{"id":3360,"date":"2026-02-25T02:01:25","date_gmt":"2026-02-25T02:01:25","guid":{"rendered":"https:\/\/www.diagrams-ai.com\/vn\/the-complete-guide-to-uml-class-diagrams-concepts-notation-and-best-practices-2\/"},"modified":"2026-02-25T02:01:25","modified_gmt":"2026-02-25T02:01:25","slug":"the-complete-guide-to-uml-class-diagrams-concepts-notation-and-best-practices-2","status":"publish","type":"post","link":"https:\/\/www.diagrams-ai.com\/vn\/the-complete-guide-to-uml-class-diagrams-concepts-notation-and-best-practices-2\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp UML: C\u00e1c kh\u00e1i ni\u1ec7m, k\u00fd hi\u1ec7u v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t"},"content":{"rendered":"<h1>H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp UML: C\u00e1c kh\u00e1i ni\u1ec7m, k\u00fd hi\u1ec7u v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/h1>\n<p>Trong k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m, s\u01a1 \u0111\u1ed3 l\u1edbp Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) l\u00e0 n\u1ec1n t\u1ea3ng c\u1ed1t l\u00f5i trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. \u0110\u00e2y l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh m\u00f4 t\u1ea3 ki\u1ebfn tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, thao t\u00e1c (ph\u01b0\u01a1ng th\u1ee9c) v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. D\u00f9 b\u1ea1n l\u00e0 m\u1ed9t chuy\u00ean vi\u00ean ph\u00e2n t\u00edch kinh doanh m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng t\u1eeb g\u00f3c nh\u00ecn kinh doanh hay m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n x\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n, vi\u1ec7c hi\u1ec3u r\u00f5 s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu.<\/p>\n<h2>C\u00e1c kh\u00e1i ni\u1ec7m ch\u00ednh<\/h2>\n<p>Tr\u01b0\u1edbc khi v\u1ebd m\u1ed9t s\u01a1 \u0111\u1ed3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 n\u1ec1n t\u1ea3ng t\u1ea1o n\u00ean s\u01a1 \u0111\u1ed3 l\u1edbp.<\/p>\n<h3>1. L\u1edbp l\u00e0 g\u00ec?<\/h3>\n<p>L\u1edbp \u0111\u1ea1i di\u1ec7n cho m\u1ed9t m\u00f4 t\u1ea3 v\u1ec1 m\u1ed9t nh\u00f3m \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 vai tr\u00f2 t\u01b0\u01a1ng t\u1ef1 nhau trong h\u1ec7 th\u1ed1ng. N\u00f3 bao g\u1ed3m hai \u0111\u1eb7c tr\u01b0ng ch\u00ednh:<\/p>\n<ul>\n<li><strong>C\u00e1c \u0111\u1eb7c tr\u01b0ng c\u1ea5u tr\u00fac (Thu\u1ed9c t\u00ednh):<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp &#8220;bi\u1ebft&#8221;. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 m\u00f4 t\u1ea3 c\u00e1c \u0111\u1eb7c tr\u01b0ng t\u0129nh.<\/li>\n<li><strong>C\u00e1c \u0111\u1eb7c tr\u01b0ng h\u00e0nh vi (Thao t\u00e1c):<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp &#8220;c\u00f3 th\u1ec3 l\u00e0m&#8221;. Ch\u00fang m\u00f4 t\u1ea3 c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u1ed9ng v\u00e0 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau.<\/li>\n<\/ul>\n<h3>2. K\u00fd hi\u1ec7u l\u1edbp<\/h3>\n<p>K\u00fd hi\u1ec7u chu\u1ea9n UML bi\u1ec3u di\u1ec5n m\u1ed9t l\u1edbp d\u01b0\u1edbi d\u1ea1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh ba ph\u1ea7n ri\u00eang bi\u1ec7t:<\/p>\n<ol>\n<li><strong>T\u00ean l\u1edbp:<\/strong> N\u1eb1m \u1edf ph\u1ea7n \u0111\u1ea7u ti\u00ean. N\u1ebfu l\u00e0 l\u1edbp tr\u1eebu t\u01b0\u1ee3ng, t\u00ean s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb in nghi\u00eang.<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh l\u1edbp:<\/strong> \u0110\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf ph\u1ea7n th\u1ee9 hai. Ng\u1eef ph\u00e1p th\u01b0\u1eddng hi\u1ec3n th\u1ecb t\u00ean thu\u1ed9c t\u00ednh theo sau l\u00e0 d\u1ea5u hai ch\u1ea5m v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5, <code>b\u00e1n k\u00ednh : float<\/code>). Ch\u00fang t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c bi\u1ebfn th\u00e0nh vi\u00ean trong m\u00e3 ngu\u1ed3n.<\/li>\n<li><strong>C\u00e1c thao t\u00e1c l\u1edbp (Ph\u01b0\u01a1ng th\u1ee9c):<\/strong> \u0110\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf ph\u1ea7n th\u1ee9 ba. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c d\u1ecbch v\u1ee5 m\u00e0 l\u1edbp cung c\u1ea5p. Ki\u1ec3u tr\u1ea3 v\u1ec1 \u0111i theo sau k\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c (v\u00ed d\u1ee5, <code>getArea() : double<\/code>).<\/li>\n<\/ol>\n<h3>3. C\u00e1c m\u1ed1i quan h\u1ec7 l\u1edbp<\/h3>\n<p>C\u00e1c l\u1edbp hi\u1ebfm khi t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Ch\u00fang \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i th\u00f4ng qua c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee5 th\u1ec3, m\u1ed7i m\u1ed1i quan h\u1ec7 c\u00f3 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda ri\u00eang bi\u1ec7t:<\/p>\n<ul>\n<li><strong>K\u1ebf th\u1eeba (T\u1ed5ng qu\u00e1t h\u00f3a):<\/strong> \u0110\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 &#8220;l\u00e0 m\u1ed9t&#8221;. N\u00f3 gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a ph\u00e2n t\u00edch b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u ph\u00e2n lo\u1ea1i, trong \u0111\u00f3 c\u00e1c l\u1edbp con k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c t\u1eeb l\u1edbp cha.<em>K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha.<\/em><\/li>\n<li><strong>Li\u00ean k\u1ebft \u0111\u01a1n gi\u1ea3n:<\/strong> M\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa hai l\u1edbp \u0111\u1ed3ng c\u1ea5p.<em>K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n n\u1ed1i hai l\u1edbp.<\/em><\/li>\n<li><strong>T\u1ed5 h\u1ee3p:<\/strong>M\u1ed1i quan h\u1ec7 &#8220;thu\u1ed9c v\u1ec1&#8221; trong \u0111\u00f3 \u0111\u1ed1i t\u01b0\u1ee3ng con c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng cha (v\u00ed d\u1ee5: m\u1ed9t b\u00e1nh xe l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a xe h\u01a1i, nh\u01b0ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i ri\u00eang bi\u1ec7t).<em>K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh kim c\u01b0\u01a1ng tr\u1ed1ng \u1edf \u0111\u1ea7u h\u1ee3p th\u00e0nh.<\/em><\/li>\n<li><strong>Th\u00e0nh ph\u1ea7n:<\/strong>M\u1ed9t lo\u1ea1i t\u1ed5 h\u1ee3p m\u1ea1nh m\u1ebd trong \u0111\u00f3 c\u00e1c ph\u1ea7n b\u1ecb h\u1ee7y khi to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y (v\u00ed d\u1ee5: m\u1ed9t \u0111i\u1ec3m b\u00ean trong m\u1ed9t h\u00ecnh tr\u00f2n).<em>K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y \u1edf \u0111\u1ea7u h\u1ee3p th\u00e0nh.<\/em><\/li>\n<li><strong>Ph\u1ee5 thu\u1ed9c:<\/strong>X\u1ea3y ra khi thay \u0111\u1ed5i \u0111\u1ecbnh ngh\u0129a c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thay \u0111\u1ed5i \u1edf l\u1edbp kh\u00e1c.<em>K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t v\u1edbi m\u0169i t\u00ean h\u1edf.<\/em><\/li>\n<\/ul>\n<h2>Ph\u00e2n t\u00edch s\u00e2u: T\u00ednh kh\u1ea3 ki\u1ebfn v\u00e0 t\u00ednh \u0111a d\u1ea1ng<\/h2>\n<h3>T\u00ednh kh\u1ea3 ki\u1ebfn c\u1ee7a thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c<\/h3>\n<p>Trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, ki\u1ec3m so\u00e1t truy c\u1eadp l\u00e0 r\u1ea5t quan tr\u1ecdng. UML s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ec3 bi\u1ec3u th\u1ecb t\u00ednh kh\u1ea3 ki\u1ebfn:<\/p>\n<ul>\n<li><strong>+ (C\u00f4ng khai):<\/strong>C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o kh\u00e1c.<\/li>\n<li><strong>\u2013 (Ri\u00eang t\u01b0):<\/strong>Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp.<\/li>\n<li><strong># (B\u1ea3o v\u1ec7):<\/strong>C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp v\u00e0 c\u00e1c l\u1edbp k\u1ebf th\u1eeba.<\/li>\n<li><strong>~ (G\u00f3i):<\/strong>C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c l\u1edbp trong c\u00f9ng m\u1ed9t g\u00f3i.<\/li>\n<\/ul>\n<h3>T\u00ednh \u0111a d\u1ea1ng<\/h3>\n<p>T\u00ednh \u0111a d\u1ea1ng cho bi\u1ebft c\u00f3 bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed7i l\u1edbp tham gia v\u00e0o m\u1ed9t m\u1ed1i quan h\u1ec7:<\/p>\n<ul>\n<li><strong>1:<\/strong>\u0110\u00fang m\u1ed9t.<\/li>\n<li><strong>0..1:<\/strong>Kh\u00f4ng ho\u1eb7c m\u1ed9t.<\/li>\n<li><strong>*:<\/strong>Nhi\u1ec1u (0 ho\u1eb7c nhi\u1ec1u h\u01a1n).<\/li>\n<li><strong>1..*:<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u.<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5, trong m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u1ea1i h\u1ecdc, m\u1ed9t Sinh vi\u00ean c\u00f3 th\u1ec3 tham gia nhi\u1ec1u Kh\u00f3a h\u1ecdc (<code>0..*<\/code>), v\u00e0 nhi\u1ec1u Sinh vi\u00ean c\u00f3 th\u1ec3 \u0111\u0103ng k\u00fd m\u1ed9t Kh\u00f3a h\u1ecdc.<\/p>\n<h2>C\u00e1c nguy\u00ean t\u1eafc cho c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ec7u qu\u1ea3<\/h2>\n<p>Vi\u1ec7c t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng v\u00e0 h\u1eefu \u00edch \u0111\u00f2i h\u1ecfi tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc c\u1ee5 th\u1ec3 v\u1ec1 ph\u1ea1m vi v\u00e0 g\u00f3c nh\u00ecn.<\/p>\n<h3>1. Qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng<\/h3>\n<p>Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn ho\u1eb7c c\u00e1c l\u0129nh v\u1ef1c kinh doanh, h\u00e3y tr\u00e1nh c\u00e1m d\u1ed7 m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi th\u1ef1c th\u1ec3 tr\u00ean m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp duy nh\u1ea5t. Thay v\u00e0o \u0111\u00f3, <strong>s\u1eed d\u1ee5ng nhi\u1ec1u s\u01a1 \u0111\u1ed3 l\u1edbp<\/strong>. Chia h\u1ec7 th\u1ed1ng th\u00e0nh nhi\u1ec1u s\u01a1 \u0111\u1ed3 s\u1ebd gi\u00fap d\u1ec5 hi\u1ec3u h\u01a1n, v\u1edbi m\u1ed7i s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng con c\u1ee5 th\u1ec3.<\/p>\n<h3>2. G\u00f3c nh\u00ecn trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m<\/h3>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp n\u00ean ph\u00e1t tri\u1ec3n theo t\u1eebng giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n. H\u00e3y d\u1ea7n d\u1ea7n \u00e1p d\u1ee5ng ba g\u00f3c nh\u00ecn sau:<\/p>\n<ul>\n<li><strong>G\u00f3c nh\u00ecn kh\u00e1i ni\u1ec7m:<\/strong>M\u00f4 t\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 trong th\u1ebf gi\u1edbi th\u1ef1c. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y bi\u1ec3u di\u1ec5n c\u00e1c kh\u00e1i ni\u1ec7m trong l\u0129nh v\u1ef1c \u0111ang nghi\u00ean c\u1ee9u v\u00e0 th\u01b0\u1eddng kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o ng\u00f4n ng\u1eef c\u1ee5 th\u1ec3.<\/li>\n<li><strong>G\u00f3c nh\u00ecn \u0111\u1eb7c t\u1ea3:<\/strong>M\u00f4 t\u1ea3 c\u00e1c tr\u1eebu t\u01b0\u1ee3ng ph\u1ea7n m\u1ec1m ho\u1eb7c th\u00e0nh ph\u1ea7n c\u00f3 giao di\u1ec7n nh\u01b0ng kh\u00f4ng cam k\u1ebft v\u00e0o logic tri\u1ec3n khai c\u1ee5 th\u1ec3. T\u1eadp trung v\u00e0o &#8220;\u0111i\u1ec1u g\u00ec&#8221; ph\u1ea7n m\u1ec1m l\u00e0m, ch\u1ee9 kh\u00f4ng ph\u1ea3i &#8220;c\u00e1ch th\u1ee9c&#8221; l\u00e0m.<\/li>\n<li><strong>G\u00f3c nh\u00ecn tri\u1ec3n khai:<\/strong>M\u00f4 t\u1ea3 c\u00e1c tri\u1ec3n khai ph\u1ea7n m\u1ec1m c\u1ee5 th\u1ec3 trong m\u1ed9t c\u00f4ng ngh\u1ec7 v\u00e0 ng\u00f4n ng\u1eef \u0111\u00e3 ch\u1ecdn. M\u1ee9c \u0111\u1ed9 n\u00e0y chi ti\u1ebft c\u1ea5u tr\u00fac l\u1edbp th\u1ef1c t\u1ebf nh\u01b0 n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/li>\n<\/ul>\n<h3>3. \u0110\u1eb7t t\u00ean cho c\u00e1c m\u1ed1i quan h\u1ec7<\/h3>\n<p>T\u00ean m\u1ed1i quan h\u1ec7 t\u1ed1t s\u1ebd c\u00f3 \u00fd ngh\u0129a khi \u0111\u1ecdc to. V\u00ed d\u1ee5: &#8220;M\u1ed7i b\u1ea3ng t\u00ednh ch\u1ee9a m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng nh\u1ea5t \u0111\u1ecbnh c\u00e1c \u00f4.&#8221; S\u1eed d\u1ee5ng \u0111\u1ea7u m\u0169i t\u00ean nh\u1ecf \u0111\u1ec3 ch\u1ec9 h\u01b0\u1edbng \u0111\u1ecdc. H\u01a1n n\u1eefa, h\u00e3y x\u00e1c \u0111\u1ecbnh <strong>Vai tr\u00f2<\/strong>\u1edf hai \u0111\u1ea7u \u0111\u01b0\u1eddng n\u1ed1i li\u00ean k\u1ebft \u0111\u1ec3 m\u00f4 t\u1ea3 vai tr\u00f2 m\u00e0 m\u1ed9t l\u1edbp \u0111\u00f3ng (v\u00ed d\u1ee5: m\u1ed9t bi\u1ec3u th\u1ee9c \u0111\u00f3ng vai tr\u00f2 l\u00e0 <em>c\u00f4ng th\u1ee9c<\/em> cho m\u1ed9t \u00f4).<\/p>\n<h2>Danh s\u00e1ch ki\u1ec3m tra: Ki\u1ec3m tra s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n<\/h2>\n<p>Tr\u01b0\u1edbc khi ho\u00e0n thi\u1ec7n s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n, h\u00e3y \u0111i qua danh s\u00e1ch ki\u1ec3m tra n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 t\u00ednh d\u1ec5 \u0111\u1ecdc:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 ch\u00ednh x\u00e1c k\u00fd hi\u1ec7u:<\/strong>C\u00e1c l\u1edbp c\u00f3 \u0111\u01b0\u1ee3c chia th\u00e0nh ba ph\u1ea7n (T\u00ean, Thu\u1ed9c t\u00ednh, Thao t\u00e1c) kh\u00f4ng?<\/li>\n<li><strong>T\u00ednh h\u1ee3p l\u00fd c\u1ee7a m\u1ed1i quan h\u1ec7:<\/strong>C\u00e1c \u0111\u01b0\u1eddng k\u1ebf th\u1eeba c\u00f3 h\u01b0\u1edbng \u0111\u1ebfn cha kh\u00f4ng? C\u00e1c h\u00ecnh kim c\u01b0\u01a1ng c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf ph\u00eda th\u00e0nh ph\u1ea7n (to\u00e0n th\u1ec3) c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng li\u00ean k\u1ebft t\u1ed5ng h\u1ee3p\/k\u1ebft h\u1ee3p kh\u00f4ng?<\/li>\n<li><strong>Ki\u1ec3m tra t\u00ednh hi\u1ec3n th\u1ecb:<\/strong> B\u1ea1n \u0111\u00e3 \u00e1p d\u1ee5ng \u0111\u00fang <code>+<\/code>, <code>-<\/code>, <code>#<\/code>, ho\u1eb7c <code>~<\/code> v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c d\u1ef1a tr\u00ean nhu c\u1ea7u \u0111\u00f3ng g\u00f3i?<\/li>\n<li><strong>\u0110\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1ed9i s\u1ed1:<\/strong> C\u00f3 r\u00f5 r\u00e0ng v\u1ec1 c\u1ea5p \u0111\u1ed9 (v\u00ed d\u1ee5 nh\u01b0 <code>1..*<\/code>) cho m\u1ed7i li\u00ean k\u1ebft kh\u00f4ng?<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng:<\/strong> C\u00e1c m\u0169i t\u00ean c\u00f3 r\u00f5 r\u00e0ng ch\u1ec9 ra l\u1edbp n\u00e0o c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kia kh\u00f4ng?<\/li>\n<li><strong>Ki\u1ec3m tra \u0111\u1ed9 ph\u1ee9c t\u1ea1p:<\/strong> S\u01a1 \u0111\u1ed3 c\u00f3 qu\u00e1 t\u1ea3i kh\u00f4ng? N\u1ebfu v\u1eady, c\u00f3 n\u00ean chia th\u00e0nh nhi\u1ec1u s\u01a1 \u0111\u1ed3 kh\u00f4ng?<\/li>\n<li><strong>\u0110\u1ed3ng b\u1ed9 g\u00f3c nh\u00ecn:<\/strong> M\u1ee9c \u0111\u1ed9 chi ti\u1ebft c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi giai \u0111o\u1ea1n hi\u1ec7n t\u1ea1i c\u1ee7a b\u1ea1n (Kh\u00e1i ni\u1ec7m so v\u1edbi Tri\u1ec3n khai) kh\u00f4ng?<\/li>\n<\/ul>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp UML l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch n\u1eafm v\u1eefng c\u00e1c k\u00fd hi\u1ec7u v\u00e0 m\u1ed1i quan h\u1ec7 n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, c\u1ea7u n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c kh\u00e1i ni\u1ec7m kinh doanh v\u00e0 m\u00e3 k\u1ef9 thu\u1eadt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp UML: C\u00e1c kh\u00e1i ni\u1ec7m, k\u00fd hi\u1ec7u v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t Trong k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m, s\u01a1 \u0111\u1ed3 l\u1edbp Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) l\u00e0 n\u1ec1n t\u1ea3ng c\u1ed1t l\u00f5i trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. \u0110\u00e2y l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh m\u00f4 t\u1ea3 ki\u1ebfn tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, thao t\u00e1c (ph\u01b0\u01a1ng th\u1ee9c) v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. D\u00f9 b\u1ea1n l\u00e0 m\u1ed9t chuy\u00ean vi\u00ean ph\u00e2n t\u00edch kinh doanh m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng t\u1eeb g\u00f3c nh\u00ecn kinh doanh hay m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n x\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n, vi\u1ec7c hi\u1ec3u r\u00f5 s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu. C\u00e1c kh\u00e1i ni\u1ec7m ch\u00ednh Tr\u01b0\u1edbc khi v\u1ebd m\u1ed9t s\u01a1 \u0111\u1ed3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 n\u1ec1n t\u1ea3ng t\u1ea1o n\u00ean s\u01a1 \u0111\u1ed3 l\u1edbp. 1. L\u1edbp l\u00e0 g\u00ec? L\u1edbp \u0111\u1ea1i di\u1ec7n cho m\u1ed9t m\u00f4 t\u1ea3 v\u1ec1 m\u1ed9t nh\u00f3m \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 vai tr\u00f2 t\u01b0\u01a1ng t\u1ef1 nhau trong h\u1ec7 th\u1ed1ng. N\u00f3 bao g\u1ed3m hai \u0111\u1eb7c tr\u01b0ng ch\u00ednh: C\u00e1c \u0111\u1eb7c tr\u01b0ng c\u1ea5u tr\u00fac (Thu\u1ed9c t\u00ednh): Ch\u00fang x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp &#8220;bi\u1ebft&#8221;. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 m\u00f4 t\u1ea3 c\u00e1c \u0111\u1eb7c tr\u01b0ng t\u0129nh. C\u00e1c \u0111\u1eb7c tr\u01b0ng h\u00e0nh vi (Thao t\u00e1c): Ch\u00fang x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp &#8220;c\u00f3 th\u1ec3 l\u00e0m&#8221;. Ch\u00fang m\u00f4 t\u1ea3 c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u1ed9ng v\u00e0 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. 2. K\u00fd hi\u1ec7u l\u1edbp K\u00fd hi\u1ec7u chu\u1ea9n UML bi\u1ec3u di\u1ec5n m\u1ed9t l\u1edbp d\u01b0\u1edbi d\u1ea1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh ba ph\u1ea7n ri\u00eang bi\u1ec7t: T\u00ean l\u1edbp: N\u1eb1m \u1edf ph\u1ea7n \u0111\u1ea7u ti\u00ean. N\u1ebfu l\u00e0 l\u1edbp tr\u1eebu t\u01b0\u1ee3ng, t\u00ean s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb in nghi\u00eang. Thu\u1ed9c t\u00ednh l\u1edbp: \u0110\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf ph\u1ea7n th\u1ee9 hai. Ng\u1eef ph\u00e1p th\u01b0\u1eddng hi\u1ec3n th\u1ecb t\u00ean thu\u1ed9c t\u00ednh theo sau l\u00e0 d\u1ea5u hai ch\u1ea5m v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5, b\u00e1n k\u00ednh : float). Ch\u00fang t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c bi\u1ebfn th\u00e0nh vi\u00ean trong m\u00e3 ngu\u1ed3n. C\u00e1c thao t\u00e1c l\u1edbp (Ph\u01b0\u01a1ng th\u1ee9c): \u0110\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf ph\u1ea7n th\u1ee9 ba. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c d\u1ecbch v\u1ee5 m\u00e0 l\u1edbp cung c\u1ea5p. Ki\u1ec3u tr\u1ea3 v\u1ec1 \u0111i theo sau k\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c (v\u00ed d\u1ee5, getArea() : double). 3. C\u00e1c m\u1ed1i quan h\u1ec7 l\u1edbp C\u00e1c l\u1edbp hi\u1ebfm khi t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Ch\u00fang \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i th\u00f4ng qua c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee5 th\u1ec3, m\u1ed7i m\u1ed1i quan h\u1ec7 c\u00f3 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda ri\u00eang bi\u1ec7t: K\u1ebf th\u1eeba (T\u1ed5ng qu\u00e1t h\u00f3a): \u0110\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 &#8220;l\u00e0 m\u1ed9t&#8221;. N\u00f3 gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a ph\u00e2n t\u00edch b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u ph\u00e2n lo\u1ea1i, trong \u0111\u00f3 c\u00e1c l\u1edbp con k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c t\u1eeb l\u1edbp cha.K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha. Li\u00ean k\u1ebft \u0111\u01a1n gi\u1ea3n: M\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa hai l\u1edbp \u0111\u1ed3ng c\u1ea5p.K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n n\u1ed1i hai l\u1edbp. T\u1ed5 h\u1ee3p:M\u1ed1i quan h\u1ec7 &#8220;thu\u1ed9c v\u1ec1&#8221; trong \u0111\u00f3 \u0111\u1ed1i t\u01b0\u1ee3ng con c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng cha (v\u00ed d\u1ee5: m\u1ed9t b\u00e1nh xe l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a xe h\u01a1i, nh\u01b0ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i ri\u00eang bi\u1ec7t).K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh kim c\u01b0\u01a1ng tr\u1ed1ng \u1edf \u0111\u1ea7u h\u1ee3p th\u00e0nh. Th\u00e0nh ph\u1ea7n:M\u1ed9t lo\u1ea1i t\u1ed5 h\u1ee3p m\u1ea1nh m\u1ebd trong \u0111\u00f3 c\u00e1c ph\u1ea7n b\u1ecb h\u1ee7y khi to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y (v\u00ed d\u1ee5: m\u1ed9t \u0111i\u1ec3m b\u00ean trong m\u1ed9t h\u00ecnh tr\u00f2n).K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y \u1edf \u0111\u1ea7u h\u1ee3p th\u00e0nh. Ph\u1ee5 thu\u1ed9c:X\u1ea3y ra khi thay \u0111\u1ed5i \u0111\u1ecbnh ngh\u0129a c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thay \u0111\u1ed5i \u1edf l\u1edbp kh\u00e1c.K\u00fd hi\u1ec7u: M\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t v\u1edbi m\u0169i t\u00ean h\u1edf. Ph\u00e2n t\u00edch s\u00e2u: T\u00ednh kh\u1ea3 ki\u1ebfn v\u00e0 t\u00ednh \u0111a d\u1ea1ng T\u00ednh kh\u1ea3 ki\u1ebfn c\u1ee7a thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c Trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, ki\u1ec3m so\u00e1t truy c\u1eadp l\u00e0 r\u1ea5t quan tr\u1ecdng. UML s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ec3 bi\u1ec3u th\u1ecb t\u00ednh kh\u1ea3 ki\u1ebfn: + (C\u00f4ng khai):C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o kh\u00e1c. \u2013 (Ri\u00eang t\u01b0):Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp. # (B\u1ea3o v\u1ec7):C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp v\u00e0 c\u00e1c l\u1edbp k\u1ebf th\u1eeba. ~ (G\u00f3i):C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi c\u00e1c l\u1edbp trong c\u00f9ng m\u1ed9t g\u00f3i. T\u00ednh \u0111a d\u1ea1ng T\u00ednh \u0111a d\u1ea1ng cho bi\u1ebft c\u00f3 bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed7i l\u1edbp tham gia v\u00e0o m\u1ed9t m\u1ed1i quan h\u1ec7: 1:\u0110\u00fang m\u1ed9t. 0..1:Kh\u00f4ng ho\u1eb7c m\u1ed9t. *:Nhi\u1ec1u (0 ho\u1eb7c nhi\u1ec1u h\u01a1n). 1..*:M\u1ed9t ho\u1eb7c nhi\u1ec1u. V\u00ed d\u1ee5, trong m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u1ea1i h\u1ecdc, m\u1ed9t Sinh vi\u00ean c\u00f3 th\u1ec3 tham gia nhi\u1ec1u Kh\u00f3a h\u1ecdc (0..*), v\u00e0 nhi\u1ec1u Sinh vi\u00ean c\u00f3 th\u1ec3 \u0111\u0103ng k\u00fd m\u1ed9t Kh\u00f3a h\u1ecdc. C\u00e1c nguy\u00ean t\u1eafc cho c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ec7u qu\u1ea3 Vi\u1ec7c t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng v\u00e0 h\u1eefu \u00edch \u0111\u00f2i h\u1ecfi tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc c\u1ee5 th\u1ec3 v\u1ec1 ph\u1ea1m vi v\u00e0 g\u00f3c nh\u00ecn. 1. Qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn ho\u1eb7c c\u00e1c l\u0129nh v\u1ef1c kinh doanh, h\u00e3y tr\u00e1nh c\u00e1m d\u1ed7 m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi th\u1ef1c th\u1ec3 tr\u00ean m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp duy nh\u1ea5t. Thay v\u00e0o \u0111\u00f3, s\u1eed d\u1ee5ng nhi\u1ec1u s\u01a1 \u0111\u1ed3 l\u1edbp. Chia h\u1ec7 th\u1ed1ng th\u00e0nh nhi\u1ec1u s\u01a1 \u0111\u1ed3 s\u1ebd gi\u00fap d\u1ec5 hi\u1ec3u h\u01a1n, v\u1edbi m\u1ed7i s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng con c\u1ee5 th\u1ec3. 2. G\u00f3c nh\u00ecn trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m S\u01a1 \u0111\u1ed3 l\u1edbp n\u00ean ph\u00e1t tri\u1ec3n theo t\u1eebng giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n. H\u00e3y d\u1ea7n d\u1ea7n \u00e1p d\u1ee5ng ba g\u00f3c nh\u00ecn sau: G\u00f3c nh\u00ecn kh\u00e1i ni\u1ec7m:M\u00f4 t\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 trong th\u1ebf gi\u1edbi th\u1ef1c. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y bi\u1ec3u di\u1ec5n c\u00e1c kh\u00e1i ni\u1ec7m trong l\u0129nh v\u1ef1c \u0111ang nghi\u00ean c\u1ee9u v\u00e0 th\u01b0\u1eddng kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o ng\u00f4n ng\u1eef c\u1ee5 th\u1ec3. G\u00f3c nh\u00ecn \u0111\u1eb7c t\u1ea3:M\u00f4 t\u1ea3 c\u00e1c tr\u1eebu t\u01b0\u1ee3ng ph\u1ea7n m\u1ec1m ho\u1eb7c th\u00e0nh ph\u1ea7n c\u00f3 giao di\u1ec7n nh\u01b0ng kh\u00f4ng cam k\u1ebft v\u00e0o logic tri\u1ec3n khai c\u1ee5 th\u1ec3. T\u1eadp trung v\u00e0o<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 l\u1edbp UML: H\u01b0\u1edbng d\u1eabn v\u00e0 b\u00e0i h\u1ecdc to\u00e0n di\u1ec7n","_yoast_wpseo_metadesc":"N\u1eafm v\u1eefng s\u01a1 \u0111\u1ed3 l\u1edbp UML. 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