{"id":119,"date":"2026-04-02T00:21:21","date_gmt":"2026-04-02T00:21:21","guid":{"rendered":"https:\/\/www.go-notes.com\/vn\/uml-class-diagram-element-breakdown\/"},"modified":"2026-04-02T00:21:21","modified_gmt":"2026-04-02T00:21:21","slug":"uml-class-diagram-element-breakdown","status":"publish","type":"post","link":"https:\/\/www.go-notes.com\/vn\/uml-class-diagram-element-breakdown\/","title":{"rendered":"Ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n: Kh\u00e1m ph\u00e1 t\u1eebng th\u00e0nh ph\u1ea7n trong s\u01a1 \u0111\u1ed3 l\u1edbp UML"},"content":{"rendered":"

Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng cho thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Trong s\u1ed1 c\u00e1c lo\u1ea1i s\u01a1 \u0111\u1ed3 kh\u00e1c nhau, s\u01a1 \u0111\u1ed3 l\u1edbp n\u1ed5i b\u1eadt l\u00e0 lo\u1ea1i quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Hi\u1ec3u r\u00f5 t\u1eebng th\u00e0nh ph\u1ea7n trong s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n, ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 nh\u00e0 ph\u00e2n t\u00edch \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng. H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 c\u1ea5u t\u1ea1o c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp UML, \u0111\u1ea3m b\u1ea3o b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc v\u00e0 t\u1ea1o ra ch\u00fang m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n

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

\ud83d\udd0d M\u1ee5c \u0111\u00edch c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp<\/h2>\n

S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac 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 c\u1ee7a h\u1ec7 th\u1ed1ng, thu\u1ed9c t\u00ednh, thao t\u00e1c v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ghi l\u1ea1i h\u00e0nh vi \u0111\u1ed9ng theo th\u1eddi gian, s\u01a1 \u0111\u1ed3 l\u1edbp lu\u00f4n \u1edf tr\u1ea1ng th\u00e1i t\u0129nh. Ch\u00fang ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 b\u1ea3n v\u1ebd ki\u1ebfn tr\u00fac cho m\u1ed9t t\u00f2a nh\u00e0, \u0111\u1ecbnh r\u00f5 n\u1ec1n t\u1ea3ng m\u00e0 m\u00e3 ngu\u1ed3n s\u1ebd \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng l\u00ean.<\/p>\n

C\u00e1c m\u1ee5c ti\u00eau ch\u00ednh bao g\u1ed3m:<\/p>\n

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  • T\u00e0i li\u1ec7u h\u00f3a quan \u0111i\u1ec3m t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
  • Cung c\u1ea5p c\u01a1 s\u1edf cho vi\u1ec7c sinh m\u00e3 v\u00e0 k\u1ef9 thu\u1eadt ng\u01b0\u1ee3c.<\/li>\n
  • H\u1ed7 tr\u1ee3 giao ti\u1ebfp gi\u1eefa c\u00e1c b\u00ean li\u00ean quan k\u1ef9 thu\u1eadt v\u00e0 phi k\u1ef9 thu\u1eadt.<\/li>\n
  • Ph\u00e1t hi\u1ec7n c\u00e1c khuy\u1ebft \u0111i\u1ec3m thi\u1ebft k\u1ebf ti\u1ec1m t\u00e0ng tr\u01b0\u1edbc khi tri\u1ec3n khai b\u1eaft \u0111\u1ea7u.<\/li>\n<\/ul>\n

    \ud83c\udfd7\ufe0f H\u1ed9p l\u1edbp: C\u1ea5u tr\u00fac c\u1ed1t l\u00f5i<\/h2>\n

    \u0110\u01a1n v\u1ecb x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n nh\u1ea5t c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 H\u1ed9p l\u1edbp. \u0110\u00f3 l\u00e0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ng\u0103n. M\u1ed9t h\u1ed9p l\u1edbp ti\u00eau chu\u1ea9n th\u01b0\u1eddng bao g\u1ed3m ba ph\u1ea7n: t\u00ean l\u1edbp, thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c. M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n \u0111\u1ec1u b\u1eaft bu\u1ed9c, m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ea7y \u0111\u1ee7 th\u01b0\u1eddng hi\u1ec3n th\u1ecb c\u1ea3 ba ph\u1ea7n \u0111\u1ec3 cung c\u1ea5p b\u1ed1i c\u1ea3nh \u0111\u1ea7y \u0111\u1ee7.<\/p>\n

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

    Ph\u1ea7n tr\u00ean c\u00f9ng c\u1ee7a h\u1ed9p ch\u1ee9a t\u00ean c\u1ee7a l\u1edbp. T\u00ean n\u00e0y n\u00ean l\u00e0 m\u1ed9t danh t\u1eeb ho\u1eb7c c\u1ee5m danh t\u1eeb r\u00f5 r\u00e0ng x\u00e1c \u0111\u1ecbnh th\u1ef1c th\u1ec3. C\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh d\u1ec5 \u0111\u1ecdc v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec.<\/p>\n

      \n
    • Vi\u1ebft hoa:<\/strong> T\u00ean l\u1edbp th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u b\u1eb1ng ch\u1eef hoa (v\u00ed d\u1ee5 nh\u01b0 Kh\u00e1ch h\u00e0ng<\/em>, H\u00f3a \u0111\u01a1n<\/em>).<\/li>\n
    • T\u00ednh duy nh\u1ea5t:<\/strong> T\u00ean ph\u1ea3i duy nh\u1ea5t trong kh\u00f4ng gian t\u00ean \u0111\u1ec3 tr\u00e1nh hi\u1ec3u nh\u1ea7m.<\/li>\n
    • S\u1ed1 \u00edt so v\u1edbi s\u1ed1 nhi\u1ec1u:<\/strong> S\u1eed d\u1ee5ng danh t\u1eeb s\u1ed1 \u00edt cho c\u00e1c l\u1edbp (v\u00ed d\u1ee5 nh\u01b0 S\u1ea3n ph\u1ea9m<\/em>, kh\u00f4ng ph\u1ea3i S\u1ea3n ph\u1ea9m<\/em>) \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho ki\u1ec3u, ch\u1ee9 kh\u00f4ng ph\u1ea3i t\u1eadp h\u1ee3p.<\/li>\n<\/ul>\n

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

      Ph\u1ea7n gi\u1eefa li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh. C\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i ho\u1eb7c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef b\u1edfi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp. Ch\u00fang x\u00e1c \u0111\u1ecbnh th\u00f4ng tin m\u00e0 l\u1edbp bi\u1ebft v\u1ec1 ch\u00ednh n\u00f3.<\/p>\n

      Khi t\u00e0i li\u1ec7u h\u00f3a c\u00e1c thu\u1ed9c t\u00ednh, h\u00e3y xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 sau:<\/p>\n

        \n
      • T\u00ean:<\/strong> Th\u01b0\u1eddng vi\u1ebft th\u01b0\u1eddng, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u01b0\u1edbc b\u1edfi m\u1ed9t k\u00fd hi\u1ec7u quy\u1ec1n truy c\u1eadp.<\/li>\n
      • Lo\u1ea1i:<\/strong> Ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5 nh\u01b0 Chu\u1ed7i<\/em>, S\u1ed1 nguy\u00ean<\/em>, Ng\u00e0y<\/em>).<\/li>\n
      • Gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh:<\/strong> N\u1ebfu m\u1ed9t thu\u1ed9c t\u00ednh c\u00f3 gi\u00e1 tr\u1ecb kh\u1edfi t\u1ea1o ti\u00eau chu\u1ea9n, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb (v\u00ed d\u1ee5 nh\u01b0 tr\u1ea1ng_th\u00e1i = \u201c\u0111ang ho\u1ea1t \u0111\u1ed9ng\u201d<\/em>).<\/li>\n<\/ul>\n

        V\u00ed d\u1ee5:<\/em> - t\u00ean: Chu\u1ed7i<\/code> ch\u1ec9 ra m\u1ed9t thu\u1ed9c t\u00ednh chu\u1ed7i ri\u00eang t\u01b0 c\u00f3 t\u00ean l\u00e0 t\u00ean.<\/p>\n

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

        Ph\u1ea7n d\u01b0\u1edbi li\u1ec7t k\u00ea c\u00e1c thao t\u00e1c. C\u00e1c thao t\u00e1c \u0111\u1ea1i di\u1ec7n cho h\u00e0nh vi ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 s\u1eb5n cho l\u1edbp. Ch\u00fang x\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u m\u00e0 l\u1edbp c\u00f3 th\u1ec3 l\u00e0m<\/em>.<\/p>\n

        C\u00e1c chi ti\u1ebft quan tr\u1ecdng cho thao t\u00e1c bao g\u1ed3m:<\/p>\n

          \n
        • Quy\u1ec1n truy c\u1eadp:<\/strong> C\u00e1c k\u00fd hi\u1ec7u ch\u1ec9 m\u1ee9c \u0111\u1ed9 truy c\u1eadp (+, -, #, ~).<\/li>\n
        • T\u00ean:<\/strong> Th\u01b0\u1eddng vi\u1ebft th\u01b0\u1eddng, b\u1eaft \u0111\u1ea7u b\u1eb1ng \u0111\u1ed9ng t\u1eeb (v\u00ed d\u1ee5 nh\u01b0 t\u00ednhT\u1ed5ng<\/em>).<\/li>\n
        • Tham s\u1ed1:<\/strong> C\u00e1c \u0111\u1ed1i s\u1ed1 c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1ef1c hi\u1ec7n thao t\u00e1c.<\/li>\n
        • Ki\u1ec3u tr\u1ea3 v\u1ec1:<\/strong> Ki\u1ec3u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1 sau khi thao t\u00e1c ho\u00e0n t\u1ea5t.<\/li>\n<\/ul>\n

          V\u00ed d\u1ee5:<\/em> + calculateTotal(): Integer<\/code> ch\u1ec9 ra m\u1ed9t thao t\u00e1c c\u00f4ng khai tr\u1ea3 v\u1ec1 m\u1ed9t s\u1ed1 nguy\u00ean.<\/p>\n

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

          C\u00e1c m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c l\u1edbp t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Ch\u00fang l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c h\u1ed9p l\u1edbp. Vi\u1ec7c hi\u1ec3u sai c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng l\u1ed7i ki\u1ebfn tr\u00fac nghi\u00eam tr\u1ecdng trong c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n cu\u1ed1i c\u00f9ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch chi ti\u1ebft v\u1ec1 c\u00e1c m\u1ed1i quan h\u1ec7 UML ti\u00eau chu\u1ea9n.<\/p>\n

          B\u1ea3ng so s\u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7<\/h3>\n\n\n\n\n\n\n\n\n\n\n
          Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\nT\u00ednh \u0111\u1ed1i x\u1ee9ng<\/th>\n\u00dd ngh\u0129a ng\u1eef ngh\u0129a<\/th>\nK\u00fd hi\u1ec7u<\/th>\n<\/tr>\n<\/thead>\n
          Li\u00ean k\u1ebft<\/td>\nT\u00f9y ch\u1ecdn<\/td>\nM\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n<\/td>\n<\/tr>\n
          T\u1ed5 h\u1ee3p<\/td>\nY\u1ebfu<\/td>\nM\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n (ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n to\u00e0n th\u1ec3)<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh thoi r\u1ed7ng<\/td>\n<\/tr>\n
          Th\u00e0nh ph\u1ea7n<\/td>\nM\u1ea1nh<\/td>\nM\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n (ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3)<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh thoi \u0111\u1ea7y<\/td>\n<\/tr>\n
          T\u1ed5ng qu\u00e1t h\u00f3a<\/td>\nC\u00f3<\/td>\nM\u1ed1i quan h\u1ec7 k\u1ebf th\u1eeba (l\u00e0 m\u1ed9t)<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi tam gi\u00e1c r\u1ed7ng<\/td>\n<\/tr>\n
          Ph\u1ee5 thu\u1ed9c<\/td>\nKh\u00f4ng<\/td>\nM\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng (m\u1ed9t l\u1edbp s\u1eed d\u1ee5ng l\u1edbp kh\u00e1c)<\/td>\n\u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t c\u00f3 m\u0169i t\u00ean h\u1edf<\/td>\n<\/tr>\n
          Th\u1ef1c hi\u1ec7n<\/td>\nKh\u00f4ng<\/td>\nTh\u1ef1c hi\u1ec7n m\u1ed9t giao di\u1ec7n<\/td>\n\u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t c\u00f3 tam gi\u00e1c r\u1ed7ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

          M\u1ed9t li\u00ean k\u1ebft bi\u1ec3u di\u1ec5n m\u1ed9t m\u1ed1i li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. 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 m\u1ed9t l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 c\u01a1 b\u1ea3n nh\u1ea5t.<\/p>\n

            \n
          • N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean \u0111\u1ec3 m\u00f4 t\u1ea3 b\u1ea3n ch\u1ea5t c\u1ee7a m\u1ed1i li\u00ean k\u1ebft.<\/li>\n
          • N\u00f3 c\u00f3 th\u1ec3 l\u00e0 hai chi\u1ec1u ho\u1eb7c m\u1ed9t chi\u1ec1u.<\/li>\n
          • N\u00f3 kh\u00f4ng ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu hay qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi.<\/li>\n<\/ul>\n

            T\u1ed5 h\u1ee3p<\/h3>\n

            T\u1ed5 h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u1eb7c bi\u1ec7t c\u1ee7a li\u00ean k\u1ebft. N\u00f3 bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 ‘c\u00f3-m\u1ed9t’ trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3.<\/p>\n

              \n
            • V\u00ed d\u1ee5:<\/em> M\u1ed9t tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc c\u00f3 c\u00e1c khoa. N\u1ebfu tr\u01b0\u1eddng \u0111\u00f3ng c\u1eeda, d\u1eef li\u1ec7u khoa v\u1eabn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i trong h\u1ec7 th\u1ed1ng c\u0169, ho\u1eb7c c\u00e1c khoa c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n giao.<\/li>\n
            • \u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh thoi tr\u1ed1ng \u1edf \u0111\u1ea7u ‘to\u00e0n th\u1ec3’ c\u1ee7a \u0111\u01b0\u1eddng n\u1ed1i.<\/li>\n<\/ul>\n

              Th\u00e0nh ph\u1ea7n<\/h3>\n

              Th\u00e0nh ph\u1ea7n l\u00e0 m\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a t\u1ed5 h\u1ee3p. N\u00f3 ng\u1ee5 \u00fd s\u1ef1 ph\u1ee5 thu\u1ed9c v\u1ec1 v\u00f2ng \u0111\u1eddi. 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.<\/p>\n

                \n
              • V\u00ed d\u1ee5:<\/em> M\u1ed9t ng\u00f4i nh\u00e0 c\u00f3 c\u00e1c ph\u00f2ng. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng c\u0169ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i.<\/li>\n
              • \u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh thoi \u0111\u1ea7y \u1edf \u0111\u1ea7u ‘to\u00e0n th\u1ec3’ c\u1ee7a \u0111\u01b0\u1eddng n\u1ed1i.<\/li>\n<\/ul>\n

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

                T\u1ed5ng qu\u00e1t h\u00f3a bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 ‘l\u00e0-m\u1ed9t’. N\u00f3 cho ph\u00e9p m\u1ed9t l\u1edbp k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c t\u1eeb m\u1ed9t l\u1edbp kh\u00e1c.<\/p>\n

                  \n
                • L\u1edbp con l\u00e0 phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c chuy\u00ean bi\u1ec7t h\u00f3a c\u1ee7a l\u1edbp cha.<\/li>\n
                • N\u00f3 th\u00fac \u0111\u1ea9y kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n.<\/li>\n
                • \u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n c\u00f3 tam gi\u00e1c r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha.<\/li>\n<\/ul>\n

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

                  Ph\u1ee5 thu\u1ed9c ch\u1ec9 ra r\u1eb1ng m\u1ed9t l\u1edbp s\u1eed d\u1ee5ng l\u1edbp kh\u00e1c. \u0110\u00e2y th\u01b0\u1eddng l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1ea1m th\u1eddi, ch\u1eb3ng h\u1ea1n nh\u01b0 truy\u1ec1n m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0m tham s\u1ed1 cho m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

                    \n
                  • S\u1ef1 thay \u0111\u1ed5i trong l\u1edbp cung c\u1ea5p c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn l\u1edbp ph\u1ee5 thu\u1ed9c.<\/li>\n
                  • \u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t c\u00f3 m\u0169i t\u00ean h\u1edf.<\/li>\n<\/ul>\n

                    Th\u1ef1c hi\u1ec7n (Giao di\u1ec7n)<\/h3>\n

                    Th\u1ef1c hi\u1ec7n cho th\u1ea5y r\u1eb1ng m\u1ed9t l\u1edbp tri\u1ec3n khai m\u1ed9t giao di\u1ec7n. L\u1edbp h\u1ee9a s\u1ebd cung c\u1ea5p h\u00e0nh vi \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong giao di\u1ec7n.<\/p>\n

                      \n
                    • \u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t c\u00f3 h\u00ecnh tam gi\u00e1c r\u1ed7ng.<\/li>\n
                    • Th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh \u0111a h\u00ecnh v\u00e0 t\u00e1ch bi\u1ec7t tri\u1ec3n khai kh\u1ecfi giao di\u1ec7n.<\/li>\n<\/ul>\n

                      \ud83d\udd22 \u0110a d\u1ea1ng v\u00e0 Cardinality<\/h2>\n

                      \u0110a d\u1ea1ng x\u00e1c \u0111\u1ecbnh c\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp li\u00ean quan \u0111\u1ebfn m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 chi ti\u1ebft quan tr\u1ecdng trong thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 ki\u1ec3m tra logic. \u0110a d\u1ea1ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7t g\u1ea7n hai \u0111\u1ea7u c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng li\u00ean k\u1ebft.<\/p>\n

                      C\u00e1c k\u00fd hi\u1ec7u \u0111a d\u1ea1ng ph\u1ed5 bi\u1ebfn<\/h3>\n
                        \n
                      • 1:<\/strong>Ch\u00ednh x\u00e1c 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 c\u00f3 ho\u1eb7c nhi\u1ec1u th\u1ec3 hi\u1ec7n (nhi\u1ec1u).<\/li>\n
                      • *:<\/strong>M\u1ed9t c\u00e1ch vi\u1ebft t\u1eaft cho 0..*.<\/li>\n
                      • 1..5:<\/strong>M\u1ed9t ph\u1ea1m vi c\u1ee5 th\u1ec3 c\u1ee7a c\u00e1c th\u1ec3 hi\u1ec7n.<\/li>\n<\/ul>\n

                        T\u00ecnh hu\u1ed1ng:<\/em>X\u00e9t m\u1ed9t Sinh vi\u00ean<\/em>v\u00e0 m\u1ed9t Kh\u00f3a h\u1ecdc<\/em>. M\u1ed9t Sinh vi\u00ean ph\u1ea3i \u0111\u0103ng k\u00fd \u00edt nh\u1ea5t m\u1ed9t Kh\u00f3a h\u1ecdc (1..*), nh\u01b0ng m\u1ed9t Kh\u00f3a h\u1ecdc c\u00f3 th\u1ec3 kh\u00f4ng c\u00f3 sinh vi\u00ean n\u00e0o (0..*). \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1ch \u0111\u1eb7t \u201c1..*\u201d b\u00ean c\u1ea1nh Kh\u00f3a h\u1ecdc \u1edf ph\u00eda Sinh vi\u00ean v\u00e0 \u201c0..*\u201d b\u00ean c\u1ea1nh Sinh vi\u00ean \u1edf ph\u00eda Kh\u00f3a h\u1ecdc.<\/p>\n

                        \ud83c\udfa8 C\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng<\/h2>\n

                        T\u00ednh kh\u1ea3 d\u1ee5ng x\u00e1c \u0111\u1ecbnh ph\u1ea7n n\u00e0o c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb c\u00e1c l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong \u0111\u00f3ng g\u00f3i. C\u00e1c k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u1ea7u t\u00ean thu\u1ed9c t\u00ednh ho\u1eb7c thao t\u00e1c.<\/p>\n

                          \n
                        • C\u00f4ng khai (+):<\/strong>C\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o kh\u00e1c. \u0110\u00e2y l\u00e0 m\u1ee9c truy c\u1eadp m\u1edf r\u1ed9ng nh\u1ea5t.<\/li>\n
                        • Ri\u00eang t\u01b0 (-):<\/strong> Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u00ean trong ch\u00ednh l\u1edbp \u0111\u00f3. \u0110i\u1ec1u n\u00e0y b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u n\u1ed9i b\u1ed9.<\/li>\n
                        • B\u1ea3o v\u1ec7 (#):<\/strong> C\u00f3 th\u1ec3 truy c\u1eadp trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con c\u1ee7a n\u00f3. Th\u01b0\u1eddng g\u1eb7p trong c\u00e1c c\u1ea5u tr\u00fac k\u1ebf th\u1eeba.<\/li>\n
                        • G\u00f3i (~):<\/strong> Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp trong c\u00f9ng m\u1ed9t g\u00f3i ho\u1eb7c kh\u00f4ng gian t\u00ean.<\/li>\n<\/ul>\n

                          Ch\u1ecdn \u0111\u1ed9 kh\u1ea3 d\u1ee5ng ph\u00f9 h\u1ee3p l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a tr\u1ea1ng th\u00e1i \u0111\u1ed1i t\u01b0\u1ee3ng. Vi\u1ec7c l\u1ea1m d\u1ee5ng truy c\u1eadp c\u00f4ng khai c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd v\u00e0 m\u00e3 ngu\u1ed3n d\u1ec5 b\u1ecb l\u1ed7i.<\/p>\n

                          \ud83d\udcdd C\u00e1c ki\u1ec3u d\u00e1ng v\u00e0 r\u00e0ng bu\u1ed9c<\/h2>\n

                          Ngo\u00e0i c\u00e1c ph\u1ea7n t\u1eed ti\u00eau chu\u1ea9n, UML cho ph\u00e9p m\u1edf r\u1ed9ng th\u00f4ng qua c\u00e1c ki\u1ec3u d\u00e1ng v\u00e0 r\u00e0ng bu\u1ed9c. Ch\u00fang th\u00eam \u00fd ngh\u0129a ng\u1eef ngh\u0129a m\u00e0 kh\u00f4ng thay \u0111\u1ed5i c\u1ea5u tr\u00fac h\u00ecnh \u1ea3nh.<\/p>\n

                          C\u00e1c ki\u1ec3u d\u00e1ng<\/h3>\n

                          M\u1ed9t ki\u1ec3u d\u00e1ng l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf \u0111\u1ec3 t\u1ea1o ra c\u00e1c lo\u1ea1i ph\u1ea7n t\u1eed m\u1edbi. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u00f3ng trong d\u1ea5u ngo\u1eb7c k\u00e9p (v\u00ed d\u1ee5: <<ki\u1ec3u d\u00e1ng>>).<\/p>\n

                            \n
                          • V\u00ed d\u1ee5:<\/strong> <<Interface>> cho bi\u1ebft m\u1ed9t l\u1edbp \u0111\u1ecbnh ngh\u0129a m\u1ed9t giao di\u1ec7n.<\/li>\n
                          • V\u00ed d\u1ee5:<\/strong> <<Entity>> c\u00f3 th\u1ec3 ch\u1ec9 ra vi\u1ec7c \u00e1nh x\u1ea1 m\u1ed9t b\u1ea3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
                          • V\u00ed d\u1ee5:<\/strong> <<Abstract>> cho bi\u1ebft m\u1ed9t l\u1edbp kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o tr\u1ef1c ti\u1ebfp.<\/li>\n<\/ul>\n

                            C\u00e1c r\u00e0ng bu\u1ed9c<\/h3>\n

                            C\u00e1c r\u00e0ng bu\u1ed9c l\u00e0 nh\u1eefng \u0111i\u1ec1u ki\u1ec7n m\u00e0 h\u1ec7 th\u1ed1ng ph\u1ea3i \u0111\u00e1p \u1ee9ng. Ch\u00fang \u0111\u01b0\u1ee3c \u0111\u00f3ng trong d\u1ea5u ngo\u1eb7c nh\u1ecdn (v\u00ed d\u1ee5: {r\u00e0ng bu\u1ed9c}).<\/p>\n

                              \n
                            • V\u00ed d\u1ee5:<\/strong> {unique} tr\u00ean m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 b\u1ea3n sao tr\u00f9ng l\u1eb7p.<\/li>\n
                            • V\u00ed d\u1ee5:<\/strong> {readOnly} tr\u00ean m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u1ea3m b\u1ea3o n\u00f3 kh\u00f4ng th\u1ec3 b\u1ecb thay \u0111\u1ed5i.<\/li>\n
                            • V\u00ed d\u1ee5:<\/strong> {pre: age >= 18} tr\u00ean m\u1ed9t thao t\u00e1c \u0111\u1ea3m b\u1ea3o logic v\u1eabn \u0111\u00fang.<\/li>\n<\/ul>\n

                              \ud83d\udee0\ufe0f C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho thi\u1ebft k\u1ebf<\/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; \u0111\u00f3 l\u00e0 v\u1ec1 vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a logic m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. Tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 v\u1eabn h\u1eefu \u00edch theo th\u1eddi gian.<\/p>\n

                              Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean<\/h3>\n
                                \n
                              • S\u1eed d\u1ee5ng t\u00ean r\u00f5 r\u00e0ng, m\u00f4 t\u1ea3 ch\u00ednh x\u00e1c.<\/li>\n
                              • Tr\u00e1nh d\u00f9ng vi\u1ebft t\u1eaft tr\u1eeb khi ch\u00fang l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh.<\/li>\n
                              • \u0110\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n tr\u00ean to\u00e0n b\u1ed9 s\u01a1 \u0111\u1ed3.<\/li>\n<\/ul>\n

                                \u0110\u01a1n gi\u1ea3n<\/h3>\n
                                  \n
                                • Tr\u00e1nh hi\u1ec3n th\u1ecb t\u1eebng thu\u1ed9c t\u00ednh ri\u00eang l\u1ebb trong s\u01a1 \u0111\u1ed3. T\u1eadp trung v\u00e0o nh\u1eefng thu\u1ed9c t\u00ednh thi\u1ebft y\u1ebfu.<\/li>\n
                                • \u0110\u1eebng l\u00e0m r\u1ed1i s\u01a1 \u0111\u1ed3 b\u1eb1ng c\u00e1c thao t\u00e1c \u0111\u01a1n gi\u1ea3n.<\/li>\n
                                • S\u1eed d\u1ee5ng k\u1ebf th\u1eeba m\u1ed9t c\u00e1ch kh\u00f4n kh\u00e9o. C\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u c\u00f3 th\u1ec3 tr\u1edf n\u00ean kh\u00f3 qu\u1ea3n l\u00fd.<\/li>\n<\/ul>\n

                                  T\u00ednh nh\u1ea5t qu\u00e1n<\/h3>\n
                                    \n
                                  • \u0110\u1ea3m b\u1ea3o c\u00e1c m\u1ed1i quan h\u1ec7 nh\u1ea5t qu\u00e1n. N\u1ebfu A li\u00ean k\u1ebft v\u1edbi B, h\u01b0\u1edbng li\u00ean k\u1ebft ph\u1ea3i r\u00f5 r\u00e0ng.<\/li>\n
                                  • Duy tr\u00ec c\u00f9ng m\u1ed9t phong c\u00e1ch cho c\u00e1c k\u00fd hi\u1ec7u quy\u1ec1n truy c\u1eadp trong su\u1ed1t s\u01a1 \u0111\u1ed3.<\/li>\n
                                  • Gi\u1eef m\u1ed1i quan h\u1ec7 s\u1ed1 l\u01b0\u1ee3ng nh\u1ea5t qu\u00e1n v\u1edbi c\u00e1c quy t\u1eafc kinh doanh.<\/li>\n<\/ul>\n

                                    \u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

                                    Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 m\u1eafc sai l\u1ea7m. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 s\u1ea1ch s\u1ebd h\u01a1n.<\/p>\n

                                      \n
                                    • Ph\u1ee5 thu\u1ed9c v\u00f2ng l\u1eb7p:<\/strong>Tr\u00e1nh c\u00e1c v\u00f2ng l\u1eb7p n\u01a1i Class A ph\u1ee5 thu\u1ed9c v\u00e0o Class B, m\u00e0 Class B l\u1ea1i ph\u1ee5 thu\u1ed9c v\u00e0o Class A. \u0110i\u1ec1u n\u00e0y g\u00e2y ra v\u1ea5n \u0111\u1ec1 bi\u00ean d\u1ecbch trong nhi\u1ec1u ng\u00f4n ng\u1eef.<\/li>\n
                                    • Nh\u1ea7m l\u1eabn gi\u1eefa t\u00edch h\u1ee3p v\u00e0 k\u1ebft h\u1ee3p:<\/strong>Ch\u00fang th\u01b0\u1eddng b\u1ecb nh\u1ea7m l\u1eabn. H\u00e3y nh\u1edb: K\u1ebft h\u1ee3p ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu v\u00e0 v\u00f2ng \u0111\u1eddi.<\/li>\n
                                    • Qu\u00e1 m\u1ee9c thi\u1ebft k\u1ebf:<\/strong>\u0110\u1eebng m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi chi ti\u1ebft c\u1ee7a h\u1ec7 th\u1ed1ng trong m\u1ed9t s\u01a1 \u0111\u1ed3. Chia h\u1ec7 th\u1ed1ng l\u1edbn th\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng con.<\/li>\n
                                    • B\u1ecf qua quy\u1ec1n truy c\u1eadp:<\/strong>Ch\u1ec9 hi\u1ec3n th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh ri\u00eang t\u01b0 c\u00f3 th\u1ec3 che gi\u1ea5u c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u quan tr\u1ecdng, trong khi ch\u1ec9 hi\u1ec3n th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh c\u00f4ng khai c\u00f3 th\u1ec3 l\u00e0m l\u1ed9 r\u1ee7i ro b\u1ea3o m\u1eadt.<\/li>\n
                                    • S\u1eed d\u1ee5ng sai kh\u00e1i qu\u00e1t h\u00f3a:<\/strong>Kh\u00f4ng ph\u1ea3i m\u1ed1i quan h\u1ec7 n\u00e0o c\u00f3 \u201cc\u00f3-m\u1ed9t\u201d c\u0169ng l\u00e0 k\u1ebf th\u1eeba. K\u1ebf th\u1eeba ch\u1ec9 l\u00e0 \u201cl\u00e0-m\u1ed9t\u201d.<\/li>\n<\/ul>\n

                                      \ud83d\udcc8 \u1ee8ng d\u1ee5ng trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n<\/h2>\n

                                      S\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng ph\u1ea3i l\u00e0 t\u00e0i li\u1ec7u t\u0129nh; ch\u00fang thay \u0111\u1ed5i theo ti\u1ebfn tr\u00ecnh d\u1ef1 \u00e1n.<\/p>\n

                                      Giai \u0111o\u1ea1n ph\u00e2n t\u00edch<\/h3>\n

                                      Trong giai \u0111o\u1ea1n ph\u00e2n t\u00edch, s\u01a1 \u0111\u1ed3 l\u1edbp t\u1eadp trung v\u00e0o c\u00e1c kh\u00e1i ni\u1ec7m kinh doanh. Ch\u00fang kh\u00f4ng c\u1ea7n ho\u00e0n h\u1ea3o v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt nh\u01b0ng ph\u1ea3i ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c logic l\u0129nh v\u1ef1c.<\/p>\n

                                      Giai \u0111o\u1ea1n thi\u1ebft k\u1ebf<\/h3>\n

                                      Trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf, c\u00e1c chi ti\u1ebft k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c th\u00eam v\u00e0o. Quy\u1ec1n truy c\u1eadp, ki\u1ec3u d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. \u0110\u00e2y l\u00e0 phi\u00ean b\u1ea3n m\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n s\u1eed d\u1ee5ng \u0111\u1ec3 vi\u1ebft m\u00e3.<\/p>\n

                                      Giai \u0111o\u1ea1n b\u1ea3o tr\u00ec<\/h3>\n

                                      Khi c\u00f3 thay \u0111\u1ed5i x\u1ea3y ra, s\u01a1 \u0111\u1ed3 ph\u1ea3i \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1ed7i th\u1eddi c\u00f2n t\u1ec7 h\u01a1n c\u1ea3 kh\u00f4ng c\u00f3 s\u01a1 \u0111\u1ed3, v\u00ec n\u00f3 g\u00e2y hi\u1ec3u l\u1ea7m cho nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 d\u1eabn \u0111\u1ebfn n\u1ee3 k\u1ef9 thu\u1eadt.<\/p>\n

                                      \ud83e\udde9 Nh\u1eefng c\u00e2n nh\u1eafc n\u00e2ng cao<\/h2>\n

                                      \u0110\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p, s\u01a1 \u0111\u1ed3 l\u1edbp chu\u1ea9n c\u00f3 th\u1ec3 c\u1ea7n \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng.<\/p>\n

                                        \n
                                      • Giao di\u1ec7n:<\/strong>S\u1eed d\u1ee5ng giao di\u1ec7n cho ph\u00e9p k\u1ebft n\u1ed1i l\u1ecfng l\u1ebbo. C\u00e1c l\u1edbp tri\u1ec3n khai giao di\u1ec7n, cho ph\u00e9p thay \u0111\u1ed5i tri\u1ec3n khai m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u00e1ch h\u00e0ng.<\/li>\n
                                      • L\u1edbp tr\u1eebu t\u01b0\u1ee3ng:<\/strong> Ch\u00fang \u0111\u1ecbnh ngh\u0129a m\u1ed9t giao di\u1ec7n chung nh\u01b0ng kh\u00f4ng th\u1ec3 kh\u1edfi t\u1ea1o. Ch\u00fang h\u1eefu \u00edch \u0111\u1ec3 nh\u00f3m c\u00e1c h\u00e0nh vi chung.<\/li>\n
                                      • L\u1edbp li\u00ean k\u1ebft:<\/strong> Khi m\u1ed9t m\u1ed1i quan h\u1ec7 b\u1ea3n th\u00e2n c\u00f3 thu\u1ed9c t\u00ednh ho\u1eb7c thao t\u00e1c, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a nh\u01b0 m\u1ed9t l\u1edbp li\u00ean k\u1ebft. \u0110i\u1ec1u n\u00e0y ph\u1ed5 bi\u1ebfn trong c\u00e1c m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111a.<\/li>\n<\/ul>\n

                                        \ud83d\udccc T\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd<\/h2>\n

                                        Th\u00e0nh th\u1ea1o c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp UML \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft v\u00e0 hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean t\u1eafc h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. T\u1eeb h\u1ed9p l\u1edbp c\u01a1 b\u1ea3n \u0111\u1ebfn c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p nh\u01b0 k\u1ebft h\u1ee3p v\u00e0 t\u1ed5ng qu\u00e1t h\u00f3a, m\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u \u0111\u00f3ng vai tr\u00f2 c\u1ee5 th\u1ec3 trong vi\u1ec7c \u0111\u1ecbnh ngh\u0129a ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng.<\/p>\n

                                          \n
                                        • H\u1ed9p l\u1edbp:<\/strong> X\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac v\u1edbi t\u00ean, thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c.<\/li>\n
                                        • M\u1ed1i quan h\u1ec7:<\/strong> X\u00e1c \u0111\u1ecbnh t\u01b0\u01a1ng t\u00e1c th\u00f4ng qua li\u00ean k\u1ebft, t\u1ed5ng h\u1ee3p, k\u1ebft h\u1ee3p, k\u1ebf th\u1eeba, ph\u1ee5 thu\u1ed9c v\u00e0 th\u1ef1c hi\u1ec7n.<\/li>\n
                                        • \u0110a d\u1ea1ng:<\/strong> X\u00e1c \u0111\u1ecbnh t\u00ednh cardinality v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c tr\u00ean m\u1ed1i quan h\u1ec7.<\/li>\n
                                        • \u0110\u1ed9 kh\u1ea3 ki\u1ebfn:<\/strong> Ki\u1ec3m so\u00e1t quy\u1ec1n truy c\u1eadp v\u00e0o d\u1eef li\u1ec7u v\u00e0 h\u00e0nh vi.<\/li>\n
                                        • C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t:<\/strong>\u01afu ti\u00ean s\u1ef1 r\u00f5 r\u00e0ng, nh\u1ea5t qu\u00e1n v\u00e0 ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n

                                          B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y, c\u00e1c \u0111\u1ed9i nh\u00f3m c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m m\u1ea1nh m\u1ebd, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 m\u1edf r\u1ed9ng. S\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t ng\u00f4n ng\u1eef chung, n\u1ed1i li\u1ec1n kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng v\u00e0 tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"excerpt":{"rendered":"

                                          Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng cho thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Trong s\u1ed1 c\u00e1c lo\u1ea1i s\u01a1 \u0111\u1ed3 kh\u00e1c nhau, s\u01a1…<\/p>\n","protected":false},"author":1,"featured_media":120,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"C\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp UML: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n \ud83d\udcca","_yoast_wpseo_metadesc":"H\u1ecdc t\u1eebng th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp UML. Kh\u00e1m ph\u00e1 c\u00e1c m\u1ed1i quan h\u1ec7, thu\u1ed9c t\u00ednh v\u00e0 c\u1ea5u tr\u00fac \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng hi\u1ec7u qu\u1ea3.","inline_featured_image":false,"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[4],"tags":[5,7],"class_list":["post-119","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uml","tag-academic","tag-class-diagram"],"yoast_head":"\nC\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp UML: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n \ud83d\udcca<\/title>\n<meta name=\"description\" content=\"H\u1ecdc t\u1eebng th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp UML. 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