{"id":106,"date":"2026-04-07T19:28:24","date_gmt":"2026-04-07T19:28:24","guid":{"rendered":"https:\/\/www.hi-posts.com\/vn\/object-oriented-analysis-design-primer\/"},"modified":"2026-04-07T19:28:24","modified_gmt":"2026-04-07T19:28:24","slug":"object-oriented-analysis-design-primer","status":"publish","type":"post","link":"https:\/\/www.hi-posts.com\/vn\/object-oriented-analysis-design-primer\/","title":{"rendered":"Gi\u1edbi thi\u1ec7u Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng: Nh\u1eefng Kh\u00e1i ni\u1ec7m C\u1ed1t l\u00f5i M\u1ecdi L\u1eadp tr\u00ecnh vi\u00ean Nghi\u1ec7p d\u01b0 C\u1ea7n Bi\u1ebft"},"content":{"rendered":"<p>Trong b\u1ed1i c\u1ea3nh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t \u1ee9ng d\u1ee5ng d\u1ec5 v\u1ee1 v\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc th\u01b0\u1eddng n\u1eb1m \u1edf c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh tr\u01b0\u1edbc khi d\u00f2ng m\u00e3 \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c vi\u1ebft ra. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, hay OOAD. \u0110\u00e2y l\u00e0 giai \u0111o\u1ea1n l\u1eadp b\u1ea3n v\u1ebd ki\u1ebfn tr\u00fac, \u0111\u1ecbnh r\u00f5 c\u1ea5u tr\u00fac, h\u00e0nh vi v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec c\u1ee7a s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng. Hi\u1ec3u r\u00f5 nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 tu\u00e2n theo m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p; m\u00e0 l\u00e0 t\u01b0 duy theo c\u00e1ch t\u01b0\u01a1ng t\u00e1c, tr\u00e1ch nhi\u1ec7m v\u00e0 m\u1ed1i quan h\u1ec7.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u n\u1ec1n t\u1ea3ng. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u00e1c c\u01a1 ch\u1ebf c\u1ee7a OOAD, bi\u1ebfn nh\u1eefng \u00fd t\u01b0\u1edfng l\u00fd thuy\u1ebft ph\u1ee9c t\u1ea1p th\u00e0nh hi\u1ec3u bi\u1ebft th\u1ef1c ti\u1ec5n. \u0110\u1ebfn cu\u1ed1i b\u00e0i \u0111\u1ecdc n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch ti\u1ebfp c\u1eadn x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m theo nguy\u00ean t\u1eafc h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Hand-drawn marker illustration infographic explaining Object-Oriented Analysis and Design (OOAD) fundamentals: features the four pillars (encapsulation, abstraction, inheritance, polymorphism), analysis phase with use cases and domain objects, design phase with class relationships and cohesion\/coupling principles, SOLID acronym breakdown, common design patterns (Factory, Observer, Strategy), UML diagram types, and key pitfalls to avoid\u2014all presented in vibrant sketchy marker style with clear visual hierarchy for aspiring developers\" decoding=\"async\" src=\"https:\/\/www.hi-posts.com\/wp-content\/uploads\/2026\/04\/ooad-primer-core-concepts-infographic-marker-illustration.jpg\"\/><\/figure>\n<\/div>\n<h2>Hi\u1ec3u r\u00f5 M\u00f4 h\u00ecnh H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\udde0<\/h2>\n<p>Ph\u1ea7n m\u1ec1m \u0111\u00e3 ti\u1ebfn h\u00f3a t\u1eeb c\u00e1c \u0111o\u1ea1n m\u00e3 tuy\u1ebfn t\u00ednh th\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p. M\u00f4 h\u00ecnh H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OO) t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n xung quanh c\u00e1c &#8220;\u0111\u1ed1i t\u01b0\u1ee3ng&#8221; thay v\u00ec c\u00e1c h\u00e0nh \u0111\u1ed9ng v\u00e0 logic. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ef1c th\u1ec3 ri\u00eang bi\u1ec7t c\u00f3 tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi. S\u1ef1 thay \u0111\u1ed5i n\u00e0y chuy\u1ec3n h\u01b0\u1edbng ch\u00fa \u00fd c\u1ee7a nh\u00e0 ph\u00e1t tri\u1ec3n t\u1eeb &#8220;ch\u01b0\u01a1ng tr\u00ecnh l\u00e0m g\u00ec?&#8221; sang &#8220;nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o t\u1ed3n t\u1ea1i trong l\u0129nh v\u1ef1c n\u00e0y, v\u00e0 ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o?&#8221;<\/p>\n<p>OOAD l\u00e0 c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 t\u01b0\u01a1ng t\u00e1c gi\u1eefa ch\u00fang. N\u00f3 g\u1ed3m hai giai \u0111o\u1ea1n ch\u00ednh:<\/p>\n<ul>\n<li><strong>Ph\u00e2n t\u00edch:<\/strong> T\u1eadp trung v\u00e0o vi\u1ec7c hi\u1ec3u l\u0129nh v\u1ef1c v\u1ea5n \u0111\u1ec1. \u0110\u1eb7t c\u00e2u h\u1ecfi: &#8220;H\u1ec7 th\u1ed1ng c\u1ea7n l\u00e0m g\u00ec?&#8221; m\u00e0 kh\u00f4ng c\u1ea7n lo l\u1eafng v\u1ec1 chi ti\u1ebft tri\u1ec3n khai.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf:<\/strong> T\u1eadp trung v\u00e0o gi\u1ea3i ph\u00e1p. \u0110\u1eb7t c\u00e2u h\u1ecfi: &#8220;H\u1ec7 th\u1ed1ng s\u1ebd \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng nh\u01b0 th\u1ebf n\u00e0o?&#8221; chuy\u1ec3n \u0111\u1ed5i y\u00eau c\u1ea7u th\u00e0nh m\u1ed9t c\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt.<\/li>\n<\/ul>\n<p>C\u00e1c giai \u0111o\u1ea1n n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng tuy\u1ebfn t\u00ednh. Ch\u00fang th\u01b0\u1eddng l\u1eb7p l\u1ea1i khi hi\u1ec3u bi\u1ebft \u0111\u01b0\u1ee3c s\u00e2u s\u1eafc h\u01a1n. B\u1ecf qua giai \u0111o\u1ea1n l\u1eadp k\u1ebf ho\u1ea1ch n\u00e0y th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn n\u1ee3 k\u1ef9 thu\u1eadt cao, khi m\u00e3 ngu\u1ed3n tr\u1edf n\u00ean kh\u00f3 s\u1eeda \u0111\u1ed5i theo th\u1eddi gian.<\/p>\n<h2>B\u1ed1n tr\u1ee5 c\u1ed9t c\u1ee7a L\u1eadp tr\u00ecnh H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83c\udfd7\ufe0f<\/h2>\n<p>Tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf, ng\u01b0\u1eddi ta ph\u1ea3i n\u1eafm v\u1eefng nh\u1eefng tr\u1ee5 c\u1ed9t n\u1ec1n t\u1ea3ng h\u1ed7 tr\u1ee3 m\u00f4 h\u00ecnh n\u00e0y. Nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y d\u1eabn d\u1eaft c\u00e1ch c\u1ea5u tr\u00fac \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 c\u00e1ch ch\u00fang li\u00ean h\u1ec7 v\u1edbi nhau. B\u1ecf qua nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn s\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd v\u00e0 m\u00e3 ngu\u1ed3n d\u1ec5 g\u00e3y.<\/p>\n<h3>1. Bao \u0111\u00f3ng \ud83d\udd12<\/h3>\n<p>Bao \u0111\u00f3ng l\u00e0 vi\u1ec7c gom d\u1eef li\u1ec7u c\u00f9ng v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c thao t\u00e1c tr\u00ean d\u1eef li\u1ec7u \u0111\u00f3. N\u00f3 h\u1ea1n ch\u1ebf truy c\u1eadp tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng, nh\u1eb1m ng\u0103n ch\u1eb7n s\u1ef1 can thi\u1ec7p kh\u00f4ng mong mu\u1ed1n v\u00e0 l\u1ea1m d\u1ee5ng d\u1eef li\u1ec7u.<\/p>\n<ul>\n<li><strong>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng:<\/strong> N\u00f3 t\u1ea1o ra m\u1ed9t ranh gi\u1edbi. C\u00e1c ph\u1ea7n kh\u00e1c c\u1ee7a h\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u00e1c v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng th\u00f4ng qua m\u1ed9t giao di\u1ec7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, ch\u1ee9 kh\u00f4ng ph\u1ea3i th\u00f4ng qua vi\u1ec7c thao t\u00e1c tr\u1ef1c ti\u1ebfp v\u00e0o c\u00e1c bi\u1ebfn n\u1ed9i b\u1ed9.<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong> N\u1ebfu tri\u1ec3n khai n\u1ed9i b\u1ed9 thay \u0111\u1ed5i, m\u00e3 b\u00ean ngo\u00e0i s\u1ebd kh\u00f4ng b\u1ecb h\u1ecfng, mi\u1ec5n l\u00e0 giao di\u1ec7n v\u1eabn gi\u1eef nguy\u00ean.<\/li>\n<\/ul>\n<h3>2. Tr\u1eebu t\u01b0\u1ee3ng \ud83c\udfad<\/h3>\n<p>Tr\u1eebu t\u01b0\u1ee3ng t\u1eadp trung v\u00e0o che gi\u1ea5u c\u00e1c chi ti\u1ebft tri\u1ec3n khai ph\u1ee9c t\u1ea1p v\u00e0 ch\u1ec9 hi\u1ec3n th\u1ecb c\u00e1c t\u00ednh n\u0103ng thi\u1ebft y\u1ebfu c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m c\u1ea5p cao m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft \u0111\u1ebfn c\u00e1c c\u01a1 ch\u1ebf c\u1ea5p th\u1ea5p.<\/p>\n<ul>\n<li><strong>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng:<\/strong> N\u00f3 gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t &#8220;PaymentProcessor&#8221; m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft c\u00e1ch API ng\u00e2n h\u00e0ng x\u1eed l\u00fd giao d\u1ecbch.<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong> N\u00f3 \u0111\u01a1n gi\u1ea3n h\u00f3a \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng, gi\u00fap d\u1ec5 d\u00e0ng qu\u1ea3n l\u00fd c\u00e1c c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n l\u1edbn h\u01a1n.<\/li>\n<\/ul>\n<h3>3. K\u1ebf th\u1eeba \ud83e\uddec<\/h3>\n<p>K\u1ebf th\u1eeba cho ph\u00e9p m\u1ed9t l\u1edbp m\u1edbi k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi t\u1eeb m\u1ed9t l\u1edbp hi\u1ec7n c\u00f3. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y vi\u1ec7c t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n v\u00e0 thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7 ph\u00e2n c\u1ea5p gi\u1eefa c\u00e1c l\u1edbp.<\/p>\n<ul>\n<li><strong>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng:<\/strong> N\u00f3 m\u00f4 ph\u1ecfng m\u1ed1i quan h\u1ec7 &#8220;l\u00e0-m\u1ed9t&#8221;. M\u1ed9t <code>Xe h\u01a1i<\/code> l\u00e0 m\u1ed9t <code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code>. M\u1ed9t <code>Xe t\u1ea3i<\/code> l\u00e0 m\u1ed9t <code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code>.<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong>Logic chung \u0111\u01b0\u1ee3c vi\u1ebft m\u1ed9t l\u1ea7n trong l\u1edbp cha v\u00e0 chia s\u1ebb gi\u1eefa c\u00e1c l\u1edbp con, gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p.<\/li>\n<\/ul>\n<h3>4. \u0110a h\u00ecnh \ud83c\udfa8<\/h3>\n<p>\u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thu\u1ed9c c\u00e1c lo\u1ea1i kh\u00e1c nhau \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t ki\u1ec3u si\u00eau chung. N\u00f3 cho ph\u00e9p s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t giao di\u1ec7n cho c\u00e1c d\u1ea1ng c\u01a1 s\u1edf kh\u00e1c nhau.<\/p>\n<ul>\n<li><strong>T\u1ea1i sao \u0111i\u1ec1u \u0111\u00f3 quan tr\u1ecdng:<\/strong> N\u00f3 cho ph\u00e9p t\u00ednh linh ho\u1ea1t. B\u1ea1n c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t danh s\u00e1ch g\u1ed3m <code>H\u00ecnh d\u1ea1ng<\/code> ch\u1ee9a <code>H\u00ecnh tr\u00f2n<\/code> v\u00e0 <code>H\u00ecnh vu\u00f4ng<\/code> v\u00e0 g\u1ecdi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c <code>v\u1ebd()<\/code> tr\u00ean t\u1ea5t c\u1ea3 ch\u00fang m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft lo\u1ea1i c\u1ee5 th\u1ec3 c\u1ee7a ch\u00fang.<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong> N\u00f3 h\u1ed7 tr\u1ee3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng kh\u00f4ng gi\u1edbi h\u1ea1n. C\u00e1c lo\u1ea1i m\u1edbi c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i m\u00e3 hi\u1ec7n c\u00f3 s\u1eed d\u1ee5ng giao di\u1ec7n chung.<\/li>\n<\/ul>\n<h2>Giai \u0111o\u1ea1n ph\u00e2n t\u00edch: X\u00e1c \u0111\u1ecbnh v\u1ea5n \u0111\u1ec1 \ud83d\udd0d<\/h2>\n<p>Giai \u0111o\u1ea1n ph\u00e2n t\u00edch l\u00e0 v\u1ec1 vi\u1ec7c hi\u1ec3u c\u00e1c y\u00eau c\u1ea7u. \u0110\u00e2y l\u00e0 n\u01a1i b\u1ea1n chuy\u1ec3n \u0111\u1ed5i nhu c\u1ea7u kinh doanh th\u00e0nh c\u00e1c \u0111\u1eb7c t\u1ea3 ch\u1ee9c n\u0103ng. Giai \u0111o\u1ea1n n\u00e0y r\u1ea5t quan tr\u1ecdng v\u00ec n\u1ebfu c\u00e1c y\u00eau c\u1ea7u c\u00f3 v\u1ea5n \u0111\u1ec1, thi\u1ebft k\u1ebf s\u1ebd b\u1ecb sai, b\u1ea5t k\u1ec3 m\u00e3 ngu\u1ed3n c\u00f3 tinh t\u1ebf \u0111\u1ebfn \u0111\u00e2u.<\/p>\n<h3>X\u00e1c \u0111\u1ecbnh c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng \ud83d\udccb<\/h3>\n<p>M\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng m\u00f4 t\u1ea3 m\u1ed9t t\u01b0\u01a1ng t\u00e1c c\u1ee5 th\u1ec3 gi\u1eefa ng\u01b0\u1eddi d\u00f9ng (ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n) v\u00e0 h\u1ec7 th\u1ed1ng nh\u1eb1m \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau. \u0110\u00f3 l\u00e0 m\u1ed9t b\u1ea3n k\u1ec3 v\u1ec1 h\u1ec7 th\u1ed1ng l\u00e0m g\u00ec, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u00e1ch th\u1ee9c th\u1ef1c hi\u1ec7n.<\/p>\n<ul>\n<li><strong>Ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n:<\/strong> \u0110\u00e2y l\u00e0 ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c c\u00e1c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i t\u01b0\u01a1ng t\u00e1c v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. Ch\u00fang c\u00f3 th\u1ec3 l\u00e0 con ng\u01b0\u1eddi (v\u00ed d\u1ee5: \u201cNg\u01b0\u1eddi d\u00f9ng qu\u1ea3n tr\u1ecb\u201d) ho\u1eb7c phi con ng\u01b0\u1eddi (v\u00ed d\u1ee5: \u201cAPI c\u1ed5ng thanh to\u00e1n\u201d).<\/li>\n<li><strong>C\u00e1c t\u00ecnh hu\u1ed1ng:<\/strong> M\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u t\u00ecnh hu\u1ed1ng, bao g\u1ed3m \u0111\u01b0\u1eddng \u0111i l\u00fd t\u01b0\u1edfng (m\u1ecdi th\u1ee9 di\u1ec5n ra su\u00f4n s\u1ebb) v\u00e0 c\u00e1c \u0111\u01b0\u1eddng \u0111i thay th\u1ebf (x\u1ea3y ra l\u1ed7i ho\u1eb7c ngo\u1ea1i l\u1ec7).<\/li>\n<\/ul>\n<p>Khi t\u00e0i li\u1ec7u h\u00f3a c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng, s\u1ef1 r\u00f5 r\u00e0ng l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. Tr\u00e1nh d\u00f9ng thu\u1eadt ng\u1eef k\u1ef9 thu\u1eadt. T\u1eadp trung v\u00e0o m\u1ee5c \u0111\u00edch c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h3>X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng mi\u1ec1n \ud83e\udde9<\/h3>\n<p>Trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch, b\u1ea1n qu\u00e9t mi\u1ec1n v\u1ea5n \u0111\u1ec1 \u0111\u1ec3 t\u00ecm c\u00e1c danh t\u1eeb. Nh\u1eefng danh t\u1eeb n\u00e0y th\u01b0\u1eddng tr\u1edf th\u00e0nh c\u00e1c l\u1edbp ho\u1eb7c \u0111\u1ed1i t\u01b0\u1ee3ng ti\u1ec1m n\u0103ng. V\u00ed d\u1ee5, trong m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, c\u00e1c danh t\u1eeb c\u00f3 th\u1ec3 bao g\u1ed3m<code>Kh\u00e1ch h\u00e0ng<\/code>, <code>\u0110\u01a1n h\u00e0ng<\/code>, <code>S\u1ea3n ph\u1ea9m<\/code>, v\u00e0 <code>H\u00f3a \u0111\u01a1n<\/code>.<\/p>\n<p>R\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng gi\u00e1 tr\u1ecb v\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c th\u1ec3:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i<\/th>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>V\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Th\u1ef1c th\u1ec3<\/strong><\/td>\n<td>C\u00f3 \u0111\u1ecbnh danh, t\u1ed3n t\u1ea1i theo th\u1eddi gian, v\u00f2ng \u0111\u1eddi \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c.<\/td>\n<td><code>\u0110\u01a1n h\u00e0ng<\/code> (c\u00f3 ID, t\u1ed3n t\u1ea1i xuy\u00ean su\u1ed1t c\u00e1c phi\u00ean)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed1i t\u01b0\u1ee3ng gi\u00e1 tr\u1ecb<\/strong><\/td>\n<td>Kh\u00f4ng c\u00f3 \u0111\u1ecbnh danh, b\u1ea5t bi\u1ebfn, \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a n\u00f3.<\/td>\n<td><code>\u0110\u1ecba ch\u1ec9<\/code>, <code>Ti\u1ec1n<\/code> (\u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi \u0111\u01b0\u1eddng\/t\u00ean ho\u1eb7c s\u1ed1 ti\u1ec1n\/lo\u1ea1i ti\u1ec1n)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Vi\u1ec7c ph\u00e2n lo\u1ea1i ch\u00ednh x\u00e1c c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng m\u00f4 h\u00ecnh h\u00f3a th\u1ef1c t\u1ebf m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. Vi\u1ec7c nh\u1ea7m l\u1eabn th\u1ef1c th\u1ec3 v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng gi\u00e1 tr\u1ecb c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n<h2>Giai \u0111o\u1ea1n Thi\u1ebft k\u1ebf: X\u00e2y d\u1ef1ng Gi\u1ea3i ph\u00e1p \ud83d\udee0\ufe0f<\/h2>\n<p>M\u1ed9t khi giai \u0111o\u1ea1n ph\u00e2n t\u00edch x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng ph\u1ea3i l\u00e0m g\u00ec, giai \u0111o\u1ea1n thi\u1ebft k\u1ebf s\u1ebd x\u00e1c \u0111\u1ecbnh c\u00e1ch x\u00e2y d\u1ef1ng n\u00f3. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c t\u1ea1o ra m\u1ed9t m\u00f4 h\u00ecnh c\u1ea5u tr\u00fac cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch.<\/p>\n<h3>S\u01a1 \u0111\u1ed3 L\u1edbp v\u00e0 C\u00e1c M\u1ed1i quan h\u1ec7 \ud83d\udcca<\/h3>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 c\u00f4ng c\u1ee5 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng. N\u00f3 hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang.<\/p>\n<p>C\u00e1c m\u1ed1i quan h\u1ec7 ch\u00ednh c\u1ea7n m\u00f4 h\u00ecnh h\u00f3a bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Li\u00ean k\u1ebft:<\/strong>M\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac n\u01a1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi nhau. (v\u00ed d\u1ee5: M\u1ed9t <code>Gi\u00e1o vi\u00ean<\/code>gi\u1ea3ng d\u1ea1y <code>H\u1ecdc sinh<\/code>).<\/li>\n<li><strong>T\u1ed5ng h\u1ee3p:<\/strong>M\u1ed9t d\u1ea1ng y\u1ebfu c\u1ee7a li\u00ean k\u1ebft n\u01a1i to\u00e0n th\u1ec3 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n b\u1ed9 ph\u1eadn. (v\u00ed d\u1ee5: M\u1ed9t <code>Ph\u00f2ng ban<\/code>c\u00f3 <code>Th\u00e0nh vi\u00ean<\/code>; n\u1ebfu ph\u00f2ng ban \u0111\u00f3ng c\u1eeda, c\u00e1c th\u00e0nh vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i).<\/li>\n<li><strong>Th\u00e0nh ph\u1ea7n:<\/strong>M\u1ed9t d\u1ea1ng m\u1ea1nh c\u1ee7a li\u00ean k\u1ebft n\u01a1i b\u1ed9 ph\u1eadn kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. (v\u00ed d\u1ee5: M\u1ed9t <code>Ng\u00f4i nh\u00e0<\/code>c\u00f3 <code>Ph\u00f2ng<\/code>; n\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng c\u0169ng bi\u1ebfn m\u1ea5t).<\/li>\n<li><strong>K\u1ebf th\u1eeba:<\/strong>M\u1ed1i quan h\u1ec7 \u201cl\u00e0-m\u1ed9t\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn tr\u01b0\u1edbc \u0111\u00f3.<\/li>\n<\/ul>\n<h3>Thi\u1ebft k\u1ebf d\u1ef1a tr\u00ean tr\u00e1ch nhi\u1ec7m \ud83c\udfaf<\/h3>\n<p>Trong thi\u1ebft k\u1ebf, b\u1ea1n g\u00e1n tr\u00e1ch nhi\u1ec7m cho c\u00e1c l\u1edbp. M\u1ed9t tr\u00e1ch nhi\u1ec7m l\u00e0 \u0111i\u1ec1u m\u00e0 m\u1ed9t l\u1edbp bi\u1ebft ho\u1eb7c th\u1ef1c hi\u1ec7n. Kh\u00e1i ni\u1ec7m n\u00e0y gi\u00fap x\u00e1c \u0111\u1ecbnh n\u01a1i logic n\u00ean \u0111\u01b0\u1ee3c \u0111\u1eb7t.<\/p>\n<p>C\u00f3 ba lo\u1ea1i tr\u00e1ch nhi\u1ec7m ch\u00ednh:<\/p>\n<ul>\n<li><strong>\u1ea8n th\u00f4ng tin:<\/strong>M\u1ed9t l\u1edbp ch\u1ecbu tr\u00e1ch nhi\u1ec7m gi\u1eef tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3 \u1edf ch\u1ebf \u0111\u1ed9 ri\u00eang t\u01b0.<\/li>\n<li><strong>T\u00ednh to\u00e1n:<\/strong>M\u1ed9t l\u1edbp th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh (v\u00ed d\u1ee5: t\u00ednh thu\u1ebf).<\/li>\n<li><strong>T\u1ea1o l\u1eadp:<\/strong> M\u1ed9t l\u1edbp ch\u1ecbu tr\u00e1ch nhi\u1ec7m kh\u1edfi t\u1ea1o c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c.<\/li>\n<\/ul>\n<p>Khi ph\u00e2n c\u00f4ng tr\u00e1ch nhi\u1ec7m, h\u00e3y h\u01b0\u1edbng \u0111\u1ebfn s\u1ef1 g\u1eafn k\u1ebft cao v\u00e0 li\u00ean k\u1ebft th\u1ea5p.<\/p>\n<h3>G\u1eafn k\u1ebft cao, Li\u00ean k\u1ebft th\u1ea5p \u2696\ufe0f<\/h3>\n<p>\u0110\u00e2y l\u00e0 quy t\u1eafc v\u00e0ng trong thi\u1ebft k\u1ebf. N\u00f3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec v\u00e0 linh ho\u1ea1t.<\/p>\n<ul>\n<li><strong>G\u1eafn k\u1ebft cao:<\/strong> M\u1ed9t l\u1edbp n\u00ean c\u00f3 m\u1ed9t m\u1ee5c \u0111\u00edch duy nh\u1ea5t v\u00e0 r\u00f5 r\u00e0ng. N\u1ebfu m\u1ed9t l\u1edbp th\u1ef1c hi\u1ec7n n\u0103m vi\u1ec7c kh\u00f4ng li\u00ean quan, th\u00ec \u0111\u00f3 l\u00e0 g\u1eafn k\u1ebft th\u1ea5p. N\u1ebfu n\u00f3 ch\u1ec9 x\u1eed l\u00fd x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng, th\u00ec \u0111\u00f3 l\u00e0 g\u1eafn k\u1ebft cao.<\/li>\n<li><strong>Li\u00ean k\u1ebft th\u1ea5p:<\/strong> C\u00e1c l\u1edbp n\u00ean \u0111\u1ed9c l\u1eadp v\u1edbi nhau. N\u1ebfu b\u1ea1n thay \u0111\u1ed5i L\u1edbp A, L\u1edbp B kh\u00f4ng n\u00ean b\u1ecb h\u1ecfng. C\u00e1c ph\u1ee5 thu\u1ed9c c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u t\u1ed1i \u0111a.<\/li>\n<\/ul>\n<h2>Nguy\u00ean t\u1eafc v\u00e0 M\u1eabu thi\u1ebft k\u1ebf \ud83d\udcd0<\/h2>\n<p>Theo th\u1eddi gian, c\u1ed9ng \u0111\u1ed3ng \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u1eefng v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p l\u1eb7p l\u1ea1i. Nh\u1eefng \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1eabu thi\u1ebft k\u1ebf v\u00e0 nguy\u00ean t\u1eafc. Ch\u00fang cung c\u1ea5p m\u1ed9t t\u1eeb v\u1ef1ng \u0111\u1ec3 th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c quy\u1ebft \u0111\u1ecbnh thi\u1ebft k\u1ebf.<\/p>\n<h3>C\u00e1c nguy\u00ean t\u1eafc SOLID \ud83d\udcdc<\/h3>\n<p>N\u0103m nguy\u00ean t\u1eafc n\u00e0y h\u01b0\u1edbng d\u1eabn vi\u1ec7c t\u1ea1o ra ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec.<\/p>\n<ul>\n<li><strong>S \u2013 Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m \u0111\u01a1n nh\u1ea5t:<\/strong> M\u1ed9t l\u1edbp ch\u1ec9 n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi g\u1eafn k\u1ebft cao.<\/li>\n<li><strong>O \u2013 Nguy\u00ean t\u1eafc M\u1edf\/\u0110\u00f3ng:<\/strong> C\u00e1c th\u1ef1c th\u1ec3 ph\u1ea7n m\u1ec1m n\u00ean \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng nh\u01b0ng \u0111\u00f3ng \u0111\u1ed1i v\u1edbi thay \u0111\u1ed5i. B\u1ea1n th\u00eam h\u00e0nh vi m\u1edbi b\u1eb1ng c\u00e1ch th\u00eam c\u00e1c l\u1edbp m\u1edbi, ch\u1ee9 kh\u00f4ng ph\u1ea3i thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n hi\u1ec7n c\u00f3.<\/li>\n<li><strong>L \u2013 Nguy\u00ean t\u1eafc thay th\u1ebf Liskov:<\/strong> C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp cha n\u00ean c\u00f3 th\u1ec3 thay th\u1ebf b\u1eb1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp con m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o vi\u1ec7c k\u1ebf th\u1eeba \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch.<\/li>\n<li><strong>I \u2013 Nguy\u00ean t\u1eafc t\u00e1ch giao di\u1ec7n:<\/strong> C\u00e1c kh\u00e1ch h\u00e0ng kh\u00f4ng n\u00ean b\u1ecb bu\u1ed9c ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 ch\u00fang kh\u00f4ng s\u1eed d\u1ee5ng. Chia c\u00e1c giao di\u1ec7n l\u1edbn th\u00e0nh c\u00e1c giao di\u1ec7n nh\u1ecf h\u01a1n, c\u1ee5 th\u1ec3 h\u01a1n.<\/li>\n<li><strong>D \u2013 Nguy\u00ean t\u1eafc \u0111\u1ea3o ng\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c:<\/strong> Ph\u1ee5 thu\u1ed9c v\u00e0o tr\u1eebu t\u01b0\u1ee3ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u1ee5 th\u1ec3. C\u00e1c m\u00f4-\u0111un c\u1ea5p cao kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c m\u00f4-\u0111un c\u1ea5p th\u1ea5p. C\u1ea3 hai n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o tr\u1eebu t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n<h3>C\u00e1c m\u1eabu thi\u1ebft k\u1ebf ph\u1ed5 bi\u1ebfn \ud83e\udde9<\/h3>\n<p>C\u00e1c m\u1eabu l\u00e0 khu\u00f4n m\u1eabu \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn. Ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 \u0111o\u1ea1n m\u00e3 ng\u1eafn m\u00e0 l\u00e0 c\u00e1c c\u1ea5u tr\u00fac kh\u00e1i ni\u1ec7m.<\/p>\n<ul>\n<li><strong>M\u1eabu Factory:<\/strong> Cung c\u1ea5p m\u1ed9t giao di\u1ec7n \u0111\u1ec3 t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng trong l\u1edbp cha, cho ph\u00e9p c\u00e1c l\u1edbp con thay \u0111\u1ed5i lo\u1ea1i \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd \u0111\u01b0\u1ee3c t\u1ea1o. H\u1eefu \u00edch khi lo\u1ea1i \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh x\u00e1c ch\u01b0a bi\u1ebft cho \u0111\u1ebfn th\u1eddi \u0111i\u1ec3m ch\u1ea1y ch\u01b0\u01a1ng tr\u00ecnh.<\/li>\n<li><strong>M\u1eabu Quan s\u00e1t vi\u00ean:<\/strong> X\u00e1c \u0111\u1ecbnh c\u01a1 ch\u1ebf \u0111\u0103ng k\u00fd \u0111\u1ec3 th\u00f4ng b\u00e1o cho nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng v\u1ec1 c\u00e1c s\u1ef1 ki\u1ec7n. L\u00fd t\u01b0\u1edfng cho c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n, nh\u01b0 c\u1eadp nh\u1eadt giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng khi d\u1eef li\u1ec7u thay \u0111\u1ed5i.<\/li>\n<li><strong>M\u1eabu Chi\u1ebfn l\u01b0\u1ee3c:<\/strong> X\u00e1c \u0111\u1ecbnh m\u1ed9t gia \u0111\u00ecnh c\u00e1c thu\u1eadt to\u00e1n, \u0111\u00f3ng g\u00f3i t\u1eebng thu\u1eadt to\u00e1n v\u00e0 l\u00e0m cho ch\u00fang c\u00f3 th\u1ec3 thay th\u1ebf l\u1eabn nhau. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p thu\u1eadt to\u00e1n thay \u0111\u1ed5i \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c kh\u00e1ch h\u00e0ng s\u1eed d\u1ee5ng n\u00f3.<\/li>\n<\/ul>\n<h2>Tr\u1ef1c quan h\u00f3a ki\u1ebfn tr\u00fac \ud83d\uddbc\ufe0f<\/h2>\n<p>M\u1eb7c d\u00f9 v\u0103n b\u1ea3n v\u00e0 b\u1ea3ng bi\u1ec3u h\u1eefu \u00edch, nh\u01b0ng c\u00e1c s\u01a1 \u0111\u1ed3 tr\u1ef1c quan th\u01b0\u1eddng l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t c\u00e1c thi\u1ebft k\u1ebf ph\u1ee9c t\u1ea1p \u0111\u1ebfn c\u00e1c b\u00ean li\u00ean quan. Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) l\u00e0 ti\u00eau chu\u1ea9n cho c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y.<\/p>\n<h3>C\u00e1c s\u01a1 \u0111\u1ed3 UML ch\u00ednh<\/h3>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i s\u01a1 \u0111\u1ed3<\/th>\n<th>M\u1ee5c \u0111\u00edch<\/th>\n<th>Tr\u1ecdng t\u00e2m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>S\u01a1 \u0111\u1ed3 l\u1edbp<\/strong><\/td>\n<td>C\u1ea5u tr\u00fac t\u0129nh<\/td>\n<td>L\u1edbp, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/strong><\/td>\n<td>H\u00e0nh vi \u0111\u1ed9ng<\/td>\n<td>T\u01b0\u01a1ng t\u00e1c theo th\u1eddi gian gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong><\/td>\n<td>Y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng<\/td>\n<td>Ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1ee5c ti\u00eau h\u1ec7 th\u1ed1ng<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i<\/strong><\/td>\n<td>Chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i<\/td>\n<td>Tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 c\u00e1c s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t thay \u0111\u1ed5i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u1ed9i ng\u0169 c\u00f3 c\u00f9ng m\u1ed9t hi\u1ec3u bi\u1ebft chung v\u1ec1 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng. Ch\u00fang \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o, lu\u00f4n ch\u00ednh x\u00e1c mi\u1ec5n l\u00e0 m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt.<\/p>\n<h2>Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n<p>Ngay c\u1ea3 khi \u0111\u00e3 n\u1eafm v\u1eefng c\u00e1c nguy\u00ean t\u1eafc, v\u1eabn d\u1ec5 m\u1eafc sai l\u1ea7m trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng b\u1eaby ph\u1ed5 bi\u1ebfn n\u00e0y c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m r\u1ea5t nhi\u1ec1u th\u1eddi gian trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n<h3>1. M\u00f4 h\u00ecnh mi\u1ec1n tr\u1ed1ng r\u1ed7ng \ud83d\udeab<\/h3>\n<p>\u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi c\u00e1c l\u1edbp ch\u1ec9 ch\u1ee9a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u1ea5y gi\u00e1 tr\u1ecb (getters) v\u00e0 thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb (setters), kh\u00f4ng c\u00f3 logic kinh doanh n\u00e0o. \u0110i\u1ec1u n\u00e0y \u0111\u1ea9y logic v\u00e0o c\u00e1c l\u1edbp d\u1ecbch v\u1ee5, t\u1ea1o ra c\u00e1c &#8220;script giao d\u1ecbch&#8221; vi ph\u1ea1m t\u00ednh \u0111\u00f3ng g\u00f3i. C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00ean t\u1ef1 gi\u1eef logic c\u1ee7a ch\u00ednh ch\u00fang.<\/p>\n<h3>2. Thi\u1ebft k\u1ebf qu\u00e1 m\u1ee9c \ud83c\udfd7\ufe0f<\/h3>\n<p>Vi\u1ec7c th\u00eam c\u00e1c m\u1eabu thi\u1ebft k\u1ebf ph\u1ee9c t\u1ea1p v\u00e0 tr\u1eebu t\u01b0\u1ee3ng tr\u01b0\u1edbc khi c\u1ea7n thi\u1ebft s\u1ebd t\u1ea1o ra s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft. YAGNI (B\u1ea1n s\u1ebd kh\u00f4ng c\u1ea7n \u0111\u1ebfn n\u00f3) l\u00e0 nguy\u00ean t\u1eafc \u0111\u1ecbnh h\u01b0\u1edbng. H\u00e3y x\u00e2y d\u1ef1ng gi\u1ea3i ph\u00e1p \u0111\u01a1n gi\u1ea3n nh\u1ea5t c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng cho c\u00e1c y\u00eau c\u1ea7u hi\u1ec7n t\u1ea1i.<\/p>\n<h3>3. C\u1ea5u tr\u00fac k\u1ebf th\u1eeba s\u00e2u \ud83c\udf33<\/h3>\n<p>Vi\u1ec7c t\u1ea1o ra c\u00e1c l\u1edbp c\u00f3 c\u1ea5u tr\u00fac k\u1ebf th\u1eeba s\u00e2u \u0111\u1ebfn 10 c\u1ea5p \u0111\u1ed9 s\u1ebd khi\u1ebfn h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean c\u1ee9ng nh\u1eafc. K\u1ebf th\u1eeba n\u00ean \u0111\u01b0\u1ee3c gi\u1eef \u1edf m\u1ee9c n\u00f4ng. \u01afu ti\u00ean s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p (c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ee9a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c) thay v\u00ec k\u1ebf th\u1eeba khi c\u00f3 th\u1ec3. \u0110i\u1ec1u n\u00e0y mang l\u1ea1i t\u00ednh linh ho\u1ea1t h\u01a1n.<\/p>\n<h3>4. B\u1ecf qua c\u00e1c y\u00eau c\u1ea7u phi ch\u1ee9c n\u0103ng \ud83d\udcc9<\/h3>\n<p>Ph\u00e2n t\u00edch th\u01b0\u1eddng t\u1eadp trung v\u00e0o c\u00e1c t\u00ednh n\u0103ng (y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng). Tuy nhi\u00ean, hi\u1ec7u su\u1ea5t, b\u1ea3o m\u1eadt v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng (y\u00eau c\u1ea7u phi ch\u1ee9c n\u0103ng) ph\u1ea3i \u0111\u01b0\u1ee3c xem x\u00e9t t\u1eeb \u0111\u1ea7u. M\u1ed9t thi\u1ebft k\u1ebf ho\u1ea1t \u0111\u1ed9ng v\u1ec1 m\u1eb7t ch\u1ee9c n\u0103ng nh\u01b0ng s\u1eadp khi t\u1ea3i cao l\u00e0 m\u1ed9t thi\u1ebft k\u1ebf th\u1ea5t b\u1ea1i.<\/p>\n<h2>L\u1eb7p l\u1ea1i v\u00e0 tinh ch\u1ec9nh \ud83d\udd04<\/h2>\n<p>OOAD kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n duy nh\u1ea5t. \u0110\u00f3 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i. Khi b\u1ea1n tri\u1ec3n khai h\u1ec7 th\u1ed1ng, b\u1ea1n s\u1ebd ph\u00e1t hi\u1ec7n ra c\u00e1c y\u00eau c\u1ea7u m\u1edbi ho\u1eb7c nh\u1eefng \u0111i\u1ec3m y\u1ebfu trong thi\u1ebft k\u1ebf ban \u0111\u1ea7u. \u0110i\u1ec1u n\u00e0y l\u00e0 b\u00ecnh th\u01b0\u1eddng.<\/p>\n<ul>\n<li><strong>T\u00e1i c\u1ea5u tr\u00fac:<\/strong> Qu\u00e1 tr\u00ecnh t\u00e1i c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n hi\u1ec7n c\u00f3 m\u00e0 kh\u00f4ng thay \u0111\u1ed5i h\u00e0nh vi b\u00ean ngo\u00e0i c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n c\u1ea3i thi\u1ec7n thi\u1ebft k\u1ebf t\u1eebng b\u01b0\u1edbc m\u1ed9t.<\/li>\n<li><strong>V\u00f2ng ph\u1ea3n h\u1ed3i:<\/strong> Th\u01b0\u1eddng xuy\u00ean xem x\u00e9t m\u00e3 ngu\u1ed3n so v\u1edbi thi\u1ebft k\u1ebf. N\u1ebfu m\u00e3 ngu\u1ed3n l\u1ec7ch kh\u1ecfi thi\u1ebft k\u1ebf m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3, h\u00e3y c\u1eadp nh\u1eadt thi\u1ebft k\u1ebf \u0111\u1ec3 ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf.<\/li>\n<\/ul>\n<p>T\u00e0i li\u1ec7u n\u00ean \u0111\u01b0\u1ee3c gi\u1eef \u0111\u01a1n gi\u1ea3n. C\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a qu\u00e1 m\u1ee9c s\u1ebd nhanh ch\u00f3ng l\u1ed7i th\u1eddi. H\u00e3y t\u1eadp trung v\u00e0o vi\u1ec7c ghi l\u1ea1i nh\u1eefng quy\u1ebft \u0111\u1ecbnh kh\u00f4ng r\u00f5 r\u00e0ng ho\u1eb7c quan tr\u1ecdng \u0111\u1ed1i v\u1edbi vi\u1ec7c b\u1ea3o tr\u00ec trong t\u01b0\u01a1ng lai.<\/p>\n<h2>Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd \ud83d\ude80<\/h2>\n<p>Th\u00e0nh th\u1ea1o Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t h\u00e0nh tr\u00ecnh, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u00edch \u0111\u1ebfn. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi th\u1ef1c h\u00e0nh, quan s\u00e1t v\u00e0 tinh th\u1ea7n s\u1eb5n s\u00e0ng \u0111\u1eb7t c\u00e2u h\u1ecfi cho c\u00e1c gi\u1ea3 \u0111\u1ecbnh. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i nh\u01b0 \u0111\u00f3ng g\u00f3i, tr\u1eebu t\u01b0\u1ee3ng v\u00e0 tr\u00e1ch nhi\u1ec7m r\u00f5 r\u00e0ng, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t m\u00e0 c\u00f2n linh ho\u1ea1t.<\/p>\n<p>M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ea1o ra m\u00e3 ho\u00e0n h\u1ea3o ngay t\u1eeb l\u1ea7n \u0111\u1ea7u ti\u00ean. M\u1ee5c ti\u00eau l\u00e0 t\u1ea1o ra m\u1ed9t n\u1ec1n t\u1ea3ng cho ph\u00e9p ph\u00e1t tri\u1ec3n. Khi b\u1ea1n hi\u1ec3u \u0111\u01b0\u1ee3c &#8216;t\u1ea1i sao&#8217; \u0111\u1eb1ng sau c\u00e1c quy\u1ebft \u0111\u1ecbnh thi\u1ebft k\u1ebf, b\u1ea1n c\u00f3 th\u1ec3 x\u1eed l\u00fd nh\u1eefng thay \u0111\u1ed5i m\u1ed9t c\u00e1ch t\u1ef1 tin. D\u00f9 b\u1ea1n \u0111ang l\u00e0m vi\u1ec7c tr\u00ean m\u1ed9t \u0111o\u1ea1n m\u00e3 nh\u1ecf hay m\u1ed9t \u1ee9ng d\u1ee5ng doanh nghi\u1ec7p quy m\u00f4 l\u1edbn, nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y cung c\u1ea5p s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ea7n thi\u1ebft \u0111\u1ec3 mang l\u1ea1i gi\u00e1 tr\u1ecb m\u1ed9t c\u00e1ch nh\u1ea5t qu\u00e1n.<\/p>\n<p>V\u1eabn ti\u1ebfp t\u1ee5c h\u1ecdc h\u1ecfi, ti\u1ebfp t\u1ee5c thi\u1ebft k\u1ebf, v\u00e0 lu\u00f4n \u01b0u ti\u00ean s\u1ef1 r\u00f5 r\u00e0ng h\u01a1n l\u00e0 s\u1ef1 kh\u00e9o l\u00e9o.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u1ed1i c\u1ea3nh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t \u1ee9ng d\u1ee5ng d\u1ec5 v\u1ee1 v\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc th\u01b0\u1eddng n\u1eb1m \u1edf c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh&hellip;<\/p>\n","protected":false},"author":1,"featured_media":107,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Gi\u1edbi thi\u1ec7u c\u01a1 b\u1ea3n v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udcd0 C\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 OOAD, c\u00e1c m\u1eabu thi\u1ebft k\u1ebf v\u00e0 ki\u1ebfn tr\u00fac d\u00e0nh cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n.","inline_featured_image":false,"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[14],"tags":[6,13],"class_list":["post-106","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-object-oriented-analysis-and-design","tag-academic","tag-object-oriented-analysis-and-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gi\u1edbi thi\u1ec7u c\u01a1 b\u1ea3n v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udcd0 C\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i v\u1ec1 Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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