{"id":849,"date":"2026-03-24T20:49:47","date_gmt":"2026-03-24T20:49:47","guid":{"rendered":"https:\/\/www.visualize-ai.com\/vi\/building-scalable-systems-polymorphism-inheritance\/"},"modified":"2026-03-24T20:49:47","modified_gmt":"2026-03-24T20:49:47","slug":"building-scalable-systems-polymorphism-inheritance","status":"publish","type":"post","link":"https:\/\/www.visualize-ai.com\/vi\/building-scalable-systems-polymorphism-inheritance\/","title":{"rendered":"X\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng: S\u1ee9c m\u1ea1nh c\u1ee7a \u0111a h\u00ecnh v\u00e0 k\u1ebf th\u1eeba"},"content":{"rendered":"<p>Trong b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m, ki\u1ebfn tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u1eddng quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 b\u1ec1n c\u1ee7a n\u00f3. Khi c\u00e1c \u1ee9ng d\u1ee5ng ng\u00e0y c\u00e0ng ph\u1ee9c t\u1ea1p, m\u00e3 ngu\u1ed3n ph\u1ea3i ph\u00e1t tri\u1ec3n m\u00e0 kh\u00f4ng b\u1ecb s\u1ee5p \u0111\u1ed5 d\u01b0\u1edbi ch\u00ednh tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3. Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng cung c\u1ea5p m\u1ed9t khung n\u1ec1n t\u1ea3ng \u0111\u1ec3 qu\u1ea3n l\u00fd s\u1ef1 ph\u1ee9c t\u1ea1p n\u00e0y. Hai tr\u1ee5 c\u1ed9t trong khung n\u00e0y n\u1ed5i b\u1eadt nh\u1edd kh\u1ea3 n\u0103ng th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e1t tri\u1ec3n: k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh. Nh\u1eefng c\u01a1 ch\u1ebf n\u00e0y cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t h\u00f4m nay m\u00e0 c\u00f2n linh ho\u1ea1t cho ng\u00e0y mai.<\/p>\n<p>Khi thi\u1ebft k\u1ebf c\u00e1c gi\u1ea3i ph\u00e1p c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, m\u1ee5c ti\u00eau l\u00e0 t\u1ed1i thi\u1ec3u h\u00f3a chi ph\u00ed thay \u0111\u1ed5i. M\u1ed7i t\u00ednh n\u0103ng ho\u1eb7c y\u00eau c\u1ea7u m\u1edbi n\u00ean \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p m\u1ed9t c\u00e1ch tr\u01a1n tru v\u00e0o c\u1ea5u tr\u00fac hi\u1ec7n c\u00f3. S\u1ef1 t\u00edch h\u1ee3p n\u00e0y ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o c\u00e1ch c\u00e1c l\u1edbp li\u00ean k\u1ebft v\u1edbi nhau v\u00e0 c\u00e1ch h\u00e0nh vi \u0111\u01b0\u1ee3c ph\u00e2n ph\u00e1t. B\u1eb1ng c\u00e1ch t\u1eadn d\u1ee5ng k\u1ebf th\u1eeba, ch\u00fang ta thi\u1ebft l\u1eadp c\u00e1c c\u1ea5p b\u1eadc r\u00f5 r\u00e0ng v\u00e0 c\u00e1c h\u00e0nh vi chung. Qua \u0111a h\u00ecnh, ch\u00fang ta \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft chi ti\u1ebft c\u1ee5 th\u1ec3 c\u1ee7a nhau. C\u00f9ng nhau, ch\u00fang t\u1ea1o th\u00e0nh m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c v\u1eefng ch\u1eafc \u0111\u1ec3 duy tr\u00ec kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng v\u00e0 gi\u1ea3m n\u1ee3 k\u1ef9 thu\u1eadt.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Chalkboard-style educational infographic explaining polymorphism and inheritance in software engineering: visual diagrams show class hierarchies, interface-based polymorphism, Open\/Closed Principle benefits, common pitfalls to avoid, and best-practice decision table for building scalable, maintainable systems\" decoding=\"async\" src=\"https:\/\/www.visualize-ai.com\/wp-content\/uploads\/2026\/03\/polymorphism-inheritance-scalable-systems-chalkboard-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>Hi\u1ec3u v\u1ec1 k\u1ebf th\u1eeba: N\u1ec1n t\u1ea3ng c\u1ee7a kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng \ud83d\udd17<\/h2>\n<p>K\u1ebf th\u1eeba l\u00e0 c\u01a1 ch\u1ebf m\u00e0 theo \u0111\u00f3 m\u1ed9t l\u1edbp thu \u0111\u01b0\u1ee3c c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a m\u1ed9t l\u1edbp kh\u00e1c. M\u1ed1i quan h\u1ec7 n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 l\u00e0 m\u1ed9t <strong>l\u00e0-m\u1ed9t<\/strong>m\u1ed1i quan h\u1ec7. N\u1ebfu m\u1ed9t <code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code>l\u00e0 m\u1ed9t lo\u1ea1i c\u1ee7a <code>V\u1eadn chuy\u1ec3n<\/code>, th\u00ec <code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code>k\u1ebf th\u1eeba kh\u1ea3 n\u0103ng t\u1eeb <code>V\u1eadn chuy\u1ec3n<\/code>. Kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng cho vi\u1ec7c t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd.<\/p>\n<h3>C\u01a1 ch\u1ebf c\u1ee7a c\u00e1c c\u1ea5p b\u1eadc l\u1edbp<\/h3>\n<p>\u1ede c\u1ed1t l\u00f5i, k\u1ebf th\u1eeba cho ph\u00e9p t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n. Thay v\u00ec l\u1eb7p l\u1ea1i logic tr\u00ean nhi\u1ec1u l\u1edbp, ch\u1ee9c n\u0103ng chung \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong m\u1ed9t l\u1edbp cha. C\u00e1c l\u1edbp con sau \u0111\u00f3 m\u1edf r\u1ed9ng ch\u1ee9c n\u0103ng n\u00e0y. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch r\u00f5 r\u1ec7t:<\/p>\n<ul>\n<li>\n<p><strong>Nguy\u00ean t\u1eafc DRY:<\/strong> Nguy\u00ean t\u1eafc Kh\u00f4ng L\u1eb7p L\u1ea1i \u0110i\u1ec1u G\u00ec (Don\u2019t Repeat Yourself) \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean. C\u00e1c ph\u01b0\u01a1ng th\u1ee9c chung \u0111\u01b0\u1ee3c \u0111\u1eb7t trong l\u1edbp si\u00eau c\u1ea5p.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong> T\u1ea5t c\u1ea3 c\u00e1c l\u1edbp con tu\u00e2n theo m\u1ed9t giao di\u1ec7n chu\u1ea9n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi l\u1edbp cha.<\/p>\n<\/li>\n<li>\n<p><strong>Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a:<\/strong> C\u00e1c l\u1edbp cha c\u00f3 th\u1ec3 \u0111\u1ecbnh ngh\u0129a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng bu\u1ed9c c\u00e1c l\u1edbp con ph\u1ea3i tri\u1ec3n khai c\u00e1c h\u00e0nh vi c\u1ee5 th\u1ec3.<\/p>\n<\/li>\n<\/ul>\n<p>H\u00e3y xem x\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng khi b\u1ea1n \u0111ang x\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng th\u00f4ng b\u00e1o. B\u1ea1n c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t l\u1edbp c\u01a1 s\u1edf \u0111\u1ea1i di\u1ec7n cho m\u1ed9t tin nh\u1eafn chung. C\u00e1c lo\u1ea1i c\u1ee5 th\u1ec3 nh\u01b0 email, SMS v\u00e0 th\u00f4ng b\u00e1o \u0111\u1ea9y s\u1ebd k\u1ebf th\u1eeba t\u1eeb l\u1edbp c\u01a1 s\u1edf n\u00e0y. L\u1edbp c\u01a1 s\u1edf x\u1eed l\u00fd vi\u1ec7c \u0111\u1ecbnh d\u1ea1ng th\u1eddi gian \u0111\u00e1nh d\u1ea5u v\u00e0 ghi l\u1ea1i n\u1ed7 l\u1ef1c g\u1eedi. C\u00e1c l\u1edbp con x\u1eed l\u00fd logic truy\u1ec1n t\u1ea3i c\u1ee5 th\u1ec3.<\/p>\n<h3>M\u1ee9c \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n<p>K\u1ebf th\u1eeba hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi ph\u1ea3i l\u00ean k\u1ebf ho\u1ea1ch c\u1ea9n th\u1eadn v\u1ec1 c\u00e1c m\u1ee9c \u0111\u1ed9 tr\u1eebu t\u01b0\u1ee3ng. M\u1ed9t c\u1ea5p b\u1eadc s\u00e2u c\u00f3 th\u1ec3 tr\u1edf n\u00ean kh\u00f3 b\u1ea3o tr\u00ec. T\u1ed1t nh\u1ea5t l\u00e0 gi\u1eef c\u00e1c c\u1ea5p b\u1eadc \u1edf d\u1ea1ng ph\u1eb3ng tr\u1eeb khi c\u00f3 nhu c\u1ea7u r\u00f5 r\u00e0ng v\u1ec1 chuy\u00ean bi\u1ec7t h\u00f3a.<\/p>\n<ul>\n<li>\n<p><strong>L\u1edbp c\u1ee5 th\u1ec3:<\/strong> Nh\u1eefng l\u1edbp n\u00e0y tri\u1ec3n khai t\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o tr\u1ef1c ti\u1ebfp.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1edbp tr\u1eebu t\u01b0\u1ee3ng:<\/strong> Nh\u1eefng l\u1edbp n\u00e0y c\u00f3 th\u1ec3 ch\u1ee9a c\u00e1c tri\u1ec3n khai ch\u01b0a ho\u00e0n ch\u1ec9nh v\u00e0 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o.<\/p>\n<\/li>\n<li>\n<p><strong>Giao di\u1ec7n:<\/strong> Ch\u00fang \u0111\u1ecbnh ngh\u0129a m\u1ed9t h\u1ee3p \u0111\u1ed3ng v\u1ec1 h\u00e0nh vi m\u00e0 kh\u00f4ng cung c\u1ea5p chi ti\u1ebft tri\u1ec3n khai.<\/p>\n<\/li>\n<\/ul>\n<p>Khi thi\u1ebft k\u1ebf c\u00e1c c\u1ea5p n\u00e0y, h\u00e3y t\u1ef1 h\u1ecfi xem l\u1edbp con th\u1ef1c s\u1ef1 c\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t phi\u00ean b\u1ea3n chuy\u00ean bi\u1ec7t c\u1ee7a l\u1edbp cha hay kh\u00f4ng. N\u1ebfu m\u1ed1i quan h\u1ec7 y\u1ebfu, vi\u1ec7c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1t h\u01a1n so v\u1edbi k\u1ebf th\u1eeba.<\/p>\n<h2>\u0110a h\u00ecnh: T\u00ednh linh ho\u1ea1t th\u00f4ng qua kh\u1ea3 n\u0103ng thay th\u1ebf \ud83d\udd04<\/h2>\n<p>\u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 th\u1ec3 ch\u00fang l\u00e0 th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp cha thay v\u00ec l\u1edbp th\u1ef1c t\u1ebf c\u1ee7a ch\u00fang. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p m\u00e3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 ki\u1ec3u kh\u00e1c nhau th\u00f4ng qua m\u1ed9t giao di\u1ec7n chung. Thu\u1eadt ng\u1eef n\u00e0y b\u1eaft ngu\u1ed3n t\u1eeb g\u1ed1c Hy L\u1ea1p c\u00f3 ngh\u0129a l\u00e0<strong>nhi\u1ec1u h\u00ecnh th\u1ee9c<\/strong>.<\/p>\n<h3>\u0110a h\u00ecnh t\u0129nh so v\u1edbi \u0111a h\u00ecnh \u0111\u1ed9ng<\/h3>\n<p>\u0110a h\u00ecnh th\u1ec3 hi\u1ec7n theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau trong v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng.<\/p>\n<ul>\n<li>\n<p><strong>\u0110a h\u00ecnh th\u1eddi gian bi\u00ean d\u1ecbch:<\/strong> C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ghi \u0111\u00e8 ph\u01b0\u01a1ng th\u1ee9c. Nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c chia s\u1ebb c\u00f9ng t\u00ean nh\u01b0ng kh\u00e1c nhau v\u1ec1 danh s\u00e1ch tham s\u1ed1. B\u1ed9 bi\u00ean d\u1ecbch s\u1ebd quy\u1ebft \u0111\u1ecbnh ph\u01b0\u01a1ng th\u1ee9c n\u00e0o \u0111\u01b0\u1ee3c g\u1ecdi d\u1ef1a tr\u00ean c\u00e1c \u0111\u1ed1i s\u1ed1 \u0111\u01b0\u1ee3c cung c\u1ea5p.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110a h\u00ecnh th\u1eddi gian ch\u1ea1y:<\/strong> C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ph\u00e2n ph\u1ed1i \u0111\u1ed9ng. Ph\u01b0\u01a1ng th\u1ee9c c\u1ea7n th\u1ef1c thi \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y d\u1ef1a tr\u00ean ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c t\u1ebf. \u0110\u00e2y l\u00e0 y\u1ebfu t\u1ed1 ch\u00ednh th\u00fac \u0111\u1ea9y t\u00ednh linh ho\u1ea1t trong c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng.<\/p>\n<\/li>\n<\/ul>\n<h3>S\u1ee9c m\u1ea1nh c\u1ee7a s\u1ef1 nh\u1ea5t qu\u00e1n giao di\u1ec7n<\/h3>\n<p>Khi \u0111a h\u00ecnh \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u00fang c\u00e1ch, m\u00e3 kh\u00e1ch h\u00e0ng kh\u00f4ng c\u1ea7n bi\u1ebft ki\u1ec3u c\u1ee5 th\u1ec3 c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 n\u00f3 \u0111ang thao t\u00e1c. N\u00f3 ch\u1ec9 c\u1ea7n bi\u1ebft giao di\u1ec7n. \u0110i\u1ec1u n\u00e0y t\u00e1ch bi\u1ec7t kh\u00e1ch h\u00e0ng kh\u1ecfi chi ti\u1ebft tri\u1ec3n khai.<\/p>\n<p>V\u00ed d\u1ee5, m\u1ed9t lu\u1ed3ng x\u1eed l\u00fd c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn m\u1ed9t lu\u1ed3ng c\u00e1c<code>Processor<\/code>\u0111\u1ed1i t\u01b0\u1ee3ng. Lu\u1ed3ng x\u1eed l\u00fd kh\u00f4ng quan t\u00e2m \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 l\u00e0 m\u1ed9t<code>TextProcessor<\/code>hay m\u1ed9t<code>ImageProcessor<\/code>. N\u00f3 ch\u1ec9 \u0111\u01a1n gi\u1ea3n g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c<code>process()<\/code>tr\u00ean m\u1ed7i m\u1ee5c trong lu\u1ed3ng. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p th\u00eam c\u00e1c b\u1ed9 x\u1eed l\u00fd m\u1edbi v\u00e0o h\u1ec7 th\u1ed1ng m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i logic lu\u1ed3ng x\u1eed l\u00fd.<\/p>\n<h2>K\u1ebft h\u1ee3p k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng \ud83d\ude80<\/h2>\n<p>S\u1eed d\u1ee5ng c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y ri\u00eang l\u1ebb s\u1ebd \u00edt hi\u1ec7u qu\u1ea3 h\u01a1n so v\u1edbi vi\u1ec7c s\u1eed d\u1ee5ng ch\u00fang c\u00f9ng nhau. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng v\u1eeba c\u00f3 t\u00ednh module v\u1eeba c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. S\u1ef1 ph\u1ed1i h\u1ee3p n\u00e0y th\u01b0\u1eddng l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 x\u1eed l\u00fd s\u1ef1 ph\u00e1t tri\u1ec3n m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i.<\/p>\n<h3>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i<\/h3>\n<p>M\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean c\u00e1c nguy\u00ean t\u1eafc n\u00e0y tu\u00e2n theo Nguy\u00ean t\u1eafc M\u1edf\/\u0110\u00f3ng. H\u1ec7 th\u1ed1ng m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c nh\u01b0ng \u0111\u00f3ng v\u1edbi vi\u1ec7c s\u1eeda \u0111\u1ed5i. Khi c\u00f3 y\u00eau c\u1ea7u m\u1edbi xu\u1ea5t hi\u1ec7n, b\u1ea1n t\u1ea1o ra m\u1ed9t l\u1edbp con m\u1edbi ho\u1eb7c tri\u1ec3n khai m\u1edbi. B\u1ea1n kh\u00f4ng c\u1ea7n ch\u1ea1m v\u00e0o m\u00e3 hi\u1ec7n c\u00f3 \u0111ang s\u1eed d\u1ee5ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y.<\/p>\n<ul>\n<li>\n<p><strong>T\u00ednh n\u0103ng m\u1edbi:<\/strong>Th\u00eam m\u1ed9t l\u1edbp con m\u1edbi k\u1ebf th\u1eeba t\u1eeb l\u1edbp c\u01a1 s\u1edf.<\/p>\n<\/li>\n<li>\n<p><strong>Thay \u0111\u1ed5i h\u00e0nh vi:<\/strong> Ghi \u0111\u00e8 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ee5 th\u1ec3 trong l\u1edbp m\u1edbi.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00edch h\u1ee3p:<\/strong> Logic hi\u1ec7n t\u1ea1i t\u1ef1 \u0111\u1ed9ng h\u1ed7 tr\u1ee3 l\u1edbp m\u1edbi nh\u1edd t\u00ednh \u0111a h\u00ecnh.<\/p>\n<\/li>\n<\/ul>\n<h3>Logic t\u00e1ch r\u1eddi<\/h3>\n<p>T\u00ednh \u0111a h\u00ecnh gi\u1ea3m s\u1ef1 ph\u1ee5 thu\u1ed9c gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n. S\u1ef1 ph\u1ee5 thu\u1ed9c n\u1eb1m \u1edf tr\u1eebu t\u01b0\u1ee3ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i tri\u1ec3n khai c\u1ee5 th\u1ec3. \u0110i\u1ec1u n\u00e0y gi\u00fap ki\u1ec3m th\u1eed d\u1ec5 d\u00e0ng h\u01a1n v\u00e0 cho ph\u00e9p c\u00e1c ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c thay th\u1ebf \u0111\u1ed9c l\u1eadp.<\/p>\n<p>Trong ki\u1ebfn tr\u00fac c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea3i c\u00f3 th\u1ec3 thay th\u1ebf \u0111\u01b0\u1ee3c. N\u1ebfu m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 tr\u1edf n\u00ean qu\u00e1 ch\u1eadm, c\u00f3 th\u1ec3 ch\u00e8n tri\u1ec3n khai m\u1edbi m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda l\u1ea1i logic kinh doanh t\u01b0\u01a1ng t\u00e1c v\u1edbi l\u1edbp d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y l\u00e0 kh\u1ea3 thi v\u00ec logic kinh doanh t\u01b0\u01a1ng t\u00e1c v\u1edbi giao di\u1ec7n, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u1edbp c\u1ee5 th\u1ec3.<\/p>\n<h2>Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn v\u00e0 m\u1eabu ch\u1ed1ng l\u1ea1i t\u1ed1t \u26a0\ufe0f<\/h2>\n<p>M\u1eb7c d\u00f9 m\u1ea1nh m\u1ebd, nh\u01b0ng nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y c\u00f3 th\u1ec3 b\u1ecb l\u1ea1m d\u1ee5ng. Vi\u1ec7c \u00e1p d\u1ee5ng kh\u00f4ng \u0111\u00fang d\u1eabn \u0111\u1ebfn m\u00e3 ngu\u1ed3n d\u1ec5 g\u00e3y, kh\u00f3 b\u1ea3o tr\u00ec h\u01a1n c\u1ea3 m\u00e3 kh\u00f4ng d\u00f9ng ch\u00fang. Nh\u1eadn th\u1ee9c v\u1ec1 nh\u1eefng sai l\u1ea7m n\u00e0y l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 vi\u1ebft h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc.<\/p>\n<h3>V\u1ea5n \u0111\u1ec1 l\u1edbp c\u01a1 s\u1edf d\u1ec5 g\u00e3y<\/h3>\n<p>Nh\u1eefng thay \u0111\u1ed5i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean l\u1edbp c\u01a1 s\u1edf c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh l\u00e0m h\u1ecfng c\u00e1c l\u1edbp con. N\u1ebfu l\u1edbp cha ph\u1ee5 thu\u1ed9c v\u00e0o tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 m\u00e0 l\u1edbp con cho r\u1eb1ng t\u1ed3n t\u1ea1i, vi\u1ec7c s\u1eeda \u0111\u1ed5i l\u1edbp cha c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng l\u1edbp con. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u \u0111i\u1ec1u n\u00e0y, h\u00e3y gi\u1eef cho c\u00e1c l\u1edbp c\u01a1 s\u1edf \u1ed5n \u0111\u1ecbnh v\u00e0 t\u1ed1i thi\u1ec3u h\u00f3a c\u00e1c ph\u1ee5 thu\u1ed9c ch\u00fang t\u1ea1o ra \u0111\u1ed1i v\u1edbi c\u00e1c l\u1edbp con.<\/p>\n<h3>C\u00e1c c\u1ea5p k\u1ebf th\u1eeba s\u00e2u<\/h3>\n<p>T\u1ea1o ra c\u00e1c chu\u1ed7i k\u1ebf th\u1eeba qu\u00e1 d\u00e0i khi\u1ebfn m\u00e3 ngu\u1ed3n kh\u00f3 hi\u1ec3u. Vi\u1ec7c g\u1ee1 l\u1ed7i m\u1ed9t chu\u1ed7i g\u1ecdi tr\u1ea3i d\u00e0i \u0111\u1ebfn m\u01b0\u1eddi c\u1ea5p \u0111\u1ed9 l\u00e0 kh\u00f4ng hi\u1ec7u qu\u1ea3. H\u00e3y nh\u1eafm \u0111\u1ebfn \u0111\u1ed9 s\u00e2u t\u1ed1i \u0111a l\u00e0 hai ho\u1eb7c ba c\u1ea5p. N\u1ebfu b\u1ea1n nh\u1eadn th\u1ea5y m\u00ecnh \u0111ang t\u1ea1o c\u00e1c c\u1ea5p k\u1ebf th\u1eeba s\u00e2u h\u01a1n, h\u00e3y c\u00e2n nh\u1eafc tr\u00edch xu\u1ea5t h\u00e0nh vi chung v\u00e0o c\u00e1c mixin ri\u00eang bi\u1ec7t ho\u1eb7c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p (composition).<\/p>\n<h3>S\u1ef1 ph\u1ee5 thu\u1ed9c ch\u1eb7t ch\u1ebd th\u00f4ng qua k\u1ebf th\u1eeba<\/h3>\n<p>K\u1ebf th\u1eeba t\u1ea1o ra m\u1ed1i li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd gi\u1eefa cha v\u00e0 con. N\u1ebfu cha thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3, con c\u0169ng ph\u1ea3i thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y vi ph\u1ea1m mong mu\u1ed1n v\u1ec1 s\u1ef1 ph\u1ee5 thu\u1ed9c l\u1ecfng l\u1ebbo. Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, k\u1ebft h\u1ee3p (composition) l\u00e0 l\u1ef1a ch\u1ecdn \u01b0u vi\u1ec7t h\u01a1n. K\u1ebft h\u1ee3p cho ph\u00e9p h\u00e0nh vi \u0111\u01b0\u1ee3c th\u00eam ho\u1eb7c lo\u1ea1i b\u1ecf t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, trong khi k\u1ebf th\u1eeba l\u00e0 c\u1ed1 \u0111\u1ecbnh t\u1ea1i th\u1eddi \u0111i\u1ec3m bi\u00ean d\u1ecbch.<\/p>\n<h2>C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho vi\u1ec7c tri\u1ec3n khai \ud83d\udccb<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n v\u1eabn c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, h\u00e3y tu\u00e2n theo m\u1ed9t b\u1ed9 h\u01b0\u1edbng d\u1eabn khi \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc n\u00e0y. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y n\u00eau r\u00f5 c\u00e1ch ti\u1ebfp c\u1eadn \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c nhau.<\/p>\n<table style=\"min-width: 75px;\">\n<colgroup>\n<col style=\"min-width: 25px;\"\/>\n<col style=\"min-width: 25px;\"\/>\n<col style=\"min-width: 25px;\"\/><\/colgroup>\n<tbody>\n<tr>\n<th colspan=\"1\" rowspan=\"1\">\n<p>T\u00ecnh hu\u1ed1ng<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>Ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>L\u00fd do<\/p>\n<\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>H\u00e0nh vi chung gi\u1eefa c\u00e1c l\u1edbp kh\u00f4ng li\u00ean quan<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Giao di\u1ec7n ho\u1eb7c Mixins<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Tr\u00e1nh bu\u1ed9c m\u1ed1i quan h\u1ec7 cha-con khi kh\u00f4ng t\u1ed3n t\u1ea1i.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Chuy\u00ean bi\u1ec7t h\u00f3a m\u1ed9t kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>K\u1ebf th\u1eeba<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>R\u00f5 r\u00e0ng <strong>l\u00e0-m\u1ed9t<\/strong>m\u1ed1i quan h\u1ec7 h\u1ee3p l\u00fd h\u00f3a c\u1ea5u tr\u00fac k\u1ebf th\u1eeba.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Thu\u1eadt to\u00e1n c\u00f3 th\u1ec3 thay th\u1ebf \u0111\u01b0\u1ee3c<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>T\u00ednh \u0111a h\u00ecnh th\u00f4ng qua giao di\u1ec7n<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Cho ph\u00e9p thu\u1eadt to\u00e1n thay \u0111\u1ed5i m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ng\u01b0\u1eddi g\u1ecdi.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>X\u00e2y d\u1ef1ng \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee9c t\u1ea1p<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Th\u00e0nh ph\u1ea7n<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p so v\u1edbi c\u00e1c c\u00e2y k\u1ebf th\u1eeba s\u00e2u.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Logic x\u00e1c th\u1ef1c chung<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>L\u1edbp c\u01a1 s\u1edf tr\u1eebu t\u01b0\u1ee3ng<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>Thi\u1ebft l\u1eadp c\u1ea5u tr\u00fac \u0111\u1ed3ng th\u1eddi cho ph\u00e9p c\u00e1c quy t\u1eafc x\u00e1c th\u1ef1c c\u1ee5 th\u1ec3.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>L\u1eadp k\u1ebf ho\u1ea1ch chi\u1ebfn l\u01b0\u1ee3c cho thi\u1ebft k\u1ebf \ud83d\udee0\ufe0f<\/h2>\n<p>Tr\u01b0\u1edbc khi vi\u1ebft m\u00e3, h\u00e3y l\u00ean k\u1ebf ho\u1ea1ch c\u1ea5u tr\u00fac. Vi\u1ec7c tr\u1ef1c quan h\u00f3a th\u1ee9 b\u1eadc gi\u00fap ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c v\u1ea5n \u0111\u1ec1 ti\u1ec1m \u1ea9n. S\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp.<\/p>\n<h3>Quy tr\u00ecnh thi\u1ebft k\u1ebf t\u1eebng b\u01b0\u1edbc<\/h3>\n<ul>\n<li>\n<p><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3 c\u1ed1t l\u00f5i:<\/strong> Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh trong l\u0129nh v\u1ef1c c\u1ee7a b\u1ea1n l\u00e0 g\u00ec? Li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a ch\u00fang.<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7:<\/strong> C\u00f3 th\u1ef1c th\u1ec3 n\u00e0o chia s\u1ebb h\u00e0nh vi chung kh\u00f4ng? C\u00f3 th\u1ef1c th\u1ec3 n\u00e0o \u0111\u1ea1i di\u1ec7n cho phi\u00ean b\u1ea3n chuy\u00ean bi\u1ec7t c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c kh\u00f4ng?<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c \u0111\u1ecbnh giao di\u1ec7n:<\/strong> Nh\u1eefng h\u1ee3p \u0111\u1ed3ng n\u00e0o m\u00e0 c\u00e1c th\u1ef1c th\u1ec3 n\u00e0y ph\u1ea3i th\u1ef1c hi\u1ec7n? X\u00e1c \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00e1i c\u1ea5u tr\u00fac logic l\u1eb7p l\u1ea1i:<\/strong> Di chuy\u1ec3n m\u00e3 chung v\u00e0o c\u00e1c l\u1edbp cha ho\u1eb7c c\u00e1c m\u00f4-\u0111un ti\u1ec7n \u00edch.<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c minh t\u00ednh thay th\u1ebf \u0111\u01b0\u1ee3c:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea5t k\u1ef3 l\u1edbp con n\u00e0o c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay th\u1ebf cho l\u1edbp cha m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng ch\u1ee9c n\u0103ng.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c t\u00ecnh hu\u1ed1ng \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf \ud83d\udca1<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 t\u00e1c \u0111\u1ed9ng c\u1ee7a nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y, h\u00e3y xem x\u00e9t c\u00e1ch ch\u00fang \u00e1p d\u1ee5ng v\u00e0o c\u00e1c th\u00e1ch th\u1ee9c ki\u1ebfn tr\u00fac c\u1ee5 th\u1ec3.<\/p>\n<h3>Ki\u1ebfn tr\u00fac d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n<\/h3>\n<p>Trong c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n, c\u00e1c lo\u1ea1i s\u1ef1 ki\u1ec7n kh\u00e1c nhau s\u1ebd k\u00edch ho\u1ea1t c\u00e1c b\u1ed9 x\u1eed l\u00fd kh\u00e1c nhau. T\u00ednh \u0111a h\u00ecnh cho ph\u00e9p m\u1ed9t b\u1ed9 ph\u00e2n ph\u1ed1i trung t\u00e2m x\u1eed l\u00fd m\u1ecdi s\u1ef1 ki\u1ec7n m\u1ed9t c\u00e1ch \u0111\u1ed3ng nh\u1ea5t. B\u1ed9 ph\u00e2n ph\u1ed1i s\u1ebd g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c <code>handle()<\/code> tr\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ef1 ki\u1ec7n. M\u1ed7i lo\u1ea1i s\u1ef1 ki\u1ec7n c\u1ee5 th\u1ec3 s\u1ebd tri\u1ec3n khai ph\u01b0\u01a1ng th\u1ee9c n\u00e0y \u0111\u1ec3 th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y gi\u00fap logic c\u1ee7a b\u1ed9 ph\u00e2n ph\u1ed1i lu\u00f4n s\u1ea1ch s\u1ebd v\u00e0 cho ph\u00e9p th\u00eam lo\u1ea1i s\u1ef1 ki\u1ec7n m\u1edbi m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i b\u1ed9 ph\u00e2n ph\u1ed1i.<\/p>\n<h3>H\u1ec7 th\u1ed1ng plugin<\/h3>\n<p>Nhi\u1ec1u \u1ee9ng d\u1ee5ng h\u1ed7 tr\u1ee3 plugin \u0111\u1ec3 m\u1edf r\u1ed9ng ch\u1ee9c n\u0103ng. \u1ee8ng d\u1ee5ng c\u1ed1t l\u00f5i \u0111\u1ecbnh ngh\u0129a m\u1ed9t giao di\u1ec7n chu\u1ea9n cho plugin. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n plugin t\u1ea1o ra c\u00e1c l\u1edbp tri\u1ec3n khai giao di\u1ec7n n\u00e0y. \u1ee8ng d\u1ee5ng s\u1ebd qu\u00e9t t\u00ecm c\u00e1c plugin n\u00e0y v\u00e0 t\u1ea3i ch\u00fang \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t h\u1ec7 sinh th\u00e1i module, n\u01a1i ch\u1ee9c n\u0103ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00f4 h\u1ea1n m\u00e0 kh\u00f4ng c\u1ea7n s\u1eeda \u0111\u1ed5i m\u00e3 ngu\u1ed3n c\u1ed1t l\u00f5i c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n<h3>M\u1eabu chi\u1ebfn l\u01b0\u1ee3c<\/h3>\n<p>Khi m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ea7n ch\u1ecdn t\u1eeb nhi\u1ec1u thu\u1eadt to\u00e1n, m\u1eabu chi\u1ebfn l\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111a h\u00ecnh \u0111\u1ec3 \u0111\u00f3ng g\u00f3i m\u1ed7i thu\u1eadt to\u00e1n v\u00e0o m\u1ed9t l\u1edbp ri\u00eang bi\u1ec7t. \u0110\u1ed1i t\u01b0\u1ee3ng ng\u1eef c\u1ea3nh gi\u1eef tham chi\u1ebfu \u0111\u1ebfn giao di\u1ec7n chi\u1ebfn l\u01b0\u1ee3c. T\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y, ng\u1eef c\u1ea3nh c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i gi\u1eefa c\u00e1c chi\u1ebfn l\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p h\u00e0nh vi thay \u0111\u1ed5i \u0111\u1ed9c l\u1eadp v\u1edbi tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n<h2>Duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng m\u00e3 ngu\u1ed3n theo th\u1eddi gian \ud83d\udd04<\/h2>\n<p>Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, ch\u1ea5t l\u01b0\u1ee3ng m\u00e3 ngu\u1ed3n ph\u1ea3i \u0111\u01b0\u1ee3c duy tr\u00ec. Vi\u1ec7c refactoring \u0111\u1ecbnh k\u1ef3 l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u1ea5u tr\u00fac k\u1ebf th\u1eeba tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p. C\u00e1c cu\u1ed9c ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 n\u00ean ki\u1ec3m tra xem c\u00f3 l\u1edbp n\u00e0o tr\u1edf n\u00ean qu\u00e1 chuy\u00ean bi\u1ec7t hay c\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng n\u00e0o tr\u1edf n\u00ean qu\u00e1 m\u01a1 h\u1ed3 hay kh\u00f4ng.<\/p>\n<h3>Danh s\u00e1ch ki\u1ec3m tra refactoring<\/h3>\n<ul>\n<li>\n<p>C\u00f3 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o trong l\u1edbp cha ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ed9t l\u1edbp con duy nh\u1ea5t kh\u00f4ng?<\/p>\n<\/li>\n<li>\n<p>C\u00f3 ph\u01b0\u01a1ng th\u1ee9c n\u00e0o trong l\u1edbp con kh\u00f4ng t\u1ed3n t\u1ea1i trong l\u1edbp cha kh\u00f4ng?<\/p>\n<\/li>\n<li>\n<p>C\u00f3 th\u1ec3 l\u00e0m ph\u1eb3ng m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u th\u00e0nh m\u1ed9t c\u1ea5u tr\u00fac \u0111\u01a1n gi\u1ea3n h\u01a1n kh\u00f4ng?<\/p>\n<\/li>\n<li>\n<p>Li\u1ec7u quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean c\u00f3 r\u00f5 r\u00e0ng v\u1ec1 m\u1ed1i quan h\u1ec7 k\u1ebf th\u1eeba kh\u00f4ng?<\/p>\n<\/li>\n<li>\n<p>C\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp cha \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ed1i thi\u1ec3u h\u00f3a ch\u01b0a?<\/p>\n<\/li>\n<\/ul>\n<h2>T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn ki\u1ec3m th\u1eed v\u00e0 g\u1ee1 l\u1ed7i \ud83e\uddea<\/h2>\n<p>M\u1ed9t c\u1ea5u tr\u00fac k\u1ebf th\u1eeba v\u00e0 \u0111a h\u00ecnh \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t s\u1ebd c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 kh\u1ea3 n\u0103ng ki\u1ec3m th\u1eed. Vi\u1ec7c m\u00f4 ph\u1ecfng tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n khi l\u00e0m vi\u1ec7c v\u1edbi giao di\u1ec7n. B\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t tri\u1ec3n khai gi\u1ea3 l\u1eadp c\u1ee7a l\u1edbp cha \u0111\u1ec3 ki\u1ec3m th\u1eed l\u1edbp con m\u00e0 kh\u00f4ng c\u1ea7n m\u00f4i tr\u01b0\u1eddng \u0111\u1ea7y \u0111\u1ee7.<\/p>\n<ul>\n<li>\n<p><strong>Ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb:<\/strong>Ki\u1ec3m th\u1eed c\u00e1c l\u1edbp con m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp b\u1eb1ng c\u00e1ch m\u00f4 ph\u1ecfng c\u00e1c ph\u1ee5 thu\u1ed9c t\u1eeb l\u1edbp cha.<\/p>\n<\/li>\n<li>\n<p><strong>Ki\u1ec3m th\u1eed t\u00edch h\u1ee3p:<\/strong>X\u00e1c minh r\u1eb1ng c\u00e1c l\u1eddi g\u1ecdi \u0111a h\u00ecnh ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang \u0111\u1eafn tr\u00ean to\u00e0n h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ki\u1ec3m th\u1eed h\u1ed3i quy:<\/strong>S\u1ef1 thay \u0111\u1ed5i trong l\u1edbp con kh\u00f4ng n\u00ean \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u00e0nh vi c\u1ee7a l\u1edbp cha hay c\u00e1c l\u1edbp anh em kh\u00e1c.<\/p>\n<\/li>\n<\/ul>\n<p>S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y l\u00e0m gi\u1ea3m ph\u1ea1m vi ki\u1ec3m th\u1eed c\u1ea7n thi\u1ebft cho m\u1ed7i thay \u0111\u1ed5i. Khi th\u00eam m\u1ed9t t\u00ednh n\u0103ng m\u1edbi, b\u1ea1n ch\u1ec9 c\u1ea7n ki\u1ec3m th\u1eed l\u1edbp m\u1edbi v\u00e0 c\u00e1c t\u01b0\u01a1ng t\u00e1c tr\u1ef1c ti\u1ebfp c\u1ee7a n\u00f3. Ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng v\u1eabn \u1ed5n \u0111\u1ecbnh.<\/p>\n<h2>K\u1ebft lu\u1eadn v\u1ec1 tri\u1ebft l\u00fd thi\u1ebft k\u1ebf<\/h2>\n<p>X\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 vi\u1ebft m\u00e3 ngu\u1ed3n ho\u1ea1t \u0111\u1ed9ng; \u0111\u00f3 l\u00e0 vi\u1ebft m\u00e3 ngu\u1ed3n c\u00f3 th\u1ec3 ph\u00e1t tri\u1ec3n theo th\u1eddi gian. \u0110a h\u00ecnh v\u00e0 k\u1ebf th\u1eeba l\u00e0 nh\u1eefng c\u00f4ng c\u1ee5 gi\u00fap th\u1ef1c hi\u1ec7n s\u1ef1 ph\u00e1t tri\u1ec3n n\u00e0y. Ch\u00fang cung c\u1ea5p c\u1ea5u tr\u00fac c\u1ea7n thi\u1ebft \u0111\u1ec3 qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p, \u0111\u1ed3ng th\u1eddi v\u1eabn \u0111\u1ea3m b\u1ea3o t\u00ednh linh ho\u1ea1t c\u1ea7n thi\u1ebft cho nh\u1eefng thay \u0111\u1ed5i trong nhu c\u1ea7u kinh doanh. B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf h\u1ee3p l\u00fd v\u00e0 tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng v\u1eabn v\u1eefng ch\u1eafc v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec trong nhi\u1ec1u n\u0103m. Vi\u1ec7c \u0111\u1ea7u t\u01b0 v\u00e0o thi\u1ebft k\u1ebf ph\u00f9 h\u1ee3p s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch r\u00f5 r\u1ec7t trong vi\u1ec7c gi\u1ea3m chi ph\u00ed b\u1ea3o tr\u00ec v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n.<\/p>\n<p>T\u1eadp trung v\u00e0o c\u00e1c ph\u00e2n c\u1ea5p r\u00f5 r\u00e0ng, giao di\u1ec7n nh\u1ea5t qu\u00e1n v\u00e0 s\u1ef1\u8026 k\u1ebft l\u1ecfng l\u1ebbo. Xem k\u1ebf th\u1eeba nh\u01b0 m\u1ed9t c\u00f4ng c\u1ee5 \u0111\u1ec3 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a v\u00e0 \u0111a h\u00ecnh nh\u01b0 m\u1ed9t c\u00f4ng c\u1ee5 \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c. V\u1edbi nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng, ki\u1ebfn tr\u00fac c\u1ee7a b\u1ea1n s\u1ebd s\u1eb5n s\u00e0ng cho nh\u1eefng y\u00eau c\u1ea7u trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m, ki\u1ebfn tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u1eddng quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 b\u1ec1n c\u1ee7a n\u00f3. Khi c\u00e1c \u1ee9ng d\u1ee5ng ng\u00e0y c\u00e0ng ph\u1ee9c t\u1ea1p, m\u00e3 ngu\u1ed3n&hellip;<\/p>\n","protected":false},"author":1,"featured_media":850,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"X\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng: H\u01b0\u1edbng d\u1eabn v\u1ec1 \u0111a h\u00ecnh v\u00e0 k\u1ebf th\u1eeba","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch \u0111a h\u00ecnh v\u00e0 k\u1ebf th\u1eeba th\u00fac \u0111\u1ea9y ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. 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