{"id":366,"date":"2026-03-27T03:28:40","date_gmt":"2026-03-27T03:28:40","guid":{"rendered":"https:\/\/www.go-minder.com\/vi\/how-to-read-uml-diagrams-guide\/"},"modified":"2026-03-27T03:28:40","modified_gmt":"2026-03-27T03:28:40","slug":"how-to-read-uml-diagrams-guide","status":"publish","type":"post","link":"https:\/\/www.go-minder.com\/vi\/how-to-read-uml-diagrams-guide\/","title":{"rendered":"C\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 UML: H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc cho sinh vi\u00ean v\u00e0 nh\u00e2n vi\u00ean m\u1edbi"},"content":{"rendered":"

Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 UML, \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd ti\u00eau chu\u1ea9n cho ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m. D\u00f9 b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng doanh nghi\u1ec7p ph\u1ee9c t\u1ea1p hay m\u1ed9t \u1ee9ng d\u1ee5ng web \u0111\u01a1n gi\u1ea3n, vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 giao ti\u1ebfp r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n, b\u00ean li\u00ean quan v\u00e0 nh\u00e0 thi\u1ebft k\u1ebf. \u0110\u1ed1i v\u1edbi sinh vi\u00ean v\u00e0 k\u1ef9 s\u01b0 m\u1edbi, kh\u1ea3 n\u0103ng di\u1ec5n gi\u1ea3i c\u00e1c bi\u1ec3u di\u1ec5n h\u00ecnh \u1ea3nh n\u00e0y c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u00e1ng k\u1ec3 sai s\u00f3t trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n v\u00e0 l\u00e0m cho quy tr\u00ecnh thi\u1ebft k\u1ebf tr\u1edf n\u00ean tr\u01a1n tru h\u01a1n.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y ph\u00e2n t\u00edch chi ti\u1ebft c\u00e1c c\u01a1 ch\u1ebf c\u1ee7a k\u00fd hi\u1ec7u UML, t\u1eadp trung v\u00e0o k\u1ef9 n\u0103ng \u0111\u1ecdc th\u1ef1c t\u1ebf thay v\u00ec l\u00fd thuy\u1ebft tr\u1eebu t\u01b0\u1ee3ng. B\u1ea1n s\u1ebd h\u1ecdc c\u00e1ch nh\u1eadn di\u1ec7n c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh, hi\u1ec3u \u0111\u01b0\u1ee3c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n v\u00e0 di\u1ec5n gi\u1ea3i lu\u1ed3ng logic b\u00ean trong m\u1ed9t h\u1ec7 th\u1ed1ng. \u0110\u1ebfn cu\u1ed1i b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc \u0111\u1ec3 ph\u00e2n t\u00edch b\u1ea5t k\u1ef3 s\u01a1 \u0111\u1ed3 UML ti\u00eau chu\u1ea9n n\u00e0o b\u1ea1n g\u1eb7p trong t\u00e0i li\u1ec7u ho\u1eb7c trong qu\u00e1 tr\u00ecnh xem x\u00e9t m\u00e3 ngu\u1ed3n.<\/p>\n

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

Hi\u1ec3u n\u1ec1n t\u1ea3ng: L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1<\/h2>\n

Tr\u01b0\u1edbc khi \u0111i v\u00e0o c\u00e1c lo\u1ea1i s\u01a1 \u0111\u1ed3 c\u1ee5 th\u1ec3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i n\u1eafm v\u1eefng c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n. H\u1ea7u h\u1ebft c\u00e1c s\u01a1 \u0111\u1ed3 UML \u0111\u1ec1u d\u1ef1a tr\u00ean kh\u00e1i ni\u1ec7m v\u1ec1 m\u1ed9t L\u1edbp<\/strong> v\u00e0 m\u1ed9t \u0110\u1ed1i t\u01b0\u1ee3ng<\/strong>. Vi\u1ec7c nh\u1ea7m l\u1eabn hai kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u.<\/p>\n

    \n
  • L\u1edbp:<\/strong> \u0110\u00e2y l\u00e0 b\u1ea3n v\u1ebd ho\u1eb7c m\u1eabu. N\u00f3 \u0111\u1ecbnh ngh\u0129a c\u1ea5u tr\u00fac, thu\u1ed9c t\u00ednh (d\u1eef li\u1ec7u) v\u00e0 h\u00e0nh vi (ph\u01b0\u01a1ng th\u1ee9c) m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thu\u1ed9c lo\u1ea1i \u0111\u00f3 s\u1ebd c\u00f3. N\u00f3 mang t\u00ednh tr\u1eebu t\u01b0\u1ee3ng v\u00e0 t\u1ed3n t\u1ea1i \u1edf giai \u0111o\u1ea1n thi\u1ebft k\u1ebf.<\/li>\n
  • \u0110\u1ed1i t\u01b0\u1ee3ng:<\/strong> \u0110\u00e2y l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n th\u1ef1c t\u1ebf c\u1ee7a m\u1ed9t l\u1edbp. N\u00f3 t\u1ed3n t\u1ea1i trong b\u1ed9 nh\u1edb t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 l\u01b0u tr\u1eef c\u00e1c gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3 cho c\u00e1c thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi l\u1edbp.<\/li>\n<\/ul>\n

    Khi b\u1ea1n th\u1ea5y m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng ngang d\u00e0y chia th\u00e0nh ba ph\u1ea7n: tr\u00ean, gi\u1eefa v\u00e0 d\u01b0\u1edbi, th\u00ec kh\u1ea3 n\u0103ng cao b\u1ea1n \u0111ang nh\u00ecn v\u00e0o m\u1ed9t L\u1edbp. Ph\u1ea7n tr\u00ean ch\u1ee9a t\u00ean l\u1edbp, ph\u1ea7n gi\u1eefa li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh, ph\u1ea7n d\u01b0\u1edbi li\u1ec7t k\u00ea c\u00e1c ph\u01b0\u01a1ng th\u1ee9c. Vi\u1ec7c nh\u1eadn di\u1ec7n c\u1ea5u tr\u00fac n\u00e0y gi\u00fap b\u1ea1n nhanh ch\u00f3ng tr\u00edch xu\u1ea5t th\u00f4ng tin v\u1ec1 m\u00f4 h\u00ecnh d\u1eef li\u1ec7u c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

    Hai th\u1ec3 lo\u1ea1i ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3 UML \ud83d\uddc2\ufe0f<\/h2>\n

    C\u00e1c s\u01a1 \u0111\u1ed3 UML th\u01b0\u1eddng \u0111\u01b0\u1ee3c chia th\u00e0nh hai th\u1ec3 lo\u1ea1i r\u1ed9ng l\u1edbn: C\u1ea5u tr\u00fac v\u00e0 H\u00e0nh vi. Bi\u1ebft s\u01a1 \u0111\u1ed3 thu\u1ed9c th\u1ec3 lo\u1ea1i n\u00e0o s\u1ebd gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh kh\u00eda c\u1ea1nh n\u00e0o c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ea1n \u0111ang xem.<\/p>\n

    1. S\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac \ud83d\udd28<\/h3>\n

    C\u00e1c s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac th\u1ec3 hi\u1ec7n kh\u00eda c\u1ea1nh t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Ch\u00fang m\u00f4 t\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n v\u1eadt l\u00fd ho\u1eb7c logic t\u1ea1o n\u00ean ph\u1ea7n m\u1ec1m v\u00e0 c\u00e1ch ch\u00fang li\u00ean k\u1ebft v\u1edbi nhau. H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng ch\u00fang nh\u01b0 b\u1ea3n v\u1ebd ki\u1ebfn tr\u00fac c\u1ee7a m\u1ed9t ng\u00f4i nh\u00e0; ch\u00fang th\u1ec3 hi\u1ec7n c\u00e1c ph\u00f2ng, t\u01b0\u1eddng v\u00e0 n\u1ec1n m\u00f3ng, nh\u01b0ng kh\u00f4ng th\u1ec3 hi\u1ec7n c\u00e1ch con ng\u01b0\u1eddi di chuy\u1ec3n trong nh\u00e0.<\/p>\n

      \n
    • S\u01a1 \u0111\u1ed3 l\u1edbp:<\/strong> S\u01a1 \u0111\u1ed3 ph\u1ed5 bi\u1ebfn nh\u1ea5t. N\u00f3 th\u1ec3 hi\u1ec7n c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1ed1i quan h\u1ec7.<\/li>\n
    • S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> M\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p nhanh c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3, th\u1ec3 hi\u1ec7n c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a c\u00e1c l\u1edbp.<\/li>\n
    • S\u01a1 \u0111\u1ed3 th\u00e0nh ph\u1ea7n:<\/strong> \u0110\u1ea1i di\u1ec7n cho t\u1ed5 ch\u1ee9c c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea7n m\u1ec1m c\u1ea5p cao.<\/li>\n
    • S\u01a1 \u0111\u1ed3 tri\u1ec3n khai:<\/strong> Minh h\u1ecda c\u00e1c n\u00fat ph\u1ea7n c\u1ee9ng v\u1eadt l\u00fd v\u00e0 c\u00e1ch ph\u1ea7n m\u1ec1m \u0111\u01b0\u1ee3c tri\u1ec3n khai tr\u00ean ch\u00fang.<\/li>\n<\/ul>\n

      2. S\u01a1 \u0111\u1ed3 h\u00e0nh vi \ud83d\udd04<\/h3>\n

      C\u00e1c s\u01a1 \u0111\u1ed3 h\u00e0nh vi m\u00f4 t\u1ea3 c\u00e1c kh\u00eda c\u1ea1nh \u0111\u1ed9ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Ch\u00fang t\u1eadp trung v\u00e0o c\u00e1ch h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng theo th\u1eddi gian, c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n v\u00e0 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c trong qu\u00e1 tr\u00ecnh th\u1ef1c thi. Ch\u00fang gi\u1ed1ng nh\u01b0 k\u1ecbch b\u1ea3n c\u1ee7a m\u1ed9t b\u1ed9 phim; ch\u00fang th\u1ec3 hi\u1ec7n h\u00e0nh \u0111\u1ed9ng v\u00e0 l\u1eddi tho\u1ea1i, nh\u01b0ng kh\u00f4ng th\u1ec3 hi\u1ec7n thi\u1ebft k\u1ebf s\u00e2n kh\u1ea5u.<\/p>\n

        \n
      • S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng:<\/strong> Th\u1ec3 hi\u1ec7n c\u00e1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa ng\u01b0\u1eddi d\u00f9ng (ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n) v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
      • S\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1:<\/strong>Chi ti\u1ebft v\u1ec1 th\u1ee9 t\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian.<\/li>\n
      • S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng:<\/strong>Gi\u1ed1ng nh\u01b0 s\u01a1 \u0111\u1ed3 lu\u1ed3ng, th\u1ec3 hi\u1ec7n lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb ho\u1ea1t \u0111\u1ed9ng n\u00e0y sang ho\u1ea1t \u0111\u1ed9ng kh\u00e1c.<\/li>\n
      • S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i:<\/strong>M\u00f4 t\u1ea3 c\u00e1c tr\u1ea1ng th\u00e1i kh\u00e1c nhau m\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 \u1edf v\u00e0 c\u00e1c chuy\u1ec3n ti\u1ebfp gi\u1eefa ch\u00fang.<\/li>\n<\/ul>\n

        Kh\u00e1m ph\u00e1 s\u00e2u: S\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac \ud83d\udd28<\/h2>\n

        S\u01a1 \u0111\u1ed3 l\u1edbp<\/h3>\n

        S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Khi \u0111\u1ecdc m\u1ed9t s\u01a1 \u0111\u1ed3, h\u00e3y t\u1eadp trung v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 sau:<\/p>\n

          \n
        • C\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng:<\/strong>C\u00e1c k\u00fd hi\u1ec7u \u0111\u1eb7t tr\u01b0\u1edbc t\u00ean thu\u1ed9c t\u00ednh ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c cho bi\u1ebft m\u1ee9c \u0111\u1ed9 truy c\u1eadp.<\/li>\n
            \n
          • +<\/strong>: C\u00f4ng khai (c\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u).<\/li>\n
          • \u2013<\/strong>: Ri\u00eang t\u01b0 (ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u00ean trong l\u1edbp).<\/li>\n
          • #<\/strong>: B\u1ea3o v\u1ec7 (c\u00f3 th\u1ec3 truy c\u1eadp trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con).<\/li>\n
          • ~<\/strong>: Ri\u00eang t\u01b0 g\u00f3i (c\u00f3 th\u1ec3 truy c\u1eadp trong c\u00f9ng m\u1ed9t g\u00f3i).<\/li>\n<\/ul>\n
          • Th\u00e0nh vi\u00ean t\u0129nh:<\/strong>D\u1ea5u g\u1ea1ch d\u01b0\u1edbi (“_”) \u0111\u1eb7t tr\u01b0\u1edbc t\u00ean cho bi\u1ebft th\u00e0nh vi\u00ean t\u0129nh, thu\u1ed9c v\u1ec1 l\u1edbp ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t th\u1ec3 hi\u1ec7n.D\u1ea5u g\u1ea1ch d\u01b0\u1edbi (“_”) \u0111\u1eb7t tr\u01b0\u1edbc t\u00ean cho bi\u1ebft th\u00e0nh vi\u00ean t\u0129nh, thu\u1ed9c v\u1ec1 l\u1edbp ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t th\u1ec3 hi\u1ec7n.<\/u><\/li>\n
          • S\u1ed1 l\u01b0\u1ee3ng:<\/strong>C\u00e1c con s\u1ed1 ho\u1eb7c d\u1ea5u sao g\u1ea7n c\u00e1c \u0111\u01b0\u1eddng quan h\u1ec7 cho bi\u1ebft c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i bao nhi\u00eau th\u1ec3 hi\u1ec7n. V\u00ed d\u1ee5, 1<\/code> c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t, 0..1<\/code> c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng ho\u1eb7c m\u1ed9t, v\u00e0 *<\/code> c\u00f3 ngh\u0129a l\u00e0 nhi\u1ec1u.<\/li>\n<\/ul>\n

            S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

            S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p nhanh c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp. N\u00f3 hi\u1ec3n th\u1ecb c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 c\u00f9ng v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb tr\u1ea1ng th\u00e1i hi\u1ec7n t\u1ea1i c\u1ee7a ch\u00fang. Khi \u0111\u1ecdc, h\u00e3y t\u00ecm \u0111\u01b0\u1eddng g\u1ea1ch d\u01b0\u1edbi k\u00e9p d\u01b0\u1edbi t\u00ean l\u1edbp trong nh\u00e3n \u0111\u1ed1i t\u01b0\u1ee3ng (v\u00ed d\u1ee5 nh\u01b0 “T\u00e0i kho\u1ea3n: #12345<\/code>“). \u0110i\u1ec1u n\u00e0y ph\u00e2n bi\u1ec7t n\u00f3 v\u1edbi \u0111\u1ecbnh ngh\u0129a l\u1edbp. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y h\u1eefu \u00edch cho vi\u1ec7c g\u1ee1 l\u1ed7i ho\u1eb7c hi\u1ec3u tr\u1ea1ng th\u00e1i th\u1eddi gian ch\u1ea1y c\u1ee7a c\u00e1c t\u01b0\u01a1ng t\u00e1c ph\u1ee9c t\u1ea1p.<\/p>\n

            S\u01a1 \u0111\u1ed3 th\u00e0nh ph\u1ea7n<\/h3>\n

            S\u01a1 \u0111\u1ed3 th\u00e0nh ph\u1ea7n \u1edf c\u1ea5p \u0111\u1ed9 cao h\u01a1n s\u01a1 \u0111\u1ed3 l\u1edbp. Ch\u00fang nh\u00f3m c\u00e1c l\u1edbp th\u00e0nh c\u00e1c m\u00f4-\u0111un ho\u1eb7c th\u01b0 vi\u1ec7n. M\u1ed9t th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai h\u00ecnh ch\u1eef nh\u1eadt nh\u1ecf h\u01a1n \u1edf ph\u00eda b\u00ean tr\u00e1i. Khi \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, h\u00e3y t\u00ecm c\u00e1c giao di\u1ec7n cung c\u1ea5p (h\u00ecnh d\u1ea1ng que k\u1eb9o) v\u00e0 y\u00eau c\u1ea7u (h\u00ecnh d\u1ea1ng \u1ed5 c\u1eafm) \u0111\u1ec3 hi\u1ec3u c\u00e1c m\u1ed1i ph\u1ee5 thu\u1ed9c gi\u1eefa c\u00e1c m\u00f4-\u0111un.<\/p>\n

            Kh\u00e1m ph\u00e1 s\u00e2u: S\u01a1 \u0111\u1ed3 h\u00e0nh vi \ud83d\udd04<\/h2>\n

            S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/h3>\n

            S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1eadp trung v\u00e0o g\u00f3c nh\u00ecn c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Ch\u00fang tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: \u201cH\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 l\u00e0m g\u00ec?\u201d<\/p>\n

              \n
            • Ng\u01b0\u1eddi d\u00f9ng (Actors):<\/strong>C\u00e1c h\u00ecnh ng\u01b0\u1eddi \u0111\u01a1n gi\u1ea3n \u0111\u1ea1i di\u1ec7n cho ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c c\u00e1c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i t\u01b0\u01a1ng t\u00e1c v\u1edbi ph\u1ea7n m\u1ec1m.<\/li>\n
            • Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng (Use Cases):<\/strong>C\u00e1c h\u00ecnh elip \u0111\u1ea1i di\u1ec7n cho c\u00e1c ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: \u201c\u0110\u0103ng nh\u1eadp\u201d, \u201cT\u1ea1o b\u00e1o c\u00e1o\u201d).<\/li>\n
            • M\u1ed1i quan h\u1ec7:<\/strong>C\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng. C\u00e1c m\u1ed1i quan h\u1ec7 b\u1ed5 sung bao g\u1ed3m include<\/code> (h\u00e0nh vi b\u1eaft bu\u1ed9c) v\u00e0 extend<\/code> (h\u00e0nh vi t\u00f9y ch\u1ecdn).<\/li>\n<\/ul>\n

              S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/h3>\n

              S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u lu\u1ed3ng logic. Ch\u00fang d\u1ef1a tr\u00ean th\u1eddi gian, \u0111\u01b0\u1ee3c \u0111\u1ecdc t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi.<\/p>\n

                \n
              • D\u00e2y s\u1ed1ng (Lifelines):<\/strong>C\u00e1c \u0111\u01b0\u1eddng \u0111\u1ee9t n\u00e9t d\u1ecdc \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c ng\u01b0\u1eddi tham gia. \u0110\u1ea7u tr\u00ean c\u1ee7a \u0111\u01b0\u1eddng l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u1ea7u d\u01b0\u1edbi ch\u1ec9 s\u1ef1 tr\u00f4i qua c\u1ee7a th\u1eddi gian.<\/li>\n
              • Thanh k\u00edch ho\u1ea1t (Activation Bars):<\/strong>C\u00e1c h\u00ecnh ch\u1eef nh\u1eadt m\u1ecfng tr\u00ean d\u00e2y s\u1ed1ng cho bi\u1ebft khi n\u00e0o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y gi\u00fap h\u00ecnh dung qu\u00e1 tr\u00ecnh x\u1eed l\u00fd song song.<\/li>\n
              • Tin nh\u1eafn (Messages):<\/strong>C\u00e1c m\u0169i t\u00ean ngang gi\u1eefa c\u00e1c d\u00e2y s\u1ed1ng. M\u0169i t\u00ean li\u1ec1n (m\u0169i t\u00ean \u0111\u1ea7y) cho bi\u1ebft tin nh\u1eafn \u0111\u1ed3ng b\u1ed9 (ch\u1edd ph\u1ea3n h\u1ed3i). M\u0169i t\u00ean \u0111\u1ee9t (m\u0169i t\u00ean g\u1ea1ch) cho bi\u1ebft tin nh\u1eafn b\u1ea5t \u0111\u1ed3ng b\u1ed9 (g\u1eedi \u0111i r\u1ed3i qu\u00ean). M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n c\u00f3 m\u0169i t\u00ean h\u1edf th\u01b0\u1eddng ch\u1ec9 tin nh\u1eafn tr\u1ea3 v\u1ec1.<\/li>\n
              • Khung (Frames):<\/strong>C\u00e1c h\u00ecnh ch\u1eef nh\u1eadt bao quanh m\u1ed9t nh\u00f3m tin nh\u1eafn \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n b\u1eb1ng c\u00e1c t\u1eeb kh\u00f3a nh\u01b0 alt<\/code> (t\u00f9y ch\u1ecdn), t\u00f9y ch\u1ecdn<\/code> (t\u00f9y ch\u1ecdn), ho\u1eb7c v\u00f2ng l\u1eb7p<\/code> (l\u1eb7p l\u1ea1i).<\/li>\n<\/ul>\n

                S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng<\/h3>\n

                S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng ho\u1ea1t \u0111\u1ed9ng gi\u1ed1ng nh\u01b0 s\u01a1 \u0111\u1ed3 d\u00f2ng ch\u1ea3y. Ch\u00fang th\u1ec3 hi\u1ec7n quy tr\u00ecnh l\u00e0m vi\u1ec7c t\u1eeb \u0111\u1ea7u \u0111\u1ebfn cu\u1ed1i.<\/p>\n

                  \n
                • N\u00fat b\u1eaft \u0111\u1ea7u:<\/strong> M\u1ed9t h\u00ecnh tr\u00f2n \u0111en \u0111\u1eadm.<\/li>\n
                • N\u00fat k\u1ebft th\u00fac:<\/strong> M\u1ed9t h\u00ecnh tr\u00f2n \u0111en n\u1eb1m b\u00ean trong m\u1ed9t v\u00e0nh tr\u00f2n \u0111en l\u1edbn h\u01a1n.<\/li>\n
                • N\u00fat quy\u1ebft \u0111\u1ecbnh:<\/strong> H\u00ecnh thoi \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n logic nh\u00e1nh (c\u00e2u l\u1ec7nh if\/else).<\/li>\n
                • C\u00e1c l\u00e0n b\u01a1i:<\/strong> C\u00e1c d\u1ea3i n\u1eb1m ngang ho\u1eb7c d\u1ecdc \u0111\u1ec3 t\u1ed5 ch\u1ee9c c\u00e1c ho\u1ea1t \u0111\u1ed9ng theo tr\u00e1ch nhi\u1ec7m (v\u00ed d\u1ee5: \u201cNg\u01b0\u1eddi d\u00f9ng\u201d, \u201cM\u00e1y ch\u1ee7\u201d, \u201cC\u01a1 s\u1edf d\u1eef li\u1ec7u\u201d).<\/li>\n<\/ul>\n

                  S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i<\/h3>\n

                  Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y l\u00fd t\u01b0\u1edfng cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 chu k\u1ef3 s\u1ed1ng ph\u1ee9c t\u1ea1p, nh\u01b0 m\u1ed9t \u0110\u01a1n h\u00e0ng ho\u1eb7c Phi\u00ean \u0111\u0103ng nh\u1eadp Ng\u01b0\u1eddi d\u00f9ng.<\/p>\n

                    \n
                  • Tr\u1ea1ng th\u00e1i:<\/strong> C\u00e1c h\u00ecnh ch\u1eef nh\u1eadt tr\u00f2n th\u1ec3 hi\u1ec7n c\u00e1c \u0111i\u1ec1u ki\u1ec7n m\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng tho\u1ea3 m\u00e3n m\u1ed9t b\u1ea5t bi\u1ebfn (v\u00ed d\u1ee5: \u201c\u0110ang ch\u1edd\u201d, \u201c\u0110\u00e3 g\u1eedi\u201d, \u201c\u0110\u00e3 giao\u201d).<\/li>\n
                  • Chuy\u1ec3n ti\u1ebfp:<\/strong> C\u00e1c m\u0169i t\u00ean di chuy\u1ec3n t\u1eeb m\u1ed9t tr\u1ea1ng th\u00e1i sang tr\u1ea1ng th\u00e1i kh\u00e1c, \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi c\u00e1c s\u1ef1 ki\u1ec7n.<\/li>\n
                  • S\u1ef1 ki\u1ec7n:<\/strong> C\u00e1c s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i (v\u00ed d\u1ee5: \u201cThanh to\u00e1n \u0111\u00e3 nh\u1eadn\u201d).<\/li>\n<\/ul>\n

                    B\u1ea3ng k\u00fd hi\u1ec7u v\u00e0 m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn \ud83d\udea6<\/h2>\n

                    Ghi nh\u1edb c\u00e1c k\u00fd hi\u1ec7u l\u00e0 c\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc c\u1ee7a b\u1ea1n. Tham kh\u1ea3o b\u1ea3ng n\u00e0y \u0111\u1ec3 tra c\u1ee9u nhanh trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n.<\/p>\n\n\n\n\n\n\n\n\n\n\n
                    K\u00fd hi\u1ec7u<\/th>\nLo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\n\u00dd ngh\u0129a<\/th>\n<\/tr>\n<\/thead>\n
                    \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25b6<\/td>\nLi\u00ean k\u1ebft<\/td>\nM\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. C\u00f3 th\u1ec3 l\u00e0 hai chi\u1ec1u.<\/td>\n<\/tr>\n
                    \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25c7<\/td>\nT\u1ed5ng h\u1ee3p<\/td>\nM\u1ed9t 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 (v\u00ed d\u1ee5: M\u1ed9t Ph\u00f2ng ban c\u00f3 Nh\u00e2n vi\u00ean).<\/td>\n<\/tr>\n
                    \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25c6<\/td>\nTh\u00e0nh ph\u1ea7n<\/td>\nM\u1ed9t m\u1ed1i quan h\u1ec7 to\u00e0n b\u1ed9-ph\u1ea7n m\u1ea1nh m\u1ebd trong \u0111\u00f3 ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n b\u1ed9 (v\u00ed d\u1ee5: M\u1ed9t Ng\u00f4i nh\u00e0 c\u00f3 Ph\u00f2ng).<\/td>\n<\/tr>\n
                    \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25b3<\/td>\nT\u1ed5ng qu\u00e1t h\u00f3a<\/td>\nBi\u1ec3u di\u1ec5n k\u1ebf th\u1eeba. Tam gi\u00e1c ch\u1ec9 v\u1ec1 l\u1edbp cha.<\/td>\n<\/tr>\n
                    \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2504\u2504\u25b6<\/td>\nPh\u1ee5 thu\u1ed9c<\/td>\nM\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t cho th\u1ea5y m\u1ed9t ph\u1ea7n t\u1eed s\u1eed d\u1ee5ng ho\u1eb7c ph\u1ee5 thu\u1ed9c v\u00e0o ph\u1ea7n t\u1eed kh\u00e1c. Nh\u1eefng thay \u0111\u1ed5i trong m\u1ed1i ph\u1ee5 thu\u1ed9c c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ph\u1ea7n t\u1eed b\u1ecb ph\u1ee5 thu\u1ed9c.<\/td>\n<\/tr>\n
                    \u2500\u2504\u2504\u2504\u25b6<\/td>\nTh\u1ef1c hi\u1ec7n<\/td>\n\u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t v\u1edbi tam gi\u00e1c r\u1ed7ng. Cho bi\u1ebft m\u1ed9t giao di\u1ec7n \u0111ang \u0111\u01b0\u1ee3c tri\u1ec3n khai.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    M\u1ed9t Chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ec3 \u0110\u1ecdc C\u00e1c S\u01a1 \u0110\u1ed3 Ph\u1ee9c T\u1ea1p \ud83e\udde0<\/h2>\n

                    Khi \u0111\u1ed1i di\u1ec7n v\u1edbi m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p, vi\u1ec7c nh\u00ecn v\u00e0o to\u00e0n b\u1ed9 b\u1ee9c tranh c\u00f3 th\u1ec3 khi\u1ebfn b\u1ea1n cho\u00e1ng ng\u1ee3p. H\u00e3y s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p h\u1ec7 th\u1ed1ng n\u00e0y \u0111\u1ec3 ph\u00e2n t\u00edch t\u1eebng ph\u1ea7n:<\/p>\n

                      \n
                    1. X\u00e1c \u0111\u1ecbnh M\u1ee5c \u0111\u00edch:<\/strong> Ki\u1ec3m tra ti\u00eau \u0111\u1ec1. \u0110\u00e2y c\u00f3 ph\u1ea3i l\u00e0 s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 hay s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng? \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh b\u1ed1i c\u1ea3nh ngay l\u1eadp t\u1ee9c.<\/li>\n
                    2. X\u00e1c \u0111\u1ecbnh \u0110i\u1ec3m V\u00e0o:<\/strong> Trong s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1, h\u00e3y t\u00ecm t\u00e1c nh\u00e2n ban \u0111\u1ea7u. Trong s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng, h\u00e3y t\u00ecm n\u00fat b\u1eaft \u0111\u1ea7u. Theo d\u00f5i h\u00e0nh tr\u00ecnh t\u1eeb \u0111\u00f3.<\/li>\n
                    3. Ph\u00e2n t\u00edch M\u1ed1i quan h\u1ec7 Tr\u01b0\u1edbc ti\u00ean:<\/strong> Nh\u00ecn v\u00e0o c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c h\u1ed9p. Hi\u1ec3u ai n\u00f3i chuy\u1ec7n v\u1edbi ai tr\u01b0\u1edbc khi xem x\u00e9t d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 \u0111ang \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/li>\n
                    4. Ki\u1ec3m tra S\u1ed1 l\u01b0\u1ee3ng:<\/strong> N\u1ebfu \u0111ang \u0111\u1ecdc s\u01a1 \u0111\u1ed3 l\u1edbp, h\u00e3y ghi ch\u00fa c\u00e1c con s\u1ed1 g\u1ea7n c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i. \u0110i\u1ec1u n\u00e0y cho b\u1ea1n bi\u1ebft li\u1ec7u m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111a c\u00f3 t\u1ed3n t\u1ea1i hay kh\u00f4ng.<\/li>\n
                    5. Theo d\u00f5i V\u00f2ng l\u1eb7p:<\/strong> N\u1ebfu b\u1ea1n th\u1ea5y khung v\u00f2ng l\u1eb7p ho\u1eb7c m\u0169i t\u00ean \u0111\u1ec7 quy, h\u00e3y hi\u1ec3u \u0111i\u1ec1u ki\u1ec7n k\u1ebft th\u00fac. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ng\u1eeba l\u1ed7i logic v\u00f4 h\u1ea1n trong m\u00f4 h\u00ecnh t\u01b0 duy c\u1ee7a b\u1ea1n.<\/li>\n
                    6. X\u00e1c minh R\u00e0ng bu\u1ed9c:<\/strong> Nh\u00ecn v\u00e0o c\u00e1c d\u1ea5u ngo\u1eb7c nh\u1ecdn {}<\/code> ch\u1ee9a c\u00e1c ghi ch\u00fa ho\u1eb7c r\u00e0ng bu\u1ed9c. Nh\u1eefng ph\u1ea7n n\u00e0y th\u01b0\u1eddng ch\u1ee9a c\u00e1c quy t\u1eafc kinh doanh quan tr\u1ecdng.<\/li>\n<\/ol>\n

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

                      Ngay c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 hi\u1ec3u sai s\u01a1 \u0111\u1ed3 n\u1ebfu v\u1ed9i v\u00e0ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn c\u1ea7n l\u01b0u \u00fd:<\/p>\n

                        \n
                      • B\u1ecf qua t\u00ednh cardinality:<\/strong>Gi\u1ea3 \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 m\u1ed9t-m\u1ed9t khi s\u01a1 \u0111\u1ed3 hi\u1ec3n th\u1ecb m\u1ed9t-nhi\u1ec1u. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u sai l\u1ec7ch.<\/li>\n
                      • Nh\u1ea7m l\u1eabn gi\u1eefa t\u00edch h\u1ee3p (aggregation) v\u00e0 k\u1ebft h\u1ee3p (composition):<\/strong>Xem m\u1ed9t m\u1ed1i quan h\u1ec7 y\u1ebfu nh\u01b0 m\u1ed9t m\u1ed1i quan h\u1ec7 m\u1ea1nh. K\u1ebft h\u1ee3p ng\u1ee5 \u00fd s\u1edf h\u1eefu; t\u00edch h\u1ee3p ng\u1ee5 \u00fd tham chi\u1ebfu.<\/li>\n
                      • B\u1ecf qua t\u00ednh kh\u1ea3 ki\u1ebfn:<\/strong>Gi\u1ea3 \u0111\u1ecbnh t\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ec1u c\u00f4ng khai. Trong c\u00e1c l\u1edbp ri\u00eang t\u01b0, logic n\u1ed9i b\u1ed9 b\u1ecb \u1ea9n, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch b\u1ea1n t\u00edch h\u1ee3p v\u1edbi h\u1ec7 th\u1ed1ng.<\/li>\n
                      • Hi\u1ec3u sai c\u00e1c m\u0169i t\u00ean:<\/strong>Nh\u1ea7m l\u1eabn m\u0169i t\u00ean ph\u1ee5 thu\u1ed9c v\u1edbi m\u0169i t\u00ean t\u1ed5ng qu\u00e1t h\u00f3a. \u0110\u1ea7u h\u00ecnh tam gi\u00e1c kh\u00e1c bi\u1ec7t v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean m\u1edf.<\/li>\n
                      • B\u1ecf qua ch\u00fa th\u00edch (legend):<\/strong>M\u1ed9t s\u1ed1 s\u01a1 \u0111\u1ed3 s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u t\u00f9y ch\u1ec9nh. Lu\u00f4n ki\u1ec3m tra ph\u1ea7n ch\u00fa th\u00edch ho\u1eb7c ph\u1ea7n ghi ch\u00fa \u0111\u1ec3 bi\u1ebft c\u00e1c k\u00fd hi\u1ec7u kh\u00f4ng chu\u1ea9n.<\/li>\n<\/ul>\n

                        \u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf trong c\u00e1c d\u1ef1 \u00e1n \ud83d\udca1<\/h2>\n

                        Bi\u1ebft c\u00e1ch \u0111\u1ecdc UML l\u00e0 m\u1ed9t \u0111i\u1ec1u; bi\u1ebft khi n\u00e0o c\u1ea7n t\u1ea1o ch\u00fang l\u00e0 \u0111i\u1ec1u kh\u00e1c. Trong m\u00f4i tr\u01b0\u1eddng chuy\u00ean nghi\u1ec7p, c\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng gi\u1eefa giai \u0111o\u1ea1n thi\u1ebft k\u1ebf v\u00e0 giai \u0111o\u1ea1n l\u1eadp tr\u00ecnh.<\/p>\n

                          \n
                        • Trong c\u00e1c bu\u1ed5i xem x\u00e9t thi\u1ebft k\u1ebf:<\/strong>S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ec3 x\u00e1c minh m\u00f4 h\u00ecnh \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u kinh doanh hay kh\u00f4ng. Ki\u1ec3m tra xem t\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh c\u1ea7n thi\u1ebft c\u00f3 m\u1eb7t hay kh\u00f4ng.<\/li>\n
                        • Trong qu\u00e1 tr\u00ecnh l\u00e0m quen v\u1edbi d\u1ef1 \u00e1n:<\/strong>C\u00e1c th\u00e0nh vi\u00ean m\u1edbi c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 \u0111\u1ec3 hi\u1ec3u c\u00e1ch c\u00e1c l\u1eddi g\u1ecdi API ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ecdc h\u00e0ng ng\u00e0n d\u00f2ng m\u00e3.<\/li>\n
                        • Trong qu\u00e1 tr\u00ecnh t\u00e1i c\u1ea5u tr\u00fac:<\/strong>S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i gi\u00fap h\u00ecnh dung c\u00e1c thay \u0111\u1ed5i logic ph\u1ee9c t\u1ea1p tr\u01b0\u1edbc khi tri\u1ec3n khai v\u00e0o c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n.<\/li>\n
                        • Trong qu\u00e1 tr\u00ecnh t\u00e0i li\u1ec7u h\u00f3a:<\/strong>S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 gi\u1ea3i th\u00edch lu\u1ed3ng c\u00f4ng vi\u1ec7c ng\u01b0\u1eddi d\u00f9ng cho c\u00e1c b\u00ean li\u00ean quan kh\u00f4ng chuy\u00ean v\u1ec1 k\u1ef9 thu\u1eadt.<\/li>\n<\/ul>\n

                          X\u00e2y d\u1ef1ng k\u1ef9 n\u0103ng c\u1ee7a b\u1ea1n theo th\u1eddi gian \ud83d\udcda<\/h2>\n

                          Th\u00e0nh th\u1ea1o UML \u0111\u1ebfn t\u1eeb th\u1ef1c h\u00e0nh. B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n cho c\u00e1c d\u1ef1 \u00e1n c\u1ee7a ch\u00ednh b\u1ea1n. V\u1ebd s\u01a1 \u0111\u1ed3 l\u1edbp cho \u1ee9ng d\u1ee5ng danh s\u00e1ch vi\u1ec7c c\u1ea7n l\u00e0m. T\u1ea1o s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 cho ch\u1ee9c n\u0103ng \u201cTh\u00eam nhi\u1ec7m v\u1ee5\u201d. Khi luy\u1ec7n t\u1eadp, c\u00e1c k\u00fd hi\u1ec7u s\u1ebd tr\u1edf n\u00ean t\u1ef1 nhi\u00ean nh\u01b0 th\u00f3i quen.<\/p>\n

                          C\u0169ng r\u1ea5t c\u00f3 l\u1ee3i khi xem x\u00e9t c\u00e1c s\u01a1 \u0111\u1ed3 do ng\u01b0\u1eddi kh\u00e1c t\u1ea1o ra. Khi b\u1ea1n m\u1edf m\u1ed9t kho l\u01b0u tr\u1eef ho\u1eb7c \u0111\u1ecdc m\u1ed9t t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt, h\u00e3y t\u00ecm c\u00e1c t\u00e0i li\u1ec7u thi\u1ebft k\u1ebf. So s\u00e1nh s\u01a1 \u0111\u1ed3 v\u1edbi m\u00e3 th\u1ef1c t\u1ebf. C\u00e1c ph\u01b0\u01a1ng th\u1ee9c trong s\u01a1 \u0111\u1ed3 l\u1edbp c\u00f3 kh\u1edbp v\u1edbi c\u00e1c h\u00e0m trong m\u00e3 ngu\u1ed3n kh\u00f4ng? C\u00e1c m\u1ed1i quan h\u1ec7 trong s\u01a1 \u0111\u1ed3 c\u00f3 ph\u1ea3n \u00e1nh \u0111\u00fang c\u00e1c ph\u1ee5 thu\u1ed9c th\u1ef1c t\u1ebf trong d\u1ef1 \u00e1n kh\u00f4ng? S\u1ef1 so s\u00e1nh n\u00e0y gi\u00fap l\u1ea5p \u0111\u1ea7y kho\u1ea3ng c\u00e1ch gi\u1eefa l\u00fd thuy\u1ebft v\u00e0 th\u1ef1c h\u00e0nh.<\/p>\n

                          Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 kh\u1ea3 n\u0103ng \u0111\u1ecdc hi\u1ec3u s\u01a1 \u0111\u1ed3 \ud83c\udf93<\/h2>\n

                          UML kh\u00f4ng ch\u1ec9 l\u00e0 c\u00f4ng c\u1ee5 v\u1ebd s\u01a1 \u0111\u1ed3; \u0111\u00f3 l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef giao ti\u1ebfp. Th\u00e0nh th\u1ea1o ng\u00f4n ng\u1eef n\u00e0y gi\u00fap b\u1ea1n tham gia v\u00e0o c\u00e1c cu\u1ed9c th\u1ea3o lu\u1eadn c\u1ea5p cao v\u1ec1 ki\u1ebfn tr\u00fac v\u00e0 \u0111\u1ea3m b\u1ea3o m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft k\u1ebf d\u1ef1 ki\u1ebfn. B\u1eb1ng c\u00e1ch hi\u1ec3u c\u00e1c k\u00fd hi\u1ec7u, m\u1ed1i quan h\u1ec7 v\u00e0 lu\u1ed3ng, b\u1ea1n gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 v\u00e0 n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m c\u1ee7a m\u00ecnh.<\/p>\n

                          Gi\u1eef h\u01b0\u1edbng d\u1eabn n\u00e0y s\u1eb5n s\u00e0ng \u0111\u1ec3 tham kh\u1ea3o. Khi b\u1ea1n g\u1eb7p lo\u1ea1i s\u01a1 \u0111\u1ed3 m\u1edbi, h\u00e3y quay l\u1ea1i c\u00e1c th\u1ec3 lo\u1ea1i v\u00e0 k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c n\u00eau \u1edf \u0111\u00e2y. V\u1edbi th\u1ef1c h\u00e0nh \u0111\u1ec1u \u0111\u1eb7n, vi\u1ec7c \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y s\u1ebd tr\u1edf n\u00ean t\u1ef1 nhi\u00ean nh\u01b0 vi\u1ec7c \u0111\u1ecdc m\u00e3 ngu\u1ed3n v\u1eady.<\/p>\n","protected":false},"excerpt":{"rendered":"

                          Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 UML, \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd ti\u00eau chu\u1ea9n cho ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m. D\u00f9 b\u1ea1n \u0111ang thi\u1ebft k\u1ebf…<\/p>\n","protected":false},"author":1,"featured_media":367,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"C\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 UML: H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u \ud83d\udcd0","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 UML m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. 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