1ebfu hai t\u1ed5 h\u1ee3p tham chi\u1ebfu l\u1eabn nhau, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t v\u00f2ng l\u1eb7p l\u00e0m ph\u1ee9c t\u1ea1p vi\u1ec7c qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi. Vi\u1ec7c ph\u00e1 v\u1ee1 c\u00e1c v\u00f2ng l\u1eb7p n\u00e0y th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi ph\u1ea3i gi\u1edbi thi\u1ec7u m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng trung gian ho\u1eb7c s\u1eed d\u1ee5ng tham chi\u1ebfu y\u1ebfu.<\/li>\n
          • \u0110\u1ed9 ph\u1ee9c t\u1ea1p ki\u1ec3m th\u1eed:<\/strong> Ki\u1ec3m th\u1eed m\u1ed9t t\u1ed5 h\u1ee3p \u0111\u00f2i h\u1ecfi ph\u1ea3i thi\u1ebft l\u1eadp c\u1ea5u tr\u00fac n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3. Vi\u1ec7c m\u00f4 ph\u1ecfng c\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 kh\u00f3 kh\u0103n n\u1ebfu ch\u00fang b\u1ecb r\u00e0ng bu\u1ed9c ch\u1eb7t ch\u1ebd.<\/li>\n
          • Chuy\u1ec3n \u0111\u1ed5i th\u00e0nh chu\u1ed7i (serialization):<\/strong> Vi\u1ec7c l\u01b0u v\u00e0 t\u1ea3i l\u1ea1i c\u00e1c \u0111\u1ed3 th\u1ecb \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p. Th\u1ee9 t\u1ef1 gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u l\u00e0 quan tr\u1ecdng. Th\u01b0\u1eddng th\u00ec to\u00e0n b\u1ed9 ph\u1ea3i \u0111\u01b0\u1ee3c t\u00e1i t\u1ea1o tr\u01b0\u1edbc khi c\u00e1c ph\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/li>\n
          • Chi ph\u00ed hi\u1ec7u su\u1ea5t:<\/strong> Vi\u1ec7c t\u1ea1o v\u00e0 h\u1ee7y c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng l\u1ed3ng gh\u00e9p l\u00e0m t\u0103ng chi ph\u00ed t\u00ednh to\u00e1n. Trong c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao, chi ph\u00ed n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c \u0111o l\u01b0\u1eddng.<\/li>\n<\/ul>\n

            \ud83d\udd04 T\u00e1i c\u1ea5u tr\u00fac T\u1eeb t\u00edch h\u1ee3p sang T\u00edch h\u1ee3p<\/h2>\n

            Khi m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, c\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 c\u1ea7n thay \u0111\u1ed5i. M\u1ed9t nhi\u1ec7m v\u1ee5 t\u00e1i c\u1ea5u tr\u00fac ph\u1ed5 bi\u1ebfn l\u00e0 chuy\u1ec3n t\u1eeb t\u00edch h\u1ee3p sang t\u00edch h\u1ee3p khi quy\u1ec1n s\u1edf h\u1eefu tr\u1edf n\u00ean r\u00f5 r\u00e0ng h\u01a1n.<\/p>\n

              \n
            1. X\u00e1c \u0111\u1ecbnh s\u1ef1 thay \u0111\u1ed5i:<\/strong> X\u00e1c \u0111\u1ecbnh xem ph\u1ea7n c\u00f3 n\u00ean b\u1ecb h\u1ee7y c\u00f9ng to\u00e0n b\u1ed9 hay kh\u00f4ng.<\/li>\n
            2. C\u1eadp nh\u1eadt logic v\u00f2ng \u0111\u1eddi:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng th\u00e0nh ph\u1ea7n ch\u1ecbu tr\u00e1ch nhi\u1ec7m h\u1ee7y ph\u1ea7n.<\/li>\n
            3. Xem x\u00e9t c\u00e1c tham chi\u1ebfu:<\/strong> Lo\u1ea1i b\u1ecf c\u00e1c tham chi\u1ebfu b\u00ean ngo\u00e0i cho ph\u00e9p t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/li>\n
            4. C\u1eadp nh\u1eadt ki\u1ec3m th\u1eed:<\/strong> X\u00e1c minh r\u1eb1ng c\u00e1c r\u00e0ng bu\u1ed9c v\u00f2ng \u0111\u1eddi m\u1edbi v\u1eabn \u0111\u00fang.<\/li>\n<\/ol>\n

              Ng\u01b0\u1ee3c l\u1ea1i, chuy\u1ec3n t\u1eeb t\u00edch h\u1ee3p sang t\u00edch h\u1ee3p l\u00e0 c\u1ea7n thi\u1ebft khi m\u1ed9t ph\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c chia s\u1ebb. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c l\u00e0m cho vi\u1ec7c t\u1ea1o ph\u1ea7n \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n b\u1ed9.<\/p>\n

              \ud83c\udf10 C\u00e1c t\u00ecnh hu\u1ed1ng m\u00f4 h\u00ecnh h\u00f3a trong th\u1ebf gi\u1edbi th\u1ef1c<\/h2>\n

              H\u00e3y c\u00f9ng xem c\u00e1ch \u0111i\u1ec1u n\u00e0y \u00e1p d\u1ee5ng v\u00e0o c\u00e1c m\u00f4 h\u00ecnh mi\u1ec1n ph\u1ed5 bi\u1ebfn.<\/p>\n

              C\u1ea3nh hu\u1ed1ng 1: H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00e0i li\u1ec7u<\/h3>\n

              M\u1ed9tT\u00e0i li\u1ec7u<\/code>ch\u1ee9aTrang<\/code>c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. N\u1ebfu t\u00e0i li\u1ec7u b\u1ecb x\u00f3a, c\u00e1c trang s\u1ebd kh\u00f4ng c\u00f2n li\u00ean quan. T\u00edch h\u1ee3p l\u00e0 ph\u00f9 h\u1ee3p \u1edf \u0111\u00e2y. T\u00e0i li\u1ec7u ki\u1ec3m so\u00e1t th\u1ee9 t\u1ef1 v\u00e0 s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a c\u00e1c trang.<\/p>\n

              C\u1ea3nh hu\u1ed1ng 2: \u0110\u01a1n h\u00e0ng Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed<\/h3>\n

              M\u1ed9t\u0110\u01a1n h\u00e0ng<\/code>ch\u1ee9aM\u1eb7t h\u00e0ng \u0111\u01a1n h\u00e0ng<\/code>c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Khi m\u1ed9t \u0111\u01a1n h\u00e0ng \u0111\u01b0\u1ee3c ho\u00e0n t\u1ea5t v\u00e0 l\u01b0u tr\u1eef, c\u00e1c m\u1eb7t h\u00e0ng v\u1eabn l\u00e0 d\u1eef li\u1ec7u l\u1ecbch s\u1eed. Tuy nhi\u00ean, n\u1ebfu \u0111\u01a1n h\u00e0ng b\u1ecb h\u1ee7y, c\u00e1c m\u1eb7t h\u00e0ng s\u1ebd b\u1ecb x\u00f3a. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y vi\u1ec7c s\u1eed d\u1ee5ng t\u00edch h\u1ee3p cho tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u01a1n h\u00e0ng.<\/p>\n

              C\u1ea3nh hu\u1ed1ng 3: Danh m\u1ee5c \u0111\u1ea7u t\u01b0 t\u00e0i ch\u00ednh<\/h3>\n

              M\u1ed9tDanh m\u1ee5c \u0111\u1ea7u t\u01b0<\/code>gi\u1eefT\u00e0i s\u1ea3n<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. T\u00e0i s\u1ea3n th\u01b0\u1eddng t\u1ed3n t\u1ea1i b\u00ean ngo\u00e0i danh m\u1ee5c \u0111\u1ea7u t\u01b0 (v\u00ed d\u1ee5: m\u1ed9t c\u1ed5 phi\u1ebfu tr\u00ean th\u1ecb tr\u01b0\u1eddng c\u00f4ng khai). Vi\u1ec7c lo\u1ea1i b\u1ecf m\u1ed9t t\u00e0i s\u1ea3n kh\u1ecfi danh m\u1ee5c \u0111\u1ea7u t\u01b0 kh\u00f4ng l\u00e0m ti\u00eau h\u1ee7y t\u00e0i s\u1ea3n \u0111\u00f3. Vi\u1ec7c t\u00edch h\u1ee3p l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang \u1edf \u0111\u00e2y.<\/p>\n

              \u2696\ufe0f Khung quy\u1ebft \u0111\u1ecbnh<\/h2>\n

              Khi quy\u1ebft \u0111\u1ecbnh c\u00f3 n\u00ean tri\u1ec3n khai t\u00ednh k\u1ebft h\u1ee3p hay kh\u00f4ng, h\u00e3y \u0111\u1eb7t ra c\u00e1c c\u00e2u h\u1ecfi sau:<\/p>\n

                \n
              • Ph\u1ea7n \u0111\u00f3 c\u00f3 v\u1ec1 m\u1eb7t logic ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t to\u00e0n th\u1ec3 duy nh\u1ea5t kh\u00f4ng?<\/li>\n
              • Ph\u1ea7n \u0111\u00f3 c\u00f3 n\u00ean b\u1ecb h\u1ee7y b\u1ecf n\u1ebfu to\u00e0n th\u1ec3 b\u1ecb lo\u1ea1i b\u1ecf kh\u00f4ng?<\/li>\n
              • Vi\u1ec7c t\u1ea1o ra ph\u1ea7n \u0111\u00f3 c\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o to\u00e0n th\u1ec3 kh\u00f4ng?<\/li>\n
              • Ch\u00fang ta c\u00f3 c\u1ea7n che gi\u1ea5u c\u1ea5u tr\u00fac b\u00ean trong kh\u1ecfi kh\u00e1ch h\u00e0ng b\u00ean ngo\u00e0i kh\u00f4ng?<\/li>\n<\/ul>\n

                N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi cho c\u00e1c c\u00e2u h\u1ecfi n\u00e0y lu\u00f4n l\u00e0 \u201cc\u00f3\u201d, th\u00ec k\u1ebft h\u1ee3p c\u00f3 kh\u1ea3 n\u0103ng l\u00e0 m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac ph\u00f9 h\u1ee3p. N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi l\u00e0 \u201ckh\u00f4ng\u201d, h\u00e3y c\u00e2n nh\u1eafc vi\u1ec7c t\u00edch h\u1ee3p ho\u1eb7c li\u00ean k\u1ebft.<\/p>\n

                \ud83d\udee1\ufe0f An to\u00e0n v\u00e0 nh\u1ea5t qu\u00e1n<\/h2>\n

                Duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n trong k\u1ebft h\u1ee3p \u0111\u00f2i h\u1ecfi ki\u1ec3m tra nghi\u00eam ng\u1eb7t. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c \u1edf tr\u1ea1ng th\u00e1i thi\u1ebfu m\u1ed9t ph\u1ea7n b\u1eaft bu\u1ed9c. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c thi th\u00f4ng qua:<\/p>\n

                  \n
                • Ki\u1ec3m tra trong h\u00e0m t\u1ea1o:<\/strong> N\u00e9m l\u1ed7i n\u1ebfu m\u1ed9t ph\u1ea7n b\u1eaft bu\u1ed9c l\u00e0 null.<\/li>\n
                • C\u00e1c b\u1ea5t bi\u1ebfn:<\/strong> Ki\u1ec3m tra c\u00e1c \u0111i\u1ec1u ki\u1ec7n tr\u01b0\u1edbc v\u00e0 sau khi thay \u0111\u1ed5i.<\/li>\n
                • C\u00e1c tr\u01b0\u1eddng ri\u00eang t\u01b0:<\/strong> Gi\u1eef c\u00e1c tham chi\u1ebfu \u0111\u1ebfn c\u00e1c ph\u1ea7n \u1edf ch\u1ebf \u0111\u1ed9 ri\u00eang t\u01b0 \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c can thi\u1ec7p t\u1eeb b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n

                  M\u1ee9c \u0111\u1ed9 ki\u1ec3m so\u00e1t n\u00e0y \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n \u1edf tr\u1ea1ng th\u00e1i h\u1ee3p l\u1ec7 trong su\u1ed1t qu\u00e1 tr\u00ecnh th\u1ef1c thi. N\u00f3 ng\u0103n ch\u1eb7n c\u00e1c t\u00ecnh hu\u1ed1ng m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u1ed1 g\u1eafng truy c\u1eadp trang c\u1ee7a m\u1ed9t t\u00e0i li\u1ec7u kh\u00f4ng t\u1ed3n t\u1ea1i.<\/p>\n

                  \ud83d\udcc8 C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/h2>\n

                  Khi s\u1ed1 l\u01b0\u1ee3ng l\u1edbp t\u0103ng l\u00ean, \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a c\u00e2y k\u1ebft h\u1ee3p c\u00f3 th\u1ec3 gia t\u0103ng. Vi\u1ec7c l\u1ed3ng gh\u00e9p s\u00e2u c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn:<\/p>\n

                    \n
                  • Th\u1eddi gian kh\u1edfi t\u1ea1o d\u00e0i.<\/li>\n
                  • \u0110\u01b0\u1eddng \u0111i \u0111i\u1ec1u h\u01b0\u1edbng kh\u00f3 kh\u0103n.<\/li>\n
                  • S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f3 \u0111\u1ecdc h\u01a1n.<\/li>\n<\/ul>\n

                    Ng\u01b0\u1eddi thi\u1ebft k\u1ebf n\u00ean h\u01b0\u1edbng \u0111\u1ebfn c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p n\u00f4ng khi c\u00f3 th\u1ec3. L\u00e0m ph\u1eb3ng c\u1ea5u tr\u00fac th\u01b0\u1eddng c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec. N\u1ebfu m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p ch\u1ee9a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p kh\u00e1c, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p b\u00ean trong kh\u00f4ng ph\u1ea3i l\u00e0 chi ti\u1ebft tri\u1ec3n khai c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng b\u00ean ngo\u00e0i.<\/p>\n

                    \ud83e\uddea Chi\u1ebfn l\u01b0\u1ee3c ki\u1ec3m th\u1eed<\/h2>\n

                    Ki\u1ec3m th\u1eed c\u00e1c h\u1ec7 th\u1ed1ng n\u1eb7ng v\u1ec1 k\u1ebft h\u1ee3p \u0111\u00f2i h\u1ecfi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u1ee5 th\u1ec3.<\/p>\n

                      \n
                    • Ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb:<\/strong> Ki\u1ec3m th\u1eed \u0111\u1ed1i t\u01b0\u1ee3ng k\u1ebft h\u1ee3p m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng gi\u1ea3 l\u1eadp cho c\u00e1c ph\u1ea7n c\u1ee7a n\u00f3.<\/li>\n
                    • Ki\u1ec3m th\u1eed t\u00edch h\u1ee3p:<\/strong> X\u00e1c minh r\u1eb1ng c\u00e1c s\u1ef1 ki\u1ec7n v\u00f2ng \u0111\u1eddi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u0111\u00fang c\u00e1ch tr\u00ean to\u00e0n b\u1ed9 \u0111\u1ed3 th\u1ecb.<\/li>\n
                    • Ki\u1ec3m th\u1eed tr\u1ea1ng th\u00e1i:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng b\u1ed9 ph\u1eadn kh\u00f4ng th\u1ec3 b\u1ecb thay \u0111\u1ed5i th\u00e0nh tr\u1ea1ng th\u00e1i kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n<\/ul>\n

                      C\u00e1c b\u00e0i ki\u1ec3m th\u1eed t\u1ef1 \u0111\u1ed9ng n\u00ean bao ph\u1ee7 \u0111\u01b0\u1eddng d\u1eabn h\u1ee7y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 t\u00e0i nguy\u00ean n\u00e0o b\u1ecb r\u00f2 r\u1ec9. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c m\u00f4i tr\u01b0\u1eddng c\u00f3 t\u00e0i nguy\u00ean b\u1ed9 nh\u1edb h\u1ea1n ch\u1ebf.<\/p>\n

                      \ud83d\udd2e C\u1ea5u tr\u00fac b\u1ec1n v\u1eefng trong t\u01b0\u01a1ng lai<\/h2>\n

                      Thi\u1ebft k\u1ebf v\u1edbi t\u01b0 t\u01b0\u1edfng k\u1ebft h\u1ee3p gi\u00fap h\u1ec7 th\u1ed1ng s\u1eb5n s\u00e0ng cho nh\u1eefng thay \u0111\u1ed5i trong t\u01b0\u01a1ng lai. N\u1ebfu y\u00eau c\u1ea7u thay \u0111\u1ed5i \u0111\u1ec3 cho ph\u00e9p c\u00e1c b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c chia s\u1ebb, vi\u1ec7c chuy\u1ec3n t\u1eeb k\u1ebft h\u1ee3p sang t\u1ed5ng h\u1ee3p l\u00e0 m\u1ed9t thay \u0111\u1ed5i c\u1ee5c b\u1ed9. Vi\u1ec7c chuy\u1ec3n t\u1eeb k\u1ebf th\u1eeba sang k\u1ebft h\u1ee3p l\u00e0 m\u1ed9t thay \u0111\u1ed5i c\u1ea5u tr\u00fac th\u01b0\u1eddng l\u00e0m \u0111\u01a1n gi\u1ea3n h\u00f3a c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p.<\/p>\n

                      B\u1eb1ng c\u00e1ch \u01b0u ti\u00ean k\u1ebft h\u1ee3p, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng mang t\u00ednh module v\u00e0 v\u1eefng ch\u1eafc. M\u00f4 h\u00ecnh s\u1edf h\u1eefu r\u00f5 r\u00e0ng gi\u00fap gi\u1ea3m s\u1ef1 m\u01a1 h\u1ed3 v\u1ec1 ai qu\u1ea3n l\u00fd m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u c\u1ee5 th\u1ec3.<\/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), vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c l\u00e0 quan tr\u1ecdng kh\u00f4ng k\u00e9m g\u00ec vi\u1ec7c x\u00e1c \u0111\u1ecbnh…<\/p>\n","protected":false},"author":1,"featured_media":1931,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"M\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p trong c\u1ea5u tr\u00fac l\u1edbp: H\u01b0\u1edbng d\u1eabn OOAD \ud83c\udfd7\ufe0f","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 c\u00e1c m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Hi\u1ec3u v\u1ec1 qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi, quy\u1ec1n s\u1edf h\u1eefu v\u00e0 c\u00e1c m\u1eabu c\u1ea5u tr\u00fac l\u1edbp. 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