{"id":3977,"date":"2022-02-08T05:46:57","date_gmt":"2022-02-08T05:46:57","guid":{"rendered":"https:\/\/www.cybermedian.com\/vn\/?p=3977"},"modified":"2025-02-07T09:50:38","modified_gmt":"2025-02-07T01:50:38","slug":"a-comprehensive-guide-to-uml-class-diagram","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/vn\/a-comprehensive-guide-to-uml-class-diagram\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp UML"},"content":{"rendered":"<p> <a href=\"https:\/\/www.omg.org\/spec\/UML\/2.5.1\/About-UML\/\">Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t<\/a> (<a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/\">UML<\/a>) l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a ph\u00e1t tri\u1ec3n \u0111a m\u1ee5c \u0111\u00edch trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ti\u00eau chu\u1ea9n \u0111\u1ec3 h\u00ecnh dung thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. \u0110\u1ed9ng l\u1ef1c ban \u0111\u1ea7u \u0111\u1ec3 t\u1ea1o ra UML l\u00e0 mong mu\u1ed1n ti\u00eau chu\u1ea9n h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u kh\u00e1c nhau v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m. Trong UML, s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 m\u1ed9t trong <a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\">s\u00e1u lo\u1ea1i s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac<\/a>. S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 c\u01a1 s\u1edf c\u1ee7a qu\u00e1 tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 m\u00f4 h\u00ecnh h\u00f3a c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<p><strong>S\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac<\/strong> cho th\u1ea5y c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1c ph\u1ea7n c\u1ee7a n\u00f3 \u1edf c\u00e1c m\u1ee9c \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c hi\u1ec7n kh\u00e1c nhau v\u00e0 c\u00e1ch ch\u00fang li\u00ean quan \u0111\u1ebfn nhau. C\u00e1c ph\u1ea7n t\u1eed trong m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac \u0111\u1ea1i di\u1ec7n cho c\u00e1c kh\u00e1i ni\u1ec7m c\u00f3 \u00fd ngh\u0129a c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng, v\u00e0 c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng, th\u1ebf gi\u1edbi th\u1ef1c v\u00e0 kh\u00e1i ni\u1ec7m th\u1ef1c hi\u1ec7n, c\u00f3 b\u1ea3y lo\u1ea1i s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac nh\u01b0 sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#class-diagram\">S\u01a1 \u0111\u1ed3 l\u1edbp<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#component-diagram\">S\u01a1 \u0111\u1ed3 th\u00e0nh ph\u1ea7n<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#deployment-diagram\">S\u01a1 \u0111\u1ed3 tri\u1ec3n khai<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#object-diagram\">S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#package-diagram\">S\u01a1 \u0111\u1ed3 g\u00f3i<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#composite-structure-diagram\">S\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u1ed5ng h\u1ee3p<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/#profile-diagram\">S\u01a1 \u0111\u1ed3 h\u1ed3 s\u01a1<\/a><\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<p><img alt=\"Overview of the 14 UML Diagram Types\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/01-uml-diagram-types.png\"\/><\/p>\n<h3>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 g\u00ec?<\/h3>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp trong Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp c\u1ee7a n\u00f3, c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang, c\u00e1c ho\u1ea1t \u0111\u1ed9ng (ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c) v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng.<span style=\"font-size: 1.125rem\">M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 m\u1ed9t b\u1ea3n thi\u1ebft k\u1ebf cho m\u1ed9t h\u1ec7 th\u1ed1ng ho\u1eb7c ti\u1ec3u h\u1ec7 th\u1ed1ng. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ea1o n\u00ean h\u1ec7 th\u1ed1ng, hi\u1ec3n th\u1ecb c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 m\u00f4 t\u1ea3 vai tr\u00f2 c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y v\u00e0 c\u00e1c d\u1ecbch v\u1ee5 m\u00e0 ch\u00fang cung c\u1ea5p.<\/span><\/p>\n<h2>Ngu\u1ed3n g\u1ed1c c\u1ee7a UML<\/h2>\n<p>M\u1ee5c ti\u00eau c\u1ee7a UML l\u00e0 cung c\u1ea5p m\u1ed9t k\u00fd hi\u1ec7u ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi t\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 \u0111\u1ec3 ch\u1ecdn l\u1ecdc v\u00e0 t\u00edch h\u1ee3p c\u00e1c y\u1ebfu t\u1ed1 t\u1ed1t nh\u1ea5t c\u1ee7a c\u00e1c k\u00fd hi\u1ec7u ti\u1ec1n th\u00e2n. UML \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho m\u1ed9t lo\u1ea1t c\u00e1c \u1ee9ng d\u1ee5ng. Do \u0111\u00f3, n\u00f3 cung c\u1ea5p c\u00e1c c\u1ea5u tr\u00fac cho m\u1ed9t lo\u1ea1t c\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng (v\u00ed d\u1ee5: h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, ph\u00e2n t\u00edch, thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u00e0 tri\u1ec3n khai).<\/p>\n<p>UML l\u00e0 m\u1ed9t k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh t\u1eeb s\u1ef1 th\u1ed1ng nh\u1ea5t c\u1ee7a OMT t\u1eeb<\/p>\n<ol>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Object-modeling_technique\" rel=\"noopener\" target=\"_blank\">K\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed1i t\u01b0\u1ee3ng OMT<\/a>\u00a0[<a href=\"https:\/\/en.wikipedia.org\/wiki\/James_Rumbaugh\" rel=\"noopener\" target=\"_blank\">James Rumbaugh<\/a> 1991] \u2013 l\u00e0 t\u1ed1t nh\u1ea5t cho ph\u00e2n t\u00edch v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng th\u00f4ng tin t\u1eadp trung v\u00e0o d\u1eef li\u1ec7u.<\/li>\n<li>Booch [<a href=\"https:\/\/en.wikipedia.org\/wiki\/Grady_Booch\" rel=\"noopener\" target=\"_blank\">Grady Booch<\/a> 1994] \u2013 l\u00e0 xu\u1ea5t s\u1eafc cho thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai. Grady Booch \u0111\u00e3 l\u00e0m vi\u1ec7c r\u1ed9ng r\u00e3i v\u1edbi <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ada_(programming_language)\" rel=\"noopener\" target=\"_blank\">Ada<\/a> ng\u00f4n ng\u1eef, v\u00e0 \u0111\u00e3 l\u00e0 m\u1ed9t nh\u00e2n t\u1ed1 ch\u00ednh trong s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c k\u1ef9 thu\u1eadt h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng cho ng\u00f4n ng\u1eef n\u00e0y. M\u1eb7c d\u00f9 ph\u01b0\u01a1ng ph\u00e1p Booch r\u1ea5t m\u1ea1nh, nh\u01b0ng k\u00fd hi\u1ec7u c\u1ee7a n\u00f3 kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u00f3n nh\u1eadn t\u1ed1t (nhi\u1ec1u h\u00ecnh m\u00e2y chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c m\u00f4 h\u00ecnh c\u1ee7a \u00f4ng \u2013 kh\u00f4ng \u0111\u01b0\u1ee3c g\u1ecdn g\u00e0ng l\u1eafm)<\/li>\n<li>OOSE (K\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng [<a href=\"https:\/\/en.wikipedia.org\/wiki\/Ivar_Jacobson\" rel=\"noopener\" target=\"_blank\">Ivar Jacobson<\/a> 1992]) \u2013 c\u00f3 m\u1ed9t m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng. C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt m\u1ea1nh m\u1ebd \u0111\u1ec3 hi\u1ec3u h\u00e0nh vi c\u1ee7a to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng (m\u1ed9t l\u0129nh v\u1ef1c m\u00e0 OO truy\u1ec1n th\u1ed1ng \u0111\u00e3 y\u1ebfu).<\/li>\n<\/ol>\n<p>N\u0103m 1994, Jim Rumbaugh, ng\u01b0\u1eddi s\u00e1ng t\u1ea1o OMT, \u0111\u00e3 g\u00e2y s\u1ed1c cho th\u1ebf gi\u1edbi ph\u1ea7n m\u1ec1m khi \u00f4ng r\u1eddi General Electric v\u00e0 gia nh\u1eadp Grady Booch t\u1ea1i Rational Corp. M\u1ee5c ti\u00eau c\u1ee7a s\u1ef1 h\u1ee3p t\u00e1c l\u00e0 \u0111\u1ec3 h\u1ee3p nh\u1ea5t c\u00e1c \u00fd t\u01b0\u1edfng c\u1ee7a h\u1ecd th\u00e0nh m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p duy nh\u1ea5t, th\u1ed1ng nh\u1ea5t (t\u00ean l\u00e0m vi\u1ec7c cho ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c s\u1ef1 l\u00e0 \u201cPh\u01b0\u01a1ng ph\u00e1p th\u1ed1ng nh\u1ea5t\u201d).<\/p>\n<p><img alt=\"UML History\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/01-uml-history.png\"\/><\/p>\n<h3>M\u1ee5c \u0111\u00edch c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp<\/h3>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp h\u1eefu \u00edch trong nhi\u1ec1u giai \u0111o\u1ea1n thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. Trong giai \u0111o\u1ea1n ph\u00e2n t\u00edch, s\u01a1 \u0111\u1ed3 l\u1edbp c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n hi\u1ec3u c\u00e1c y\u00eau c\u1ea7u c\u1ee7a mi\u1ec1n v\u1ea5n \u0111\u1ec1 v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3. Trong c\u00e1c d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u01b0\u1ee3c t\u1ea1o ra trong c\u00e1c giai \u0111o\u1ea1n \u0111\u1ea7u c\u1ee7a d\u1ef1 \u00e1n ch\u1ee9a c\u00e1c l\u1edbp th\u01b0\u1eddng \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh c\u00e1c l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea7n m\u1ec1m th\u1ef1c t\u1ebf khi vi\u1ebft m\u00e3.<\/p>\n<p>Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 tinh ch\u1ec9nh c\u00e1c m\u00f4 h\u00ecnh ph\u00e2n t\u00edch v\u00e0 kh\u00e1i ni\u1ec7m ban \u0111\u1ea7u th\u00e0nh c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng, giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, c\u00e1c th\u1ef1c hi\u1ec7n logic, v\u00e0 nhi\u1ec1u h\u01a1n n\u1eefa.<\/p>\n<p><span style=\"font-size: 1.125rem\">S\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng v\u00ec ch\u00fang l\u00e0 c\u00e1c s\u01a1 \u0111\u1ed3 UML duy nh\u1ea5t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp v\u00e0o c\u00e1c ng\u00f4n ng\u1eef h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Trong giai \u0111o\u1ea1n th\u1ef1c hi\u1ec7n c\u1ee7a chu k\u1ef3 ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i c\u00e1c m\u00f4 h\u00ecnh th\u00e0nh m\u00e3 v\u00e0 m\u00e3 th\u00e0nh c\u00e1c m\u00f4 h\u00ecnh.<\/span><\/p>\n<section data-magellan-target=\"class-notation\" id=\"class-notation\">\n<h2>V\u00ed d\u1ee5 v\u1ec1 l\u1edbp<\/h2>\n<p>M\u1ed9t con ch\u00f3 c\u00f3 c\u00e1c tr\u1ea1ng th\u00e1i \u2013 m\u00e0u s\u1eafc, t\u00ean, gi\u1ed1ng c\u0169ng nh\u01b0 c\u00e1c h\u00e0nh vi &#8211; v\u1eaby \u0111u\u00f4i, s\u1ee7a, \u0103n. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp.<\/p>\n<p>\u00a0<\/p>\n<p id=\"FQmffwu\"><img alt=\"\" class=\"alignnone size-full wp-image-8970\" decoding=\"async\" height=\"444\" loading=\"lazy\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd4f9b3aa.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd4f9b3aa.png 630w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd4f9b3aa-300x211.png 300w\" width=\"630\"\/><\/p>\n<h2>K\u00fd hi\u1ec7u l\u1edbp UML<\/h2>\n<p>M\u1ed9t l\u1edbp \u0111\u1ea1i di\u1ec7n cho m\u1ed9t kh\u00e1i ni\u1ec7m bao g\u1ed3m tr\u1ea1ng th\u00e1i (<b>thu\u1ed9c t\u00ednh<\/b>) v\u00e0 h\u00e0nh vi (<b>c\u00e1c ho\u1ea1t \u0111\u1ed9ng<\/b>). M\u1ed7i thu\u1ed9c t\u00ednh c\u00f3 m\u1ed9t ki\u1ec3u. M\u1ed7i <b>ho\u1ea1t \u0111\u1ed9ng<\/b>\u00a0has a\u00a0<b>ch\u1eef k\u00fd<\/b>.\u00a0<i>T\u00ean l\u1edbp l\u00e0 <b>th\u00f4ng tin b\u1eaft bu\u1ed9c duy nh\u1ea5t<\/b><\/i>.<\/p>\n<h4><\/h4>\n<p id=\"iawxUlV\"><img alt=\"\" class=\"alignnone size-full wp-image-8973\" decoding=\"async\" height=\"162\" loading=\"lazy\" sizes=\"auto, (max-width: 492px) 100vw, 492px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd6d31d5b.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd6d31d5b.png 492w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd6d31d5b-300x99.png 300w\" width=\"492\"\/><\/p>\n<h4><\/h4>\n<div class=\"space-gap\"><\/div>\n<p><b>T\u00ean l\u1edbp:<\/b><\/p>\n<ul>\n<li>T\u00ean c\u1ee7a l\u1edbp xu\u1ea5t hi\u1ec7n trong ph\u00e2n v\u00f9ng \u0111\u1ea7u ti\u00ean.<\/li>\n<\/ul>\n<p><b>Thu\u1ed9c t\u00ednh l\u1edbp:<\/b><\/p>\n<ul>\n<li>C\u00e1c thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong ph\u00e2n v\u00f9ng th\u1ee9 hai.<\/li>\n<li>Ki\u1ec3u thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb sau d\u1ea5u hai ch\u1ea5m.<\/li>\n<li>C\u00e1c thu\u1ed9c t\u00ednh \u00e1nh x\u1ea1 v\u00e0o c\u00e1c bi\u1ebfn th\u00e0nh vi\u00ean (c\u00e1c th\u00e0nh vi\u00ean d\u1eef li\u1ec7u) trong m\u00e3.<\/li>\n<\/ul>\n<p><b>C\u00e1c ho\u1ea1t \u0111\u1ed9ng l\u1edbp (Ph\u01b0\u01a1ng th\u1ee9c):<\/b><\/p>\n<ul>\n<li>C\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong ph\u00e2n v\u00f9ng th\u1ee9 ba. Ch\u00fang l\u00e0 c\u00e1c d\u1ecbch v\u1ee5 m\u00e0 l\u1edbp cung c\u1ea5p.<\/li>\n<li>Ki\u1ec3u tr\u1ea3 v\u1ec1 c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb sau d\u1ea5u hai ch\u1ea5m \u1edf cu\u1ed1i ch\u1eef k\u00fd ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n<li>Ki\u1ec3u tr\u1ea3 v\u1ec1 c\u1ee7a c\u00e1c tham s\u1ed1 ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb sau d\u1ea5u hai ch\u1ea5m theo sau t\u00ean tham s\u1ed1. C\u00e1c ho\u1ea1t \u0111\u1ed9ng \u00e1nh x\u1ea1 v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u1edbp trong m\u00e3<\/li>\n<\/ul>\n<h4><\/h4>\n<p id=\"vZVmflF\"><img alt=\"\" class=\"alignnone size-full wp-image-8974\" decoding=\"async\" height=\"150\" loading=\"lazy\" sizes=\"auto, (max-width: 521px) 100vw, 521px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd7bde62d.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd7bde62d.png 521w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd7bde62d-300x86.png 300w\" width=\"521\"\/><\/p>\n<\/section>\n<section data-magellan-target=\"class-relationships\" id=\"class-relationships\">\n<h2>M\u1ed1i quan h\u1ec7 l\u1edbp<\/h2>\n<p>M\u1ed9t l\u1edbp c\u00f3 th\u1ec3 tham gia v\u00e0o m\u1ed9t ho\u1eb7c nhi\u1ec1u m\u1ed1i quan h\u1ec7 v\u1edbi c\u00e1c l\u1edbp kh\u00e1c. M\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t trong c\u00e1c lo\u1ea1i sau: (Tham kh\u1ea3o h\u00ecnh b\u00ean ph\u1ea3i \u0111\u1ec3 bi\u1ebft bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7).<\/p>\n<div class=\"editions\">\n<table class=\"stack\">\n<tbody>\n<tr>\n<th>Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\n<th width=\"250\">Bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda<\/th>\n<\/tr>\n<tr>\n<td><strong>K\u1ebf th\u1eeba<\/strong> (ho\u1eb7c T\u1ed5ng qu\u00e1t):<\/p>\n<ul>\n<li>\u0110\u1ea1i di\u1ec7n cho m\u1ed9t m\u1ed1i quan h\u1ec7 \u201cl\u00e0 m\u1ed9t\u201d.<\/li>\n<li>T\u00ean l\u1edbp tr\u1eebu t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1eb1ng ch\u1eef nghi\u00eang.<\/li>\n<li>SubClass1 v\u00e0 SubClass2 l\u00e0 c\u00e1c chuy\u00ean ng\u00e0nh c\u1ee7a L\u1edbp Cha.<\/li>\n<li>M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1eb7c v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean r\u1ed7ng ch\u1ec9 t\u1eeb l\u1edbp con \u0111\u1ebfn l\u1edbp cha<\/li>\n<\/ul>\n<\/td>\n<td><img alt=\"Inheritance (or Generalization)\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/08-inheritance-in-class-diagram.png\"\/><\/td>\n<\/tr>\n<tr>\n<td><strong>Li\u00ean k\u1ebft \u0111\u01a1n gi\u1ea3n<\/strong>:<\/p>\n<ul>\n<li>M\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa hai l\u1edbp ngang h\u00e0ng.<\/li>\n<li>C\u00f3 m\u1ed9t li\u00ean k\u1ebft gi\u1eefa Class1 v\u00e0 Class2<\/li>\n<li>M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng k\u1ebft n\u1ed1i hai l\u1edbp<\/li>\n<\/ul>\n<\/td>\n<td><img alt=\"Simple association\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/04-simple-association.png\"\/><\/td>\n<\/tr>\n<tr>\n<td><strong>T\u1eadp h\u1ee3p<\/strong>:<\/p>\n<p>M\u1ed9t lo\u1ea1i li\u00ean k\u1ebft \u0111\u1eb7c bi\u1ec7t. N\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t m\u1ed1i quan h\u1ec7 \u201cph\u1ea7n c\u1ee7a\u201d.<\/p>\n<ul>\n<li>Class2 l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a Class1.<\/li>\n<li>Nhi\u1ec1u th\u1ec3 hi\u1ec7n (\u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u b\u1eb1ng *) c\u1ee7a Class2 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi Class1.<\/li>\n<li>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a Class1 v\u00e0 Class2 c\u00f3 v\u00f2ng \u0111\u1eddi ri\u00eang bi\u1ec7t.<\/li>\n<li>M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1eb7c v\u1edbi m\u1ed9t h\u00ecnh thoi kh\u00f4ng \u0111\u1ea7y \u1edf \u0111\u1ea7u li\u00ean k\u1ebft k\u1ebft n\u1ed1i v\u1edbi l\u1edbp t\u1ed5ng h\u1ee3p<\/li>\n<\/ul>\n<\/td>\n<td><img alt=\"Aggregation\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/05-aggregation.png\"\/><\/td>\n<\/tr>\n<tr>\n<td><strong>Th\u00e0nh ph\u1ea7n<\/strong>:<\/p>\n<p>M\u1ed9t lo\u1ea1i t\u1eadp h\u1ee3p \u0111\u1eb7c bi\u1ec7t m\u00e0 c\u00e1c ph\u1ea7n b\u1ecb ph\u00e1 h\u1ee7y khi to\u00e0n b\u1ed9 b\u1ecb ph\u00e1 h\u1ee7y.<\/p>\n<ul>\n<li>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a Class2 s\u1ed1ng v\u00e0 ch\u1ebft c\u00f9ng v\u1edbi Class1.<\/li>\n<li>Class2 kh\u00f4ng th\u1ec3 \u0111\u1ee9ng m\u1ed9t m\u00ecnh.<\/li>\n<li>M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1eb7c v\u1edbi m\u1ed9t h\u00ecnh thoi \u0111\u1ea7y \u1edf \u0111\u1ea7u li\u00ean k\u1ebft k\u1ebft n\u1ed1i v\u1edbi l\u1edbp t\u1ed5ng h\u1ee3p<\/li>\n<\/ul>\n<\/td>\n<td><img decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/06-composition.png\"\/><\/td>\n<\/tr>\n<tr>\n<td><strong>Ph\u1ee5 thu\u1ed9c<\/strong>:<\/p>\n<ul>\n<li>T\u1ed3n t\u1ea1i gi\u1eefa hai l\u1edbp n\u1ebfu s\u1ef1 thay \u0111\u1ed5i trong \u0111\u1ecbnh ngh\u0129a c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 thay \u0111\u1ed5i cho l\u1edbp kia (nh\u01b0ng kh\u00f4ng ph\u1ea3i theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i).<\/li>\n<li>Class1 ph\u1ee5 thu\u1ed9c v\u00e0o Class2<\/li>\n<li>M\u1ed9t \u0111\u01b0\u1eddng g\u1ea1ch ch\u00e9o v\u1edbi m\u1ed9t m\u0169i t\u00ean m\u1edf<\/li>\n<\/ul>\n<\/td>\n<td><img alt=\"Dependency\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/07-dependency.png\"\/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section data-magellan-target=\"relationship-names\" id=\"relationship-names\">\n<h3>T\u00ean m\u1ed1i quan h\u1ec7<\/h3>\n<ul>\n<li>T\u00ean c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c vi\u1ebft \u1edf gi\u1eefa \u0111\u01b0\u1eddng li\u00ean k\u1ebft.<\/li>\n<li>T\u00ean quan h\u1ec7 t\u1ed1t c\u00f3 \u00fd ngh\u0129a khi b\u1ea1n \u0111\u1ecdc ch\u00fang to l\u00ean:\n<ul>\n<li>\u201cM\u1ed7i b\u1ea3ng t\u00ednh\u00a0<strong>ch\u1ee9a<\/strong>\u00a0m\u1ed9t s\u1ed1 \u00f4\u201d,<\/li>\n<li>\u201cm\u1ed9t bi\u1ec3u th\u1ee9c\u00a0<strong>\u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 th\u00e0nh<\/strong>\u00a0m\u1ed9t gi\u00e1 tr\u1ecb\u201d<\/li>\n<\/ul>\n<\/li>\n<li>Ch\u00fang th\u01b0\u1eddng c\u00f3 m\u1ed9t\u00a0<strong>\u0111\u1ea7u m\u0169i t\u00ean nh\u1ecf \u0111\u1ec3 ch\u1ec9 ra h\u01b0\u1edbng<\/strong>\u00a0m\u00e0 b\u1ea1n n\u00ean \u0111\u1ecdc m\u1ed1i quan h\u1ec7, v\u00ed d\u1ee5: bi\u1ec3u th\u1ee9c \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 th\u00e0nh gi\u00e1 tr\u1ecb, nh\u01b0ng gi\u00e1 tr\u1ecb kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 th\u00e0nh bi\u1ec3u th\u1ee9c.<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<p id=\"BsByGEI\"><img alt=\"\" class=\"alignnone size-full wp-image-8975\" decoding=\"async\" height=\"314\" loading=\"lazy\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd9bda59a.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd9bda59a.png 340w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216dd9bda59a-300x277.png 300w\" width=\"340\"\/><\/p>\n<\/section>\n<section data-magellan-target=\"relationship-roles\" id=\"relationship-roles\">\n<h3>M\u1ed1i quan h\u1ec7 \u2013 Vai tr\u00f2<\/h3>\n<div class=\"space-gap-small\"><\/div>\n<ul>\n<li>M\u1ed9t vai tr\u00f2 l\u00e0 m\u1ed9t m\u1ee5c \u0111\u00edch c\u00f3 h\u01b0\u1edbng c\u1ee7a m\u1ed9t li\u00ean k\u1ebft.<\/li>\n<li>C\u00e1c vai tr\u00f2 \u0111\u01b0\u1ee3c vi\u1ebft \u1edf cu\u1ed1i m\u1ed9t \u0111\u01b0\u1eddng li\u00ean k\u1ebft v\u00e0 m\u00f4 t\u1ea3 m\u1ee5c \u0111\u00edch m\u00e0 l\u1edbp \u0111\u00f3 \u0111\u1ea3m nh\u1eadn trong m\u1ed1i quan h\u1ec7.\n<ul>\n<li>V\u00ed d\u1ee5: M\u1ed9t \u00f4 li\u00ean quan \u0111\u1ebfn m\u1ed9t bi\u1ec3u th\u1ee9c. B\u1ea3n ch\u1ea5t c\u1ee7a m\u1ed1i quan h\u1ec7 l\u00e0 bi\u1ec3u th\u1ee9c l\u00e0\u00a0<strong>c\u00f4ng th\u1ee9c<\/strong>\u00a0c\u1ee7a \u00f4.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/section>\n<section data-magellan-target=\"navigability\" id=\"navigability\">\n<h3>Kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng<\/h3>\n<p>C\u00e1c m\u0169i t\u00ean ch\u1ec9 ra li\u1ec7u, v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n tham gia v\u00e0o m\u1ed9t m\u1ed1i quan h\u1ec7, c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c c\u00f3 li\u00ean quan \u0111\u1ebfn n\u00f3 hay kh\u00f4ng.<\/p>\n<p>S\u01a1 \u0111\u1ed3 tr\u00ean cho th\u1ea5y r\u1eb1ng,<\/p>\n<ul>\n<li>V\u1edbi m\u1ed9t b\u1ea3ng t\u00ednh, ch\u00fang ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ea5t c\u1ea3 c\u00e1c \u00f4 m\u00e0 n\u00f3 ch\u1ee9a, nh\u01b0ng r\u1eb1ng\n<ul>\n<li>ch\u00fang ta kh\u00f4ng th\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1eeb m\u1ed9t \u00f4 trong b\u1ea3ng t\u00ednh n\u00e0o n\u00f3 \u0111\u01b0\u1ee3c ch\u1ee9a.<\/li>\n<\/ul>\n<\/li>\n<li>V\u1edbi m\u1ed9t \u00f4, ch\u00fang ta c\u00f3 th\u1ec3 l\u1ea5y bi\u1ec3u th\u1ee9c v\u00e0 gi\u00e1 tr\u1ecb li\u00ean quan, nh\u01b0ng\n<ul>\n<li>v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb (ho\u1eb7c bi\u1ec3u th\u1ee9c) ch\u00fang ta kh\u00f4ng th\u1ec3 t\u00ecm th\u1ea5y \u00f4 m\u00e0 nh\u1eefng th\u1ee9 \u0111\u00f3 l\u00e0 thu\u1ed9c t\u00ednh.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/section>\n<section data-magellan-target=\"class-member-visibility\" id=\"class-member-visibility\">\n<h2>T\u00ednh kh\u1ea3 thi c\u1ee7a thu\u1ed9c t\u00ednh v\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a l\u1edbp<\/h2>\n<p>Trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, c\u00f3 m\u1ed9t k\u00fd hi\u1ec7u v\u1ec1 t\u00ednh kh\u1ea3 thi cho c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ho\u1ea1t \u0111\u1ed9ng. UML x\u00e1c \u0111\u1ecbnh b\u1ed1n lo\u1ea1i t\u00ednh kh\u1ea3 thi:\u00a0<strong>c\u00f4ng khai<\/strong>,\u00a0<strong>b\u1ea3o v\u1ec7<\/strong>,\u00a0<strong>ri\u00eang t\u01b0<\/strong>, v\u00e0\u00a0<strong>g\u00f3i<\/strong>.<\/p>\n<p>C\u00e1c k\u00fd hi\u1ec7u +, -, # v\u00e0 ~ tr\u01b0\u1edbc t\u00ean thu\u1ed9c t\u00ednh v\u00e0 ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t l\u1edbp bi\u1ec3u th\u1ecb t\u00ednh kh\u1ea3 thi c\u1ee7a thu\u1ed9c t\u00ednh v\u00e0 ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<ul>\n<li>+ bi\u1ec3u th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng c\u00f4ng khai<\/li>\n<li>\u2013 bi\u1ec3u th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng ri\u00eang t\u01b0<\/li>\n<li># bi\u1ec3u th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng b\u1ea3o v\u1ec7<\/li>\n<li>~ bi\u1ec3u th\u1ecb c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng g\u00f3i<\/li>\n<\/ul>\n<\/section>\n<section data-magellan-target=\"class-visibility-example\" id=\"class-visibility-example\">\n<h3>V\u00ed d\u1ee5 v\u1ec1 T\u00ednh kh\u1ea3 thi c\u1ee7a l\u1edbp<\/h3>\n<p id=\"tVohGJu\"><img alt=\"\" class=\"alignnone size-full wp-image-8976\" decoding=\"async\" height=\"141\" loading=\"lazy\" sizes=\"auto, (max-width: 357px) 100vw, 357px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216ddbf82876.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216ddbf82876.png 357w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216ddbf82876-300x118.png 300w\" width=\"357\"\/><\/p>\n<p>Trong v\u00ed d\u1ee5 tr\u00ean:<\/p>\n<ul>\n<li>thu\u1ed9c t\u00ednh1 v\u00e0 op1 c\u1ee7a MyClassName l\u00e0 c\u00f4ng khai<\/li>\n<li>thu\u1ed9c t\u00ednh3 v\u00e0 op3 l\u00e0 b\u1ea3o v\u1ec7.<\/li>\n<li>thu\u1ed9c t\u00ednh2 v\u00e0 op2 l\u00e0 ri\u00eang t\u01b0.<\/li>\n<\/ul>\n<p>Quy\u1ec1n truy c\u1eadp cho m\u1ed7i lo\u1ea1i t\u00ednh kh\u1ea3 thi n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb d\u01b0\u1edbi \u0111\u00e2y cho c\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00e1c l\u1edbp kh\u00e1c nhau.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Quy\u1ec1n truy c\u1eadp<\/th>\n<th>c\u00f4ng khai (+)<\/th>\n<th>ri\u00eang t\u01b0 (-)<\/th>\n<th>b\u1ea3o v\u1ec7 (#)<\/th>\n<th>G\u00f3i (~)<\/th>\n<\/tr>\n<tr>\n<td>C\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00f9ng m\u1ed9t l\u1edbp<\/td>\n<td>c\u00f3<\/td>\n<td>c\u00f3<\/td>\n<td>c\u00f3<\/td>\n<td>c\u00f3<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1c th\u00e0nh vi\u00ean c\u1ee7a c\u00e1c l\u1edbp k\u1ebf th\u1eeba<\/td>\n<td>c\u00f3<\/td>\n<td>kh\u00f4ng<\/td>\n<td>c\u00f3<\/td>\n<td>c\u00f3<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1c th\u00e0nh vi\u00ean c\u1ee7a b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o kh\u00e1c<\/td>\n<td>c\u00f3<\/td>\n<td>kh\u00f4ng<\/td>\n<td>kh\u00f4ng<\/td>\n<td>trong c\u00f9ng m\u1ed9t g\u00f3i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section data-magellan-target=\"multiplicity\" id=\"multiplicity\">\n<h2>\u0110\u1ed9 \u0111a d\u1ea1ng<\/h2>\n<p>C\u00f3 bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed7i l\u1edbp tham gia v\u00e0o c\u00e1c m\u1ed1i quan h\u1ec7 v\u00e0 \u0111\u1ed9 \u0111a d\u1ea1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb nh\u01b0 sau:<\/p>\n<ul>\n<li>Ch\u00ednh x\u00e1c m\u1ed9t \u2013 1<\/li>\n<li>Kh\u00f4ng ho\u1eb7c m\u1ed9t \u2013 0..1<\/li>\n<li>Nhi\u1ec1u \u2013 0..* ho\u1eb7c *<\/li>\n<li>M\u1ed9t ho\u1eb7c nhi\u1ec1u \u2013 1..*<\/li>\n<li>S\u1ed1 ch\u00ednh x\u00e1c \u2013 v\u00ed d\u1ee5: 3..4 ho\u1eb7c 6<\/li>\n<li>Ho\u1eb7c m\u1ed9t m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p \u2013 v\u00ed d\u1ee5: 0..1, 3..4, 6.* s\u1ebd c\u00f3 ngh\u0129a l\u00e0 b\u1ea5t k\u1ef3 s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o kh\u00e1c ngo\u00e0i 2 ho\u1eb7c 5<\/li>\n<\/ul>\n<\/section>\n<section data-magellan-target=\"multiplicity-example\" id=\"multiplicity-example\">\n<h3>V\u00ed d\u1ee5 v\u1ec1 \u0110\u1ed9 \u0111a d\u1ea1ng<\/h3>\n<div class=\"space-gap-small\"><\/div>\n<ul>\n<li>Y\u00eau c\u1ea7u: M\u1ed9t Sinh vi\u00ean c\u00f3 th\u1ec3 tham gia nhi\u1ec1u Kh\u00f3a h\u1ecdc v\u00e0 nhi\u1ec1u Sinh vi\u00ean c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ghi danh v\u00e0o m\u1ed9t Kh\u00f3a h\u1ecdc.<\/li>\n<li>Trong v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y,\u00a0<strong>s\u01a1 \u0111\u1ed3 l\u1edbp<\/strong>\u00a0(b\u00ean tr\u00e1i), m\u00f4 t\u1ea3 tuy\u00ean b\u1ed1 c\u1ee7a y\u00eau c\u1ea7u tr\u00ean cho m\u00f4 h\u00ecnh t\u0129nh trong khi s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng (b\u00ean ph\u1ea3i) cho th\u1ea5y \u1ea3nh ch\u1ee5p nhanh (m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp) v\u1ec1 vi\u1ec7c ghi danh kh\u00f3a h\u1ecdc cho c\u00e1c kh\u00f3a h\u1ecdc K\u1ef9 thu\u1eadt Ph\u1ea7n m\u1ec1m v\u00e0 Qu\u1ea3n l\u00fd C\u01a1 s\u1edf D\u1eef li\u1ec7u t\u01b0\u01a1ng \u1ee9ng)<\/li>\n<\/ul>\n<p><img alt=\"Object Diagram\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/09-class-diagram-to-object-diagram.png\"\/><\/p>\n<p id=\"TzlfKPZ\"><img alt=\"\" class=\"alignnone size-full wp-image-8951\" decoding=\"async\" height=\"135\" loading=\"lazy\" sizes=\"auto, (max-width: 837px) 100vw, 837px\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216da89a5981.png\" srcset=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216da89a5981.png 837w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216da89a5981-300x48.png 300w, https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/img_6216da89a5981-768x124.png 768w\" width=\"837\"\/><\/p>\n<\/section>\n<section data-magellan-target=\"aggregation-example\" id=\"aggregation-example\">\n<h2>V\u00ed d\u1ee5 v\u1ec1 T\u1eadp h\u1ee3p \u2013 M\u00e1y t\u00ednh v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn<\/h2>\n<div class=\"space-gap-small\"><\/div>\n<ul>\n<li>M\u1ed9t t\u1eadp h\u1ee3p l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a li\u00ean k\u1ebft bi\u1ec3u th\u1ecb m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p \u201cbao g\u1ed3m\u201d<\/li>\n<li>T\u1eadp h\u1ee3p l\u00e0 l\u1edbp cha, c\u00e1c th\u00e0nh ph\u1ea7n l\u00e0 c\u00e1c l\u1edbp con<\/li>\n<\/ul>\n<div class=\"space-gap-small\"><img alt=\"Aggregation Example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/10-aggregation-example.png\"\/><\/div>\n<\/section>\n<section data-magellan-target=\"inheritance-example\" id=\"inheritance-example\">\n<h2>V\u00ed d\u1ee5 v\u1ec1 K\u1ebf th\u1eeba \u2013 Ph\u00e2n lo\u1ea1i \u00d4<\/h2>\n<div class=\"space-gap-small\"><\/div>\n<ul>\n<li>K\u1ebf th\u1eeba l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t kh\u00e1c c\u1ee7a m\u1ed9t li\u00ean k\u1ebft bi\u1ec3u th\u1ecb m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p \u201clo\u1ea1i\u201d<\/li>\n<li>K\u1ebf th\u1eeba \u0111\u01a1n gi\u1ea3n h\u00f3a m\u00f4 h\u00ecnh ph\u00e2n t\u00edch b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u m\u1ed9t ph\u00e2n lo\u1ea1i<\/li>\n<li>C\u00e1c l\u1edbp con k\u1ebf th\u1eeba c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a l\u1edbp cha.<\/li>\n<\/ul>\n<div class=\"space-gap-small\"><img alt=\"Inheritance Example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/11-inheritance-example.png\"\/><\/div>\n<p>\u00a0<\/p>\n<\/section>\n<section data-magellan-target=\"class-diagram-diagram-tool-example\" id=\"class-diagram-diagram-tool-example\">\n<h2>S\u01a1 \u0111\u1ed3 l\u1edbp \u2013 V\u00ed d\u1ee5 v\u1ec1 C\u00f4ng c\u1ee5 S\u01a1 \u0111\u1ed3<\/h2>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp c\u0169ng c\u00f3 th\u1ec3 c\u00f3 c\u00e1c ghi ch\u00fa \u0111\u00ednh k\u00e8m cho c\u00e1c l\u1edbp ho\u1eb7c m\u1ed1i quan h\u1ec7. C\u00e1c ghi ch\u00fa \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1eb1ng m\u00e0u x\u00e1m.<\/p>\n<div class=\"space-gap-small\"><img alt=\"Class Diagram Example\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/12-uml-class-diagram-example.png\"\/><\/div>\n<p>\u00a0<\/p>\n<div class=\"space-gap-small\"><\/div>\n<p>Trong v\u00ed d\u1ee5 tr\u00ean:<\/p>\n<p>Ch\u00fang ta c\u00f3 th\u1ec3 di\u1ec5n gi\u1ea3i \u00fd ngh\u0129a c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp tr\u00ean b\u1eb1ng c\u00e1ch \u0111\u1ecdc qua c\u00e1c \u0111i\u1ec3m nh\u01b0 sau.<\/p>\n<ol>\n<li>H\u00ecnh d\u1ea1ng l\u00e0 m\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng. N\u00f3 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1eb1ng ch\u1eef nghi\u00eang.<\/li>\n<li>H\u00ecnh d\u1ea1ng l\u00e0 m\u1ed9t l\u1edbp si\u00eau. H\u00ecnh tr\u00f2n, H\u00ecnh ch\u1eef nh\u1eadt v\u00e0 \u0110a gi\u00e1c \u0111\u01b0\u1ee3c k\u1ebf th\u1eeba t\u1eeb H\u00ecnh d\u1ea1ng. N\u00f3i c\u00e1ch kh\u00e1c, m\u1ed9t H\u00ecnh tr\u00f2n l\u00e0 m\u1ed9t H\u00ecnh d\u1ea1ng. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1ed5ng qu\u00e1t \/ k\u1ebf th\u1eeba.<\/li>\n<li>C\u00f3 m\u1ed9t li\u00ean k\u1ebft gi\u1eefa H\u1ed9p tho\u1ea1i v\u00e0 B\u1ed9 \u0111i\u1ec1u khi\u1ec3n d\u1eef li\u1ec7u.<\/li>\n<li>H\u00ecnh d\u1ea1ng l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a C\u1eeda s\u1ed5. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1eadp h\u1ee3p. H\u00ecnh d\u1ea1ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n C\u1eeda s\u1ed5.<\/li>\n<li>\u0110i\u1ec3m l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a H\u00ecnh tr\u00f2n. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 th\u00e0nh ph\u1ea7n. \u0110i\u1ec3m kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 H\u00ecnh tr\u00f2n.<\/li>\n<li>C\u1eeda s\u1ed5 ph\u1ee5 thu\u1ed9c v\u00e0o S\u1ef1 ki\u1ec7n. Tuy nhi\u00ean, S\u1ef1 ki\u1ec7n kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o C\u1eeda s\u1ed5.<\/li>\n<li>C\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a H\u00ecnh tr\u00f2n l\u00e0 b\u00e1n k\u00ednh v\u00e0 t\u00e2m. \u0110\u00e2y l\u00e0 m\u1ed9t l\u1edbp th\u1ef1c th\u1ec3.<\/li>\n<li>C\u00e1c t\u00ean ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a H\u00ecnh tr\u00f2n l\u00e0 area(), circum(), setCenter() v\u00e0 setRadius().<\/li>\n<li>Tham s\u1ed1 b\u00e1n k\u00ednh trong H\u00ecnh tr\u00f2n l\u00e0 m\u1ed9t tham s\u1ed1 \u0111\u1ea7u v\u00e0o ki\u1ec3u float.<\/li>\n<li>Ph\u01b0\u01a1ng th\u1ee9c area() c\u1ee7a l\u1edbp H\u00ecnh tr\u00f2n tr\u1ea3 v\u1ec1 m\u1ed9t gi\u00e1 tr\u1ecb ki\u1ec3u double.<\/li>\n<li>C\u00e1c thu\u1ed9c t\u00ednh v\u00e0 t\u00ean ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a H\u00ecnh ch\u1eef nh\u1eadt b\u1ecb \u1ea9n. M\u1ed9t s\u1ed1 l\u1edbp kh\u00e1c trong s\u01a1 \u0111\u1ed3 c\u0169ng c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 t\u00ean ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a ch\u00fang b\u1ecb \u1ea9n.<\/li>\n<\/ol>\n<section data-magellan-target=\"uml-class-diagram-order-system\" id=\"uml-class-diagram-order-system\">\n<h2>V\u00ed d\u1ee5 v\u1ec1 S\u01a1 \u0111\u1ed3 l\u1edbp: H\u1ec7 th\u1ed1ng \u0110\u1eb7t h\u00e0ng<\/h2>\n<div class=\"space-gap-small\"><\/div>\n<p><img alt=\"Class Diagram Example: Order System\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/17-class-diagram-example-order-system.png\"\/><\/p>\n<div class=\"space-gap\"><\/div>\n<\/section>\n<section data-magellan-target=\"uml-class-diagram-gui\" id=\"uml-class-diagram-gui\">\n<h2>V\u00ed d\u1ee5 v\u1ec1 s\u01a1 \u0111\u1ed3 l\u1edbp: GUI<\/h2>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp c\u0169ng c\u00f3 th\u1ec3 c\u00f3 c\u00e1c ghi ch\u00fa \u0111\u00ednh k\u00e8m cho c\u00e1c l\u1edbp ho\u1eb7c m\u1ed1i quan h\u1ec7.<\/p>\n<p><img alt=\"Class Diagram Example: GUI\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/18-uml-class-diagram-example-gui.png\"\/><\/p>\n<\/section>\n<\/section>\n<section data-magellan-target=\"multi-or-single-class-diagram\" id=\"multi-or-single-class-diagram\">\n<h2>X\u1eed l\u00fd h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p \u2013 S\u01a1 \u0111\u1ed3 l\u1edbp nhi\u1ec1u hay \u0111\u01a1n?<\/h2>\n<p>Ch\u1eafc ch\u1eafn r\u1eb1ng, n\u1ebfu b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng l\u1edbn ho\u1eb7c m\u1ed9t l\u0129nh v\u1ef1c kinh doanh l\u1edbn, s\u1ebd c\u00f3 nhi\u1ec1u th\u1ef1c th\u1ec3 m\u00e0 b\u1ea1n ph\u1ea3i xem x\u00e9t. Ch\u00fang ta n\u00ean s\u1eed d\u1ee5ng nhi\u1ec1u s\u01a1 \u0111\u1ed3 l\u1edbp hay m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp duy nh\u1ea5t \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a v\u1ea5n \u0111\u1ec1? C\u00e2u tr\u1ea3 l\u1eddi l\u00e0:<\/p>\n<ul>\n<li>Thay v\u00ec m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi th\u1ef1c th\u1ec3 v\u00e0 m\u1ed1i quan h\u1ec7 c\u1ee7a n\u00f3 tr\u00ean m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp duy nh\u1ea5t, t\u1ed1t h\u01a1n l\u00e0 s\u1eed d\u1ee5ng nhi\u1ec1u s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n<li>Chia m\u1ed9t h\u1ec7 th\u1ed1ng th\u00e0nh nhi\u1ec1u s\u01a1 \u0111\u1ed3 l\u1edbp gi\u00fap h\u1ec7 th\u1ed1ng d\u1ec5 hi\u1ec3u h\u01a1n, \u0111\u1eb7c bi\u1ec7t n\u1ebfu m\u1ed7i s\u01a1 \u0111\u1ed3 l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda c\u1ee7a m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<\/section>\n<section data-magellan-target=\"class-diagram-in-sdlc\" id=\"class-diagram-in-sdlc\">\n<h2>C\u00e1c g\u00f3c nh\u00ecn c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m<\/h2>\n<p>Ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp trong c\u00e1c giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n kh\u00e1c nhau c\u1ee7a m\u1ed9t<a href=\"https:\/\/en.wikipedia.org\/wiki\/Systems_development_life_cycle\" rel=\"noopener\" target=\"_blank\">v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m<\/a>v\u00e0 th\u01b0\u1eddng b\u1eb1ng c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a s\u01a1 \u0111\u1ed3 l\u1edbp trong ba g\u00f3c nh\u00ecn kh\u00e1c nhau (c\u00e1c m\u1ee9c \u0111\u1ed9 chi ti\u1ebft) d\u1ea7n d\u1ea7n khi ch\u00fang ta ti\u1ebfn l\u00ean:<\/p>\n<p><strong>G\u00f3c nh\u00ecn kh\u00e1i ni\u1ec7m<\/strong>: C\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i nh\u01b0 m\u00f4 t\u1ea3 c\u00e1c s\u1ef1 v\u1eadt trong th\u1ebf gi\u1edbi th\u1ef1c. Do \u0111\u00f3, n\u1ebfu b\u1ea1n l\u1ea5y g\u00f3c nh\u00ecn kh\u00e1i ni\u1ec7m, b\u1ea1n s\u1ebd v\u1ebd m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c kh\u00e1i ni\u1ec7m trong l\u0129nh v\u1ef1c \u0111ang nghi\u00ean c\u1ee9u. Nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y s\u1ebd t\u1ef1 nhi\u00ean li\u00ean quan \u0111\u1ebfn c\u00e1c l\u1edbp th\u1ef1c hi\u1ec7n ch\u00fang. G\u00f3c nh\u00ecn kh\u00e1i ni\u1ec7m l\u00e0<strong>\u0111\u01b0\u1ee3c coi l\u00e0 \u0111\u1ed9c l\u1eadp v\u1edbi ng\u00f4n ng\u1eef<\/strong>.<\/p>\n<p><strong>G\u00f3c nh\u00ecn \u0111\u1eb7c t\u1ea3<\/strong>: C\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i nh\u01b0 m\u00f4 t\u1ea3 c\u00e1c tr\u1eebu t\u01b0\u1ee3ng ho\u1eb7c th\u00e0nh ph\u1ea7n ph\u1ea7n m\u1ec1m v\u1edbi c\u00e1c \u0111\u1eb7c t\u1ea3 v\u00e0 giao di\u1ec7n nh\u01b0ng kh\u00f4ng cam k\u1ebft v\u1edbi m\u1ed9t tri\u1ec3n khai c\u1ee5 th\u1ec3. Do \u0111\u00f3, n\u1ebfu b\u1ea1n l\u1ea5y g\u00f3c nh\u00ecn \u0111\u1eb7c t\u1ea3, ch\u00fang ta \u0111ang<strong>nh\u00ecn v\u00e0o c\u00e1c giao di\u1ec7n c\u1ee7a ph\u1ea7n m\u1ec1m<\/strong>, kh\u00f4ng ph\u1ea3i l\u00e0 tri\u1ec3n khai.<\/p>\n<p><strong>G\u00f3c nh\u00ecn tri\u1ec3n khai<\/strong>: C\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c di\u1ec5n gi\u1ea3i nh\u01b0 m\u00f4 t\u1ea3 c\u00e1c tri\u1ec3n khai ph\u1ea7n m\u1ec1m trong m\u1ed9t c\u00f4ng ngh\u1ec7 c\u1ee5 th\u1ec3 v\u00e0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Programming_language\" rel=\"noopener\" target=\"_blank\">ng\u00f4n ng\u1eef<\/a>. Do \u0111\u00f3, n\u1ebfu b\u1ea1n l\u1ea5y g\u00f3c nh\u00ecn tri\u1ec3n khai, ch\u00fang ta \u0111ang<strong>nh\u00ecn v\u00e0o vi\u1ec7c tri\u1ec3n khai ph\u1ea7n m\u1ec1m<\/strong>.<\/p>\n<\/section>\n<h3>B\u1ea1n \u0111ang t\u00ecm ki\u1ebfm m\u1ed9t c\u00f4ng c\u1ee5 v\u1ebd s\u01a1 \u0111\u1ed3 l\u1edbp mi\u1ec5n ph\u00ed?<\/h3>\n<p>Visual Paradigm Online (VP Online) Phi\u00ean b\u1ea3n mi\u1ec5n ph\u00ed l\u00e0 m\u1ed9t ph\u1ea7n m\u1ec1m v\u1ebd tr\u1ef1c tuy\u1ebfn mi\u1ec5n ph\u00ed h\u1ed7 tr\u1ee3 s\u01a1 \u0111\u1ed3 l\u1edbp, c\u00e1c s\u01a1 \u0111\u1ed3 UML kh\u00e1c, c\u00f4ng c\u1ee5 ERD v\u00e0 c\u00f4ng c\u1ee5 bi\u1ec3u \u0111\u1ed3 t\u1ed5 ch\u1ee9c. N\u00f3 c\u00f3 m\u1ed9t tr\u00ecnh ch\u1ec9nh s\u1eeda \u0111\u01a1n gi\u1ea3n nh\u01b0ng m\u1ea1nh m\u1ebd cho ph\u00e9p b\u1ea1n t\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp nhanh ch\u00f3ng v\u00e0 d\u1ec5 d\u00e0ng. Tr\u00ecnh ch\u1ec9nh s\u1eeda UML mi\u1ec5n ph\u00ed n\u00e0y kh\u00f4ng c\u00f3 qu\u1ea3ng c\u00e1o, kh\u00f4ng c\u00f3 th\u1eddi h\u1ea1n truy c\u1eadp v\u00e0 kh\u00f4ng c\u00f3 h\u1ea1n ch\u1ebf, v\u00ed d\u1ee5, v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3, s\u1ed1 l\u01b0\u1ee3ng h\u00ecnh d\u1ea1ng, v.v. B\u1ea1n s\u1edf h\u1eefu c\u00e1c s\u01a1 \u0111\u1ed3 b\u1ea1n t\u1ea1o ra cho m\u1ee5c \u0111\u00edch c\u00e1 nh\u00e2n v\u00e0 phi th\u01b0\u01a1ng m\u1ea1i.<\/p>\n<p><img alt=\"Online Class Diagram Tool\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/02-class-diagram-example-car.png\"\/><\/p>\n<p id=\"FqIrpYB\">B\u1ea1n \u0111ang t\u00ecm ki\u1ebfm m\u00f4 h\u00ecnh h\u00f3a UML ch\u00ednh th\u1ee9c h\u01a1n tr\u00ean m\u00e1y t\u00ednh \u0111\u1ec3 b\u00e0n?<\/p>\n<p>Visual Paradigm Phi\u00ean b\u1ea3n C\u1ed9ng \u0111\u1ed3ng \u0111\u00e3 \u0111\u01b0\u1ee3c ra m\u1eaft t\u1eeb n\u0103m 2004 \u0111\u1ec3 cung c\u1ea5p m\u1ed9t<strong>ph\u1ea7n m\u1ec1m UML mi\u1ec5n ph\u00ed<\/strong>cho m\u1ee5c \u0111\u00edch phi th\u01b0\u01a1ng m\u1ea1i duy nh\u1ea5t, h\u1ed7 tr\u1ee3 ng\u01b0\u1eddi d\u00f9ng \u0111ang th\u1ef1c hi\u1ec7n nh\u1eefng b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong m\u00f4 h\u00ecnh h\u00f3a UML, v\u00e0 nh\u1eefng ng\u01b0\u1eddi c\u1ea7n m\u1ed9t ph\u1ea7n m\u1ec1m m\u00f4 h\u00ecnh h\u00f3a UML mi\u1ec5n ph\u00ed v\u00e0 \u0111a n\u1ec1n t\u1ea3ng cho m\u1ee5c \u0111\u00edch c\u00e1 nh\u00e2n, ch\u1eb3ng h\u1ea1n nh\u01b0 \u00e1p d\u1ee5ng UML v\u00e0o c\u00e1c d\u1ef1 \u00e1n sinh vi\u00ean.<\/p>\n<p><img alt=\"Visual Paradigm screen\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/why-vp.png\"\/><\/p>\n<div class=\"cl-preview-section\">\n<h4 id=\"uml-modelling-tool-free-for-all-sorts-of-non-commercial-purpose.-supporting-the-13-uml-2.x-diagrams\">C\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a UML mi\u1ec5n ph\u00ed cho t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i m\u1ee5c \u0111\u00edch phi th\u01b0\u01a1ng m\u1ea1i. H\u1ed7 tr\u1ee3 13 s\u01a1 \u0111\u1ed3 UML 2.x<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Free UML Tool with 13 UML 2.x Diagrams Supported\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/global.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>Ch\u00fang t\u00f4i \u0111\u00e3 \u0111\u01b0\u1ee3c h\u01a1n 1 tri\u1ec7u c\u00e0i \u0111\u1eb7t tr\u00ean to\u00e0n c\u1ea7u ch\u1ea5p nh\u1eadn v\u00e0 v\u1eabn \u0111ang ph\u00e1t tri\u1ec3n. Nhi\u1ec1u ng\u01b0\u1eddi \u0111ang s\u1eed d\u1ee5ng c\u00e1c phi\u00ean b\u1ea3n tr\u1ea3 ph\u00ed c\u1ee7a Visual Paradigm \u0111\u1ec3 v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 UML v\u00e0 ERD chuy\u00ean nghi\u1ec7p cho thi\u1ebft k\u1ebf v\u00e0 ph\u00e2n t\u00edch h\u1ec7 th\u1ed1ng v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u00e0ng ng\u00e0y.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-2\">L\u00fd do 2<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"trust-by-it-professionals-and-large-organizations\">\u0110\u01b0\u1ee3c tin t\u01b0\u1edfng b\u1edfi c\u00e1c chuy\u00ean gia CNTT v\u00e0 c\u00e1c t\u1ed5 ch\u1ee9c l\u1edbn<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>Nhi\u1ec1u t\u1ed5 ch\u1ee9c h\u00e0ng \u0111\u1ea7u, c\u00f4ng ty CNTT, t\u01b0 v\u1ea5n, tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc, NGO v\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb ch\u00ednh ph\u1ee7 tr\u00ean to\u00e0n th\u1ebf gi\u1edbi \u0111\u00e3 ch\u1ea5p nh\u1eadn Visual Paradigm (c\u00e1c phi\u00ean b\u1ea3n tr\u1ea3 ph\u00ed). H\u00ecnh d\u01b0\u1edbi \u0111\u00e2y cho th\u1ea5y m\u1ed9t s\u1ed1 kh\u00e1ch h\u00e0ng tr\u1ea3 ph\u00ed c\u1ee7a ch\u00fang t\u00f4i.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Visual Paradigm Customers\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/customers.gif\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-3\">L\u00fd do 3<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"high-quality---award-winning\">Ch\u1ea5t l\u01b0\u1ee3ng cao \u2013 \u0110o\u1ea1t gi\u1ea3i th\u01b0\u1edfng<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>Ch\u00fang t\u00f4i kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c tin t\u01b0\u1edfng b\u1edfi c\u00e1c doanh nghi\u1ec7p n\u1ed5i ti\u1ebfng nh\u1ea5t tr\u00ean to\u00e0n c\u1ea7u, m\u00e0 c\u00f2n b\u1edfi ng\u00e0nh c\u00f4ng nghi\u1ec7p. Visual Paradigm l\u00e0 m\u1ed9t ng\u01b0\u1eddi chi\u1ebfn th\u1eafng nhi\u1ec1u gi\u1ea3i th\u01b0\u1edfng qu\u1ed1c t\u1ebf.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Visual Paradigm Awards\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/awards.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-4\">L\u00fd do 4<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"the-most-widely-used-modeling-platform-for-academia\">N\u1ec1n t\u1ea3ng m\u00f4 h\u00ecnh h\u00f3a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t cho h\u1ecdc thu\u1eadt<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>C\u00f4ng c\u1ee5 UML \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t cho h\u1ecdc thu\u1eadt, \u0111\u01b0\u1ee3c h\u00e0ng ng\u00e0n tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc v\u00e0 cao \u0111\u1eb3ng ch\u1ea5p nh\u1eadn.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Schools Using Visual Paradigm\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/school-logo.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-5\">L\u00fd do 5<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"huge-collection-of-free-learning-resources-support-by-vp-community-circle\">B\u1ed9 s\u01b0u t\u1eadp kh\u1ed5ng l\u1ed3 c\u00e1c t\u00e0i nguy\u00ean h\u1ecdc t\u1eadp MI\u1ec4N PH\u00cd (h\u1ed7 tr\u1ee3 b\u1edfi VP Community Circle)<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Hundreds of UML and ERD diagram examples and templates\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/hundreds-diagram.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><a href=\"https:\/\/circle.visual-paradigm.com\/\">H\u00e0ng tr\u0103m v\u00ed d\u1ee5 v\u1ec1 UML v\u00e0 ERD<\/a>s\u1eb5n s\u00e0ng \u0111\u1ec3 nh\u1eadp v\u00e0o Visual Paradigm cho c\u00e1c th\u1eed nghi\u1ec7m ngay l\u1eadp t\u1ee9c ho\u1eb7c \u0111\u1ec3 b\u1eaft \u0111\u1ea7u v\u1edbi m\u00f4 h\u00ecnh UML c\u1ee7a ri\u00eang b\u1ea1n. T\u1ea5t c\u1ea3 \u0111\u1ec1u MI\u1ec4N PH\u00cd.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-6\">L\u00fd do 6<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"upgrade-path-to-the-commercial-editions-for-wide-spectrum-of-applications-and-possibilities\">L\u1ed9 tr\u00ecnh n\u00e2ng c\u1ea5p l\u00ean c\u00e1c phi\u00ean b\u1ea3n th\u01b0\u01a1ng m\u1ea1i cho nhi\u1ec1u \u1ee9ng d\u1ee5ng v\u00e0 kh\u1ea3 n\u0103ng<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>N\u00e2ng c\u1ea5p d\u1ec5 d\u00e0ng cho m\u1ed9t b\u1ed9 t\u00ednh n\u0103ng b\u1ed5 sung kh\u1ed5ng l\u1ed3 (ch\u1eb3ng h\u1ea1n, h\u1ed7 tr\u1ee3 BPMN v\u00e0 h\u1ee3p t\u00e1c nh\u00f3m) v\u00e0 cho m\u1ee5c \u0111\u00edch th\u01b0\u01a1ng m\u1ea1i, b\u1eaft \u0111\u1ea7u t\u1eeb<a href=\"https:\/\/www.visual-paradigm.com\/shop\/vp.jsp\">$6 \/ th\u00e1ng<\/a>.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Packed features in Visual Paradigm\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/package.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-7\">L\u00fd do 7<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"active-user-forum-to-get-helps-and-exchange-ideas--experiences\">Di\u1ec5n \u0111\u00e0n ng\u01b0\u1eddi d\u00f9ng t\u00edch c\u1ef1c \u0111\u1ec3 nh\u1eadn tr\u1ee3 gi\u00fap v\u00e0 trao \u0111\u1ed5i \u00fd t\u01b0\u1edfng &amp; Kinh nghi\u1ec7m<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>H\u1ed7 tr\u1ee3, chia s\u1ebb v\u00e0 trao \u0111\u1ed5i \u00fd t\u01b0\u1edfng c\u1ee7a b\u1ea1n v\u1edbi nh\u1eefng ng\u01b0\u1eddi kh\u00e1c trong<a href=\"http:\/\/forums.visual-paradigm.com\/\">di\u1ec5n \u0111\u00e0n ng\u01b0\u1eddi d\u00f9ng t\u00edch c\u1ef1c c\u1ee7a Visual Paradigm<\/a>.<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Visual Paradigm forum\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/sharing.png\"\/><\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<h3 id=\"reason-8\">L\u00fd do 8<\/h3>\n<\/div>\n<div class=\"cl-preview-section\">\n<h4 id=\"cross-platform-user-friendly-fast--responsive-application\">\u1ee8ng d\u1ee5ng \u0111a n\u1ec1n t\u1ea3ng, th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng, nhanh ch\u00f3ng &amp; ph\u1ea3n h\u1ed3i t\u1ed1t<\/h4>\n<\/div>\n<div class=\"cl-preview-section\">\n<p>Visual Paradigm c\u00f3 th\u1ec3 ch\u1ea1y tr\u00ean c\u00e1c n\u1ec1n t\u1ea3ng kh\u00e1c nhau nh\u01b0 Windows, Linux v\u00e0 Mac. Giao di\u1ec7n tr\u1ef1c quan v\u00e0 c\u00e1c t\u00ednh n\u0103ng m\u00f4 h\u00ecnh h\u00f3a m\u1ea1nh m\u1ebd c\u1ee7a n\u00f3 gi\u00fap vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a nhanh ch\u00f3ng v\u00e0 d\u1ec5 d\u00e0ng!<\/p>\n<\/div>\n<div class=\"cl-preview-section\">\n<p><img alt=\"Cross Platform UML software\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/vn\/wp-content\/uploads\/sites\/14\/2022\/02\/multios.png\"\/><\/p>\n<h3>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/\">UML l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/why-uml-modeling\/\">T\u1ea1i sao m\u00f4 h\u00ecnh h\u00f3a UML?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\">T\u1ed5ng quan v\u1ec1 14 lo\u1ea1i s\u01a1 \u0111\u1ed3 UML<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-class-diagram\/\">S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-component-diagram\/\">S\u01a1 \u0111\u1ed3 th\u00e0nh ph\u1ea7n l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-deployment-diagram\/\">S\u01a1 \u0111\u1ed3 tri\u1ec3n khai l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-object-diagram\/\">S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-package-diagram\/\">S\u01a1 \u0111\u1ed3 g\u00f3i l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-composite-structure-diagram\/\">S\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u1ed5ng h\u1ee3p l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-profile-diagram\/\">S\u01a1 \u0111\u1ed3 h\u1ed3 s\u01a1 l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-use-case-diagram\/\">S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-activity-diagram\/\">S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-state-machine-diagram\/\">S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-communication-diagram\/\">S\u01a1 \u0111\u1ed3 giao ti\u1ebfp l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-interaction-overview-diagram\/\">S\u01a1 \u0111\u1ed3 t\u1ed5ng quan t\u01b0\u01a1ng t\u00e1c l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-timing-diagram\/\">S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 g\u00ec?<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Class diagrams are useful in many phases of system design. During the analysis phase, class diagrams can help you understand the requirements of the problem domain and identify its components. 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