{"id":118,"date":"2026-04-06T18:42:32","date_gmt":"2026-04-06T18:42:32","guid":{"rendered":"https:\/\/www.hi-posts.com\/vn\/object-oriented-analysis-design-quick-start-class-diagram\/"},"modified":"2026-04-06T18:42:32","modified_gmt":"2026-04-06T18:42:32","slug":"object-oriented-analysis-design-quick-start-class-diagram","status":"publish","type":"post","link":"https:\/\/www.hi-posts.com\/vn\/object-oriented-analysis-design-quick-start-class-diagram\/","title":{"rendered":"B\u1eaft \u0111\u1ea7u nhanh ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng: T\u1eeb \u00fd t\u01b0\u1edfng \u0111\u1ebfn s\u01a1 \u0111\u1ed3 l\u1edbp trong m\u1ed9t ng\u00e0y"},"content":{"rendered":"<p>Ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t \u00fd t\u01b0\u1edfng m\u01a1 h\u1ed3 ho\u1eb7c nhu c\u1ea7u kinh doanh c\u1ee5 th\u1ec3. \u0110\u1ec3 chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng n\u00e0y th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng, c\u00e1c k\u1ef9 s\u01b0 d\u1ef1a v\u00e0o c\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 c\u1ea5u tr\u00fac. Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOAD) l\u00e0 m\u1ed9t trong nh\u1eefng khung n\u1ec1n t\u1ea3ng m\u1ea1nh m\u1ebd nh\u1ea5t cho qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i n\u00e0y. N\u00f3 chuy\u1ec3n tr\u1ecdng t\u00e2m t\u1eeb logic theo tr\u00ecnh t\u1ef1 sang t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, ph\u1ea3n \u00e1nh c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 h\u00e0nh vi trong th\u1ebf gi\u1edbi th\u1ef1c. H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p m\u1ed9t h\u00e0nh tr\u00ecnh c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 chuy\u1ec3n t\u1eeb c\u00e1c \u00fd t\u01b0\u1edfng ban \u0111\u1ea7u \u0111\u1ebfn s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee5 th\u1ec3 trong v\u00f2ng m\u1ed9t ng\u00e0y.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Charcoal sketch infographic illustrating the 5-phase Object-Oriented Analysis and Design workflow: conceptualization with actors\/use cases, domain modeling extracting nouns and verbs, relationship design showing UML symbols for association\/aggregation\/composition\/inheritance, class diagram structure with three compartments and visibility modifiers (+\/-\/#\/~), multiplicity notations (1, 0..1, *), and a one-day timeline from 09:00 requirements gathering to 18:00 validation, plus key principles of encapsulation and abstraction with a final design checklist\" decoding=\"async\" src=\"https:\/\/www.hi-posts.com\/wp-content\/uploads\/2026\/04\/ooad-quickstart-infographic-charcoal-sketch.jpg\"\/><\/figure>\n<\/div>\n<h2>Hi\u1ec3u r\u00f5 tri\u1ebft l\u00fd c\u1ed1t l\u00f5i \ud83e\udde0<\/h2>\n<p>Tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o c\u00e1c thao t\u00e1c v\u1ebd s\u01a1 \u0111\u1ed3, \u0111i\u1ec1u thi\u1ebft y\u1ebfu l\u00e0 ph\u1ea3i n\u1eafm v\u1eefng tri\u1ebft l\u00fd n\u1ec1n t\u1ea3ng c\u1ee7a t\u01b0 duy h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Kh\u00e1c v\u1edbi l\u1eadp tr\u00ecnh th\u1ee7 t\u1ee5c, t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n quanh c\u00e1c h\u00e0nh \u0111\u1ed9ng v\u00e0 h\u00e0m, thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n quanh d\u1eef li\u1ec7u v\u00e0 c\u00e1c thao t\u00e1c thao t\u00e1c v\u1edbi d\u1eef li\u1ec7u \u0111\u00f3. Trong OOAD, &#8216;\u0111\u1ed1i t\u01b0\u1ee3ng&#8217; l\u00e0 kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n nh\u1ea5t.<\/p>\n<p>M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng bao g\u1ed3m hai th\u00e0nh ph\u1ea7n ch\u00ednh:<\/p>\n<ul>\n<li><strong>Tr\u1ea1ng th\u00e1i:<\/strong> D\u1eef li\u1ec7u ho\u1eb7c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ea1i b\u1ea5t k\u1ef3 th\u1eddi \u0111i\u1ec3m n\u00e0o.<\/li>\n<li><strong>H\u00e0nh vi:<\/strong> C\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c thao t\u00e1c m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n.<\/li>\n<\/ul>\n<p>Khi b\u1ea1n ph\u00e2n t\u00edch m\u1ed9t h\u1ec7 th\u1ed1ng b\u1eb1ng OOAD, b\u1ea1n th\u1ef1c ch\u1ea5t \u0111ang x\u00e1c \u0111\u1ecbnh c\u00e1c danh t\u1eeb (\u0111\u1ed1i t\u01b0\u1ee3ng) v\u00e0 \u0111\u1ed9ng t\u1eeb (h\u00e0nh vi) trong l\u0129nh v\u1ef1c v\u1ea5n \u0111\u1ec1. C\u00e1ch ti\u1ebfp c\u1eadn ng\u00f4n ng\u1eef n\u00e0y l\u00e0m \u0111\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 tr\u00ecnh tr\u1eebu t\u01b0\u1ee3ng h\u00f3a. Thay v\u00ec h\u1ecfi &#8216;ch\u01b0\u01a1ng tr\u00ecnh n\u00ean l\u00e0m g\u00ec?&#8217;, b\u1ea1n s\u1ebd h\u1ecfi &#8216;nh\u1eefng g\u00ec tham gia v\u00e0o, v\u00e0 ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o?&#8217;<\/p>\n<p>C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch:<\/p>\n<ul>\n<li><strong>T\u00ednh module:<\/strong>C\u00e1c th\u00e0nh ph\u1ea7n l\u00e0 \u0111\u1ed9c l\u1eadp v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n ri\u00eang bi\u1ec7t.<\/li>\n<li><strong>T\u00ednh t\u00e1i s\u1eed d\u1ee5ng:<\/strong>C\u00e1c l\u1edbp c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u1ebf th\u1eeba v\u00e0 t\u00e1i s\u1eed d\u1ee5ng \u1edf c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<li><strong>T\u00ednh d\u1ec5 b\u1ea3o tr\u00ec:<\/strong>S\u1ef1 thay \u0111\u1ed5i \u1edf m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng nh\u1ea5t thi\u1ebft \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c, mi\u1ec5n l\u00e0 giao di\u1ec7n v\u1eabn \u1ed5n \u0111\u1ecbnh.<\/li>\n<\/ul>\n<h2>Giai \u0111o\u1ea1n 1: Kh\u00e1i ni\u1ec7m h\u00f3a v\u00e0 y\u00eau c\u1ea7u \ud83d\udccb<\/h2>\n<p>Ng\u00e0y \u0111\u1ea7u ti\u00ean b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c thu th\u1eadp th\u00f4ng tin. B\u1ea1n kh\u00f4ng th\u1ec3 thi\u1ebft k\u1ebf gi\u1ea3i ph\u00e1p n\u1ebfu kh\u00f4ng hi\u1ec3u r\u00f5 v\u1ea5n \u0111\u1ec1. Giai \u0111o\u1ea1n n\u00e0y t\u1eadp trung v\u00e0o vi\u1ec7c hi\u1ec3u r\u00f5 ph\u1ea1m vi v\u00e0 c\u00e1c t\u00e1c nh\u00e2n tham gia.<\/p>\n<h3>X\u00e1c \u0111\u1ecbnh c\u00e1c t\u00e1c nh\u00e2n<\/h3>\n<p>M\u1ed9t t\u00e1c nh\u00e2n l\u00e0 b\u1ea5t k\u1ef3 ai ho\u1eb7c b\u1ea5t k\u1ef3 th\u1ee9 g\u00ec t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ec7 th\u1ed1ng. C\u00e1c t\u00e1c nh\u00e2n c\u00f3 th\u1ec3 l\u00e0 ng\u01b0\u1eddi d\u00f9ng, h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i ho\u1eb7c thi\u1ebft b\u1ecb ph\u1ea7n c\u1ee9ng. Li\u1ec7t k\u00ea ch\u00fang gi\u00fap x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<ul>\n<li><strong>T\u00e1c nh\u00e2n ch\u00ednh:<\/strong>Ng\u01b0\u1eddi d\u00f9ng kh\u1edfi t\u1ea1o c\u00e1c t\u01b0\u01a1ng t\u00e1c \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau (v\u00ed d\u1ee5: Kh\u00e1ch h\u00e0ng, Qu\u1ea3n tr\u1ecb vi\u00ean).<\/li>\n<li><strong>T\u00e1c nh\u00e2n ph\u1ee5:<\/strong>C\u00e1c h\u1ec7 th\u1ed1ng h\u1ed7 tr\u1ee3 t\u00e1c nh\u00e2n ch\u00ednh nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 tr\u1ecdng t\u00e2m ch\u00ednh (v\u00ed d\u1ee5: C\u1ed5ng thanh to\u00e1n, M\u00e1y ch\u1ee7 email).<\/li>\n<\/ul>\n<h3>X\u00e1c \u0111\u1ecbnh c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/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 t\u00e1c nh\u00e2n v\u00e0 h\u1ec7 th\u1ed1ng nh\u1eb1m \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: &#8216;T\u00e1c nh\u00e2n c\u00f3 th\u1ec3 l\u00e0m g\u00ec?&#8217;<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> &#8216;\u0110\u1eb7t h\u00e0ng&#8217; l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng cho &#8216;Kh\u00e1ch h\u00e0ng&#8217;.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> \u201cX\u1eed l\u00fd thanh to\u00e1n\u201d l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng cho m\u1ed9t \u201cD\u1ecbch v\u1ee5 Thanh to\u00e1n\u201d.<\/li>\n<\/ul>\n<p>Trong giai \u0111o\u1ea1n n\u00e0y, h\u00e3y tr\u00e1nh c\u00e1c chi ti\u1ebft k\u1ef9 thu\u1eadt. T\u1eadp trung v\u00e0o ch\u1ee9c n\u0103ng. Ghi l\u1ea1i m\u1ecdi t\u01b0\u01a1ng t\u00e1c ri\u00eang bi\u1ec7t m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 t\u01b0\u1edfng t\u01b0\u1ee3ng ra. \u0110\u1eebng lo l\u1eafng v\u1ec1 c\u00e1ch h\u1ec7 th\u1ed1ng s\u1ebd th\u1ef1c hi\u1ec7n c\u00e1c ch\u1ee9c n\u0103ng n\u00e0y ngay b\u00e2y gi\u1edd; ch\u1ec9 c\u1ea7n ghi ch\u00e9p l\u1ea1i r\u1eb1ng ch\u00fang ph\u1ea3i x\u1ea3y ra.<\/p>\n<h2>Giai \u0111o\u1ea1n 2: Ph\u00e2n t\u00edch v\u00e0 m\u00f4 h\u00ecnh h\u00f3a mi\u1ec1n \ud83c\udfd7\ufe0f<\/h2>\n<p>Khi c\u00e1c y\u00eau c\u1ea7u tr\u1edf n\u00ean r\u00f5 r\u00e0ng, tr\u1ecdng t\u00e2m chuy\u1ec3n sang mi\u1ec1n. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c kh\u00e1i ni\u1ec7m t\u1ed3n t\u1ea1i trong b\u1ed1i c\u1ea3nh kinh doanh. B\u01b0\u1edbc n\u00e0y gi\u00fap l\u1ea5p \u0111\u1ea7y kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c y\u00eau c\u1ea7u kinh doanh v\u00e0 tri\u1ec3n khai k\u1ef9 thu\u1eadt.<\/p>\n<h3>Tr\u00edch xu\u1ea5t Danh t\u1eeb v\u00e0 \u0110\u1ed9ng t\u1eeb<\/h3>\n<p>Xem l\u1ea1i m\u00f4 t\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee7a b\u1ea1n v\u00e0 l\u00e0m n\u1ed5i b\u1eadt c\u00e1c danh t\u1eeb v\u00e0 \u0111\u1ed9ng t\u1eeb. \u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng m\u1ea7m m\u1ed1ng c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n.<\/p>\n<ul>\n<li><strong>Danh t\u1eeb:<\/strong> Ch\u00fang th\u01b0\u1eddng \u00e1nh x\u1ea1 \u0111\u1ebfn C\u00e1c l\u1edbp. (v\u00ed d\u1ee5: \u0110\u01a1n h\u00e0ng, S\u1ea3n ph\u1ea9m, Kh\u00e1ch h\u00e0ng, H\u00f3a \u0111\u01a1n).<\/li>\n<li><strong>\u0110\u1ed9ng t\u1eeb:<\/strong> Ch\u00fang th\u01b0\u1eddng \u00e1nh x\u1ea1 \u0111\u1ebfn C\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c Li\u00ean k\u1ebft. (v\u00ed d\u1ee5: T\u1ea1o, X\u00f3a, C\u1eadp nh\u1eadt, G\u1eedi).<\/li>\n<\/ul>\n<h3>Ph\u00e2n bi\u1ec7t c\u00e1c th\u1ef1c th\u1ec3<\/h3>\n<p>Kh\u00f4ng ph\u1ea3i danh t\u1eeb n\u00e0o c\u0169ng \u0111\u1ea1i di\u1ec7n cho m\u1ed9t l\u1edbp. M\u1ed9t s\u1ed1 danh t\u1eeb \u0111\u1ea1i di\u1ec7n cho thu\u1ed9c t\u00ednh. \u0110\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa L\u1edbp v\u00e0 Thu\u1ed9c t\u00ednh, h\u00e3y \u0111\u1eb7t c\u00e2u h\u1ecfi: \u201cDanh t\u1eeb n\u00e0y c\u00f3 b\u1ea3n th\u00e2n n\u00f3 m\u1ed9t danh t\u00ednh v\u00e0 tr\u1ea1ng th\u00e1i ri\u00eang kh\u00f4ng?\u201d.<\/p>\n<ul>\n<li><strong>L\u1edbp:<\/strong> \u201cKh\u00e1ch h\u00e0ng\u201d c\u00f3 t\u00ean, \u0111\u1ecba ch\u1ec9 v\u00e0 l\u1ecbch s\u1eed. N\u00f3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh:<\/strong> \u201cT\u00ean\u201d l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh c\u1ee7a Kh\u00e1ch h\u00e0ng. N\u00f3 kh\u00f4ng t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/li>\n<\/ul>\n<h2>Giai \u0111o\u1ea1n 3: Thi\u1ebft k\u1ebf c\u00e1c m\u1ed1i quan h\u1ec7 \ud83d\udd17<\/h2>\n<p>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. Ch\u00fang li\u00ean k\u1ebft v\u1edbi nhau. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf ch\u1ee9c n\u0103ng. C\u00f3 b\u1ed1n lo\u1ea1i m\u1ed1i quan h\u1ec7 ch\u00ednh m\u00e0 b\u1ea1n c\u1ea7n hi\u1ec3u r\u00f5.<\/p>\n<h3>1. Li\u00ean k\u1ebft<\/h3>\n<p>M\u1ed9t li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed9t m\u1ed1i li\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 cho th\u1ea5y c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp kh\u00e1c.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t Kh\u00e1ch h\u00e0ng <em> s\u1edf h\u1eefu<\/em> m\u1ed9t \u0110\u01a1n h\u00e0ng.<\/li>\n<li><strong>H\u01b0\u1edbng:<\/strong> C\u00f3 th\u1ec3 l\u00e0 m\u1ed9t chi\u1ec1u (Kh\u00e1ch h\u00e0ng bi\u1ebft \u0111\u1ebfn \u0110\u01a1n h\u00e0ng) ho\u1eb7c hai chi\u1ec1u (\u0110\u01a1n h\u00e0ng bi\u1ebft \u0111\u1ebfn Kh\u00e1ch h\u00e0ng).<\/li>\n<\/ul>\n<h3>2. T\u00edch h\u1ee3p<\/h3>\n<p>T\u00edch h\u1ee3p l\u00e0 m\u1ed9t lo\u1ea1i li\u00ean k\u1ebft c\u1ee5 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 \u201cto\u00e0n th\u1ec3-ph\u1ea7n\u201d. C\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t Ph\u00f2ng ban <em>c\u00f3<\/em>Nh\u00e2n vi\u00ean. N\u1ebfu ph\u00f2ng ban b\u1ecb gi\u1ea3i th\u1ec3, nh\u00e2n vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i.<\/li>\n<li><strong>K\u00fd hi\u1ec7u:<\/strong>Th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh kim c\u01b0\u01a1ng r\u1ed7ng \u1edf ph\u00eda &#8220;to\u00e0n b\u1ed9&#8221;.<\/li>\n<\/ul>\n<h3>3. K\u1ebft h\u1ee3p<\/h3>\n<p>K\u1ebft h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a t\u1ed5ng h\u1ee3p. C\u00e1c b\u1ed9 ph\u1eadn kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c b\u1ed9 ph\u1eadn c\u0169ng b\u1ecb ph\u00e1 h\u1ee7y.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t ng\u00f4i nh\u00e0 <em>c\u00f3<\/em>Ph\u00f2ng. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i.<\/li>\n<li><strong>K\u00fd hi\u1ec7u:<\/strong>H\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y \u1edf ph\u00eda &#8220;to\u00e0n b\u1ed9&#8221;.<\/li>\n<\/ul>\n<h3>4. K\u1ebf th\u1eeba (T\u1ed5ng qu\u00e1t h\u00f3a)<\/h3>\n<p>K\u1ebf th\u1eeba cho ph\u00e9p m\u1ed9t l\u1edbp ti\u1ebfp nh\u1eadn c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi c\u1ee7a m\u1ed9t l\u1edbp kh\u00e1c. \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\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t &#8220;T\u00e0i kho\u1ea3n ti\u1ebft ki\u1ec7m&#8221; l\u00e0 m\u1ed9t lo\u1ea1i &#8220;T\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng&#8221;.<\/li>\n<li><strong>K\u00fd hi\u1ec7u:<\/strong>\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi tam gi\u00e1c r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha.<\/li>\n<\/ul>\n<h2>Giai \u0111o\u1ea1n 4: T\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp \ud83d\udcd0<\/h2>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n. N\u00f3 minh h\u1ecda c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang. \u0110\u00e2y l\u00e0 k\u1ebft qu\u1ea3 c\u1ee5 th\u1ec3 c\u1ee7a qu\u00e1 tr\u00ecnh OOAD c\u1ee7a b\u1ea1n.<\/p>\n<h3>C\u1ea5u tr\u00fac l\u1edbp<\/h3>\n<p>M\u1ed7i l\u1edbp trong s\u01a1 \u0111\u1ed3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c chia th\u00e0nh ba ng\u0103n:<\/p>\n<ul>\n<li><strong>T\u00ean:<\/strong>\u0110\u1ecbnh danh cho l\u1edbp (v\u00ed d\u1ee5,<code>Kh\u00e1ch h\u00e0ng<\/code>).<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh:<\/strong>C\u00e1c th\u00e0nh vi\u00ean d\u1eef li\u1ec7u (v\u00ed d\u1ee5,<code>customerID: S\u1ed1 nguy\u00ean<\/code>, <code>t\u00ean: Chu\u1ed7i<\/code>).<\/li>\n<li><strong>Ph\u01b0\u01a1ng th\u1ee9c:<\/strong> C\u00e1c h\u00e0nh vi (v\u00ed d\u1ee5 nh\u01b0 <code>getBalance(): S\u1ed1 th\u1ef1c<\/code>, <code>deposit(s\u1ed1 ti\u1ec1n: S\u1ed1 th\u1ef1c)<\/code>).<\/li>\n<\/ul>\n<h3>C\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng<\/h3>\n<p>Ki\u1ec3m so\u00e1t quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c th\u00e0nh vi\u00ean l\u1edbp b\u1eb1ng c\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi t\u00ednh \u0111\u00f3ng g\u00f3i.<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>B\u1ed9 s\u1eeda \u0111\u1ed5i<\/th>\n<th>T\u00ednh kh\u1ea3 d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>+<\/code><\/td>\n<td>C\u00f4ng khai<\/td>\n<td>C\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u.<\/td>\n<\/tr>\n<tr>\n<td><code>-<\/code><\/td>\n<td>Ri\u00eang t\u01b0<\/td>\n<td>Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u00ean trong l\u1edbp.<\/td>\n<\/tr>\n<tr>\n<td><code>#<\/code><\/td>\n<td>B\u1ea3o v\u1ec7<\/td>\n<td>C\u00f3 th\u1ec3 truy c\u1eadp trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con c\u1ee7a n\u00f3.<\/td>\n<\/tr>\n<tr>\n<td><code>~<\/code><\/td>\n<td>G\u00f3i<\/td>\n<td>C\u00f3 th\u1ec3 truy c\u1eadp trong c\u00f9ng m\u1ed9t g\u00f3i.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>S\u1ed1 l\u01b0\u1ee3ng v\u00e0 b\u1ed9i s\u1ed1<\/h3>\n<p>C\u00e1c m\u1ed1i quan h\u1ec7 kh\u00f4ng ch\u1ec9 l\u00e0 nh\u1ecb ph\u00e2n; ch\u00fang li\u00ean quan \u0111\u1ebfn c\u00e1c l\u01b0\u1ee3ng. B\u1ed9i s\u1ed1 x\u00e1c \u0111\u1ecbnh c\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp li\u00ean quan \u0111\u1ebfn m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c.<\/p>\n<ul>\n<li><strong>1:<\/strong>Ch\u00ednh x\u00e1c m\u1ed9t.<\/li>\n<li><strong>0..1:<\/strong> Kh\u00f4ng ho\u1eb7c m\u1ed9t.<\/li>\n<li><strong>1..*:<\/strong> M\u1ed9t ho\u1eb7c nhi\u1ec1u h\u01a1n.<\/li>\n<li><strong>*:<\/strong> Kh\u00f4ng ho\u1eb7c nhi\u1ec1u h\u01a1n.<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5, m\u1ed9t <em>Kh\u00e1ch h\u00e0ng<\/em> \u0111\u1eb7t <em>1..*<\/em> \u0110\u01a1n h\u00e0ng. M\u1ed9t <em>\u0110\u01a1n h\u00e0ng<\/em> \u0111\u01b0\u1ee3c \u0111\u1eb7t b\u1edfi <em>0..1<\/em> Kh\u00e1ch h\u00e0ng (trong m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng, cho ph\u00e9p \u0111\u01a1n h\u00e0ng \u1ea9n danh). Vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c con s\u1ed1 n\u00e0y gi\u00fap ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i logic trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng.<\/p>\n<h2>B\u01b0\u1edbc 5: Tinh ch\u1ec9nh v\u00e0 X\u00e1c minh \ud83d\udee0\ufe0f<\/h2>\n<p>Sau khi v\u1ebd s\u01a1 \u0111\u1ed3 ban \u0111\u1ea7u, h\u00e3y xem x\u00e9t l\u1ea1i n\u00f3 theo y\u00eau c\u1ea7u. M\u1ed9t s\u01a1 \u0111\u1ed3 kh\u00f4ng \u0111\u01b0\u1ee3c coi l\u00e0 ho\u00e0n ch\u1ec9nh cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c x\u00e1c minh. B\u01b0\u1edbc n\u00e0y \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf ph\u00f9 h\u1ee3p v\u1edbi ch\u1ee9c n\u0103ng mong mu\u1ed1n.<\/p>\n<h3>Danh s\u00e1ch ki\u1ec3m tra x\u00e1c minh<\/h3>\n<ul>\n<li><strong>\u0110\u1ea7y \u0111\u1ee7:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u00f3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c l\u1edbp ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng?<\/li>\n<li><strong>Nh\u1ea5t qu\u00e1n:<\/strong>C\u00e1c ki\u1ec3u thu\u1ed9c t\u00ednh c\u00f3 nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c l\u1edbp li\u00ean quan kh\u00f4ng?<\/li>\n<li><strong>R\u00f5 r\u00e0ng:<\/strong>M\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 v\u00e0 hi\u1ec3u logic m\u00e0 kh\u00f4ng b\u1ecb m\u01a1 h\u1ed3 kh\u00f4ng?<\/li>\n<li><strong>Kh\u1ea3 thi:<\/strong>H\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c tri\u1ec3n khai v\u1edbi c\u00f4ng ngh\u1ec7 hi\u1ec7n t\u1ea1i kh\u00f4ng?<\/li>\n<\/ul>\n<h3>Nh\u1eefng l\u1ed7i thi\u1ebft k\u1ebf ph\u1ed5 bi\u1ebfn<\/h3>\n<p>Tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn sau trong giai \u0111o\u1ea1n n\u00e0y:<\/p>\n<ul>\n<li><strong>L\u1edbp Th\u1ea7n:<\/strong> M\u1ed9t l\u1edbp ch\u1ee9a qu\u00e1 nhi\u1ec1u logic v\u00e0 d\u1eef li\u1ec7u. Chia nh\u1ecf l\u1edbp n\u00e0y th\u00e0nh c\u00e1c l\u1edbp nh\u1ecf h\u01a1n, t\u1eadp trung v\u00e0o ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3.<\/li>\n<li><strong>M\u1ed1i quan h\u1ec7 h\u1ed7n \u0111\u1ed9n:<\/strong>Qu\u00e1 nhi\u1ec1u m\u1ed1i li\u00ean h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp t\u1ea1o ra s\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd. H\u00e3y h\u01b0\u1edbng \u0111\u1ebfn s\u1ef1 g\u1eafn k\u1ebft l\u1ecfng l\u1ebbo.<\/li>\n<li><strong>Thi\u1ebfu thu\u1ed9c t\u00ednh:<\/strong>B\u1ecf qu\u00ean c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u quan tr\u1ecdng \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong y\u00eau c\u1ea7u.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf qu\u00e1 m\u1ee9c:<\/strong>T\u1ea1o ra c\u00e1c c\u1ea5u tr\u00fac k\u1ebf th\u1eeba ph\u1ee9c t\u1ea1p tr\u01b0\u1edbc khi ch\u00fang th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft. H\u00e3y gi\u1eef \u0111\u01a1n gi\u1ea3n.<\/li>\n<\/ul>\n<h2>Kh\u00e1m ph\u00e1 s\u00e2u: Bao \u0111\u00f3ng v\u00e0 Tr\u1eebu t\u01b0\u1ee3ng \ud83d\udee1\ufe0f<\/h2>\n<p>Trong khi x\u00e2y d\u1ef1ng s\u01a1 \u0111\u1ed3 l\u1edbp, h\u00e3y lu\u00f4n ghi nh\u1edb hai nguy\u00ean t\u1eafc: Bao \u0111\u00f3ng v\u00e0 Tr\u1eebu t\u01b0\u1ee3ng.<\/p>\n<h3>Bao \u0111\u00f3ng<\/h3>\n<p>Bao \u0111\u00f3ng k\u1ebft h\u1ee3p d\u1eef li\u1ec7u v\u00e0 ph\u01b0\u01a1ng th\u1ee9c l\u1ea1i v\u1edbi nhau v\u00e0 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. Trong s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng c\u00e1ch \u0111\u00e1nh d\u1ea5u d\u1eef li\u1ec7u n\u1ed9i b\u1ed9 l\u00e0 ri\u00eang t\u01b0 v\u00e0 c\u00f4ng khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng c\u1ed9ng \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u00f3.<\/p>\n<ul>\n<li><strong>L\u1ee3i \u00edch:<\/strong>B\u1ea3o v\u1ec7 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a tr\u1ea1ng th\u00e1i \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>S\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c thi\u1ebft l\u1eadp v\u00e0 truy xu\u1ea5t khi ph\u00f9 h\u1ee3p, nh\u01b0ng h\u00e3y c\u00f4ng khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ea1i di\u1ec7n cho logic kinh doanh thay v\u00ec truy c\u1eadp d\u1eef li\u1ec7u \u0111\u01a1n thu\u1ea7n.<\/li>\n<\/ul>\n<h3>Tr\u1eebu t\u01b0\u1ee3ng<\/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 \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a h\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft \u0111\u1ebfn c\u00e1ch ho\u1ea1t \u0111\u1ed9ng b\u00ean trong.<\/p>\n<ul>\n<li><strong>L\u1ee3i \u00edch:<\/strong>Gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 t\u0103ng t\u00ednh module.<\/li>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong>X\u00e1c \u0111\u1ecbnh giao di\u1ec7n cho c\u00e1c l\u1edbp y\u00eau c\u1ea7u h\u00e0nh vi c\u1ee5 th\u1ec3. \u0110\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 l\u1edbp ph\u1ea3n \u00e1nh \u0111\u00fang c\u00e1c h\u1ee3p \u0111\u1ed3ng n\u00e0y.<\/li>\n<\/ul>\n<h2>T\u00f3m t\u1eaft quy tr\u00ecnh t\u1eebng b\u01b0\u1edbc \ud83d\udd04<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea1n ho\u00e0n th\u00e0nh qu\u00e1 tr\u00ecnh n\u00e0y trong m\u1ed9t ng\u00e0y, h\u00e3y tu\u00e2n theo quy tr\u00ecnh tu\u1ea7n t\u1ef1 sau.<\/p>\n<ol>\n<li><strong>09:00 \u2013 10:00:<\/strong>Thu th\u1eadp y\u00eau c\u1ea7u v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c t\u00e1c nh\u00e2n. (Danh s\u00e1ch tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng)<\/li>\n<li><strong>10:00 \u2013 12:00:<\/strong>Ph\u00e2n t\u00edch mi\u1ec1n. X\u00e1c \u0111\u1ecbnh danh t\u1eeb v\u00e0 \u0111\u1ed9ng t\u1eeb. (B\u1ea3n nh\u00e1p l\u1edbp)<\/li>\n<li><strong>12:00 \u2013 13:00:<\/strong>Ngh\u1ec9 tr\u01b0a v\u00e0 l\u00e0m m\u1edbi tinh th\u1ea7n.<\/li>\n<li><strong>13:00 \u2013 15:00:<\/strong>X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 v\u00e0 b\u1ed9i s\u1ed1. (B\u1ea3n \u0111\u1ed3 li\u00ean k\u1ebft)<\/li>\n<li><strong>15:00 \u2013 17:00:<\/strong> V\u1ebd s\u01a1 \u0111\u1ed3 l\u1edbp. Th\u00eam thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c. (S\u01a1 \u0111\u1ed3 cu\u1ed1i c\u00f9ng)<\/li>\n<li><strong>17:00 \u2013 18:00:<\/strong> Xem x\u00e9t v\u00e0 x\u00e1c minh theo y\u00eau c\u1ea7u. (Ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng)<\/li>\n<\/ol>\n<h2>C\u00e1c Th\u1ef1c Ti\u1ec5n T\u1ed1t Nh\u1ea5t cho Th\u00e0nh C\u00f4ng D\u00e0i H\u1ea1n \ud83d\udcc8<\/h2>\n<p>M\u1eb7c d\u00f9 h\u01b0\u1edbng d\u1eabn n\u00e0y bao g\u1ed3m kh\u1edfi \u0111\u1ea7u nhanh, nh\u01b0ng duy tr\u00ec m\u1ed9t thi\u1ebft k\u1ebf ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt li\u00ean t\u1ee5c. Tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh n\u00e0y khi b\u1ea1n chuy\u1ec3n sang giai \u0111o\u1ea1n l\u1eadp tr\u00ecnh.<\/p>\n<h3>Nguy\u00ean t\u1eafc Tr\u00e1ch nhi\u1ec7m \u0110\u01a1n Nh\u1ea5t<\/h3>\n<p>\u0110\u1ea3m b\u1ea3o m\u1ed7i l\u1edbp ch\u1ec9 c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. N\u1ebfu m\u1ed9t l\u1edbp x\u1eed l\u00fd c\u1ea3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 logic kinh doanh, th\u00ec n\u00f3 qu\u00e1 ph\u1ee9c t\u1ea1p. T\u00e1ch c\u00e1c v\u1ea5n \u0111\u1ec1 th\u00e0nh c\u00e1c l\u1edbp kh\u00e1c nhau.<\/p>\n<h3>Chia nh\u1ecf Giao di\u1ec7n<\/h3>\n<p>Kh\u00e1ch h\u00e0ng kh\u00f4ng n\u00ean b\u1ecb bu\u1ed9c ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c giao di\u1ec7n m\u00e0 h\u1ecd kh\u00f4ng s\u1eed d\u1ee5ng. Thi\u1ebft k\u1ebf c\u00e1c giao di\u1ec7n nh\u1ecf, c\u1ee5 th\u1ec3 thay v\u00ec m\u1ed9t giao di\u1ec7n l\u1edbn, \u0111\u01a1n th\u1ec3.<\/p>\n<h3>\u0110\u1ea3o ng\u01b0\u1ee3c Ph\u1ee5 thu\u1ed9c<\/h3>\n<p>Ph\u1ee5 thu\u1ed9c v\u00e0o tr\u1eebu t\u01b0\u1ee3ng, kh\u00f4ng ph\u1ea3i hi\u1ec7n th\u1ef1c. S\u01a1 \u0111\u1ed3 l\u1edbp n\u00ean th\u1ec3 hi\u1ec7n c\u00e1c m\u00f4-\u0111un c\u1ea5p cao ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c tr\u1eebu t\u01b0\u1ee3ng c\u1ea5p th\u1ea5p (giao di\u1ec7n), ch\u1ee9 kh\u00f4ng ph\u1ea3i chi ti\u1ebft tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n<h2>K\u1ebft lu\u1eadn v\u1ec1 S\u1ef1 Ti\u1ebfn H\u00f3a Thi\u1ebft K\u1ebf \ud83c\udf31<\/h2>\n<p>Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng ph\u1ea3i l\u00e0 ho\u1ea1t \u0111\u1ed9ng m\u1ed9t l\u1ea7n. \u0110\u00f3 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i. Khi y\u00eau c\u1ea7u thay \u0111\u1ed5i, s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n c\u0169ng ph\u1ea3i thay \u0111\u1ed5i theo. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac t\u1ed1t h\u00f4m nay s\u1ebd gi\u1ea3m chi ph\u00ed thay \u0111\u1ed5i v\u00e0o ng\u00e0y mai. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o c\u00e1c danh t\u1eeb r\u00f5 r\u00e0ng, c\u00e1c m\u1ed1i quan h\u1ec7 v\u1eefng ch\u1eafc v\u00e0 h\u00e0nh vi \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i, b\u1ea1n t\u1ea1o n\u1ec1n t\u1ea3ng cho ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng.<\/p>\n<p>H\u00e3y nh\u1edb, m\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 ho\u00e0n h\u1ea3o ngay l\u1eadp t\u1ee9c, m\u00e0 l\u00e0 t\u1ea1o ra m\u1ed9t c\u00f4ng c\u1ee5 giao ti\u1ebfp r\u00f5 r\u00e0ng. C\u00f4ng c\u1ee5 n\u00e0y n\u1ed1i li\u1ec1n kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c b\u00ean li\u00ean quan kinh doanh v\u00e0 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n k\u1ef9 thu\u1eadt. Khi c\u1ea3 hai b\u00ean \u0111\u1ec1u hi\u1ec3u s\u01a1 \u0111\u1ed3 l\u1edbp, vi\u1ec7c ph\u00e1t tri\u1ec3n tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 d\u1ecbch thu\u1eadt thay v\u00ec di\u1ec5n gi\u1ea3i.<\/p>\n<h2>Danh S\u00e1ch Ki\u1ec3m Tra Cu\u1ed1i C\u00f9ng cho S\u01a1 \u0110\u1ed3 C\u1ee7a B\u1ea1n \u2705<\/h2>\n<p>Tr\u01b0\u1edbc khi k\u00fd duy\u1ec7t thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n, h\u00e3y x\u00e1c minh nh\u1eefng \u0111i\u1ec1u sau:<\/p>\n<ul>\n<li><strong>L\u1edbp:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c l\u1edbp c\u1ea7n thi\u1ebft \u0111\u00e3 c\u00f3 m\u1eb7t ch\u01b0a?<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh:<\/strong>C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh v\u00e0 ch\u00ednh x\u00e1c ch\u01b0a?<\/li>\n<li><strong>Ph\u01b0\u01a1ng th\u1ee9c:<\/strong>C\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 kh\u1edbp v\u1edbi c\u00e1c \u0111\u1ed9ng t\u1eeb trong y\u00eau c\u1ea7u kh\u00f4ng?<\/li>\n<li><strong>M\u1ed1i quan h\u1ec7:<\/strong>C\u00e1c m\u1ed1i quan h\u1ec7, t\u00edch h\u1ee3p v\u00e0 k\u1ebft h\u1ee3p c\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n \u0111\u00fang ch\u01b0a?<\/li>\n<li><strong>\u0110a d\u1ea1ng:<\/strong>C\u00e1c b\u1ed9i s\u1ed1 (1, 0..1, *) c\u00f3 ch\u00ednh x\u00e1c kh\u00f4ng?<\/li>\n<li><strong>T\u00ednh kh\u1ea3 ki\u1ebfn:<\/strong>C\u00e1c th\u00e0nh vi\u00ean c\u00f4ng khai, ri\u00eang t\u01b0 v\u00e0 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u \u0111\u00fang ch\u01b0a?<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch tu\u00e2n theo c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac n\u00e0y, b\u1ea1n bi\u1ebfn nh\u1eefng kh\u00e1i ni\u1ec7m m\u01a1 h\u1ed3 th\u00e0nh m\u1ed9t thi\u1ebft k\u1ebf c\u1ee5 th\u1ec3, s\u1eb5n s\u00e0ng tri\u1ec3n khai. Thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c r\u00e8n luy\u1ec7n qua th\u1ef1c h\u00e0nh, nh\u01b0ng b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng b\u01b0\u1edbc n\u1ec1n t\u1ea3ng n\u00e0y s\u1ebd \u0111\u1ea3m b\u1ea3o m\u1ed9t h\u00e0nh tr\u00ecnh v\u1eefng ch\u1eafc h\u01b0\u1edbng t\u1edbi ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m chuy\u00ean nghi\u1ec7p.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t \u00fd t\u01b0\u1edfng m\u01a1 h\u1ed3 ho\u1eb7c nhu c\u1ea7u kinh doanh c\u1ee5 th\u1ec3. \u0110\u1ec3 chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng n\u00e0y th\u00e0nh&hellip;<\/p>\n","protected":false},"author":1,"featured_media":119,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u01b0\u1edbng D\u1eabn B\u1eaft \u0110\u1ea7u Nhanh OOAD: T\u1eeb Kh\u00e1i Ni\u1ec7m \u0111\u1ebfn S\u01a1 \u0110\u1ed3 L\u1edbp","_yoast_wpseo_metadesc":"H\u1ecdc ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng trong m\u1ed9t ng\u00e0y. 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