{"id":87,"date":"2026-04-07T02:58:31","date_gmt":"2026-04-07T02:58:31","guid":{"rendered":"https:\/\/www.go-notes.com\/vn\/uml-class-diagram-overview\/"},"modified":"2026-04-07T02:58:31","modified_gmt":"2026-04-07T02:58:31","slug":"uml-class-diagram-overview","status":"publish","type":"post","link":"https:\/\/www.go-notes.com\/vn\/uml-class-diagram-overview\/","title":{"rendered":"T\u1ed5ng quan to\u00e0n di\u1ec7n v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp UML"},"content":{"rendered":"

K\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o tr\u1ef1c quan h\u00f3a \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p. Trong s\u1ed1 c\u00e1c c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a s\u1eb5n c\u00f3, Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) \u0111\u01b0\u1ee3c xem l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh. C\u1ee5 th\u1ec3, s\u01a1 \u0111\u1ed3 l\u1edbp UML \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf quan tr\u1ecdng cho thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 ghi l\u1ea1i c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng, x\u00e1c \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u v\u00e0 h\u00e0nh vi \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c c\u01a1 ch\u1ebf, c\u00fa ph\u00e1p v\u00e0 \u1ee9ng d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp m\u00e0 kh\u00f4ng tham chi\u1ebfu \u0111\u1ebfn c\u00e1c c\u00f4ng c\u1ee5 ph\u1ea7n m\u1ec1m c\u1ee5 th\u1ec3.<\/p>\n

Hi\u1ec3u r\u00f5 c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi c\u00e1c ki\u1ebfn tr\u00fac s\u01b0, nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 c\u00e1c b\u00ean li\u00ean quan. Ch\u00fang cung c\u1ea5p m\u1ed9t ng\u00f4n ng\u1eef chung gi\u00fap gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 trong su\u1ed1t v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 tr\u01b0\u1edbc khi vi\u1ebft m\u00e3, c\u00e1c \u0111\u1ed9i ng\u0169 c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n s\u1edbm nh\u1eefng khi\u1ebfm khuy\u1ebft thi\u1ebft k\u1ebf ti\u1ec1m \u1ea9n. T\u00e0i li\u1ec7u n\u00e0y \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o to\u00e0n di\u1ec7n \u0111\u1ec3 th\u00e0nh th\u1ea1o c\u00e1ch bi\u1ec3u di\u1ec5n tr\u1ef1c quan ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m.<\/p>\n

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\"Whimsical<\/figure>\n<\/div>\n

\ud83d\udcd0 S\u01a1 \u0111\u1ed3 l\u1edbp UML l\u00e0 g\u00ec?<\/h2>\n

S\u01a1 \u0111\u1ed3 l\u1edbp UML l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, thao t\u00e1c v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong h\u1ec7 th\u1ed1ng. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 t\u1eadp trung v\u00e0o h\u00e0nh vi \u0111\u1ed9ng theo th\u1eddi gian, s\u01a1 \u0111\u1ed3 l\u1edbp t\u1eadp trung v\u00e0o c\u1ea5u tr\u00fac d\u1ef1a tr\u00ean danh t\u1eeb c\u1ee7a mi\u1ec1n.<\/p>\n

Nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh bao g\u1ed3m:<\/p>\n

    \n
  • G\u00f3c nh\u00ecn t\u0129nh:<\/strong> N\u00f3 bi\u1ec3u di\u1ec5n h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t chu\u1ed7i s\u1ef1 ki\u1ec7n.<\/li>\n
  • T\u1eadp trung v\u00e0o h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> N\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho c\u00e1c ng\u00f4n ng\u1eef h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0 Java, C++ v\u00e0 Python.<\/li>\n
  • Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a:<\/strong> N\u00f3 cho ph\u00e9p c\u00e1c \u0111\u1ed9i ng\u0169 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng c\u00f9ng v\u1edbi chi ti\u1ebft tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/li>\n
  • T\u00e0i li\u1ec7u:<\/strong> N\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng, thay \u0111\u1ed5i c\u00f9ng v\u1edbi c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n.<\/li>\n<\/ul>\n

    Khi thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng, c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u00e2y l\u1edbp trong m\u00e3 ngu\u1ed3n. Ch\u00fang \u0111\u1ea3m b\u1ea3o r\u1eb1ng thi\u1ebft k\u1ebf logic ph\u00f9 h\u1ee3p v\u1edbi tri\u1ec3n khai th\u1ef1c t\u1ebf.<\/p>\n

    \ud83e\uddf1 Gi\u1ea3i ph\u1eabu c\u1ee7a m\u1ed9t l\u1edbp<\/h2>\n

    \u1ede trung t\u00e2m c\u1ee7a m\u1ecdi s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 ch\u00ednh l\u1edbp \u0111\u00f3. Trong k\u00fd hi\u1ec7u UML, m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt chia th\u00e0nh ba ng\u0103n. M\u1ed7i ng\u0103n c\u00f3 m\u1ed9t m\u1ee5c \u0111\u00edch ri\u00eang bi\u1ec7t trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh danh t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a th\u1ef1c th\u1ec3.<\/p>\n

    1. Ng\u0103n t\u00ean l\u1edbp<\/h3>\n

    Ph\u1ea7n tr\u00ean ch\u1ee9a t\u00ean c\u1ee7a l\u1edbp. C\u00e1c quy t\u1eafc \u0111\u1eb7t t\u00ean \u1edf \u0111\u00e2y r\u1ea5t quan tr\u1ecdng. T\u00ean ph\u1ea3i l\u00e0 danh t\u1eeb v\u00e0 vi\u1ebft hoa ch\u1eef c\u00e1i \u0111\u1ea7u (PascalCase). V\u00ed d\u1ee5, Kh\u00e1ch h\u00e0ng<\/code>, \u0110\u01a1n h\u00e0ng<\/code>, ho\u1eb7c B\u1ed9 x\u1eed l\u00fd thanh to\u00e1n<\/code>. Ph\u1ea7n n\u00e0y x\u00e1c \u0111\u1ecbnh lo\u1ea1i \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a.<\/p>\n

    2. Ng\u0103n thu\u1ed9c t\u00ednh<\/h3>\n

    Ph\u1ea7n gi\u1eefa li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c th\u00e0nh vi\u00ean d\u1eef li\u1ec7u c\u1ee7a l\u1edbp. Nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0y \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1ed7i thu\u1ed9c t\u00ednh th\u01b0\u1eddng bao g\u1ed3m:<\/p>\n

      \n
    • Quy\u1ec1n truy c\u1eadp:<\/strong> M\u1ed9t k\u00fd hi\u1ec7u bi\u1ec3u th\u1ecb m\u1ee9c \u0111\u1ed9 truy c\u1eadp (+, -, #, ~).<\/li>\n
    • T\u00ean:<\/strong> T\u00ean bi\u1ebfn (d\u1ea1ng camelCase).<\/li>\n
    • Lo\u1ea1i:<\/strong> Ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5: String, Integer, Boolean).<\/li>\n
    • Gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh:<\/strong> Gi\u00e1 tr\u1ecb kh\u1edfi t\u1ea1o t\u00f9y ch\u1ecdn (v\u00ed d\u1ee5:active = true<\/code>).<\/li>\n<\/ul>\n

      3. Khu v\u1ef1c Thao t\u00e1c<\/h3>\n

      Ph\u1ea7n d\u01b0\u1edbi \u0111\u1ecbnh ngh\u0129a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c h\u00e0nh vi c\u00f3 s\u1eb5n cho l\u1edbp. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 thu\u1ed9c t\u00ednh, c\u00e1c thao t\u00e1c bao g\u1ed3m t\u00ednh kh\u1ea3 ki\u1ebfn, t\u00ean, tham s\u1ed1 v\u00e0 ki\u1ec3u tr\u1ea3 v\u1ec1. V\u00ed d\u1ee5,+ calculateTotal(): Decimal<\/code>.<\/p>\n

      D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u1ec1 c\u1ea5u tr\u00fac l\u1edbp ti\u00eau chu\u1ea9n:<\/p>\n\n\n\n\n\n\n\n
      Khu v\u1ef1c<\/th>\nN\u1ed9i dung<\/th>\nV\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
      T\u00ean<\/td>\n\u0110\u1ecbnh danh l\u1edbp<\/td>\nBankAccount<\/code><\/td>\n<\/tr>\n
      Thu\u1ed9c t\u00ednh<\/td>\nThu\u1ed9c t\u00ednh d\u1eef li\u1ec7u<\/td>\n+ balance: Decimal<\/code><\/td>\n<\/tr>\n
      Thao t\u00e1c<\/td>\nPh\u01b0\u01a1ng th\u1ee9c\/H\u00e0nh vi<\/td>\n+ deposit(amount: Decimal)<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \ud83d\udd17 Hi\u1ec3u v\u1ec1 c\u00e1c m\u1ed1i quan h\u1ec7<\/h2>\n

      C\u00e1c l\u1edbp hi\u1ebfm khi t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. Ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng th\u1ed1ng nh\u1ea5t. UML \u0111\u1ecbnh ngh\u0129a m\u1ed9t s\u1ed1 lo\u1ea1i m\u1ed1i quan h\u1ec7 \u0111\u1ec3 m\u00f4 t\u1ea3 c\u00e1c t\u01b0\u01a1ng t\u00e1c n\u00e0y. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa ch\u00fang l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c.<\/p>\n

      1. Li\u00ean k\u1ebft<\/h3>\n

      M\u1ed9t li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac gi\u1eefa hai l\u1edbp. N\u00f3 cho th\u1ea5y c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/p>\n

        \n
      • H\u01b0\u1edbng:<\/strong> C\u00f3 th\u1ec3 l\u00e0 m\u1ed9t chi\u1ec1u (m\u0169i t\u00ean) ho\u1eb7c hai chi\u1ec1u (\u0111\u01b0\u1eddng th\u1eb3ng).<\/li>\n
      • T\u00ean vai tr\u00f2:<\/strong>M\u00f4 t\u1ea3 m\u1ee5c \u0111\u00edch c\u1ee7a li\u00ean k\u1ebft t\u1eeb g\u00f3c nh\u00ecn c\u1ee7a m\u1ed9t l\u1edbp.<\/li>\n
      • \u0110a d\u1ea1ng:<\/strong>X\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n tham gia v\u00e0o m\u1ed1i quan h\u1ec7.<\/li>\n<\/ul>\n

        V\u00ed d\u1ee5, m\u1ed9t Sinh vi\u00ean<\/code> tham gia v\u00e0o m\u1ed9t Kh\u00f3a h\u1ecdc<\/code>. Li\u00ean k\u1ebft ng\u1ee5 \u00fd r\u1eb1ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng sinh vi\u00ean gi\u1eef m\u1ed9t tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f3a h\u1ecdc.<\/p>\n

        2. T\u00edch h\u1ee3p<\/h3>\n

        T\u00edch h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u1eb7c bi\u1ec7t c\u1ee7a li\u00ean k\u1ebft, bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 to\u00e0n b\u1ed9-ph\u1ea7n, trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n b\u1ed9. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 l\u00e0 m\u1ed1i quan h\u1ec7 “c\u00f3-m\u1ed9t”.<\/p>\n

          \n
        • K\u00fd hi\u1ec7u:<\/strong> M\u1ed9t h\u00ecnh kim c\u01b0\u01a1ng r\u1ed7ng \u1edf \u0111\u1ea7u “to\u00e0n b\u1ed9” c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng.<\/li>\n
        • Chu k\u1ef3 s\u1ed1ng:<\/strong> N\u1ebfu to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, ph\u1ea7n v\u1eabn ti\u1ebfp t\u1ee5c t\u1ed3n t\u1ea1i.<\/li>\n<\/ul>\n

          X\u00e9t m\u1ed9t B\u1ed9 ph\u1eadn<\/code> v\u00e0 Gi\u1ea3ng vi\u00ean<\/code>. N\u1ebfu b\u1ed9 ph\u1eadn b\u1ecb gi\u1ea3i th\u1ec3, gi\u1ea3ng vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i nh\u01b0 m\u1ed9t c\u00e1 th\u1ec3 ri\u00eang bi\u1ec7t. Gi\u1ea3ng vi\u00ean \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p b\u1edfi b\u1ed9 ph\u1eadn, nh\u01b0ng kh\u00f4ng thu\u1ed9c v\u1ec1 n\u00f3 m\u1ed9t c\u00e1ch \u0111\u1ed9c quy\u1ec1n.<\/p>\n

          3. K\u1ebft h\u1ee3p<\/h3>\n

          K\u1ebft h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a t\u00edch h\u1ee3p. N\u00f3 ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu nghi\u00eam ng\u1eb7t v\u00e0 ph\u1ee5 thu\u1ed9c v\u1ec1 chu k\u1ef3 s\u1ed1ng. Ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n b\u1ed9.<\/p>\n

            \n
          • K\u00fd hi\u1ec7u:<\/strong> M\u1ed9t h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y \u1edf \u0111\u1ea7u “to\u00e0n b\u1ed9”.<\/li>\n
          • Chu k\u1ef3 s\u1ed1ng:<\/strong> N\u1ebfu to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, c\u00e1c ph\u1ea7n c\u0169ng b\u1ecb h\u1ee7y theo.<\/li>\n
          • T\u00ednh \u0111\u1ed9c quy\u1ec1n:<\/strong> M\u1ed9t ph\u1ea7n th\u01b0\u1eddng ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t to\u00e0n b\u1ed9 duy nh\u1ea5t.<\/li>\n<\/ul>\n

            M\u1ed9t v\u00ed d\u1ee5 ti\u00eau bi\u1ec3u l\u00e0 m\u1ed9t Ng\u00f4i nh\u00e0<\/code> v\u00e0 Ph\u00f2ng<\/code>. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i trong b\u1ed1i c\u1ea3nh \u0111\u00f3. C\u00e1c ph\u00f2ng \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb ng\u00f4i nh\u00e0.<\/p>\n

            4. T\u1ed5ng qu\u00e1t h\u00f3a (K\u1ebf th\u1eeba)<\/h3>\n

            T\u1ed5ng qu\u00e1t h\u00f3a bi\u1ec3u di\u1ec5n m\u1ed9t c\u1ea5u tr\u00fac k\u1ebf th\u1eeba. N\u00f3 cho ph\u00e9p m\u1ed9t l\u1edbp con k\u1ebf th\u1eeba c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c c\u1ee7a l\u1edbp cha. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y vi\u1ec7c t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n v\u00e0 \u0111a h\u00ecnh.<\/p>\n

              \n
            • K\u00fd hi\u1ec7u:<\/strong> M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi m\u0169i t\u00ean tam gi\u00e1c r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha.<\/li>\n
            • M\u1ed1i quan h\u1ec7 L\u00e0-M\u1ed9t:<\/strong> L\u1edbp con l\u00e0 m\u1ed9t ki\u1ec3u c\u1ee7a l\u1edbp cha.<\/li>\n<\/ul>\n

              V\u00ed d\u1ee5, m\u1ed9t T\u00e0i kho\u1ea3n ti\u1ebft ki\u1ec7m<\/code> l\u00e0 m\u1ed9t ki\u1ec3u c\u1ee7a T\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng<\/code>. T\u00e0i kho\u1ea3n ti\u1ebft ki\u1ec7m k\u1ebf th\u1eeba c\u00e1c thu\u1ed9c t\u00ednh s\u1ed1 d\u01b0 v\u00e0 t\u00ean nh\u01b0ng th\u00eam logic t\u00ednh to\u00e1n l\u00e3i su\u1ea5t.<\/p>\n

              5. Ph\u1ee5 thu\u1ed9c<\/h3>\n

              Ph\u1ee5 thu\u1ed9c ch\u1ec9 ra m\u1ed9t m\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng, n\u01a1i thay \u0111\u1ed5i trong b\u1ea3n ch\u1ea5t c\u1ee7a ph\u1ea7n t\u1eed \u0111\u1ed9c l\u1eadp c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thay \u0111\u1ed5i trong ph\u1ea7n t\u1eed ph\u1ee5 thu\u1ed9c. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1ea1m th\u1eddi.<\/p>\n

                \n
              • K\u00fd hi\u1ec7u:<\/strong> M\u1ed9t \u0111\u01b0\u1eddng g\u1ea1ch n\u1ed1i v\u1edbi m\u0169i t\u00ean m\u1edf.<\/li>\n
              • S\u1eed d\u1ee5ng:<\/strong> Th\u01b0\u1eddng x\u1ea3y ra khi m\u1ed9t l\u1edbp s\u1eed d\u1ee5ng l\u1edbp kh\u00e1c nh\u01b0 tham s\u1ed1 trong m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n<\/ul>\n

                N\u1ebfu m\u1ed9t L\u1edbp t\u1ea1o b\u00e1o c\u00e1o<\/code> s\u1eed d\u1ee5ng m\u1ed9t L\u1edbp \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u<\/code> \u0111\u1ec3 \u0111\u1ecbnh d\u1ea1ng \u0111\u1ea7u ra, b\u1ed9 t\u1ea1o b\u00e1o c\u00e1o ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ed9 \u0111\u1ecbnh d\u1ea1ng. N\u1ebfu b\u1ed9 \u0111\u1ecbnh d\u1ea1ng thay \u0111\u1ed5i, b\u1ed9 t\u1ea1o b\u00e1o c\u00e1o c\u00f3 th\u1ec3 c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh.<\/p>\n

                6. Th\u1ef1c hi\u1ec7n (Tri\u1ec3n khai giao di\u1ec7n)<\/h3>\n

                Th\u1ef1c hi\u1ec7n k\u1ebft n\u1ed1i m\u1ed9t l\u1edbp v\u1edbi m\u1ed9t giao di\u1ec7n. N\u00f3 cho bi\u1ebft l\u1edbp \u0111\u00f3 \u0111\u1ea3m b\u1ea3o s\u1ebd tri\u1ec3n khai c\u00e1c thao t\u00e1c \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi giao di\u1ec7n.<\/p>\n

                  \n
                • K\u00fd hi\u1ec7u:<\/strong> M\u1ed9t \u0111\u01b0\u1eddng g\u1ea1ch n\u1ed1i v\u1edbi m\u0169i t\u00ean tam gi\u00e1c r\u1ed7ng.<\/li>\n
                • H\u1ee3p \u0111\u1ed3ng:<\/strong> L\u1edbp n\u00e0y tu\u00e2n th\u1ee7 h\u1ee3p \u0111\u1ed3ng giao di\u1ec7n.<\/li>\n<\/ul>\n

                  N\u1ebfu m\u1ed9t \u0110\u1ed9ng v\u1eadt<\/code> giao di\u1ec7n x\u00e1c \u0111\u1ecbnh makeSound()<\/code>, m\u1ed9t Ch\u00f3<\/code> l\u1edbp th\u1ef1c hi\u1ec7n giao di\u1ec7n n\u00e0y ph\u1ea3i tri\u1ec3n khai ph\u01b0\u01a1ng th\u1ee9c makeSound()<\/code> ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

                  \ud83d\udccf \u0110a d\u1ea1ng v\u00e0 Cardinality<\/h2>\n

                  \u0110a d\u1ea1ng x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf hai \u0111\u1ea7u \u0111\u01b0\u1eddng n\u1ed1i li\u00ean k\u1ebft. \u0110a d\u1ea1ng ch\u00ednh x\u00e1c gi\u00fap ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i logic trong thi\u1ebft k\u1ebf.<\/p>\n

                  C\u00e1c k\u00fd hi\u1ec7u \u0111a d\u1ea1ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

                    \n
                  • 1:<\/strong>\u0110\u00fang m\u1ed9t th\u1ec3 hi\u1ec7n.<\/li>\n
                  • 0..1:<\/strong>Kh\u00f4ng c\u00f3 ho\u1eb7c m\u1ed9t th\u1ec3 hi\u1ec7n (t\u00f9y ch\u1ecdn).<\/li>\n
                  • 1..*:<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u th\u1ec3 hi\u1ec7n.<\/li>\n
                  • 0..*:<\/strong>Kh\u00f4ng ho\u1eb7c nhi\u1ec1u th\u1ec3 hi\u1ec7n.<\/li>\n
                  • 1..3:<\/strong>T\u1eeb m\u1ed9t \u0111\u1ebfn ba th\u1ec3 hi\u1ec7n.<\/li>\n<\/ul>\n

                    Hi\u1ec3u r\u00f5 c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y gi\u00fap trong thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 logic x\u00e1c th\u1ef1c. V\u00ed d\u1ee5, m\u1ed9t \u0110\u01a1n h\u00e0ng<\/code> ph\u1ea3i ch\u1ee9a \u00edt nh\u1ea5t m\u1ed9t M\u1ee5c<\/code> (1..*), nh\u01b0ng m\u1ed9t Kh\u00e1ch h\u00e0ng<\/code> c\u00f3 th\u1ec3 kh\u00f4ng c\u00f3 \u0110\u01a1n h\u00e0ng<\/code> (0..*). Nh\u1eefng quy t\u1eafc n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n

                    \ud83d\udee0\ufe0f Nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf v\u00e0 th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/h2>\n

                    Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 v\u1ebd c\u00e1c h\u00ecnh h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng k\u1ebb. N\u00f3 \u0111\u00f2i h\u1ecfi tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m v\u1eefng ch\u1eafc. Nh\u1eefng s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf k\u00e9m s\u1ebd d\u1eabn \u0111\u1ebfn nh\u1eefng h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf k\u00e9m.<\/p>\n

                    1. T\u00ednh g\u1eafn k\u1ebft cao<\/h3>\n

                    Gi\u1eef c\u00e1c ch\u1ee9c n\u0103ng li\u00ean quan trong c\u00f9ng m\u1ed9t l\u1edbp. N\u1ebfu m\u1ed9t l\u1edbp x\u1eed l\u00fd k\u1ebft n\u1ed1i c\u01a1 s\u1edf d\u1eef li\u1ec7u, g\u1eedi email v\u00e0 hi\u1ec3n th\u1ecb giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, th\u00ec n\u00f3 vi ph\u1ea1m t\u00ednh g\u1eafn k\u1ebft. Chia c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y th\u00e0nh c\u00e1c l\u1edbp ri\u00eang bi\u1ec7t. T\u00ednh g\u1eafn k\u1ebft cao gi\u00fap c\u00e1c l\u1edbp d\u1ec5 hi\u1ec3u v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec h\u01a1n.<\/p>\n

                    2. T\u00ednh li\u00ean k\u1ebft th\u1ea5p<\/h3>\n

                    T\u1ed1i thi\u1ec3u h\u00f3a c\u00e1c ph\u1ee5 thu\u1ed9c gi\u1eefa c\u00e1c l\u1edbp. N\u1ebfu l\u1edbp A thay \u0111\u1ed5i, l\u1edbp B kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i b\u1ecb h\u1ecfng. S\u1eed d\u1ee5ng giao di\u1ec7n ho\u1eb7c ch\u00e8n ph\u1ee5 thu\u1ed9c \u0111\u1ec3 gi\u1ea3m s\u1ef1 li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd. \u0110i\u1ec1u n\u00e0y gi\u00fap h\u1ec7 th\u1ed1ng linh ho\u1ea1t v\u00e0 d\u1ec5 ki\u1ec3m th\u1eed h\u01a1n.<\/p>\n

                    3. Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t<\/h3>\n

                    M\u1ed7i l\u1edbp n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi t\u00ednh g\u1eafn k\u1ebft. M\u1ed9t Ng\u01b0\u1eddi d\u00f9ng<\/code>l\u1edbp n\u00ean qu\u1ea3n l\u00fd d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng, ch\u1ee9 kh\u00f4ng n\u00ean x\u1eed l\u00fd logic x\u00e1c th\u1ef1c \u0111\u0103ng nh\u1eadp. T\u00e1ch bi\u1ec7t c\u00e1c v\u1ea5n \u0111\u1ec1 s\u1ebd c\u1ea3i thi\u1ec7n t\u00ednh r\u00f5 r\u00e0ng.<\/p>\n

                    4. Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean<\/h3>\n

                    \u0110\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n gi\u00fap gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c. S\u1eed d\u1ee5ng ng\u00f4n ng\u1eef l\u0129nh v\u1ef1c. Thay v\u00ec \u0110\u1ed1i t\u01b0\u1ee3ng1<\/code>, h\u00e3y d\u00f9ng H\u00f3a \u0111\u01a1n<\/code>. Tr\u00e1nh d\u00f9ng vi\u1ebft t\u1eaft tr\u1eeb khi ch\u00fang l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh. T\u00ean ph\u1ea3i t\u1ef1 gi\u1ea3i th\u00edch \u0111\u01b0\u1ee3c.<\/p>\n

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

                    \u0110\u1eebng m\u00f4 h\u00ecnh h\u00f3a t\u1eebng tr\u01b0\u1eddng d\u1eef li\u1ec7u trong m\u1ed9t s\u01a1 \u0111\u1ed3 kh\u1ed5ng l\u1ed3. T\u1ea1o c\u00e1c g\u00f3c nh\u00ecn kh\u00e1c nhau cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c nhau. S\u01a1 \u0111\u1ed3 ki\u1ebfn tr\u00fac c\u1ea5p cao n\u00ean hi\u1ec3n th\u1ecb c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh, trong khi s\u01a1 \u0111\u1ed3 thi\u1ebft k\u1ebf chi ti\u1ebft n\u00ean hi\u1ec3n th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3. B\u1ed1i c\u1ea3nh s\u1ebd x\u00e1c \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 chi ti\u1ebft.<\/p>\n

                    \ud83d\udeab Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

                    Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap tinh ch\u1ec9nh m\u00f4 h\u00ecnh.<\/p>\n

                      \n
                    • M\u00f4 h\u00ecnh h\u00f3a qu\u00e1 m\u1ee9c:<\/strong>C\u1ed1 g\u1eafng \u00e1nh x\u1ea1 t\u1eebng thu\u1ed9c t\u00ednh s\u1ebd d\u1eabn \u0111\u1ebfn s\u1ef1 l\u1ed9n x\u1ed9n. H\u00e3y t\u1eadp trung v\u00e0o m\u00f4 h\u00ecnh l\u0129nh v\u1ef1c tr\u01b0\u1edbc.<\/li>\n
                    • Nh\u1ea7m l\u1eabn gi\u1eefa t\u00edch h\u1ee3p v\u00e0 k\u1ebft h\u1ee3p:<\/strong>\u0110\u00e2y l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t. H\u00e3y nh\u1edb ki\u1ec3m tra v\u00f2ng \u0111\u1eddi. N\u1ebfu b\u1ed9 ph\u1eadn v\u1eabn t\u1ed3n t\u1ea1i khi to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, th\u00ec \u0111\u00f3 l\u00e0 t\u00edch h\u1ee3p. N\u1ebfu kh\u00f4ng, \u0111\u00f3 l\u00e0 k\u1ebft h\u1ee3p.<\/li>\n
                    • B\u1ecf qua t\u00ednh kh\u1ea3 ki\u1ebfn:<\/strong>C\u00e1c t\u1eeb kh\u00f3a c\u00f4ng khai, ri\u00eang t\u01b0 v\u00e0 b\u1ea3o v\u1ec7 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch l\u1edbp t\u01b0\u01a1ng t\u00e1c v\u1edbi ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng. B\u1ecf qua ch\u00fang s\u1ebd che gi\u1ea5u c\u00e1c r\u00e0ng bu\u1ed9c quan tr\u1ecdng.<\/li>\n
                    • Ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n:<\/strong>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, \u0111i\u1ec1u n\u00e0y t\u1ea1o th\u00e0nh m\u1ed9t v\u00f2ng l\u1eb7p l\u00e0m ph\u1ee9c t\u1ea1p qu\u00e1 tr\u00ecnh t\u1ea3i v\u00e0 th\u1ef1c thi. Ph\u00e1 v\u1ee1 c\u00e1c v\u00f2ng l\u1eb7p b\u1eb1ng giao di\u1ec7n ho\u1eb7c nh\u00e0 m\u00e1y tr\u1eebu t\u01b0\u1ee3ng.<\/li>\n
                    • B\u1ecf qua c\u00e1c th\u00e0nh vi\u00ean t\u0129nh:<\/strong> C\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 thu\u1ed9c t\u00ednh t\u0129nh thu\u1ed9c v\u1ec1 l\u1edbp, ch\u1ee9 kh\u00f4ng ph\u1ea3i th\u1ec3 hi\u1ec7n. Ch\u00fang n\u00ean \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng (th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ea1ch ch\u00e2n trong s\u01a1 \u0111\u1ed3) \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u1edbi c\u00e1c th\u00e0nh vi\u00ean th\u1ec3 hi\u1ec7n.<\/li>\n<\/ul>\n

                      \ud83d\udcc8 \u1ee8ng d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c<\/h2>\n

                      S\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ec7u qu\u1ea3 nh\u1ea5t khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf c\u00e1c giai \u0111o\u1ea1n c\u1ee5 th\u1ec3 trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m.<\/p>\n

                      1. Ph\u00e2n t\u00edch y\u00eau c\u1ea7u<\/h3>\n

                      Trong giai \u0111o\u1ea1n ph\u00e2n t\u00edch, c\u00e1c s\u01a1 \u0111\u1ed3 gi\u00fap c\u00e1c b\u00ean li\u00ean quan h\u00ecnh dung \u0111\u01b0\u1ee3c l\u0129nh v\u1ef1c. Ch\u00fang x\u00e1c nh\u1eadn r\u1eb1ng \u0111\u1ed9i ng\u0169 hi\u1ec3u r\u00f5 c\u00e1c quy t\u1eafc kinh doanh v\u1ec1 c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 li\u00ean h\u1ec7 v\u1edbi nhau. \u0110i\u1ec1u n\u00e0y ng\u0103n ng\u1eeba c\u00f4ng vi\u1ec7c s\u1eeda \u0111\u1ed5i t\u1ed1n k\u00e9m v\u1ec1 sau.<\/p>\n

                      2. Thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng<\/h3>\n

                      C\u00e1c ki\u1ebfn tr\u00fac s\u01b0 s\u1eed d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 l\u1eadp k\u1ebf ho\u1ea1ch c\u1ea5u tr\u00fac. H\u1ecd quy\u1ebft \u0111\u1ecbnh v\u1ec1 c\u00e1c c\u1ea5p k\u1ebf th\u1eeba v\u00e0 c\u00e1c h\u1ee3p \u0111\u1ed3ng giao di\u1ec7n. Giai \u0111o\u1ea1n n\u00e0y \u0111\u1eb7t n\u1ec1n t\u1ea3ng cho c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n.<\/p>\n

                      3. T\u00e0i li\u1ec7u v\u00e0 l\u00e0m quen v\u1edbi h\u1ec7 th\u1ed1ng<\/h3>\n

                      \u0110\u1ed1i v\u1edbi c\u00e1c th\u00e0nh vi\u00ean m\u1edbi trong nh\u00f3m, s\u01a1 \u0111\u1ed3 l\u1edbp cung c\u1ea5p b\u1ea3n \u0111\u1ed3 cho c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n. Ch\u00fang gi\u1ea3i th\u00edch c\u00e1ch h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c m\u00e0 kh\u00f4ng c\u1ea7n ng\u01b0\u1eddi \u0111\u1ecdc ph\u1ea3i ph\u00e2n t\u00edch h\u00e0ng ng\u00e0n d\u00f2ng m\u00e3 ngu\u1ed3n.<\/p>\n

                      4. T\u00e1i c\u1ea5u tr\u00fac<\/h3>\n

                      Khi m\u00e3 ngu\u1ed3n c\u0169 tr\u1edf n\u00ean kh\u00f3 b\u1ea3o tr\u00ec, vi\u1ec7c t\u00e1i t\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp c\u00f3 th\u1ec3 ti\u1ebft l\u1ed9 tr\u1ea1ng th\u00e1i hi\u1ec7n t\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c \u0111\u1ed9i nh\u00f3m l\u00ean k\u1ebf ho\u1ea1ch chi\u1ebfn l\u01b0\u1ee3c t\u00e1i c\u1ea5u tr\u00fac \u0111\u1ec3 c\u1ea3i thi\u1ec7n c\u1ea5u tr\u00fac.<\/p>\n

                      \ud83d\udcca So s\u00e1nh c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7<\/h2>\n

                      \u0110\u1ec3 l\u00e0m r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7, h\u00e3y xem b\u1ea3ng so s\u00e1nh sau:<\/p>\n\n\n\n\n\n\n\n\n
                      M\u1ed1i quan h\u1ec7<\/th>\nK\u00fd hi\u1ec7u<\/th>\n\u0110\u1ed9 m\u1ea1nh<\/th>\nChu k\u1ef3 s\u1ed1ng<\/th>\nV\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
                      Li\u00ean k\u1ebft<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n<\/td>\nY\u1ebfu<\/td>\n\u0110\u1ed9c l\u1eadp<\/td>\nGi\u00e1o vi\u00ean d\u1ea1y h\u1ecdc sinh<\/td>\n<\/tr>\n
                      T\u1ed5 h\u1ee3p<\/td>\nH\u00ecnh kim c\u01b0\u01a1ng r\u1ed7ng<\/td>\nTrung b\u00ecnh<\/td>\n\u0110\u1ed9c l\u1eadp<\/td>\nTh\u01b0 vi\u1ec7n c\u00f3 S\u00e1ch<\/td>\n<\/tr>\n
                      Th\u00e0nh ph\u1ea7n<\/td>\nH\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y<\/td>\nM\u1ea1nh<\/td>\nPh\u1ee5 thu\u1ed9c<\/td>\nXe c\u00f3 \u0111\u1ed9ng c\u01a1<\/td>\n<\/tr>\n
                      T\u1ed5ng qu\u00e1t h\u00f3a<\/td>\nTam gi\u00e1c r\u1ed7ng<\/td>\nK\u1ebf th\u1eeba<\/td>\nChia s\u1ebb<\/td>\nH\u00ecnh tr\u00f2n l\u00e0 H\u00ecnh d\u1ea1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      Hi\u1ec3u r\u00f5 nh\u1eefng s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u00f4 h\u00ecnh ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c th\u1ef1c t\u1ebf kinh doanh. Vi\u1ec7c hi\u1ec3u sai m\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c kh\u00f3a ngo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u sai ho\u1eb7c tham chi\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng b\u1ecb l\u1ed7i trong m\u00e3 ngu\u1ed3n.<\/p>\n

                      \ud83d\udd0d C\u00e1c kh\u00e1i ni\u1ec7m n\u00e2ng cao<\/h2>\n

                      V\u01b0\u1ee3t ra ngo\u00e0i c\u00e1c c\u1ea5u tr\u00fac c\u01a1 b\u1ea3n, c\u00f3 nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e2ng cao gi\u00fap tinh ch\u1ec9nh m\u00f4 h\u00ecnh.<\/p>\n

                      L\u1edbp tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n

                      M\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o tr\u1ef1c ti\u1ebfp. N\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t m\u1eabu cho c\u00e1c l\u1edbp con. Trong s\u01a1 \u0111\u1ed3, t\u00ean th\u01b0\u1eddng \u0111\u01b0\u1ee3c in nghi\u00eang. \u0110i\u1ec1u n\u00e0y h\u1eefu \u00edch \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a h\u00e0nh vi chung m\u00e0 c\u00e1c l\u1edbp con ph\u1ea3i \u0111\u1eb7c bi\u1ec7t h\u00f3a.<\/p>\n

                      Giao di\u1ec7n<\/h3>\n

                      C\u00e1c giao di\u1ec7n \u0111\u1ecbnh ngh\u0129a m\u1ed9t h\u1ee3p \u0111\u1ed3ng m\u00e0 kh\u00f4ng c\u00f3 tri\u1ec3n khai. Ch\u00fang r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u00e1ch r\u1eddi c\u00e1c h\u1ec7 th\u1ed1ng. M\u1ed9t l\u1edbp c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec1u giao di\u1ec7n, cho ph\u00e9p k\u1ebft h\u1ee3p linh ho\u1ea1t. C\u00e1c giao di\u1ec7n th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n v\u1edbi m\u1ed9t d\u1ea5u <> ki\u1ec3u d\u00e1ng.<\/interface><\/p>\n

                      Thu\u1ed9c t\u00ednh t\u0129nh<\/h3>\n

                      C\u00e1c thu\u1ed9c t\u00ednh t\u0129nh \u0111\u01b0\u1ee3c chia s\u1ebb gi\u1eefa t\u1ea5t c\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng cho b\u1ed9 \u0111\u1ebfm ho\u1eb7c c\u00e0i \u0111\u1eb7t c\u1ea5u h\u00ecnh. Trong s\u01a1 \u0111\u1ed3, ch\u00fang \u0111\u01b0\u1ee3c g\u1ea1ch ch\u00e2n \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u1edbi c\u00e1c bi\u1ebfn th\u1ec3 hi\u1ec7n.<\/p>\n

                      \ud83d\udcdd Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng<\/h2>\n

                      S\u01a1 \u0111\u1ed3 l\u1edbp UML v\u1eabn l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 t\u1ea1o ra s\u1ef1 k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng v\u00e0 m\u00e3 ngu\u1ed3n c\u1ee5 th\u1ec3. B\u1eb1ng c\u00e1ch n\u1eafm v\u1eefng c\u00e1c th\u00e0nh ph\u1ea7n, m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t \u0111\u01b0\u1ee3c n\u00eau trong h\u01b0\u1edbng d\u1eabn n\u00e0y, c\u00e1c \u0111\u1ed9i ng\u0169 c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd, d\u1ec5 b\u1ea3o tr\u00ec. Ch\u00eca kh\u00f3a n\u1eb1m \u1edf s\u1ef1 r\u00f5 r\u00e0ng v\u00e0 ch\u00ednh x\u00e1c. S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t th\u00f4ng tin, ch\u1ee9 kh\u00f4ng ch\u1ec9 \u0111\u1ec3 ghi ch\u00e9p t\u00e0i li\u1ec7u. \u0110\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed7i h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ec1u ph\u1ee5c v\u1ee5 m\u1ed9t m\u1ee5c \u0111\u00edch trong ki\u1ebfn tr\u00fac t\u1ed5ng th\u1ec3.<\/p>\n

                      Khi c\u00e1c h\u1ec7 th\u1ed1ng ng\u00e0y c\u00e0ng ph\u1ee9c t\u1ea1p, nhu c\u1ea7u v\u1ec1 bi\u1ec3u di\u1ec5n c\u1ea5u tr\u00fac r\u00f5 r\u00e0ng c\u00e0ng t\u0103ng l\u00ean. Th\u01b0\u1eddng xuy\u00ean xem x\u00e9t v\u00e0 c\u1eadp nh\u1eadt c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y gi\u00fap \u0111\u1ed9i ng\u0169 lu\u00f4n \u0111\u1ed3ng b\u1ed9 v\u1edbi nhu c\u1ea7u kinh doanh \u0111ang thay \u0111\u1ed5i. D\u00f9 \u0111ang thi\u1ebft k\u1ebf m\u1ed9t c\u00f4ng c\u1ee5 nh\u1ecf hay m\u1ed9t n\u1ec1n t\u1ea3ng doanh nghi\u1ec7p l\u1edbn, c\u00e1c nguy\u00ean t\u1eafc m\u00f4 h\u00ecnh h\u00f3a l\u1edbp cung c\u1ea5p c\u1ea5u tr\u00fac c\u1ea7n thi\u1ebft cho th\u00e0nh c\u00f4ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                      K\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o tr\u1ef1c quan h\u00f3a \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p. Trong s\u1ed1 c\u00e1c c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a s\u1eb5n c\u00f3,…<\/p>\n","protected":false},"author":1,"featured_media":88,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u01b0\u1edbng d\u1eabn S\u01a1 \u0111\u1ed3 L\u1edbp UML: C\u00e1c th\u00e0nh ph\u1ea7n, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u \ud83c\udfd7\ufe0f","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch thi\u1ebft k\u1ebf c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp UML hi\u1ec7u qu\u1ea3. Bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n, m\u1ed1i quan h\u1ec7, k\u00fd hi\u1ec7u v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t cho thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. \ud83d\udcd0","inline_featured_image":false,"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[4],"tags":[5,7],"class_list":["post-87","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uml","tag-academic","tag-class-diagram"],"yoast_head":"\nH\u01b0\u1edbng d\u1eabn S\u01a1 \u0111\u1ed3 L\u1edbp UML: C\u00e1c th\u00e0nh ph\u1ea7n, m\u1ed1i quan h\u1ec7 v\u00e0 k\u00fd hi\u1ec7u \ud83c\udfd7\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch thi\u1ebft k\u1ebf c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp UML hi\u1ec7u qu\u1ea3. 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