{"id":1514,"date":"2026-04-11T20:19:20","date_gmt":"2026-04-11T12:19:20","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/myth-busting-uml-object-diagrams\/"},"modified":"2026-04-11T20:19:20","modified_gmt":"2026-04-11T12:19:20","slug":"myth-busting-uml-object-diagrams","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/myth-busting-uml-object-diagrams\/","title":{"rendered":"Ph\u00e1 v\u1ee1 Nh\u1eefng L\u1ea7m T\u01b0\u1edfng V\u1ec1 S\u01a1 \u0110\u1ed3 \u0110\u1ed1i T\u01b0\u1ee3ng UML: Ph\u00e2n Bi\u1ec7t S\u1ef1 Th\u1eadt V\u1edbi Nh\u1eefng Huy\u1ec1n Tho\u1ea1i"},"content":{"rendered":"

Hi\u1ec3u \u0111\u01b0\u1ee3c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m \u0111\u00f2i h\u1ecfi m\u1ed9t t\u1ea7m nh\u00ecn r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u t\u1ed3n t\u1ea1i t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) cung c\u1ea5p nhi\u1ec1u c\u00f4ng c\u1ee5 cho m\u1ee5c \u0111\u00edch n\u00e0y, nh\u01b0ng S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML<\/strong>th\u01b0\u1eddng b\u1ecb che l\u1ea5p b\u1edfi ng\u01b0\u1eddi anh em n\u1ed5i ti\u1ebfng h\u01a1n, s\u01a1 \u0111\u1ed3 l\u1edbp. Nhi\u1ec1u nh\u00e0 th\u1ef1c h\u00e0nh coi n\u00f3 l\u00e0 t\u00f9y ch\u1ecdn ho\u1eb7c nh\u1ea7m l\u1eabn v\u1edbi c\u00e1c h\u00ecnh bi\u1ec3u di\u1ec5n tr\u1ef1c quan kh\u00e1c. H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111i s\u00e2u v\u00e0o chi ti\u1ebft m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed1i t\u01b0\u1ee3ng, ph\u00e2n bi\u1ec7t c\u00e1c th\u1ef1c h\u00e0nh k\u1ef9 thu\u1eadt \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp v\u1edbi nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn.<\/p>\n

\"Child-style<\/figure>\n

Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec? \ud83d\udcca<\/h2>\n

S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea1i di\u1ec7n cho m\u1ed9t b\u1ee9c \u1ea3nh t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp x\u00e1c \u0111\u1ecbnh b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf \u2014 c\u00e1c quy t\u1eafc, ki\u1ec3u d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ti\u1ec1m n\u0103ng \u2014 th\u00ec s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c \u0111i\u1ec1n theo nh\u1eefng quy t\u1eafc \u0111\u00f3. H\u00e3y h\u00ecnh dung s\u01a1 \u0111\u1ed3 l\u1edbp nh\u01b0 b\u1ea3n v\u1ebd ki\u1ebfn tr\u00fac cho m\u1ed9t t\u00f2a nh\u00e0, c\u00f2n s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p t\u00f2a nh\u00e0 sau khi \u0111\u00e3 x\u00e2y d\u1ef1ng xong v\u00e0 \u0111\u01b0\u1ee3c trang b\u1ecb n\u1ed9i th\u1ea5t.<\/p>\n

    \n
  • Bi\u1ec3u di\u1ec5n t\u0129nh:<\/strong> N\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec7n th\u1eddi gian hay th\u1ee9 t\u1ef1. N\u00f3 th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i.<\/li>\n
  • C\u00e1c th\u1ec3 hi\u1ec7n:<\/strong> N\u00f3 t\u1eadp trung v\u00e0o c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a l\u1edbp, ch\u1ee9 kh\u00f4ng ph\u1ea3i b\u1ea3n th\u00e2n c\u00e1c l\u1edbp.<\/li>\n
  • Li\u00ean k\u1ebft:<\/strong> N\u00f3 m\u00f4 t\u1ea3 c\u00e1c k\u1ebft n\u1ed1i gi\u1eefa nh\u1eefng th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 n\u00e0y.<\/li>\n
  • Gi\u00e1 tr\u1ecb:<\/strong> N\u00f3 c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c g\u00e1n cho c\u00e1c th\u1ec3 hi\u1ec7n.<\/li>\n<\/ul>\n

    S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng. N\u1ebfu b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng m\u00e0 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, vi\u1ec7c c\u00f3 c\u00e1i nh\u00ecn r\u00f5 r\u00e0ng v\u1ec1 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n s\u1ebd gi\u00fap ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i logic trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai.<\/p>\n

    C\u1ea5u t\u1ea1o c\u1ee7a S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng \ud83d\udd0d<\/h2>\n

    \u0110\u1ec3 l\u00e0m vi\u1ec7c hi\u1ec7u qu\u1ea3 v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, ng\u01b0\u1eddi ta ph\u1ea3i hi\u1ec3u r\u00f5 k\u00fd hi\u1ec7u chu\u1ea9n. M\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u c\u00f3 m\u1ee5c \u0111\u00edch ri\u00eang, v\u00e0 s\u1ef1 sai l\u1ec7ch c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec3u l\u1ea7m gi\u1eefa c\u00e1c th\u00e0nh vi\u00ean trong nh\u00f3m.<\/p>\n

      \n
    • T\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>Vi\u1ebft b\u1eb1ng ch\u1eef in \u0111\u1eadm ho\u1eb7c nghi\u00eang, th\u01b0\u1eddng \u0111\u01b0\u1ee3c ti\u1ec1n t\u1ed1 b\u1eb1ng t\u00ean l\u1edbp (v\u00ed d\u1ee5, kh\u00e1ch_h\u00e0ng: Kh\u00e1ch_h\u00e0ng<\/code>). M\u1ed9t s\u1ed1 k\u00fd hi\u1ec7u b\u1ecf qua t\u00ean l\u1edbp n\u1ebfu ng\u1eef c\u1ea3nh \u0111\u00e3 r\u00f5.<\/li>\n
    • Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh:<\/strong>Li\u1ec7t k\u00ea b\u00ean trong h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng, th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i hi\u1ec7n t\u1ea1i (v\u00ed d\u1ee5, tr\u1ea1ng_th\u00e1i: \u0110ang ho\u1ea1t \u0111\u1ed9ng<\/code>).<\/li>\n
    • Li\u00ean k\u1ebft:<\/strong>C\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c m\u1ed1i li\u00ean k\u1ebft trong s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n
    • \u0110a d\u1ea1ng:<\/strong>Ch\u1ec9 ra c\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft (v\u00ed d\u1ee5: 1..*, 0..1).<\/li>\n
    • \u0110i\u1ec1u h\u01b0\u1edbng:<\/strong> C\u00e1c m\u0169i t\u00ean tr\u00ean c\u00e1c li\u00ean k\u1ebft cho th\u1ea5y h\u01b0\u1edbng tham chi\u1ebfu.<\/li>\n<\/ul>\n

      Nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn b\u1ecb b\u00e1c b\u1ecf \ud83d\udeab<\/h2>\n

      C\u00f3 r\u1ea5t nhi\u1ec1u ti\u1ebfng \u1ed3n trong ng\u00e0nh v\u1ec1 vi\u1ec7c khi n\u00e0o v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y. D\u01b0\u1edbi \u0111\u00e2y, ch\u00fang t\u00f4i gi\u1ea3i quy\u1ebft nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/p>\n

      Hi\u1ec3u l\u1ea7m 1: N\u00f3 ch\u1ec9 l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp m\u00e0 kh\u00f4ng c\u00f3 c\u00e1c h\u1ed9p l\u1edbp \ud83e\udd14<\/h3>\n

      \u0110i\u1ec1u n\u00e0y l\u00e0 sai. M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ecbnh ngh\u0129a ki\u1ec3u d\u1eef li\u1ec7u. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ecbnh ngh\u0129a c\u00e1c th\u1ec3 hi\u1ec7n. B\u1ea1n kh\u00f4ng th\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng h\u1ee3p l\u1ec7 ch\u1ec9 b\u1eb1ng c\u00e1ch thay th\u1ebf c\u00e1c h\u1ed9p l\u1edbp b\u1eb1ng h\u1ed9p th\u1ec3 hi\u1ec7n n\u1ebfu c\u00e1c m\u1ed1i quan h\u1ec7 n\u1ec1n t\u1ea3ng kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ed1i chi\u1ebfu v\u1edbi c\u00e1c r\u00e0ng bu\u1ed9c l\u1edbp. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i tu\u00e2n th\u1ee7 c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong m\u00f4 h\u00ecnh l\u1edbp.<\/p>\n

      Hi\u1ec3u l\u1ea7m 2: N\u00f3 cho th\u1ea5y h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o (h\u00e0nh vi) \u2699\ufe0f<\/h3>\n

      H\u00e0nh vi thu\u1ed9c v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 ho\u1eb7c s\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ho\u00e0n to\u00e0n mang t\u00ednh c\u1ea5u tr\u00fac. N\u00f3 cho th\u1ea5y \u0111i\u1ec1u g\u00ec<\/em>t\u1ed3n t\u1ea1i, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u00e1ch<\/em>n\u00f3 thay \u0111\u1ed5i theo th\u1eddi gian. N\u1ebfu b\u1ea1n c\u1ea7n th\u1ec3 hi\u1ec7n m\u1ed9t l\u1eddi g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c m\u1ed9t chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i, \u0111\u1eebng s\u1eed d\u1ee5ng lo\u1ea1i s\u01a1 \u0111\u1ed3 n\u00e0y.<\/p>\n

      Hi\u1ec3u l\u1ea7m 3: B\u1ea1n c\u1ea7n m\u1ed9t cho m\u1ed7i t\u00ecnh hu\u1ed1ng \ud83d\uddc2\ufe0f<\/h3>\n

      Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng cho t\u1eebng tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ri\u00eang l\u1ebb s\u1ebd d\u1eabn \u0111\u1ebfn s\u1ef1 ph\u00ecnh to t\u00e0i li\u1ec7u. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y t\u1ed1t nh\u1ea5t n\u00ean d\u00e0nh cho c\u00e1c t\u00ecnh hu\u1ed1ng t\u00edch h\u1ee3p ph\u1ee9c t\u1ea1p, tr\u1ea1ng th\u00e1i tu\u1ea7n t\u1ef1 h\u00f3a ho\u1eb7c g\u1ee1 l\u1ed7i c\u00e1c v\u1ea5n \u0111\u1ec1 c\u1ee5 th\u1ec3 v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a qu\u00e1 m\u1ee9c s\u1ebd d\u1eabn \u0111\u1ebfn nh\u1eefng c\u01a1n \u00e1c m\u1ed9ng trong b\u1ea3o tr\u00ec.<\/p>\n

      Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng so v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp \ud83c\udd9a<\/h2>\n

      Vi\u1ec7c ch\u1ecdn c\u00f4ng c\u1ee5 ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee5c ti\u00eau c\u1ee7a t\u00e0i li\u1ec7u. B\u1ea3ng sau \u0111\u00e2y l\u00e0m r\u00f5 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n\n\n\n\n\n
      T\u00ednh n\u0103ng<\/th>\nS\u01a1 \u0111\u1ed3 l\u1edbp<\/th>\nS\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
      Tr\u1ecdng t\u00e2m<\/strong><\/td>\nC\u1ea5u tr\u00fac v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u<\/td>\nTh\u1ec3 hi\u1ec7n v\u00e0 d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
      Th\u1eddi gian<\/strong><\/td>\nT\u0129nh (b\u1ea3n v\u1ebd s\u01a1 b\u1ed9)<\/td>\nT\u0129nh (b\u1ee9c \u1ea3nh ch\u1ee5p)<\/td>\n<\/tr>\n
      M\u1ee9c \u0111\u1ed9 chi ti\u1ebft<\/strong><\/td>\nTr\u1eebu t\u01b0\u1ee3ng (Thu\u1ed9c t\u00ednh, Ph\u01b0\u01a1ng th\u1ee9c)<\/td>\nC\u1ee5 th\u1ec3 (Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh)<\/td>\n<\/tr>\n
      Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong><\/td>\nThi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng, Ki\u1ebfn tr\u00fac<\/td>\nG\u1ee1 l\u1ed7i, X\u00e1c minh d\u1eef li\u1ec7u, Chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Kh\u00e1m ph\u00e1 s\u00e2u: M\u1ed1i quan h\u1ec7 v\u00e0 t\u00ednh \u0111a d\u1ea1ng \ud83d\udd17<\/h2>\n

      S\u1ee9c m\u1ea1nh c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u1eb1m \u1edf kh\u1ea3 n\u0103ng tr\u1ef1c quan h\u00f3a c\u00e1c r\u00e0ng bu\u1ed9c ph\u1ee9c t\u1ea1p v\u1ec1 t\u00ednh \u0111a d\u1ea1ng. Trong s\u01a1 \u0111\u1ed3 l\u1edbp, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y m\u1ed9t 1..*<\/code> m\u1ed1i quan h\u1ec7 gi\u1eefa m\u1ed9t Th\u01b0 vi\u1ec7n<\/code> v\u00e0 m\u1ed9t S\u00e1ch<\/code>. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, b\u1ea1n ph\u1ea3i v\u1ebd r\u00f5 r\u00e0ng c\u00e1c li\u00ean k\u1ebft th\u1ecfa m\u00e3n quy t\u1eafc n\u00e0y.<\/p>\n

      X\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng m\u00e0 m\u1ed9t Ng\u01b0\u1eddi d\u00f9ng<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng s\u1edf h\u1eefu nhi\u1ec1u \u0110\u01a1n h\u00e0ng<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd hi\u1ec3n th\u1ecb c\u00e1c c\u1ee5 th\u1ec3 \u0111\u01a1n_h\u00e0ng_1<\/code>, \u0111\u01a1n_h\u00e0ng_2<\/code>, v\u00e0 \u0111\u01a1n_h\u00e0ng_3<\/code> c\u00e1c th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi ng\u01b0\u1eddi_d\u00f9ng_a<\/code> th\u1ec3 hi\u1ec7n. Vi\u1ec7c x\u00e1c nh\u1eadn tr\u1ef1c quan n\u00e0y gi\u00fap c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ki\u1ec3m tra xem m\u00e3 ngu\u1ed3n c\u00f3 x\u1eed l\u00fd \u0111\u00fang m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111a \u0111\u00fang hay kh\u00f4ng.<\/p>\n

      C\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7 ch\u00ednh<\/h3>\n
        \n
      • Li\u00ean k\u1ebft:<\/strong> M\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac chung. (v\u00ed d\u1ee5: M\u1ed9t ng\u01b0\u1eddi \u0111i\u1ec1u khi\u1ec3n m\u1ed9t chi\u1ebfc xe h\u01a1i).<\/li>\n
      • T\u1ed5ng h\u1ee3p:<\/strong> M\u1ed9t m\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n, trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. (v\u00ed d\u1ee5: M\u1ed9t Ph\u00f2ng ban c\u00f3 Nh\u00e2n vi\u00ean).<\/li>\n
      • Th\u00e0nh ph\u1ea7n:<\/strong> M\u1ed9t m\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-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 th\u1ec3. (v\u00ed d\u1ee5: M\u1ed9t Ng\u00f4i nh\u00e0 c\u00f3 Ph\u00f2ng \u1ed1c).<\/li>\n
      • Ph\u1ee5 thu\u1ed9c:<\/strong> M\u1ed9t m\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng. (v\u00ed d\u1ee5: M\u1ed9t L\u1edbp s\u1eed d\u1ee5ng m\u1ed9t L\u1edbp kh\u00e1c).<\/li>\n<\/ul>\n

        T\u00edch h\u1ee3p v\u1edbi c\u00e1c y\u1ebfu t\u1ed1 m\u00f4 h\u00ecnh h\u00f3a kh\u00e1c \ud83d\udcce<\/h2>\n

        S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. N\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c ph\u1ea7n kh\u00e1c c\u1ee7a m\u00f4 h\u00ecnh \u0111\u1ec3 cung c\u1ea5p b\u1ee9c tranh to\u00e0n di\u1ec7n v\u1ec1 ph\u1ea7n m\u1ec1m.<\/p>\n

        M\u1ed1i quan h\u1ec7 v\u1edbi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/h3>\n

        S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 th\u1ec3 hi\u1ec7n lu\u1ed3ng tin nh\u1eafn theo th\u1eddi gian. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u cho s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia t\u01b0\u01a1ng t\u00e1c, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c th\u00e0nh vi\u00ean trong s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 c\u00e1c th\u1ec3 hi\u1ec7n h\u1ee3p l\u1ec7 c\u1ee7a ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng.<\/p>\n

        M\u1ed1i quan h\u1ec7 v\u1edbi s\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i<\/h3>\n

        M\u00e1y tr\u1ea1ng th\u00e1i m\u00f4 t\u1ea3 v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng duy nh\u1ea5t. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n m\u1ed9t tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t \u0110\u01a1n h\u00e0ng<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 m\u00e1y tr\u1ea1ng th\u00e1i, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb \u0110\u01a1n h\u00e0ng<\/code> th\u1ec3 hi\u1ec7n v\u1edbi thu\u1ed9c t\u00ednh tr\u1ea1ng th\u00e1i: \u0110\u00e3 g\u1eedi<\/code>.<\/p>\n

        Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn khi x\u00e2y d\u1ef1ng \ud83d\uded1<\/h2>\n

        Ngay c\u1ea3 c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y. Tr\u00e1nh nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn sau \u0111\u1ec3 duy tr\u00ec s\u1ef1 r\u00f5 r\u00e0ng.<\/p>\n

          \n
        • T\u00ean g\u1ecdi kh\u00f4ng nh\u1ea5t qu\u00e1n:<\/strong>Pha tr\u1ed9n camelCase v\u00e0 snake_case cho t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd l\u00e0m ng\u01b0\u1eddi \u0111\u1ecdc b\u1ed1i r\u1ed1i. H\u00e3y tu\u00e2n theo m\u1ed9t quy \u01b0\u1edbc duy nh\u1ea5t.<\/li>\n
        • B\u1ecf qua b\u1ed9i s\u1ed1:<\/strong> V\u1ebd m\u1ed9t li\u00ean k\u1ebft vi ph\u1ea1m b\u1ed9i s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 l\u1edbp (v\u00ed d\u1ee5: n\u1ed1i m\u1ed9t-nhi\u1ec1u nh\u01b0 m\u1ed9t-m\u1ed9t).<\/li>\n
        • Qu\u00e1 t\u1ea3i:<\/strong> C\u1ed1 g\u1eafng th\u1ec3 hi\u1ec7n to\u00e0n b\u1ed9 tr\u1ea1ng th\u00e1i c\u01a1 s\u1edf d\u1eef li\u1ec7u trong m\u1ed9t s\u01a1 \u0111\u1ed3 s\u1ebd khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f3 \u0111\u1ecdc. H\u00e3y t\u1eadp trung v\u00e0o m\u1ed9t c\u1ee5m \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3.<\/li>\n
        • Thi\u1ebfu nh\u00e3n:<\/strong> C\u00e1c li\u00ean k\u1ebft n\u00ean \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n b\u1eb1ng t\u00ean vai tr\u00f2 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ec3 l\u00e0m r\u00f5 h\u01b0\u1edbng c\u1ee7a m\u1ed1i quan h\u1ec7.<\/li>\n
        • Nh\u1ea7m l\u1eabn gi\u1eefa ki\u1ec3u v\u00e0 th\u1ec3 hi\u1ec7n:<\/strong> \u0110\u1eebng \u0111\u00e1nh nh\u00e3n m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ec9 b\u1eb1ng t\u00ean l\u1edbp. N\u00f3 ph\u1ea3i cho th\u1ea5y \u0111\u00e2y l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n (v\u00ed d\u1ee5, th\u1ec3 hi\u1ec7n: Ki\u1ec3u<\/code>).<\/li>\n<\/ul>\n

          C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho tri\u1ec3n khai \ud83d\udee0\ufe0f<\/h2>\n

          \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y v\u1eabn l\u00e0 t\u00e0i s\u1ea3n h\u1eefu \u00edch thay v\u00ec s\u1ef1 l\u1ed9n x\u1ed9n, h\u00e3y tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn sau.<\/p>\n

          1. C\u1eadp nh\u1eadt ch\u00fang th\u01b0\u1eddng xuy\u00ean<\/h3>\n

          C\u00e1c s\u01a1 \u0111\u1ed3 l\u1ed7i th\u1eddi c\u00f2n t\u1ec7 h\u01a1n c\u1ea3 kh\u00f4ng c\u00f3 s\u01a1 \u0111\u1ed3. N\u1ebfu m\u00e3 ngu\u1ed3n thay \u0111\u1ed5i c\u1ea5u tr\u00fac d\u1eef li\u1ec7u, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i ph\u1ea3n \u00e1nh \u0111i\u1ec1u \u0111\u00f3. Xem ch\u00fang nh\u01b0 t\u00e0i li\u1ec7u s\u1ed1ng g\u1eafn li\u1ec1n v\u1edbi kho m\u00e3 ngu\u1ed3n.<\/p>\n

          2. S\u1eed d\u1ee5ng \u0111\u1ec3 g\u1ee1 l\u1ed7i<\/h3>\n

          Khi m\u1ed9t l\u1ed7i li\u00ean quan \u0111\u1ebfn c\u1ea5u tr\u00fac d\u1eef li\u1ec7u (v\u00ed d\u1ee5: ngo\u1ea1i l\u1ec7 con tr\u1ecf null, tham chi\u1ebfu v\u00f2ng), h\u00e3y v\u1ebd s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u1edf tr\u1ea1ng th\u00e1i th\u1ea5t b\u1ea1i. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng ti\u1ebft l\u1ed9 li\u00ean k\u1ebft b\u1ecb thi\u1ebfu ho\u1eb7c gi\u00e1 tr\u1ecb b\u1ea5t ng\u1edd.<\/p>\n

          3. X\u00e1c \u0111\u1ecbnh quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean r\u00f5 r\u00e0ng<\/h3>\n
            \n
          • T\u00ean th\u1ec3 hi\u1ec7n:<\/strong>D\u00f9ng ch\u1eef th\u01b0\u1eddng cho th\u1ec3 hi\u1ec7n (v\u00ed d\u1ee5: khachhang1<\/code>).<\/li>\n
          • T\u00ean ki\u1ec3u:<\/strong>D\u00f9ng ch\u1eef hoa cho l\u1edbp (v\u00ed d\u1ee5: KhachHang<\/code>).<\/li>\n
          • T\u00ean li\u00ean k\u1ebft:<\/strong>D\u00f9ng t\u00ean vai tr\u00f2 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong li\u00ean k\u1ebft (v\u00ed d\u1ee5: s\u1edf h\u1eefu<\/code>).<\/li>\n<\/ul>\n

            4. X\u00e1c minh theo c\u00e1c r\u00e0ng bu\u1ed9c<\/h3>\n

            Tr\u01b0\u1edbc khi ho\u00e0n t\u1ea5t s\u01a1 \u0111\u1ed3, h\u00e3y x\u00e1c minh r\u1eb1ng m\u1ecdi li\u00ean k\u1ebft \u0111\u1ec1u th\u1ecfa m\u00e3n c\u00e1c r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1. N\u1ebfu s\u01a1 \u0111\u1ed3 l\u1edbp n\u00f3i r\u1eb1ng m\u1ed9t QuanLyVien<\/code> ph\u1ea3i c\u00f3 \u00edt nh\u1ea5t m\u1ed9t NhanVienDuoi<\/code>, h\u00e3y \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng hi\u1ec3n th\u1ecb \u00edt nh\u1ea5t m\u1ed9t li\u00ean k\u1ebft cho m\u1ed7i th\u1ec3 hi\u1ec7n qu\u1ea3n l\u00fd vi\u00ean.<\/p>\n

            Chi ti\u1ebft k\u1ef9 thu\u1eadt: Chu\u1ea9n h\u00f3a v\u00e0 l\u01b0u tr\u1eef \ud83d\uddc4\ufe0f<\/h2>\n

            M\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf nh\u1ea5t c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 gi\u00fap hi\u1ec3u r\u00f5 v\u1ec1 chu\u1ea9n h\u00f3a. Khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1eb7c g\u1eedi qua m\u1ea1ng, \u0111\u1ed3 th\u1ecb \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd \u0111\u01b0\u1ee3c d\u00e0n ph\u1eb3ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng gi\u00fap h\u00ecnh dung r\u00f5 \u0111\u1ed3 th\u1ecb n\u00e0y.<\/p>\n

            X\u00e9t m\u1ed9t GioHangMuaSam<\/code>h\u1ec7 th\u1ed1ng. Gi\u1ecf h\u00e0ng ch\u1ee9a c\u00e1c m\u1eb7t h\u00e0ng. M\u1ed7i m\u1eb7t h\u00e0ng c\u00f3 m\u1ed9t s\u1ea3n ph\u1ea9m. N\u1ebfu b\u1ea1n chu\u1ea9n h\u00f3a \u0111i\u1ec1u n\u00e0y, m\u1ed1i quan h\u1ec7 gi\u1eefa gi\u1ecf h\u00e0ng v\u00e0 s\u1ea3n ph\u1ea9m ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0m r\u00f5 c\u00e1c tham chi\u1ebfu n\u00e0o l\u00e0 t\u1ea1m th\u1eddi v\u00e0 n\u00e0o l\u00e0 b\u1ec1n v\u1eefng. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 \u0111\u1ecbnh ngh\u0129a h\u1ee3p \u0111\u1ed3ng API.<\/p>\n

            H\u1ea1n ch\u1ebf v\u00e0 khi n\u00e0o n\u00ean tr\u00e1nh \ud83d\udcc9<\/h2>\n

            Kh\u00f4ng c\u00f3 k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e0o l\u00e0 ho\u00e0n h\u1ea3o. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf c\u1ee5 th\u1ec3 \u0111\u00f2i h\u1ecfi s\u1ef1 nh\u1eadn th\u1ee9c.<\/p>\n

              \n
            • Kh\u00f4ng c\u00f3 h\u00e0nh vi:<\/strong> Nh\u01b0 \u0111\u00e3 n\u00f3i, ch\u00fang kh\u00f4ng th\u1ec3 hi\u1ec3n th\u1ecb logic. Kh\u00f4ng d\u00f9ng ch\u00fang \u0111\u1ec3 gi\u1ea3i th\u00edch lu\u1ed3ng thu\u1eadt to\u00e1n.<\/li>\n
            • V\u1ea5n \u0111\u1ec1 v\u1ec1 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>M\u1ed9t h\u1ec7 th\u1ed1ng v\u1edbi h\u00e0ng tri\u1ec7u \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n. Ch\u00fang d\u00f9ng cho th\u1eddi \u0111i\u1ec3m thi\u1ebft k\u1ebf ho\u1eb7c c\u00e1c tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, ch\u1ee9 kh\u00f4ng d\u00f9ng cho vi\u1ec7c tr\u1ef1c quan h\u00f3a \u1edf quy m\u00f4 s\u1ea3n xu\u1ea5t.<\/li>\n
            • T\u1ea1o \u0111\u1ed9ng:<\/strong>Ch\u00fang g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c hi\u1ec3n th\u1ecb c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u1ea1o \u0111\u1ed9ng t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, tr\u1eeb khi b\u1ea1n m\u00f4 h\u00ecnh h\u00f3a r\u00f5 r\u00e0ng m\u1eabu thi\u1ebft k\u1ebf nh\u00e0 m\u00e1y (factory pattern).<\/li>\n
            • Qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n:<\/strong>N\u1ebfu l\u01b0\u1ee3c \u0111\u1ed3 thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean, vi\u1ec7c duy tr\u00ec s\u01a1 \u0111\u1ed3 tr\u1edf th\u00e0nh ho\u1ea1t \u0111\u1ed9ng t\u1ed1n k\u00e9m v\u1edbi l\u1ee3i \u00edch gi\u1ea3m d\u1ea7n.<\/li>\n<\/ul>\n

              Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p: M\u00f4 h\u00ecnh h\u00f3a m\u1ed9t giao d\u1ecbch ng\u00e2n h\u00e0ng \ud83c\udfe6<\/h2>\n

              \u0110\u1ec3 minh h\u1ecda gi\u00e1 tr\u1ecb, h\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng ng\u00e2n h\u00e0ng. Ch\u00fang ta c\u00f3 m\u1ed9t T\u00e0i kho\u1ea3n<\/code>, m\u1ed9t Giao d\u1ecbch<\/code>, v\u00e0 m\u1ed9t Ng\u01b0\u1eddi d\u00f9ng<\/code>.<\/p>\n

              S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp, ch\u00fang ta x\u00e1c \u0111\u1ecbnh r\u1eb1ng m\u1ed9t Ng\u01b0\u1eddi d\u00f9ng c\u00f3 nhi\u1ec1u T\u00e0i kho\u1ea3n. S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, ch\u00fang ta c\u00f3 th\u1ec3 tr\u1ef1c quan h\u00f3a tr\u1ea1ng th\u00e1i giao d\u1ecbch c\u1ee5 th\u1ec3.<\/p>\n

                \n
              • Th\u1ef1c th\u1ec3 1:<\/strong> user_Alice<\/code> (Lo\u1ea1i: Ng\u01b0\u1eddi d\u00f9ng)<\/li>\n
              • Th\u1ef1c th\u1ec3 2:<\/strong> acc_Checking<\/code> (Lo\u1ea1i: T\u00e0i kho\u1ea3n, S\u1ed1 d\u01b0: 500)<\/li>\n
              • Th\u1ef1c th\u1ec3 3:<\/strong> acc_Savings<\/code> (Lo\u1ea1i: T\u00e0i kho\u1ea3n, S\u1ed1 d\u01b0: 1000)<\/li>\n
              • Th\u1ef1c th\u1ec3 4:<\/strong> txn_Transfer1<\/code> (Lo\u1ea1i: Giao d\u1ecbch, S\u1ed1 ti\u1ec1n: 200)<\/li>\n<\/ul>\n

                C\u00e1c li\u00ean k\u1ebft cho th\u1ea5y r\u1eb1ng txn_Transfer1<\/code> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi t\u00e0i_kho\u1ea3n_thanh_to\u00e1n<\/code> (ngu\u1ed3n) v\u00e0 t\u00e0i_kho\u1ea3n_ti\u1ebft_ki\u1ec7m<\/code> (\u0111\u00edch). B\u1ea3n ch\u1ee5p h\u00ecnh \u1ea3nh tr\u1ef1c quan n\u00e0y x\u00e1c nh\u1eadn r\u1eb1ng logic giao d\u1ecbch tham chi\u1ebfu ch\u00ednh x\u00e1c hai t\u00e0i kho\u1ea3n kh\u00e1c nhau thu\u1ed9c c\u00f9ng m\u1ed9t ng\u01b0\u1eddi d\u00f9ng. N\u00f3 ng\u0103n ch\u1eb7n c\u00e1c l\u1ed7i x\u1ea3y ra khi m\u1ed9t giao d\u1ecbch c\u00f3 th\u1ec3 tham chi\u1ebfu sai \u0111\u1ebfn m\u1ed9t t\u00e0i kho\u1ea3n kh\u00f4ng thu\u1ed9c v\u1ec1 ng\u01b0\u1eddi d\u00f9ng.<\/p>\n

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

                S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML l\u00e0 c\u00f4ng c\u1ee5 chuy\u00ean bi\u1ec7t d\u00f9ng \u0111\u1ec3 ki\u1ec3m tra c\u1ea5u tr\u00fac. N\u00f3 kh\u00f4ng thay th\u1ebf cho s\u01a1 \u0111\u1ed3 l\u1edbp, s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 hay m\u00e1y tr\u1ea1ng th\u00e1i. Gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 n\u1eb1m \u1edf vi\u1ec7c x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/p>\n

                  \n
                • S\u1ef1 th\u1eadt:<\/strong> N\u00f3 th\u1ec3 hi\u1ec7n c\u00e1c th\u1ec3 hi\u1ec7n, ch\u1ee9 kh\u00f4ng ph\u1ea3i ki\u1ec3u d\u1eef li\u1ec7u.<\/li>\n
                • S\u1ef1 th\u1eadt:<\/strong> N\u00f3 l\u00e0 t\u0129nh, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u1ed9ng.<\/li>\n
                • S\u1ef1 th\u1eadt:<\/strong> N\u00f3 x\u00e1c minh t\u00ednh \u0111a d\u1ea1ng v\u00e0 c\u00e1c li\u00ean k\u1ebft.<\/li>\n
                • Suy ngh\u0129 sai l\u1ea7m:<\/strong> N\u00f3 kh\u00f4ng gi\u1ed1ng nh\u01b0 s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n
                • Suy ngh\u0129 sai l\u1ea7m:<\/strong> N\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec7n h\u00e0nh vi.<\/li>\n
                • Suy ngh\u0129 sai l\u1ea7m:<\/strong> N\u00f3 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng c\u1ea7n thi\u1ebft cho m\u1ecdi d\u1ef1 \u00e1n.<\/li>\n<\/ul>\n

                  B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 vai tr\u00f2 c\u1ee5 th\u1ec3 c\u1ee7a s\u01a1 \u0111\u1ed3 n\u00e0y, c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng n\u00f3 \u0111\u1ec3 ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i c\u1ea5u tr\u00fac v\u00e0 \u0111\u1ea3m b\u1ea3o m\u00f4 h\u00ecnh d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p v\u1edbi tri\u1ec3n khai. \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 cho \u0111\u1ed9 ch\u00ednh x\u00e1c, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u1ec3 t\u1ed5ng quan chung.<\/p>\n

                  Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 s\u1ef1 \u0111\u1ed3ng b\u1ed9 gi\u1eefa m\u00f4 h\u00ecnh v\u00e0 m\u00e3 ngu\u1ed3n \ud83d\udd04<\/h2>\n

                  M\u1ee5c ti\u00eau cu\u1ed1i c\u00f9ng c\u1ee7a m\u00f4 h\u00ecnh h\u00f3a l\u00e0 s\u1ef1 \u0111\u1ed3ng b\u1ed9 gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 m\u00e3 ngu\u1ed3n. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 c\u1ea7u n\u1ed1i gi\u1eefa c\u00e1c ki\u1ec3u tr\u1eebu t\u01b0\u1ee3ng v\u00e0 d\u1eef li\u1ec7u c\u1ee5 th\u1ec3. Khi m\u00e3 ngu\u1ed3n ch\u1ea1y, tr\u1ea1ng th\u00e1i h\u1ec7 th\u1ed1ng ph\u1ea3i kh\u1edbp v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c suy ra t\u1eeb thi\u1ebft k\u1ebf. N\u1ebfu ch\u00fang kh\u00e1c bi\u1ec7t, m\u00e3 ngu\u1ed3n c\u00f3 th\u1ec3 b\u1ecb l\u1ed7i. Vi\u1ec7c th\u01b0\u1eddng xuy\u00ean xem x\u00e9t c\u00e1c b\u1ea3n ch\u1ee5p n\u00e0y so v\u1edbi h\u1ec7 th\u1ed1ng \u0111ang ch\u1ea1y s\u1ebd gi\u00fap duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng d\u1eef li\u1ec7u cao v\u00e0 \u0111\u1ed9 tin c\u1eady h\u1ec7 th\u1ed1ng.<\/p>\n

                  H\u00e3y nh\u1edb, s\u01a1 \u0111\u1ed3 l\u00e0 c\u00f4ng c\u1ee5 giao ti\u1ebfp. N\u1ebfu m\u1ed9t s\u01a1 \u0111\u1ed3 khi\u1ebfn ng\u01b0\u1eddi \u0111\u1ecdc b\u1ed1i r\u1ed1i, th\u00ec n\u00f3 \u0111\u00e3 th\u1ea5t b\u1ea1i nhi\u1ec7m v\u1ee5. H\u00e3y gi\u1eef \u0111\u01a1n gi\u1ea3n, gi\u1eef ch\u00ednh x\u00e1c, v\u00e0 s\u1eed d\u1ee5ng n\u00f3 \u1edf nh\u1eefng n\u01a1i m\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ea5u tr\u00fac \u0111\u00f2i h\u1ecfi n\u00f3.<\/p>\n","protected":false},"excerpt":{"rendered":"

                  Hi\u1ec3u \u0111\u01b0\u1ee3c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m \u0111\u00f2i h\u1ecfi m\u1ed9t t\u1ea7m nh\u00ecn r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u t\u1ed3n t\u1ea1i t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) cung c\u1ea5p nhi\u1ec1u c\u00f4ng c\u1ee5 cho m\u1ee5c \u0111\u00edch n\u00e0y, nh\u01b0ng S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UMLth\u01b0\u1eddng b\u1ecb che l\u1ea5p b\u1edfi ng\u01b0\u1eddi anh em […]<\/p>\n","protected":false},"author":1,"featured_media":1515,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,45],"class_list":["post-1514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-object-diagram"],"yoast_head":"\nPh\u00e1 b\u1ecf nh\u1eefng hi\u1ec3u l\u1ea7m v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML: S\u1ef1 th\u1eadt so v\u1edbi Suy ngh\u0129 sai l\u1ea7m \ud83e\uddd0<\/title>\n<meta name=\"description\" content=\"H\u1ecdc hi\u1ec3u s\u1ef1 th\u1eadt v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML. 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