{"id":1512,"date":"2026-04-11T22:33:46","date_gmt":"2026-04-11T14:33:46","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/common-mistakes-avoid-creating-uml-object-diagrams\/"},"modified":"2026-04-11T22:33:46","modified_gmt":"2026-04-11T14:33:46","slug":"common-mistakes-avoid-creating-uml-object-diagrams","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/common-mistakes-avoid-creating-uml-object-diagrams\/","title":{"rendered":"Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh khi t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML"},"content":{"rendered":"<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML \u0111\u00f3ng vai tr\u00f2 l\u00e0 nh\u1eefng b\u1ee9c \u1ea3nh t\u0129nh quan tr\u1ecdng v\u1ec1 tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp, v\u1ed1n \u0111\u1ecbnh ngh\u0129a b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u00f4 t\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n th\u1ef1c t\u1ebf v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. Ch\u00fang gi\u00fap l\u00e0m r\u00f5 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i v\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau trong m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. Tuy nhi\u00ean, vi\u1ec7c t\u1ea1o ra nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c. Nh\u1eefng l\u1ed7i nh\u1ecf c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec3u l\u1ea7m nghi\u00eam tr\u1ecdng trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 nh\u1eefng sai l\u1ea7m th\u01b0\u1eddng g\u1eb7p khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1c b\u1ea5t nh\u1ea5t v\u1ec1 c\u1ea5u tr\u00fac, l\u1ed7i v\u1ec1 m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c quy t\u1eafc \u0111\u1eb7t t\u00ean. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a m\u00ecnh lu\u00f4n ch\u00ednh x\u00e1c, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 h\u1eefu \u00edch cho c\u00e1c b\u00ean li\u00ean quan. H\u00e3y c\u00f9ng \u0111i s\u00e2u v\u00e0o chi ti\u1ebft v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a th\u1ec3 hi\u1ec7n UML.<\/p>\n<figure class=\"wp-block-image aligncenter\"><img alt=\"Hand-drawn infographic illustrating 9 common mistakes to avoid when creating UML Object Diagrams: confusing class\/object notation, ignoring multiplicity constraints, inconsistent attribute values, overcomplicating scope, misrepresenting associations\/aggregations, neglecting navigation paths, inconsistent naming conventions, ignoring inheritance, and failing to update diagrams. Includes visual examples, correct vs incorrect comparisons, and a best practices checklist for accurate instance modeling in software design.\" decoding=\"async\" src=\"https:\/\/mayaharper.showcasingme.net\/wp-content\/uploads\/2026\/04\/uml-object-diagram-mistakes-infographic-handdrawn.jpg\"\/><\/figure>\n<h2>Hi\u1ec3u r\u00f5 m\u1ee5c \u0111\u00edch c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udcd0<\/h2>\n<p>Tr\u01b0\u1edbc khi x\u00e1c \u0111\u1ecbnh c\u00e1c sai l\u1ea7m, \u0111i\u1ec1u thi\u1ebft y\u1ebfu l\u00e0 ph\u1ea3i \u0111\u1ecbnh ngh\u0129a r\u00f5 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea1i di\u1ec7n cho \u0111i\u1ec1u g\u00ec. \u0110\u00f3 l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh t\u0129nh v\u1ec1 tr\u1ea1ng th\u00e1i h\u1ec7 th\u1ed1ng. N\u00f3 th\u1ec3 hi\u1ec7n:<\/p>\n<ul>\n<li>C\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp (\u0111\u1ed1i t\u01b0\u1ee3ng).<\/li>\n<li>C\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n (m\u1ed1i li\u00ean k\u1ebft).<\/li>\n<li>Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh cho c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3.<\/li>\n<li>C\u00e1c r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1 \u00e1p d\u1ee5ng cho nh\u1eefng th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 \u0111\u00f3.<\/li>\n<\/ul>\n<p>Khi m\u1ee5c \u0111\u00edch tr\u1edf n\u00ean m\u1edd nh\u1ea1t, s\u01a1 \u0111\u1ed3 s\u1ebd m\u1ea5t gi\u00e1 tr\u1ecb. Nhi\u1ec1u l\u1ed7i xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c nh\u1ea7m l\u1eabn c\u1ea5u tr\u00fac t\u0129nh (s\u01a1 \u0111\u1ed3 l\u1edbp) v\u1edbi tr\u1ea1ng th\u00e1i \u0111\u1ed9ng (s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng). Vi\u1ec7c gi\u1eef r\u00f5 s\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n<h2>Sai l\u1ea7m 1: Nh\u1ea7m l\u1eabn k\u00fd hi\u1ec7u l\u1edbp v\u00e0 k\u00fd hi\u1ec7u \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udd04<\/h2>\n<p>M\u1ed9t trong nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 tr\u1ed9n l\u1eabn c\u00e1c k\u00fd hi\u1ec7u. S\u01a1 \u0111\u1ed3 l\u1edbp s\u1eed d\u1ee5ng ti\u00eau \u0111\u1ec1 in \u0111\u1eadm cho t\u00ean l\u1edbp v\u00e0 li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u.<\/p>\n<h3>L\u1ed7i sai<\/h3>\n<p>S\u1eed d\u1ee5ng t\u00ean l\u1edbp duy nh\u1ea5t cho h\u1ed9p th\u1ec3 hi\u1ec7n. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, m\u1ed9t th\u1ec3 hi\u1ec7n n\u00ean \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo \u0111\u1ecbnh d\u1ea1ng<code>t\u00eanTh\u1ec3Hi\u1ec7n : T\u00eanL\u1edbp<\/code>.<\/p>\n<h3>H\u1eadu qu\u1ea3<\/h3>\n<p>N\u1ebfu b\u1ea1n \u0111\u00e1nh nh\u00e3n m\u1ed9t h\u1ed9p ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0<code>Kh\u00e1ch h\u00e0ng<\/code>, n\u00f3 tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t \u0111\u1ecbnh ngh\u0129a l\u1edbp. Ng\u01b0\u1eddi \u0111\u1ecdc kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c gi\u1eefa \u0111\u1ecbnh ngh\u0129a ki\u1ec3u d\u1eef li\u1ec7u v\u00e0 d\u1eef li\u1ec7u th\u1ef1c t\u1ebf. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn s\u1ef1 m\u01a1 h\u1ed3 trong qu\u00e1 tr\u00ecnh sinh m\u00e3 ho\u1eb7c thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n<h3>S\u1eeda ch\u1eefa<\/h3>\n<p>Lu\u00f4n s\u1eed d\u1ee5ng c\u00fa ph\u00e1p d\u1ea5u hai ch\u1ea5m. V\u00ed d\u1ee5,<code>khachhang1 : Kh\u00e1ch_h\u00e0ng<\/code> ho\u1eb7c<code>donhang45 : \u0110\u01a1n_h\u00e0ng<\/code>. \u0110i\u1ec1u n\u00e0y tr\u1ef1c quan cho th\u1ea5y h\u1ed9p n\u00e0y \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ef1c th\u1ec3 c\u1ee5 th\u1ec3 \u0111ang t\u1ed3n t\u1ea1i trong b\u1ed9 nh\u1edb, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t m\u1eabu chung.<\/p>\n<h3>So s\u00e1nh tr\u1ef1c quan<\/h3>\n<table>\n<thead>\n<tr>\n<th>K\u00fd hi\u1ec7u sai<\/th>\n<th>K\u00fd hi\u1ec7u \u0111\u00fang<\/th>\n<th>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>Kh\u00e1ch h\u00e0ng<\/code><\/td>\n<td><code>johnDoe : Kh\u00e1ch h\u00e0ng<\/code><\/td>\n<td>L\u00e0m r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1ec3 hi\u1ec7n v\u00e0 ki\u1ec3u<\/td>\n<\/tr>\n<tr>\n<td><code>T\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng<\/code><\/td>\n<td><code>acc123 : T\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng<\/code><\/td>\n<td>Ng\u0103n ng\u1eeba s\u1ef1 nh\u1ea7m l\u1eabn v\u1edbi c\u1ea5u tr\u00fac l\u1edbp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Sai l\u1ea7m 2: B\u1ecf qua c\u00e1c r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1 \ud83d\udcc9<\/h2>\n<p>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 k\u1ebft v\u1edbi m\u1ed9t l\u1edbp kh\u00e1c. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, b\u1ea1n \u0111ang xem x\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. Th\u01b0\u1eddng th\u00ec ng\u01b0\u1eddi t\u1ea1o v\u1ebd c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i m\u00e0 kh\u00f4ng tu\u00e2n theo c\u00e1c quy t\u1eafc b\u1ed9i s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 l\u1edbp.<\/p>\n<h3>L\u1ed7i sai<\/h3>\n<p>T\u1ea1o li\u00ean k\u1ebft gi\u1eefa hai \u0111\u1ed1i t\u01b0\u1ee3ng vi ph\u1ea1m b\u1ed9i s\u1ed1 \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t<code>B\u1ed9 ph\u1eadn<\/code> c\u00f3 th\u1ec3 c\u00f3 <code>0..*<\/code> <code>Nh\u00e2n vi\u00ean<\/code>, nh\u01b0ng s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n cho th\u1ea5y m\u1ed9t <code>B\u1ed9 ph\u1eadn<\/code> li\u00ean k\u1ebft v\u1edbi ba <code>Nh\u00e2n vi\u00ean<\/code>m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 d\u1ea5u hi\u1ec7u n\u00e0o v\u1ec1 t\u1eadp h\u1ee3p, \u0111i\u1ec1u n\u00e0y ng\u1ee5 \u00fd sai l\u1ea7m v\u1ec1 m\u1ed1i quan h\u1ec7 1:1.<\/p>\n<h3>T\u00e1c \u0111\u1ed9ng k\u1ef9 thu\u1eadt<\/h3>\n<p>C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 hi\u1ec3u c\u00e1c r\u00e0ng bu\u1ed9c d\u1eef li\u1ec7u. N\u1ebfu s\u01a1 \u0111\u1ed3 ng\u1ee5 \u00fd m\u1ed1i quan h\u1ec7 m\u1ed9t-m\u1ed9t trong khi th\u1ef1c t\u1ebf l\u00e0 m\u1ed9t-nhi\u1ec1u, l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a sai. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c tr\u00f9ng l\u1eb7p d\u1eef li\u1ec7u ho\u1eb7c l\u1ed7i to\u00e0n v\u1eb9n tham chi\u1ebfu.<\/p>\n<h3>Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/h3>\n<ul>\n<li>\u0110\u1ea3m b\u1ea3o s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft ph\u00f9 h\u1ee3p v\u1edbi ph\u1ea1m vi b\u1ed9i s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong m\u00f4 h\u00ecnh l\u1edbp.<\/li>\n<li>S\u1eed d\u1ee5ng t\u1eadp h\u1ee3p ho\u1eb7c m\u1ea3ng trong k\u00fd hi\u1ec7u \u0111\u1ed1i t\u01b0\u1ee3ng n\u1ebfu nhi\u1ec1u th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n.<\/li>\n<li>Ghi nh\u00e3n c\u00e1c \u0111\u1ea7u n\u1ed1i b\u1eb1ng b\u1ed9i s\u1ed1 th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c quan s\u00e1t trong b\u1ea3n ch\u1ee5p.<\/li>\n<\/ul>\n<h2>Sai l\u1ea7m 3: Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh kh\u00f4ng nh\u1ea5t qu\u00e1n \ud83d\udcdd<\/h2>\n<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 \u0111\u1ed9c \u0111\u00e1o v\u00ec ch\u00fang hi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf. Tuy nhi\u00ean, nhi\u1ec1u ng\u01b0\u1eddi t\u1ea1o b\u1ecf tr\u1ed1ng ho\u00e0n to\u00e0n gi\u00e1 tr\u1ecb ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c ch\u1ed7 tr\u1ed1ng nh\u01b0<code>null<\/code> ho\u1eb7c <code>r\u1ed7ng<\/code> kh\u00f4ng nh\u1ea5t qu\u00e1n.<\/p>\n<h3>L\u1ed7i<\/h3>\n<p>B\u1ecf tr\u1ed1ng c\u00e1c thu\u1ed9c t\u00ednh khi ch\u00fang quan tr\u1ecdng \u0111\u1ed1i v\u1edbi tr\u1ea1ng th\u00e1i. V\u00ed d\u1ee5, m\u1ed9t <code>\u0110\u01a1n h\u00e0ng<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 kh\u00f4ng c\u00f3 <code>tr\u1ea1ng th\u00e1i<\/code> ho\u1eb7c <code>t\u1ed5ng s\u1ed1 ti\u1ec1n<\/code> \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0 kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7. Thay v\u00e0o \u0111\u00f3, s\u1eed d\u1ee5ng c\u00e1c gi\u00e1 tr\u1ecb chung nh\u01b0 <code>test123<\/code> cho t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1ebd l\u00e0m gi\u1ea3m \u0111\u1ed9 r\u00f5 r\u00e0ng.<\/p>\n<h3>S\u1eeda ch\u1eefa<\/h3>\n<p>\u0110i\u1ec1n \u0111\u1ea7y \u0111\u1ee7 c\u00e1c thu\u1ed9c t\u00ednh b\u1eb1ng d\u1eef li\u1ec7u th\u1ef1c t\u1ebf ph\u1ea3n \u00e1nh t\u00ecnh hu\u1ed1ng. N\u1ebfu m\u1ed9t \u0111\u01a1n h\u00e0ng \u0111ang ch\u1edd x\u1eed l\u00fd, h\u00e3y ghi r\u00f5 <code>tr\u1ea1ng th\u00e1i = \u0111ang ch\u1edd<\/code>. N\u1ebfu m\u1ed9t t\u00e0i kho\u1ea3n kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng, h\u00e3y \u0111\u1eb7t <code>isActive = false<\/code>. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c b\u00ean li\u00ean quan x\u00e1c minh t\u00ednh h\u1ee3p l\u00fd c\u1ee7a logic.<\/p>\n<h3>Khi n\u00e0o n\u00ean b\u1ecf qua gi\u00e1 tr\u1ecb<\/h3>\n<p>Kh\u00f4ng ph\u1ea3i m\u1ecdi thu\u1ed9c t\u00ednh n\u00e0o c\u0169ng c\u1ea7n c\u00f3 gi\u00e1 tr\u1ecb trong m\u1ecdi s\u01a1 \u0111\u1ed3. T\u1eadp trung v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh li\u00ean quan \u0111\u1ebfn t\u00ecnh hu\u1ed1ng \u0111ang \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a. N\u1ebfu s\u01a1 \u0111\u1ed3 li\u00ean quan \u0111\u1ebfn \u0111i\u1ec1u h\u01b0\u1edbng, h\u00e3y t\u1eadp trung v\u00e0o c\u00e1c li\u00ean k\u1ebft. N\u1ebfu li\u00ean quan \u0111\u1ebfn x\u00e1c th\u1ef1c, h\u00e3y t\u1eadp trung v\u00e0o c\u00e1c c\u1edd tr\u1ea1ng th\u00e1i.<\/p>\n<h2>L\u1ed7i 4: L\u00e0m ph\u1ee9c t\u1ea1p h\u00f3a ph\u1ea1m vi \ud83c\udf10<\/h2>\n<p>M\u1ed9t v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn l\u00e0 c\u1ed1 g\u1eafng m\u00f4 h\u00ecnh h\u00f3a to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng trong m\u1ed9t s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng duy nh\u1ea5t. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 c\u00e1c b\u1ee9c \u1ea3nh ch\u1ee5p nhanh. M\u1ed9t s\u01a1 \u0111\u1ed3 duy nh\u1ea5t n\u00ean t\u1eadp trung v\u00e0o m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 ho\u1eb7c m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a m\u00f4 h\u00ecnh d\u1eef li\u1ec7u.<\/p>\n<h3>L\u1ed7i<\/h3>\n<p>V\u1ebd h\u00e0ng ng\u00e0n \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 \u0111\u1ea1i di\u1ec7n cho to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t h\u00ecnh \u1ea3nh l\u1ed9n x\u1ed9n, g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y tr\u00e1i ng\u01b0\u1ee3c v\u1edbi m\u1ee5c \u0111\u00edch c\u1ee7a tr\u1eebu t\u01b0\u1ee3ng h\u00f3a.<\/p>\n<h3>H\u1eadu qu\u1ea3<\/h3>\n<p>Ng\u01b0\u1eddi \u0111\u1ecdc kh\u00f4ng th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c m\u1ed1i quan h\u1ec7 quan tr\u1ecdng. S\u01a1 \u0111\u1ed3 tr\u1edf th\u00e0nh m\u1ed9t b\u1ee9c t\u01b0\u1eddng ch\u1eef v\u00e0 khung. Vi\u1ec7c b\u1ea3o tr\u00ec tr\u1edf th\u00e0nh th\u1ea3m h\u1ecda v\u00ec vi\u1ec7c c\u1eadp nh\u1eadt m\u1ed9t ph\u1ea7n nh\u1ecf c\u0169ng \u0111\u00f2i h\u1ecfi ph\u1ea3i v\u1ebd l\u1ea1i to\u00e0n b\u1ed9 s\u01a1 \u0111\u1ed3 l\u1ed9n x\u1ed9n n\u00e0y.<\/p>\n<h3>Chi\u1ebfn l\u01b0\u1ee3c v\u1ec1 ph\u1ea1m vi<\/h3>\n<ul>\n<li><strong>T\u1eadp trung v\u00e0o c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng:<\/strong> T\u1ea1o m\u1ed9t s\u01a1 \u0111\u1ed3 cho lu\u1ed3ng \u0111\u0103ng nh\u1eadp, m\u1ed9t s\u01a1 \u0111\u1ed3 kh\u00e1c cho lu\u1ed3ng thanh to\u00e1n.<\/li>\n<li><strong>H\u1ea1n ch\u1ebf s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> Gi\u1eef s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n \u1edf m\u1ee9c c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t (v\u00ed d\u1ee5: t\u1eeb 5 \u0111\u1ebfn 15 \u0111\u1ed1i t\u01b0\u1ee3ng).<\/li>\n<li><strong>Nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan:<\/strong>S\u1eed d\u1ee5ng khung ho\u1eb7c ng\u0103n \u0111\u1ec3 nh\u00f3m c\u00e1c th\u1ec3 hi\u1ec7n li\u00ean quan.<\/li>\n<\/ul>\n<h2>Sai l\u1ea7m 5: Bi\u1ec3u di\u1ec5n sai c\u00e1c m\u1ed1i quan h\u1ec7 v\u00e0 s\u1ef1 t\u00edch h\u1ee3p \ud83d\udd17<\/h2>\n<p>C\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n ch\u00ednh x\u00e1c. C\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t m\u1ed1i quan h\u1ec7 \u0111\u01a1n gi\u1ea3n, s\u1ef1 t\u00edch h\u1ee3p v\u00e0 s\u1ef1 k\u1ebft h\u1ee3p. Nh\u1eefng sai s\u00f3t \u1edf \u0111\u00e2y g\u00e2y nh\u1ea7m l\u1eabn v\u1ec1 quy\u1ec1n s\u1edf h\u1eefu v\u00e0 v\u00f2ng \u0111\u1eddi.<\/p>\n<h3>Sai l\u1ea7m<\/h3>\n<p>S\u1eed d\u1ee5ng m\u1ed9t \u0111\u01b0\u1eddng \u0111\u01a1n gi\u1ea3n cho m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p ng\u1ee5 \u00fd r\u1eb1ng \u0111\u1ed1i t\u01b0\u1ee3ng con kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1ed1i t\u01b0\u1ee3ng cha. M\u1ed9t \u0111\u01b0\u1eddng \u0111\u01a1n gi\u1ea3n ng\u1ee5 \u00fd s\u1ef1 li\u00ean k\u1ebft l\u1ecfng l\u1ebbo.<\/p>\n<h3>S\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 h\u00ecnh \u1ea3nh<\/h3>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\n<th>K\u00fd hi\u1ec7u h\u00ecnh \u1ea3nh<\/th>\n<th>H\u1ec7 qu\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u1ed1i quan h\u1ec7<\/td>\n<td>\u0110\u01b0\u1eddng \u0111\u01a1n gi\u1ea3n<\/td>\n<td>K\u1ebft n\u1ed1i l\u1ecfng l\u1ebbo, v\u00f2ng \u0111\u1eddi \u0111\u1ed9c l\u1eadp.<\/td>\n<\/tr>\n<tr>\n<td>S\u1ef1 t\u00edch h\u1ee3p<\/td>\n<td>H\u00ecnh kim c\u01b0\u01a1ng r\u1ed7ng<\/td>\n<td>M\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n, c\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/td>\n<\/tr>\n<tr>\n<td>S\u1ef1 k\u1ebft h\u1ee3p<\/td>\n<td>H\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y<\/td>\n<td>Quy\u1ec1n s\u1edf h\u1eefu m\u1ea1nh, c\u00e1c ph\u1ea7n ch\u1ebft c\u00f9ng to\u00e0n th\u1ec3.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Sai l\u1ea7m ph\u1ed5 bi\u1ebfn<\/h3>\n<p>S\u1eed d\u1ee5ng h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y cho m\u1ed9t m\u1ed1i quan h\u1ec7 th\u1ef1c t\u1ebf l\u00e0 t\u00f9y ch\u1ecdn. N\u1ebfu m\u1ed1i quan h\u1ec7 l\u00e0 t\u00f9y ch\u1ecdn, h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y s\u1ebd g\u00e2y hi\u1ec3u l\u1ea7m. N\u00f3 ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu b\u1eaft bu\u1ed9c. Lu\u00f4n x\u00e1c minh c\u00e1c quy t\u1eafc v\u00f2ng \u0111\u1eddi tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng k\u00fd hi\u1ec7u kim c\u01b0\u01a1ng.<\/p>\n<h2>Sai l\u1ea7m 6: B\u1ecf qua c\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec1u h\u01b0\u1edbng \ud83e\udded<\/h2>\n<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 hi\u1ec3u c\u00e1ch l\u1eadp tr\u00ecnh vi\u00ean \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ed3 th\u1ecb \u0111\u1ed1i t\u01b0\u1ee3ng. N\u1ebfu c\u00e1c m\u0169i t\u00ean ho\u1eb7c nh\u00e3n li\u00ean k\u1ebft kh\u00f4ng ch\u1ec9 r\u00f5 h\u01b0\u1edbng, s\u01a1 \u0111\u1ed3 s\u1ebd \u00edt h\u1eefu \u00edch h\u01a1n cho vi\u1ec7c l\u1eadp tr\u00ecnh.<\/p>\n<h3>Sai l\u1ea7m<\/h3>\n<p>S\u1eed d\u1ee5ng \u0111\u01b0\u1eddng n\u1ed1i hai chi\u1ec1u khi m\u00e3 ngu\u1ed3n ch\u1ec9 cho ph\u00e9p truy c\u1eadp m\u1ed9t chi\u1ec1u. V\u00ed d\u1ee5, m\u1ed9t <code>L\u00e1i xe<\/code> bi\u1ebft m\u1ed9t <code>Xe h\u01a1i<\/code>, nh\u01b0ng chi\u1ebfc <code>Xe h\u01a1i<\/code> kh\u00f4ng l\u01b0u tr\u1eef m\u1ed9t tham chi\u1ebfu quay l\u1ea1i <code>L\u00e1i xe<\/code>. N\u1ebfu b\u1ea1n v\u1ebd m\u1ed9t \u0111\u01b0\u1eddng v\u1edbi h\u00ecnh kim c\u01b0\u01a1ng \u1edf c\u1ea3 hai \u0111\u1ea7u, b\u1ea1n ng\u1ee5 \u00fd truy c\u1eadp hai chi\u1ec1u.<\/p>\n<h3>S\u1eeda l\u1ed7i<\/h3>\n<ul>\n<li>S\u1eed d\u1ee5ng m\u0169i t\u00ean \u0111\u1ec3 ch\u1ec9 h\u01b0\u1edbng \u0111i\u1ec1u h\u01b0\u1edbng.<\/li>\n<li>Ghi nh\u00e3n cho li\u00ean k\u1ebft b\u1eb1ng t\u00ean vai tr\u00f2 n\u1ebfu c\u1ea7n thi\u1ebft.<\/li>\n<li>\u0110\u1ea3m b\u1ea3o h\u01b0\u1edbng \u0111i kh\u1edbp v\u1edbi tri\u1ec3n khai getter\/setter trong m\u00e3 ngu\u1ed3n.<\/li>\n<\/ul>\n<h2>L\u1ed7i 7: Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean kh\u00f4ng nh\u1ea5t qu\u00e1n \ud83c\udff7\ufe0f<\/h2>\n<p>\u0110\u1eb7t t\u00ean l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong t\u00e0i li\u1ec7u. Vi\u1ec7c \u0111\u1eb7t t\u00ean kh\u00f4ng nh\u1ea5t qu\u00e1n khi\u1ebfn s\u01a1 \u0111\u1ed3 kh\u00f3 qu\u00e9t v\u00e0 tham kh\u1ea3o.<\/p>\n<h3>L\u1ed7i<\/h3>\n<p>S\u1eed d\u1ee5ng <code>obj1<\/code>, <code>tempVar<\/code>, <code>User123<\/code>, v\u00e0 <code>customer_instance<\/code> trong c\u00f9ng m\u1ed9t s\u01a1 \u0111\u1ed3. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra t\u1ea3i nh\u1eadn th\u1ee9c. Ng\u01b0\u1eddi \u0111\u1ecdc d\u00e0nh th\u1eddi gian gi\u1ea3i m\u00e3 t\u00ean thay v\u00ec hi\u1ec3u m\u1ed1i quan h\u1ec7.<\/p>\n<h3>Quy \u01b0\u1edbc \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb<\/h3>\n<ul>\n<li>S\u1eed d\u1ee5ng t\u00ean m\u00f4 t\u1ea3 d\u1ef1a tr\u00ean vai tr\u00f2 trong t\u00ecnh hu\u1ed1ng.<\/li>\n<li>\u0110\u1eb7t ti\u1ec1n t\u1ed1 l\u00e0 t\u00ean l\u1edbp n\u1ebfu vai tr\u00f2 mang t\u00ednh chung (v\u00ed d\u1ee5: <code>primaryUser<\/code>).<\/li>\n<li>Tr\u00e1nh d\u00f9ng s\u1ed1 chung tr\u1eeb khi ch\u00fang \u0111\u1ea1i di\u1ec7n cho m\u1ed9t ID c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: <code>order_554<\/code>).<\/li>\n<li>Gi\u1eef cho vi\u1ec7c \u0111\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c s\u01a1 \u0111\u1ed3 trong d\u1ef1 \u00e1n.<\/li>\n<\/ul>\n<h2>L\u1ed7i 8: B\u1ecf qua t\u00ednh k\u1ebf th\u1eeba trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \ud83c\udfdb\ufe0f<\/h2>\n<p>M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng t\u1eadp trung v\u00e0o c\u00e1c th\u1ec3 hi\u1ec7n, t\u00ednh k\u1ebf th\u1eeba v\u1eabn \u0111\u00f3ng vai tr\u00f2. N\u1ebfu m\u1ed9t l\u1edbp l\u00e0 l\u1edbp con c\u1ee7a l\u1edbp kh\u00e1c, th\u1ec3 hi\u1ec7n \u0111\u00f3 n\u00ean ph\u1ea3n \u00e1nh r\u00f5 r\u00e0ng ki\u1ec3u lo\u1ea1i \u0111\u00f3.<\/p>\n<h3>L\u1ed7i<\/h3>\n<p>Gom t\u1ea5t c\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n v\u00e0o ki\u1ec3u l\u1edbp cha. N\u1ebfu b\u1ea1n c\u00f3 m\u1ed9t l\u1edbp<code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code> l\u1edbp v\u00e0 <code>Xe h\u01a1i<\/code> v\u00e0 <code>Xe t\u1ea3i<\/code> c\u00e1c l\u1edbp con, m\u1ed9t th\u1ec3 hi\u1ec7n n\u00ean \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n l\u00e0<code>myCar : Xe h\u01a1i<\/code>, kh\u00f4ng ph\u1ea3i<code>myCar : Ph\u01b0\u01a1ng ti\u1ec7n<\/code>.<\/p>\n<h3>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng<\/h3>\n<p>C\u00e1c l\u1edbp con th\u01b0\u1eddng c\u00f3 thu\u1ed9c t\u00ednh ho\u1eb7c h\u00e0nh vi kh\u00e1c nhau. \u0110\u00e1nh nh\u00e3n m\u1ed9t th\u1ec3 hi\u1ec7n l\u00e0 l\u1edbp cha s\u1ebd che gi\u1ea5u c\u00e1c thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3 c\u1ee7a l\u1edbp con. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i ki\u1ec3u n\u1ebfu m\u00e3 ngu\u1ed3n ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u1eb7c th\u00f9 c\u1ee7a l\u1edbp con.<\/p>\n<h2>L\u1ed7i 9: Kh\u00f4ng c\u1eadp nh\u1eadt khi c\u00f3 thay \u0111\u1ed5i trong h\u1ec7 th\u1ed1ng \ud83d\udd04<\/h2>\n<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng bi\u1ec3u di\u1ec5n m\u1ed9t tr\u1ea1ng th\u00e1i. H\u1ec7 th\u1ed1ng thay \u0111\u1ed5i theo th\u1eddi gian. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c t\u1ea1o h\u00f4m nay c\u00f3 th\u1ec3 l\u1ed7i th\u1eddi ng\u00e0y mai. Sai l\u1ea7m l\u00e0 coi s\u01a1 \u0111\u1ed3 nh\u01b0 m\u1ed9t t\u00e0i s\u1ea3n t\u0129nh kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i.<\/p>\n<h3>R\u1ee7i ro<\/h3>\n<p>C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n tu\u00e2n theo s\u01a1 \u0111\u1ed3 c\u0169 v\u00e0 tri\u1ec3n khai logic c\u0169. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra n\u1ee3 k\u1ef9 thu\u1eadt. T\u00e0i li\u1ec7u t\u00e1ch bi\u1ec7t kh\u1ecfi m\u00e3 ngu\u1ed3n.<\/p>\n<h3>Chi\u1ebfn l\u01b0\u1ee3c b\u1ea3o tr\u00ec<\/h3>\n<ul>\n<li>Xem x\u00e9t l\u1ea1i c\u00e1c s\u01a1 \u0111\u1ed3 trong c\u00e1c bu\u1ed5i t\u1ed5ng k\u1ebft sprint.<\/li>\n<li>C\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3 khi m\u1ed9t t\u00ednh n\u0103ng ch\u00ednh thay \u0111\u1ed5i m\u00f4 h\u00ecnh d\u1eef li\u1ec7u.<\/li>\n<li>Phi\u00ean b\u1ea3n h\u00f3a c\u00e1c s\u01a1 \u0111\u1ed3 n\u1ebfu h\u1ec7 th\u1ed1ng c\u00f3 nhi\u1ec1u c\u1ea5u h\u00ecnh ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<\/ul>\n<h2>Ph\u00e2n t\u00edch s\u00e2u: M\u1ed1i quan h\u1ec7 gi\u1eefa s\u01a1 \u0111\u1ed3 l\u1edbp v\u00e0 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udd0d<\/h2>\n<p>R\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u c\u00e1ch hai s\u01a1 \u0111\u1ed3 n\u00e0y t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 h\u1ee3p \u0111\u1ed3ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 th\u1ef1c thi.<\/p>\n<h3>S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh<\/h3>\n<ul>\n<li><strong>S\u01a1 \u0111\u1ed3 l\u1edbp:<\/strong> X\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac, ph\u01b0\u01a1ng th\u1ee9c, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 m\u1ed9t c\u00e1ch chung chung. N\u00f3 l\u00e0 v\u0129nh vi\u1ec5n.<\/li>\n<li><strong>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> X\u00e1c \u0111\u1ecbnh m\u1ed9t t\u1eadp h\u1ee3p c\u1ee5 th\u1ec3 c\u00e1c th\u1ec3 hi\u1ec7n v\u00e0 gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i c\u1ee7a ch\u00fang. N\u00f3 mang t\u00ednh th\u1eddi gian.<\/li>\n<\/ul>\n<h3>Quy tr\u00ecnh x\u00e1c th\u1ef1c<\/h3>\n<p>Tr\u01b0\u1edbc khi ho\u00e0n t\u1ea5t m\u1ed9t s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng, h\u00e3y x\u00e1c minh n\u00f3 v\u1edbi s\u01a1 \u0111\u1ed3 L\u1edbp. H\u00e3y \u0111\u1eb7t ra nh\u1eefng c\u00e2u h\u1ecfi sau:<\/p>\n<ol>\n<li>M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng trong s\u01a1 \u0111\u1ed3 c\u00f3 m\u1ed9t l\u1edbp t\u01b0\u01a1ng \u1ee9ng kh\u00f4ng?<\/li>\n<li>T\u1ea5t c\u1ea3 c\u00e1c li\u00ean k\u1ebft trong s\u01a1 \u0111\u1ed3 c\u00f3 t\u1ed3n t\u1ea1i trong s\u01a1 \u0111\u1ed3 L\u1edbp kh\u00f4ng?<\/li>\n<li>C\u00e1c ki\u1ec3u thu\u1ed9c t\u00ednh c\u00f3 nh\u1ea5t qu\u00e1n v\u1edbi \u0111\u1ecbnh ngh\u0129a l\u1edbp kh\u00f4ng?<\/li>\n<li>C\u00e1c r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1 c\u00f3 kh\u1edbp nhau kh\u00f4ng?<\/li>\n<\/ol>\n<h2>Xem x\u00e9t n\u00e2ng cao: Chu\u1ea9n h\u00f3a v\u00e0 B\u1ea3o t\u1ed3n d\u1eef li\u1ec7u \ud83d\uddc4\ufe0f<\/h2>\n<p>Khi thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef tr\u1ea1ng th\u00e1i (c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u1ec7 th\u1ed1ng t\u1ec7p), s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng gi\u00fap h\u00ecnh dung qu\u00e1 tr\u00ecnh chu\u1ea9n h\u00f3a. M\u1ed9t sai l\u1ea7m ph\u1ed5 bi\u1ebfn l\u00e0 b\u1ecf qua c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/p>\n<h3>L\u1ed7i<\/h3>\n<p>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong b\u1ed9 nh\u1edb m\u00e0 kh\u00f4ng xem x\u00e9t c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 v\u00e0o l\u01b0u tr\u1eef. V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed3 th\u1ecb c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 l\u00e0 v\u00f2ng l\u1eb7p. Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u00e1c tham chi\u1ebfu v\u00f2ng c\u00f3 th\u1ec3 g\u00e2y ra v\u1ea5n \u0111\u1ec1 n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u0111\u00fang c\u00e1ch.<\/p>\n<h3>S\u1eeda ch\u1eefa<\/h3>\n<p>Ph\u00e2n t\u00edch s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 t\u00ecm chu tr\u00ecnh. N\u1ebfu b\u1ea1n th\u1ea5y<code>A<\/code>li\u00ean k\u1ebft v\u1edbi<code>B<\/code>v\u00e0<code>B<\/code>li\u00ean k\u1ebft ng\u01b0\u1ee3c l\u1ea1i v\u1edbi<code>A<\/code>, h\u00e3y c\u00e2n nh\u1eafc c\u00e1ch th\u1ee9c l\u01b0u tr\u1eef d\u1eef li\u1ec7u n\u00e0y. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 y\u00eau c\u1ea7u ng\u1eaft k\u1ebft n\u1ed1i trong l\u01b0u tr\u1eef ho\u1eb7c s\u1eed d\u1ee5ng kh\u00f3a ngo\u1ea1i m\u1ed9t c\u00e1ch c\u1ea9n tr\u1ecdng.<\/p>\n<h2>T\u00f3m t\u1eaft c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u2705<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng UML ch\u1ea5t l\u01b0\u1ee3ng cao, h\u00e3y tu\u00e2n theo nh\u1eefng nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i sau:<\/p>\n<ul>\n<li><strong>S\u1eed d\u1ee5ng c\u00fa ph\u00e1p Th\u1ec3 hi\u1ec7n:<\/strong>Lu\u00f4n \u0111\u00e1nh d\u1ea5u c\u00e1c h\u1ed9p l\u00e0<code>t\u00ean : Ki\u1ec3u<\/code>.<\/li>\n<li><strong>T\u00f4n tr\u1ecdng B\u1ed9i s\u1ed1:<\/strong>\u0110\u1ea3m b\u1ea3o s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft kh\u1edbp v\u1edbi quy t\u1eafc b\u1ed9i s\u1ed1.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh Ph\u1ea1m vi:<\/strong>T\u1eadp trung v\u00e0o c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3, ch\u1ee9 kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<li><strong>\u0110\u00e1nh d\u1ea5u M\u1ed1i quan h\u1ec7:<\/strong> S\u1eed d\u1ee5ng m\u0169i t\u00ean v\u00e0 t\u00ean vai tr\u00f2 \u0111\u1ec3 th\u1ec3 hi\u1ec7n \u0111i\u1ec1u h\u01b0\u1edbng.<\/li>\n<li><strong>\u0110i\u1ec1n gi\u00e1 tr\u1ecb:<\/strong>Hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u thu\u1ed9c t\u00ednh th\u1ef1c t\u1ebf khi ph\u00f9 h\u1ee3p.<\/li>\n<li><strong>Duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>S\u1eed d\u1ee5ng t\u00ean nh\u1ea5t qu\u00e1n tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c s\u01a1 \u0111\u1ed3.<\/li>\n<li><strong>X\u00e1c minh \u0111\u1ed1i chi\u1ebfu v\u1edbi c\u00e1c l\u1edbp:<\/strong>\u0110\u1ea3m b\u1ea3o m\u1ed7i th\u1ec3 hi\u1ec7n \u0111\u1ec1u \u00e1nh x\u1ea1 \u0111\u1ebfn \u0111\u1ecbnh ngh\u0129a l\u1edbp h\u1ee3p l\u1ec7.<\/li>\n<\/ul>\n<h2>C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u2753<\/h2>\n<h3>T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n h\u00e0nh vi \u0111\u1ed9ng kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 t\u0129nh. Ch\u00fang th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i, ch\u1ee9 kh\u00f4ng ph\u1ea3i h\u00e0nh vi. \u0110\u1ec3 th\u1ec3 hi\u1ec7n h\u00e0nh vi, h\u00e3y s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ho\u1eb7c s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng. Vi\u1ec7c s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n lu\u1ed3ng s\u1ebd g\u00e2y nh\u1ea7m l\u1eabn cho ng\u01b0\u1eddi \u0111\u1ecdc.<\/p>\n<h3>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 b\u1eaft bu\u1ed9c trong m\u1ecdi d\u1ef1 \u00e1n kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng v\u1eady. \u0110\u1ed1i v\u1edbi c\u00e1c d\u1ef1 \u00e1n \u0111\u01a1n gi\u1ea3n, ch\u00fang c\u00f3 th\u1ec3 th\u1eeba. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p c\u00f3 m\u1ed1i quan h\u1ec7 d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, ch\u00fang v\u00f4 c\u00f9ng qu\u00fd gi\u00e1 trong vi\u1ec7c g\u1ee1 l\u1ed7i v\u00e0 hi\u1ec3u tr\u1ea1ng th\u00e1i.<\/p>\n<h3>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c t\u1eadp h\u1ee3p trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng?<\/h3>\n<p>B\u1ea1n c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n m\u1ed9t t\u1eadp h\u1ee3p b\u1eb1ng c\u00e1ch v\u1ebd nhi\u1ec1u \u0111\u01b0\u1eddng n\u1ed1i \u0111\u1ebfn c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u danh s\u00e1ch b\u00ean trong h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng (v\u00ed d\u1ee5, <code>\u0111\u01a1n h\u00e0ng: Danh s\u00e1ch&lt;\u0110\u01a1n h\u00e0ng&gt;<\/code>). H\u00e3y r\u00f5 r\u00e0ng v\u1ec1 vi\u1ec7c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang gi\u1eef tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t t\u1eadp h\u1ee3p hay c\u00e1c th\u1ec3 hi\u1ec7n ri\u00eang l\u1ebb.<\/p>\n<h2>Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a s\u01a1 \u0111\u1ed3 \ud83c\udfaf<\/h2>\n<p>\u0110\u1ed9 ch\u00ednh x\u00e1c trong m\u00f4 h\u00ecnh h\u00f3a kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ef1 ho\u00e0n h\u1ea3o; \u0111\u00f3 l\u00e0 v\u1ec1 giao ti\u1ebfp. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n h\u00f3a nh\u1eb9 nh\u00e0ng nh\u01b0ng ch\u00ednh x\u00e1c s\u1ebd t\u1ed1t h\u01a1n m\u1ed9t s\u01a1 \u0111\u1ed3 ph\u1ee9c t\u1ea1p g\u00e2y nh\u1ea7m l\u1eabn. Tr\u00e1nh nh\u1eefng sai l\u1ea7m \u0111\u01b0\u1ee3c n\u00eau \u1edf tr\u00ean \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n th\u1ef1c hi\u1ec7n \u0111\u00fang m\u1ee5c \u0111\u00edch: l\u00e0m r\u00f5 h\u1ec7 th\u1ed1ng cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 b\u00ean li\u00ean quan.<\/p>\n<p>B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o k\u00fd hi\u1ec7u, ph\u1ea1m vi v\u00e0 m\u1ed1i quan h\u1ec7, b\u1ea1n s\u1ebd t\u1ea1o ra nh\u1eefng s\u01a1 \u0111\u1ed3 v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian. Ch\u00fang tr\u1edf th\u00e0nh t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng h\u1ed7 tr\u1ee3 qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n thay v\u00ec r\u00e0o c\u1ea3n. H\u00e3y gi\u1eef cho s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n s\u1ea1ch s\u1ebd, nh\u1ea5t qu\u00e1n v\u00e0 t\u1eadp trung v\u00e0o tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 b\u1ea1n mu\u1ed1n truy\u1ec1n \u0111\u1ea1t.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML \u0111\u00f3ng vai tr\u00f2 l\u00e0 nh\u1eefng b\u1ee9c \u1ea3nh t\u0129nh quan tr\u1ecdng v\u1ec1 tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp, v\u1ed1n \u0111\u1ecbnh ngh\u0129a b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u00f4 t\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n th\u1ef1c t\u1ebf v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1513,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,45],"class_list":["post-1512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-object-diagram"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn khi t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML \ud83d\uded1<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c sai l\u1ea7m ph\u1ed5 bi\u1ebfn \u0111\u1ec3 tr\u00e1nh khi t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML. 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