{"id":2023,"date":"2026-08-07T09:53:28","date_gmt":"2026-08-07T09:53:28","guid":{"rendered":"https:\/\/www.ez-knowledge.com\/vn\/mastering-uml-sequence-diagrams-a-comprehensive-guide-to-modeling-dynamic-interactions\/"},"modified":"2026-08-07T09:53:28","modified_gmt":"2026-08-07T09:53:28","slug":"mastering-uml-sequence-diagrams-a-comprehensive-guide-to-modeling-dynamic-interactions","status":"publish","type":"post","link":"https:\/\/www.ez-knowledge.com\/vn\/mastering-uml-sequence-diagrams-a-comprehensive-guide-to-modeling-dynamic-interactions\/","title":{"rendered":"Th\u00e0nh th\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c \u0111\u1ed9ng"},"content":{"rendered":"<h2>Gi\u1edbi thi\u1ec7u<\/h2>\n<p>Trong th\u1ebf gi\u1edbi k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m v\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng, vi\u1ec7c hi\u1ec3u r\u00f5<em>c\u00e1ch<\/em>c\u00e1c th\u00e0nh ph\u1ea7n t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng kh\u00f4ng k\u00e9m g\u00ec vi\u1ec7c bi\u1ebft<em>ch\u00fang l\u00e0 g\u00ec<\/em>c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u00f3 l\u00e0 g\u00ec. Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp cung c\u1ea5p c\u00e1i nh\u00ecn t\u0129nh v\u1ec1 c\u1ea5u tr\u00fac h\u1ec7 th\u1ed1ng,<strong><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\">UML<\/a> <a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/a><\/strong><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-sequence-diagram\/\">\u00a0<\/a>cung c\u1ea5p m\u1ed9t<a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/behavior-vs-structural-diagram\/\">g\u00f3c nh\u00ecn \u0111\u1ed9ng<\/a>. Ch\u00fang l\u00e0 c\u00e1c s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c m\u00f4 t\u1ea3 chi ti\u1ebft c\u00e1ch c\u00e1c thao t\u00e1c \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, ghi l\u1ea1i s\u1ef1 h\u1ee3p t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m, ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n, s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ec3 tr\u1ef1c quan h\u00f3a lu\u1ed3ng logic, x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m ngh\u1ebdn v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u1ee9c t\u1ea1p \u0111\u01b0\u1ee3c tri\u1ec3n khai \u0111\u00fang c\u00e1ch. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i, k\u00fd hi\u1ec7u v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 t\u1ea1o ra<a href=\"https:\/\/www.sparxsystems.us\/guides\/uml-with-sparx-ea\/diagrams\/\">c\u00e1c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 hi\u1ec7u qu\u1ea3<\/a>, \u0111\u1ea7y \u0111\u1ee7 v\u00ed d\u1ee5 PlantUML \u0111\u1ec3 gi\u00fap b\u1ea1n m\u00f4 h\u00ecnh h\u00f3a tr\u01b0\u1edbc khi vi\u1ebft m\u00e3.<\/p>\n<hr\/>\n<h2>S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 g\u00ec?<\/h2>\n<p>S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c th\u1ec3 hi\u1ec7n c\u00e1ch c\u00e1c qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng v\u1edbi nhau v\u00e0 theo th\u1ee9 t\u1ef1 n\u00e0o. N\u00f3 ghi l\u1ea1i t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong b\u1ed1i c\u1ea3nh m\u1ed9t s\u1ef1 h\u1ee3p t\u00e1c. \u0110\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 s\u1ef1 t\u1eadp trung v\u00e0o<strong>th\u1eddi gian<\/strong>.<\/p>\n<p id=\"BnmSsmA\"><img fetchpriority=\"high\" alt=\"Understanding The Dynamic View: UML Sequence Diagrams | Visual Paradigm\" class=\"alignnone wp-image-2339 size-full\" decoding=\"async\" fetchpriority=\"high\" height=\"572\" sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aaf73773e.png\" srcset=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aaf73773e.png 1024w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aaf73773e-300x168.png 300w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aaf73773e-768x429.png 768w\" width=\"1024\"\/><\/p>\n<p><a href=\"https:\/\/www.visual-paradigm.com\/learning\/handbooks\/software-design-handbook\/sequence-diagram.jsp\">S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/a>l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a c\u1ea5u tr\u00fac UML r\u1ed9ng l\u1edbn, c\u1ee5 th\u1ec3 n\u1eb1m trong nh\u00f3m s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c. Ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3:<\/p>\n<ul>\n<li>\n<p>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c c\u1ea5p cao gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ee7 \u0111\u1ed9ng trong h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p>Chi ti\u1ebft t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng trong m\u1ed9t s\u1ef1 h\u1ee3p t\u00e1c nh\u1eb1m th\u1ef1c hi\u1ec7n m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng.<\/p>\n<\/li>\n<li>\n<p>Tr\u1ef1c quan h\u00f3a vi\u1ec7c trao \u0111\u1ed5i tin nh\u1eafn gi\u1eefa c\u00e1c h\u1ec7 th\u1ed1ng con ho\u1eb7c c\u00e1c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i.<\/p>\n<\/li>\n<\/ul>\n<p><img alt=\"Sequence Diagram in UML Diagram Hierarchy\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/sequence-diagram-in-uml-diagram-hierarchy.png\"\/><\/p>\n<h3>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/h3>\n<ol>\n<li>\n<p><strong>T\u1eadp trung v\u00e0o th\u1eddi gian:<\/strong>Tr\u1ee5c \u0111\u1ee9ng \u0111\u1ea1i di\u1ec7n cho th\u1eddi gian ti\u1ebfn d\u1ea7n xu\u1ed1ng d\u01b0\u1edbi.<\/p>\n<\/li>\n<li>\n<p><strong>H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>Tr\u1ee5c ngang li\u1ec7t k\u00ea c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c ng\u01b0\u1eddi tham gia trong t\u01b0\u01a1ng t\u00e1c.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9ng:<\/strong>Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp t\u0129nh, s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 m\u00f4 t\u1ea3 c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng h\u1ee3p t\u00e1c trong qu\u00e1 tr\u00ecnh th\u1ef1c thi.<\/p>\n<\/li>\n<\/ol>\n<hr\/>\n<h2>S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 nh\u00ecn t\u1ed5ng quan<\/h2>\n<p>Hi\u1ec3u r\u00f5 hai chi\u1ec1u ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ecdc v\u00e0 t\u1ea1o ra ch\u00fang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<h3>1. Chi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng (tr\u1ee5c ngang)<\/h3>\n<p>Tr\u1ee5c ngang hi\u1ec3n th\u1ecb c\u00e1c th\u00e0nh ph\u1ea7n tham gia v\u00e0o t\u01b0\u01a1ng t\u00e1c. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea t\u1eeb tr\u00e1i sang ph\u1ea3i d\u1ef1a tr\u00ean th\u1eddi \u0111i\u1ec3m ch\u00fang tham gia chu\u1ed7i tin nh\u1eafn l\u1ea7n \u0111\u1ea7u ti\u00ean, m\u1eb7c d\u00f9 th\u1ee9 t\u1ef1 n\u00e0y c\u00f3 th\u1ec3 thay \u0111\u1ed5i. M\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t\u00a0<strong>D\u00e2y s\u1ed1ng<\/strong>.<\/p>\n<h3>2. Chi\u1ec1u th\u1eddi gian (tr\u1ee5c d\u1ecdc)<\/h3>\n<p>Tr\u1ee5c d\u1ecdc \u0111\u1ea1i di\u1ec7n cho s\u1ef1 ti\u1ebfn tri\u1ec3n c\u1ee7a th\u1eddi gian. Khi b\u1ea1n di chuy\u1ec3n xu\u1ed1ng s\u01a1 \u0111\u1ed3, th\u1eddi gian s\u1ebd tr\u00f4i v\u1ec1 ph\u00eda tr\u01b0\u1edbc.<\/p>\n<blockquote>\n<p><strong>Ghi ch\u00fa:<\/strong>\u00a0Th\u1eddi gian trong s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 li\u00ean quan \u0111\u1ebfn\u00a0<strong>th\u1ee9 t\u1ef1<\/strong>, kh\u00f4ng ph\u1ea3i kho\u1ea3ng th\u1eddi gian. Kho\u1ea3ng c\u00e1ch d\u1ecdc gi\u1eefa c\u00e1c tin nh\u1eafn kh\u00f4ng nh\u1ea5t thi\u1ebft t\u01b0\u01a1ng \u1ee9ng v\u1edbi gi\u00e2y ho\u1eb7c mili gi\u00e2y th\u1ef1c t\u1ebf; n\u00f3 ch\u1ec9 \u0111\u01a1n gi\u1ea3n cho th\u1ea5y m\u1ed9t s\u1ef1 ki\u1ec7n x\u1ea3y ra sau s\u1ef1 ki\u1ec7n kh\u00e1c.<\/p>\n<\/blockquote>\n<hr\/>\n<h2>C\u00e1c k\u00fd hi\u1ec7u v\u00e0 th\u00e0nh ph\u1ea7n ch\u00ednh<\/h2>\n<p>\u0110\u1ec3 x\u00e2y d\u1ef1ng s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1, b\u1ea1n c\u1ea7n hi\u1ec3u c\u00e1c k\u00fd hi\u1ec7u chu\u1ea9n UML. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c k\u00fd hi\u1ec7u thi\u1ebft y\u1ebfu.<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">K\u00fd hi\u1ec7u<\/th>\n<th align=\"left\">M\u00f4 t\u1ea3<\/th>\n<th align=\"left\">Bi\u1ec3u di\u1ec5n tr\u1ef1c quan<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\"><strong>Ng\u01b0\u1eddi di\u1ec5n vi\u00ean<\/strong><\/td>\n<td align=\"left\">\u0110\u1ea1i di\u1ec7n cho m\u1ed9t vai tr\u00f2 do ng\u01b0\u1eddi d\u00f9ng, ph\u1ea7n c\u1ee9ng b\u00ean ngo\u00e0i ho\u1eb7c h\u1ec7 th\u1ed1ng kh\u00e1c th\u1ef1c hi\u1ec7n. Ng\u01b0\u1eddi di\u1ec5n vi\u00ean n\u1eb1m ngo\u00e0i h\u1ec7 th\u1ed1ng \u0111ang \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a.<\/td>\n<td align=\"left\"><img alt=\"Actor\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/02-actor.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>D\u00e2y s\u1ed1ng<\/strong><\/td>\n<td align=\"left\">M\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u00e0nh ph\u1ea7n ri\u00eang l\u1ebb (\u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c ng\u01b0\u1eddi di\u1ec5n vi\u00ean) trong t\u01b0\u01a1ng t\u00e1c.<\/td>\n<td align=\"left\"><img alt=\"Lifeline\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/03-lifeline.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>K\u00edch ho\u1ea1t (t\u1eadp trung ki\u1ec3m so\u00e1t)<\/strong><\/td>\n<td align=\"left\">M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt m\u1ecfng tr\u00ean d\u00e2y s\u1ed1ng cho th\u1ea5y kho\u1ea3ng th\u1eddi gian m\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n \u0111ang th\u1ef1c hi\u1ec7n m\u1ed9t thao t\u00e1c. Ph\u1ea7n tr\u00ean tr\u00f9ng v\u1edbi th\u1eddi \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u, ph\u1ea7n d\u01b0\u1edbi tr\u00f9ng v\u1edbi th\u1eddi \u0111i\u1ec3m ho\u00e0n th\u00e0nh.<\/td>\n<td align=\"left\"><img alt=\"Activation\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/04-activation.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Tin nh\u1eafn g\u1ecdi<\/strong><\/td>\n<td align=\"left\">M\u1ed9t m\u0169i t\u00ean li\u1ec1n c\u00f3 \u0111\u1ea7u \u0111\u1ea7y, \u0111\u1ea1i di\u1ec7n cho vi\u1ec7c g\u1ecdi m\u1ed9t thao t\u00e1c tr\u00ean d\u00e2y s\u1ed1ng \u0111\u00edch.<\/td>\n<td align=\"left\"><img alt=\"Call Message\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/05-call-message.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Tin nh\u1eafn tr\u1ea3 v\u1ec1<\/strong><\/td>\n<td align=\"left\">M\u1ed9t m\u0169i t\u00ean \u0111\u1ee9t \u0111o\u1ea1n c\u00f3 \u0111\u1ea7u h\u1edf, \u0111\u1ea1i di\u1ec7n cho th\u00f4ng tin \u0111\u01b0\u1ee3c tr\u1ea3 l\u1ea1i cho ng\u01b0\u1eddi g\u1ecdi.<\/td>\n<td align=\"left\"><img alt=\"Return Message\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/06-return-message.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Tin nh\u1eafn t\u1ef1 th\u00e2n<\/strong><\/td>\n<td align=\"left\">M\u1ed9t tin nh\u1eafn m\u00e0 ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn l\u00e0 c\u00f9ng m\u1ed9t d\u00e2y s\u1ed1ng, th\u01b0\u1eddng cho th\u1ea5y x\u1eed l\u00fd n\u1ed9i b\u1ed9.<\/td>\n<td align=\"left\"><img alt=\"Self-Message\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/07-self-message.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Tin nh\u1eafn T\u1ea1o<\/strong><\/td>\n<td align=\"left\">M\u1ed9t m\u0169i t\u00ean g\u1ea1ch n\u1ed1i ch\u1ec9 v\u00e0o \u0111\u1ea7u c\u1ee7a m\u1ed9t \u0111\u01b0\u1eddng s\u1ed1ng m\u1edbi, cho th\u1ea5y vi\u1ec7c kh\u1edfi t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng.<\/td>\n<td align=\"left\"><img alt=\"Create Message\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/09-create-message.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Tin nh\u1eafn H\u1ee7y<\/strong><\/td>\n<td align=\"left\">M\u1ed9t m\u0169i t\u00ean k\u1ebft th\u00fac b\u1eb1ng m\u1ed9t d\u1ea5u \u201cX\u201d l\u1edbn tr\u00ean \u0111\u01b0\u1eddng s\u1ed1ng \u0111\u00edch, cho th\u1ea5y \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang b\u1ecb h\u1ee7y.<\/td>\n<td align=\"left\"><img alt=\"Destroy Message\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/10-destroy-message.png\"\/><\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>Ghi ch\u00fa<\/strong><\/td>\n<td align=\"left\">M\u1ed9t h\u1ed9p ch\u00fa th\u00edch \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u1ec3 cung c\u1ea5p th\u00eam ng\u1eef c\u1ea3nh m\u00e0 kh\u00f4ng mang \u00fd ngh\u0129a ng\u1eef ngh\u0129a.<\/td>\n<td align=\"left\"><img alt=\"Note\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/12-note.png\"\/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Tin nh\u1eafn v\u00e0 T\u1eadp trung v\u00e0o \u0110i\u1ec1u khi\u1ec3n<\/h3>\n<p>M\u1ed9t\u00a0<strong>S\u1ef1 ki\u1ec7n<\/strong>\u00a0l\u00e0 b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o trong t\u01b0\u01a1ng t\u00e1c khi m\u1ed9t \u0111i\u1ec1u g\u00ec \u0111\u00f3 x\u1ea3y ra.\u00a0<strong>T\u1eadp trung v\u00e0o \u0110i\u1ec1u khi\u1ec3n<\/strong>\u00a0(hay S\u1ef1 ki\u1ec7n Th\u1ef1c thi) \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n tr\u1ef1c quan b\u1eb1ng thanh k\u00edch ho\u1ea1t. N\u00f3 l\u00e0m n\u1ed5i b\u1eadt ch\u00ednh x\u00e1c th\u1eddi \u0111i\u1ec3m \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang b\u1eadn th\u1ef1c hi\u1ec7n m\u1ed9t t\u00e1c v\u1ee5.<\/p>\n<p><img alt=\"Message and Focus of Control\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/13-message-and-focus-of-control.png\"\/><\/p>\n<hr\/>\n<h2>C\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u1edbi PlantUML<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c v\u00ed d\u1ee5 to\u00e0n di\u1ec7n minh h\u1ecda c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00e1c nhau b\u1eb1ng c\u00fa ph\u00e1p PlantUML.<\/p>\n<h3>V\u00ed d\u1ee5 1: H\u1ec7 th\u1ed1ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n c\u01a1 b\u1ea3n<\/h3>\n<p>V\u00ed d\u1ee5 n\u00e0y ph\u1ea3n \u00e1nh t\u00ecnh hu\u1ed1ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n kinh \u0111i\u1ec3n, cho th\u1ea5y s\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, h\u1ec7 th\u1ed1ng \u0111\u1eb7t ph\u00f2ng v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n<p id=\"ZMfzgwS\"><img alt=\"\" class=\"alignnone size-full wp-image-2336\" decoding=\"async\" height=\"871\" sizes=\"(max-width: 1918px) 100vw, 1918px\" src=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7.png\" srcset=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7.png 1918w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7-300x136.png 300w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7-1024x465.png 1024w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7-768x349.png 768w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75a9d3ca2b7-1536x698.png 1536w\" width=\"1918\"\/><\/p>\n<div class=\"vpascode-viewer-container vpascode-fancy-active\">\n<div class=\"vpascode-header\">\n<span class=\"vpascode-lang-label\">Plantuml<\/span><br \/>\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLDBQiCm4DqRV8V1Yv92Se4iGfgu7wzAu-O0YZnfH6N9IEC4txuZVq2cq7Gtijvldl3Mat3KrZfDI956UBE46WxeqLq5AMkWx3nX3IlO2Qyal6XxIvCq4PAiW-orHKyP20_zb2ODwocf6c48ibZdMFImO_47Pl3gSSEO9fKWSH8U8HkYvUEv1-Mx4ALtXjM6jM4DpuRGpJR8aOJIli-i-1ls8HZCb76xDUmlAB_XwSf8SL9QKRTWQ_HBSDRMdrs3Zv70b6ugPyDHMEIZHTV1WGapfOWO4ZDq5LiVa5fd9WO_GX3Wk1NEQ9FNj6YkVAD55_7Ucx3ld3ab3UioS-Xg3UN5teQW-ujL4ltl8alKA6a0FS3UchDozPqI7OQRgFn5QA_8b_0Lj0jpjl-eiHJNcGZFqhhgJerZme5Hv7VxYmr6BbR_wMugFZQSyK8pQR95K_6VzGC0\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 8px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<div class=\"vpascode-code-wrapper\">\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Plantuml<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLEzQi907Dy3UOS_6Oe5VO4EHLHGKRhKGjSp1dCqNa9oaJgM3XrAeU83j2AEfHyK2idG8U9xt9lqVwU1n3RLCSdzlY_LW1EVXoD7rpZbZWKj4Ty1jqKyPKDOJKNqnS6pamzykhAJkMb38A8vWmfqGn7FyBMvdaDVH0kcQxf6JExwO7JKKGD80CtG2hYkUIX3JUeHni5eKkB2WA8Kosien4LxvtYn9tN-V19mQwHh0y99dmGM67Mq58Zu2GOYVWL72eKv-mhNg4d7oXzKJb4MJk3C5j6B1wPDWLCHVVEydWf8nuHRoYL24BZHHt07XMv7m7s2OjY8b5-YvH8R9i-JCZWkQjCjrN66AqsmPKBEHWtvUduuWR68bYpFzykBJ8A8IjPCpvU8iOXlmCJWwOZSLpLYMrOEdagdHRHa5gPQlzyGE29-9zYCY1_oVd9SQHHP3N9jsjrBboRQdQEU_Gn7S2cHJ6x4_f-YXqsx-UrAlkkEseqocaW-PHEKRU_40LDqrsyXe9aP17YtYkx4Npkq6t2TTRsdzzLZzfTRJPD58VoGgekmiZ9TgrfiWF_-3m00\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-plantuml\"><code class=\"language-plantuml\" data-language=\"plantuml\" class=\"language-plantuml\">@startuml\r\ntitle H\u1ec7 th\u1ed1ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n - Lu\u1ed3ng c\u01a1 b\u1ea3n\r\n\r\nactor \"Kh\u00e1ch\" as Guest\r\nparticipant \"Giao di\u1ec7n \u0111\u1eb7t ph\u00f2ng\" as UI\r\nparticipant \"H\u1ec7 th\u1ed1ng \u0111\u1eb7t ph\u00f2ng\" as System\r\ndatabase \"C\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1ch s\u1ea1n\" as DB\r\n\r\nGuest -&gt; UI : Nh\u1eadp chi ti\u1ebft \u0111\u1eb7t ph\u00f2ng\r\nactivate UI\r\nUI -&gt; System : Ki\u1ec3m tra kh\u1ea3 d\u1ee5ng (ng\u00e0y, lo\u1ea1i ph\u00f2ng)\r\nactivate System\r\nSystem -&gt; DB : Truy v\u1ea5n kh\u1ea3 d\u1ee5ng ph\u00f2ng\r\nactivate DB\r\nDB --&gt; System : Tr\u1ea3 v\u1ec1 c\u00e1c ph\u00f2ng tr\u1ed1ng\r\ndeactivate DB\r\nSystem --&gt; UI : Hi\u1ec3n th\u1ecb c\u00e1c l\u1ef1a ch\u1ecdn kh\u1ea3 d\u1ee5ng\r\ndeactivate System\r\nUI --&gt; Guest : Hi\u1ec3n th\u1ecb c\u00e1c l\u1ef1a ch\u1ecdn ph\u00f2ng\r\n\r\nGuest -&gt; UI : Ch\u1ecdn ph\u00f2ng &amp; X\u00e1c nh\u1eadn\r\nactivate UI\r\nUI -&gt; System : T\u1ea1o \u0111\u1eb7t ph\u00f2ng(roomID, th\u00f4ng tin kh\u00e1ch)\r\nactivate System\r\nSystem -&gt; DB : L\u01b0u h\u1ed3 s\u01a1 \u0111\u1eb7t ph\u00f2ng\r\nactivate DB\r\nDB --&gt; System : ID x\u00e1c nh\u1eadn\r\ndeactivate DB\r\nSystem --&gt; UI : \u0110\u1eb7t ph\u00f2ng \u0111\u00e3 x\u00e1c nh\u1eadn\r\ndeactivate System\r\nUI --&gt; Guest : Hi\u1ec3n th\u1ecb x\u00e1c nh\u1eadn\r\ndeactivate UI\r\n\r\n@enduml\r\n<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLEzQi907Dy3UOS_6Oe5VO4EHLHGKRhKGjSp1dCqNa9oaJgM3XrAeU83j2AEfHyK2idG8U9xt9lqVwU1n3RLCSdzlY_LW1EVXoD7rpZbZWKj4Ty1jqKyPKDOJKNqnS6pamzykhAJkMb38A8vWmfqGn7FyBMvdaDVH0kcQxf6JExwO7JKKGD80CtG2hYkUIX3JUeHni5eKkB2WA8Kosien4LxvtYn9tN-V19mQwHh0y99dmGM67Mq58Zu2GOYVWL72eKv-mhNg4d7oXzKJb4MJk3C5j6B1wPDWLCHVVEydWf8nuHRoYL24BZHHt07XMv7m7s2OjY8b5-YvH8R9i-JCZWkQjCjrN66AqsmPKBEHWtvUduuWR68bYpFzykBJ8A8IjPCpvU8iOXlmCJWwOZSLpLYMrOEdagdHRHa5gPQlzyGE29-9zYCY1_oVd9SQHHP3N9jsjrBboRQdQEU_Gn7S2cHJ6x4_f-YXqsx-UrAlkkEseqocaW-PHEKRU_40LDqrsyXe9aP17YtYkx4Npkq6t2TTRsdzzLZzfTRJPD58VoGgekmiZ9TgrfiWF_-3m00\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<\/p><\/div>\n<div class=\"vpascode-actions\">\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLDBQiCm4DqRV8V1Yv92Se4iGfgu7wzAu-O0YZnfH6N9IEC4txuZVq2cq7Gtijvldl3Mat3KrZfDI956UBE46WxeqLq5AMkWx3nX3IlO2Qyal6XxIvCq4PAiW-orHKyP20_zb2ODwocf6c48ibZdMFImO_47Pl3gSSEO9fKWSH8U8HkYvUEv1-Mx4ALtXjM6jM4DpuRGpJR8aOJIli-i-1ls8HZCb76xDUmlAB_XwSf8SL9QKRTWQ_HBSDRMdrs3Zv70b6ugPyDHMEIZHTV1WGapfOWO4ZDq5LiVa5fd9WO_GX3Wk1NEQ9FNj6YkVAD55_7Ucx3ld3ab3UioS-Xg3UN5teQW-ujL4ltl8alKA6a0FS3UchDozPqI7OQRgFn5QA_8b_0Lj0jpjl-eiHJNcGZFqhhgJerZme5Hv7VxYmr6BbR_wMugFZQSyK8pQR95K_6VzGC0\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 6px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<\/div>\n<h3>V\u00ed d\u1ee5 2: Logic n\u00e2ng cao v\u1edbi c\u00e1c \u0111o\u1ea1n k\u1ebft h\u1ee3p<\/h3>\n<p>C\u00e1c h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf bao g\u1ed3m c\u00e1c \u0111i\u1ec1u ki\u1ec7n, v\u00f2ng l\u1eb7p v\u00e0 c\u00e1c b\u01b0\u1edbc t\u00f9y ch\u1ecdn. UML 2.0 \u0111\u00e3 gi\u1edbi thi\u1ec7u\u00a0<strong>C\u00e1c \u0111o\u1ea1n k\u1ebft h\u1ee3p<\/strong>\u00a0\u0111\u1ec3 x\u1eed l\u00fd nh\u1eefng \u0111\u1ed9 ph\u1ee9c t\u1ea1p n\u00e0y.<\/p>\n<p><strong>C\u00e1c to\u00e1n t\u1eed \u0111o\u1ea1n ph\u1ed5 bi\u1ebfn:<\/strong><\/p>\n<ul>\n<li>\n<p><strong>alt<\/strong>: C\u00e1c nh\u00e1nh thay th\u1ebf (n\u1ebfu\/ho\u1eb7c).<\/p>\n<\/li>\n<li>\n<p><strong>opt<\/strong>: Nh\u00e1nh t\u00f9y ch\u1ecdn (n\u1ebfu).<\/p>\n<\/li>\n<li>\n<p><strong>loop<\/strong>: Th\u1ef1c thi l\u1eb7p l\u1ea1i.<\/p>\n<\/li>\n<li>\n<p><strong>ref<\/strong>: Tham chi\u1ebfu \u0111\u1ebfn s\u01a1 \u0111\u1ed3 kh\u00e1c.<\/p>\n<\/li>\n<\/ul>\n<p id=\"kldTdxn\"><img alt=\"\" class=\"alignnone size-full wp-image-2337\" decoding=\"async\" height=\"871\" sizes=\"(max-width: 1912px) 100vw, 1912px\" src=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d.png\" srcset=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d.png 1912w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d-300x137.png 300w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d-1024x466.png 1024w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d-768x350.png 768w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa333930d-1536x700.png 1536w\" width=\"1912\"\/><\/p>\n<div class=\"vpascode-viewer-container vpascode-fancy-active\">\n<div class=\"vpascode-header\">\n<span class=\"vpascode-lang-label\">Plantuml<\/span><br \/>\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:VLHBRzim3BuRy7yWV5g1zjHR3aFpAbQW1OfcwvsHk5Y8B1aIdQp_VhIK9evhD1SduiVlGT5vY8o1kyQM1Hks17yY1NZsE-FWQBY6TGW-m2zqsXgt0tbArRUnBCe25Kkjwbigm9Xwow8LGgDCYuwXoaolkAE4wB-C4FDEL3OK3aPbJ7zG5XePjnWfqyDgaMghHQ-RJkv-9ZQOmTgn_5u6qkJOe8t9cJaWqqam0QKXQStW7QqHVlhH2P73XcwXnHYFFkYRGMys8WUMSykr1iWd4GhnQY6qZyIgpWDy3VwliPH1PyBUVNyWwBkBcvnFukQYfY_uh789d8UwwPIY6E6ttvFBm9nJW8bp1c-aJI35m5uKOhtr67HPa9MvFhd3Tva6uqqRy29IQPPJEYiJMuiVK7sI9eULA3dTJt2GwNIxDBgXil0jYz-6cYtrQh2iIUr9Py7HZQSQL0DuDJHs7kr6zfDakM8qti7I-xsXwP2v9b0-cxQovl22_-0UvipKj1mdpRmHXu-SEDUtWN0FSwLy9ml-x2yn9YpcA8yesw97EbC-hrab878Nn-INYzdK_YYls5NJQLGfvIdgWppbF-0_\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 8px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<div class=\"vpascode-code-wrapper\">\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Plantuml<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLHDQzj04BqBz1y6dLfeJhtbKDBOXq3Jq8CBlQvbOIsMLq9QcVXOSiWX56fwwC6KsfXGMZ1Dsq28HCb1nlzZ_qbdTXL_o3BKO8GrysRUl3VZeqIoMARzmBOabu47Yu-B2z45uQji7e7eBczK_eL3fxZ7jmELZpcSgtmEGV4N0fL_vZ0e9lZzZU50PNUHRTaMSsKOWtEsXNQ09V0syMBRYh0dTtd4X0Id5JF4BaORVNNg6zRrAgbDbL-vFj6uXlDYweBqLVxBrUalK-dRLeT9rcQ91qvZEOL4vL-Xe_AV472LNwQLUJIkUKoCYHSSlD1DuH3EpFZIBswHbEHYcv-Ua0-Oz4gM6ePm8e7mTsjkJrAiB5ZVUmPzX4heOONlwTED4eOvlWWajFPq12msYqZnIzi2_EXEsB5vZFrELNOzf9HFaE3OsrEQ_5KtcfTU8F1WpRYvLoIJtV5s2XW6QyrU5xD7mTh5DApmnyX4-E1ItE2DPeZNsXz2mq-7AhyGu5FxiTu9bJq8QAjifdyXlVSf2iWfpRQy07tUArZF1EfrMxDkRJ3M-rnFxaJtr9vUWRDz93kT7EGcEcJfXcpbVdgLpR6jC4BRY_iXk5ZXWy2pmUSOP77B7Po9n9YvPT2GgonhOnUtESJAuzFbJGfk6FQu1v7FYny2htZIXm7PxjRBqp3fYn6Qk-8YqO7iGTAzqosKimPX645BvIEEcGoUK_YRaMnUoxj5aOfhY9cM5hHZZ_LGcGb7XKFQ0Tm4L1_b_iDCIisGhyYeFiYOqVMFIXBLNSHxaRHNZxrgDoF6EAsMNqmvolfVFFPjp9unIgEqWgMCH_Z4_-D_\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-plantuml\"><code class=\"language-plantuml\" data-language=\"plantuml\" class=\"language-plantuml\">@startuml\r\ntitle \u0110\u0103ng nh\u1eadp ng\u01b0\u1eddi d\u00f9ng v\u1edbi x\u1eed l\u00fd l\u1ed7i v\u00e0 v\u00f2ng l\u1eb7p\r\n\r\nactor \"Ng\u01b0\u1eddi d\u00f9ng\" as User\r\nparticipant \"Trang \u0111\u0103ng nh\u1eadp\" as Page\r\nparticipant \"D\u1ecbch v\u1ee5 x\u00e1c th\u1ef1c\" as Auth\r\ndatabase \"C\u01a1 s\u1edf d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng\" as DB\r\n\r\nUser -&gt; Page : Nh\u1eadp th\u00f4ng tin \u0111\u0103ng nh\u1eadp\r\nactivate Page\r\nPage -&gt; Auth : X\u00e1c th\u1ef1c(username, m\u1eadt kh\u1ea9u)\r\nactivate Auth\r\n\r\nalt Th\u00f4ng tin \u0111\u0103ng nh\u1eadp h\u1ee3p l\u1ec7\r\n    Auth -&gt; DB : L\u1ea5y h\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng\r\n    activate DB\r\n    DB --&gt; Auth : D\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng\r\n    deactivate DB\r\n    Auth --&gt; Page : M\u00e3 th\u00f4ng b\u00e1o \u0111\u0103ng nh\u1eadp th\u00e0nh c\u00f4ng\r\n    Page --&gt; User : Chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n\r\nelse Th\u00f4ng tin \u0111\u0103ng nh\u1eadp kh\u00f4ng h\u1ee3p l\u1ec7\r\n    Auth --&gt; Page : Th\u00f4ng b\u00e1o l\u1ed7i\r\n    Page --&gt; User : Hi\u1ec3n th\u1ecb \"\u0110\u0103ng nh\u1eadp kh\u00f4ng h\u1ee3p l\u1ec7\"\r\nend\r\n\r\ndeactivate Auth\r\ndeactivate Page\r\n\r\nopt T\u00f9y ch\u1ecdn \"Nh\u1edb t\u00f4i\" \u0111\u01b0\u1ee3c ch\u1ecdn\r\n    User -&gt; Page : Ch\u1ecdn \"Nh\u1edb t\u00f4i\"\r\n    Page -&gt; Auth : L\u01b0u cookie phi\u00ean l\u00e0m vi\u1ec7c\r\n    Auth --&gt; Page : Cookie \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp\r\nend\r\n\r\nloop T\u1ed1i \u0111a 3 l\u1ea7n th\u1eed\r\n    User -&gt; Page : Th\u1eed \u0111\u0103ng nh\u1eadp l\u1ea1i\r\n    break T\u00e0i kho\u1ea3n b\u1ecb kh\u00f3a\r\n        Page -&gt; Auth : Ki\u1ec3m tra s\u1ed1 l\u1ea7n \u0111\u0103ng nh\u1eadp th\u1ea5t b\u1ea1i\r\n        Auth --&gt; Page : Tr\u1ea1ng th\u00e1i t\u00e0i kho\u1ea3n b\u1ecb kh\u00f3a\r\n        Page --&gt; User : Hi\u1ec3n th\u1ecb \"T\u00e0i kho\u1ea3n b\u1ecb kh\u00f3a\"\r\n    end\r\nend\r\n\r\n@enduml\r\n<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:ZLHDQzj04BqBz1y6dLfeJhtbKDBOXq3Jq8CBlQvbOIsMLq9QcVXOSiWX56fwwC6KsfXGMZ1Dsq28HCb1nlzZ_qbdTXL_o3BKO8GrysRUl3VZeqIoMARzmBOabu47Yu-B2z45uQji7e7eBczK_eL3fxZ7jmELZpcSgtmEGV4N0fL_vZ0e9lZzZU50PNUHRTaMSsKOWtEsXNQ09V0syMBRYh0dTtd4X0Id5JF4BaORVNNg6zRrAgbDbL-vFj6uXlDYweBqLVxBrUalK-dRLeT9rcQ91qvZEOL4vL-Xe_AV472LNwQLUJIkUKoCYHSSlD1DuH3EpFZIBswHbEHYcv-Ua0-Oz4gM6ePm8e7mTsjkJrAiB5ZVUmPzX4heOONlwTED4eOvlWWajFPq12msYqZnIzi2_EXEsB5vZFrELNOzf9HFaE3OsrEQ_5KtcfTU8F1WpRYvLoIJtV5s2XW6QyrU5xD7mTh5DApmnyX4-E1ItE2DPeZNsXz2mq-7AhyGu5FxiTu9bJq8QAjifdyXlVSf2iWfpRQy07tUArZF1EfrMxDkRJ3M-rnFxaJtr9vUWRDz93kT7EGcEcJfXcpbVdgLpR6jC4BRY_iXk5ZXWy2pmUSOP77B7Po9n9YvPT2GgonhOnUtESJAuzFbJGfk6FQu1v7FYny2htZIXm7PxjRBqp3fYn6Qk-8YqO7iGTAzqosKimPX645BvIEEcGoUK_YRaMnUoxj5aOfhY9cM5hHZZ_LGcGb7XKFQ0Tm4L1_b_iDCIisGhyYeFiYOqVMFIXBLNSHxaRHNZxrgDoF6EAsMNqmvolfVFFPjp9unIgEqWgMCH_Z4_-D_\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<\/p><\/div>\n<div class=\"vpascode-actions\">\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:VLHBRzim3BuRy7yWV5g1zjHR3aFpAbQW1OfcwvsHk5Y8B1aIdQp_VhIK9evhD1SduiVlGT5vY8o1kyQM1Hks17yY1NZsE-FWQBY6TGW-m2zqsXgt0tbArRUnBCe25Kkjwbigm9Xwow8LGgDCYuwXoaolkAE4wB-C4FDEL3OK3aPbJ7zG5XePjnWfqyDgaMghHQ-RJkv-9ZQOmTgn_5u6qkJOe8t9cJaWqqam0QKXQStW7QqHVlhH2P73XcwXnHYFFkYRGMys8WUMSykr1iWd4GhnQY6qZyIgpWDy3VwliPH1PyBUVNyWwBkBcvnFukQYfY_uh789d8UwwPIY6E6ttvFBm9nJW8bp1c-aJI35m5uKOhtr67HPa9MvFhd3Tva6uqqRy29IQPPJEYiJMuiVK7sI9eULA3dTJt2GwNIxDBgXil0jYz-6cYtrQh2iIUr9Py7HZQSQL0DuDJHs7kr6zfDakM8qti7I-xsXwP2v9b0-cxQovl22_-0UvipKj1mdpRmHXu-SEDUtWN0FSwLy9ml-x2yn9YpcA8yesw97EbC-hrab878Nn-INYzdK_YYls5NJQLGfvIdgWppbF-0_\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 6px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<\/div>\n<h3>V\u00ed d\u1ee5 3: T\u1ea1o v\u00e0 h\u1ee7y \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n<p>V\u00ed d\u1ee5 n\u00e0y minh h\u1ecda v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng, t\u1eeb l\u00fac t\u1ea1o \u0111\u1ebfn l\u00fac h\u1ee7y.<\/p>\n<p id=\"XPXHiZo\"><img loading=\"lazy\" alt=\"\" class=\"alignnone size-full wp-image-2338\" decoding=\"async\" height=\"868\" loading=\"lazy\" sizes=\"auto, (max-width: 1915px) 100vw, 1915px\" src=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963.png\" srcset=\"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963.png 1915w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963-300x136.png 300w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963-1024x464.png 1024w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963-768x348.png 768w, https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aa77bd963-1536x696.png 1536w\" width=\"1915\"\/><\/p>\n<div class=\"vpascode-viewer-container vpascode-fancy-active\">\n<div class=\"vpascode-header\">\n<span class=\"vpascode-lang-label\">Plantuml<\/span><br \/>\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:XPB1ReCm38RlIBo3rHCxz0Lsc3fr6ghK3gG-GPeObYc4AZ6hsDFFQIZGYcaNP9pVdtyxsNWIZhh6f0bfCWY5K-YWTAr4xxMjOGt5wGibmLvNA7jfC4tIvCnLMkgpi0IhM7CGLjJeLY0y58SbIJmA4ICV1ANe6-GW5uGNqL-bPHvQsPOGdAu_2TgAoV0Cns3wPZ9eEBj-6T6is3fa47pW9MQpfpIHCJSP6FNhK1p0SPATvQrOYOlaLwLWHzZuJFDthpqnMaZIt__1hrMX7jL4BdC-6IQ1OGcPQDhEtd73AbWwicxhEdOoxa3XdNR1-BksmkWVd1Ror_pRrbRQDNERCyuRUd9j7m0gXhEf7ovhgXeUKIxSYLy9jp26_sEBcVU9j46h-5t-0W00\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 8px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<div class=\"vpascode-code-wrapper\">\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Plantuml<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:XPF1IiD054NtXVp3ewkww0-uaAABkh2qGX6tCHcJaMPIanUnI_47seKh4HfAAOYYYAiChYRqF-PFV5CaITE2go5mtptltfbqOhGZJ8AHrK2E8mQNMhx3IFr0Fbkd0dmr5nwquK9zqPdFj7pXcsF60TUVMYw4PpMinfXSkCF7ja1edYSwMuYwInFi6FgzcZQVrWIHowB-rKrDTgBb4os0lYrym52bOgCUT0rSXCWWufwF45uJ0WxXM6SVQ1RDLWdS9Ye5ZDIRy8sS1EsZ0aJYeSxI42gRGA3bCsyTM0qdOZQPbriLOstZyOUYiEXh-LYDkv_agzV0k2-T5aSMdF4OYM8xoE_-u_JC517Kmc1CzGvHoQya3RgaAswmKbOhfXi3v5e-Y2hFz4T31MDOZXZlENquwjk4STdMq9vifo7f0NMsn6eFfiNTCDMoDv7kLUg0y7NsBlQxQxcQ62-NnHY5aqfLjUilP_BfrZlTwIu1BmmW8h91LXAMtXqcNFexVW40\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-plantuml\"><code class=\"language-plantuml\" data-language=\"plantuml\" class=\"language-plantuml\">@startuml\r\ntitle X\u1eed l\u00fd \u0111\u01a1n h\u00e0ng - V\u00f2ng \u0111\u1eddi \u0111\u1ed1i t\u01b0\u1ee3ng\r\n\r\nparticipant \"Qu\u1ea3n l\u00fd \u0111\u01a1n h\u00e0ng\" as OM\r\nparticipant \"\u0110\u01a1n h\u00e0ng\" as OrderObj\r\nparticipant \"C\u1ed5ng thanh to\u00e1n\" as PG\r\n\r\nnote right of OM : B\u1eaft \u0111\u1ea7u qu\u00e1 tr\u00ecnh\r\n\r\nOM -&gt; OrderObj : T\u1ea1o \u0110\u01a1n h\u00e0ng m\u1edbi()\r\ncreate OrderObj\r\nOrderObj --&gt; OM : B\u1ea3n th\u1ec3 \u0111\u01a1n h\u00e0ng\r\n\r\nOM -&gt; OrderObj : Th\u00eam m\u1ee5c(itemList)\r\nactivate OrderObj\r\nOrderObj --&gt; OM : M\u1ee5c \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam\r\n\r\nOM -&gt; PG : X\u1eed l\u00fd thanh to\u00e1n(s\u1ed1 ti\u1ec1n)\r\nactivate PG\r\nPG --&gt; OM : Thanh to\u00e1n th\u00e0nh c\u00f4ng\r\ndeactivate PG\r\n\r\nOM -&gt; OrderObj : Ho\u00e0n t\u1ea5t \u0111\u01a1n h\u00e0ng()\r\nOrderObj --&gt; OM : \u0110\u01a1n h\u00e0ng \u0111\u00e3 x\u00e1c nh\u1eadn\r\n\r\nOM -&gt; OrderObj : H\u1ee7y()\r\ndestroy OrderObj\r\nnote right of OrderObj : \u0110\u1ed1i t\u01b0\u1ee3ng \u0111\u00e3 \u0111\u01b0\u1ee3c thu gom r\u00e1c\r\n\r\ndeactivate OrderObj\r\n@enduml\r\n<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:XPF1IiD054NtXVp3ewkww0-uaAABkh2qGX6tCHcJaMPIanUnI_47seKh4HfAAOYYYAiChYRqF-PFV5CaITE2go5mtptltfbqOhGZJ8AHrK2E8mQNMhx3IFr0Fbkd0dmr5nwquK9zqPdFj7pXcsF60TUVMYw4PpMinfXSkCF7ja1edYSwMuYwInFi6FgzcZQVrWIHowB-rKrDTgBb4os0lYrym52bOgCUT0rSXCWWufwF45uJ0WxXM6SVQ1RDLWdS9Ye5ZDIRy8sS1EsZ0aJYeSxI42gRGA3bCsyTM0qdOZQPbriLOstZyOUYiEXh-LYDkv_agzV0k2-T5aSMdF4OYM8xoE_-u_JC517Kmc1CzGvHoQya3RgaAswmKbOhfXi3v5e-Y2hFz4T31MDOZXZlENquwjk4STdMq9vifo7f0NMsn6eFfiNTCDMoDv7kLUg0y7NsBlQxQxcQ62-NnHY5aqfLjUilP_BfrZlTwIu1BmmW8h91LXAMtXqcNFexVW40\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Plantuml in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<\/p><\/div>\n<div class=\"vpascode-actions\">\n<a class=\"vpascode-fancy-btn\" href=\"https:\/\/www.vpascode.com\/editor\/#plantuml:XPB1ReCm38RlIBo3rHCxz0Lsc3fr6ghK3gG-GPeObYc4AZ6hsDFFQIZGYcaNP9pVdtyxsNWIZhh6f0bfCWY5K-YWTAr4xxMjOGt5wGibmLvNA7jfC4tIvCnLMkgpi0IhM7CGLjJeLY0y58SbIJmA4ICV1ANe6-GW5uGNqL-bPHvQsPOGdAu_2TgAoV0Cns3wPZ9eEBj-6T6is3fa47pW9MQpfpIHCJSP6FNhK1p0SPATvQrOYOlaLwLWHzZuJFDthpqnMaZIt__1hrMX7jL4BdC-6IQ1OGcPQDhEtd73AbWwicxhEdOoxa3XdNR1-BksmkWVd1Ror_pRrbRQDNERCyuRUd9j7m0gXhEf7ovhgXeUKIxSYLy9jp26_sEBcVU9j46h-5t-0W00\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<svg fill=\"none\" height=\"14\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2.5\" style=\"margin-right: 6px;\" viewbox=\"0 0 24 24\" width=\"14\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg><br \/>\n<span>Ch\u1ec9nh s\u1eeda Plantuml trong VPasCode<\/span><br \/>\n<\/a>\n<\/div>\n<\/div>\n<hr\/>\n<h2>Ph\u00e2n t\u00edch s\u00e2u v\u1ec1 c\u00e1c m\u1ea3nh tu\u1ea7n t\u1ef1<\/h2>\n<p><a href=\"https:\/\/www.visual-paradigm.com\/guide\/mastering-uml-sequence-diagrams-a-comprehensive-guide-from-basic-notation-to-advanced-decomposition\/\">C\u00e1c m\u1ea3nh tu\u1ea7n t\u1ef1<\/a> cho ph\u00e9p b\u1ea1n m\u00f4 h\u00ecnh h\u00f3a logic ph\u1ee9c t\u1ea1p m\u00e0 kh\u00f4ng l\u00e0m r\u1ed1i d\u00f2ng ch\u00ednh. M\u1ed9t m\u1ea3nh \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t khung (h\u1ed9p) bao quanh m\u1ed9t ph\u1ea7n t\u01b0\u01a1ng t\u00e1c.<\/p>\n<p><img alt=\"Fragment\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/14-fragment.png\"\/><\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">To\u00e1n t\u1eed<\/th>\n<th align=\"left\">Lo\u1ea1i m\u1ea3nh<\/th>\n<th align=\"left\">M\u00f4 t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\"><strong>alt<\/strong><\/td>\n<td align=\"left\">Thay th\u1ebf<\/td>\n<td align=\"left\">Nhi\u1ec1u m\u1ea3nh trong \u0111\u00f3 ch\u1ec9 m\u1ed9t m\u1ea3nh \u0111\u01b0\u1ee3c th\u1ef1c thi d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n (gi\u1ed1ng nh\u01b0 if-else).<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>opt<\/strong><\/td>\n<td align=\"left\">T\u00f9y ch\u1ecdn<\/td>\n<td align=\"left\">Ch\u1ec9 th\u1ef1c thi n\u1ebfu \u0111i\u1ec1u ki\u1ec7n \u0111\u00fang (gi\u1ed1ng nh\u01b0 m\u1ed9t c\u00e2u l\u1ec7nh if \u0111\u01a1n gi\u1ea3n).<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>par<\/strong><\/td>\n<td align=\"left\">Song song<\/td>\n<td align=\"left\">C\u00e1c m\u1ea3nh ch\u1ea1y \u0111\u1ed3ng th\u1eddi.<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>loop<\/strong><\/td>\n<td align=\"left\">V\u00f2ng l\u1eb7p<\/td>\n<td align=\"left\">Th\u1ef1c thi nhi\u1ec1u l\u1ea7n d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7.<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>break<\/strong><\/td>\n<td align=\"left\">Break<\/td>\n<td align=\"left\">Tho\u00e1t kh\u1ecfi t\u01b0\u01a1ng t\u00e1c xung quanh n\u1ebfu \u0111i\u1ec1u ki\u1ec7n \u0111\u01b0\u1ee3c th\u1ecfa m\u00e3n (x\u1eed l\u00fd ngo\u1ea1i l\u1ec7).<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><strong>ref<\/strong><\/td>\n<td align=\"left\">Tham chi\u1ebfu<\/td>\n<td align=\"left\">Tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t t\u01b0\u01a1ng t\u00e1c \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 kh\u00e1c nh\u1eb1m m\u1ee5c \u0111\u00edch t\u00ednh modular.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>V\u00ed d\u1ee5 v\u1ec1 Kh\u1ed1i K\u1ebft h\u1ee3p<\/h3>\n<p><img alt=\"Combined Fragment example\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/15-combined-fragment-example.png\"\/><\/p>\n<hr\/>\n<h2><a href=\"https:\/\/www.visual-paradigm.com\/support\/documents\/vpuserguide\/94\/2575\/83684_produceuseca.html\">M\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u00ecnh hu\u1ed1ng s\u1eed d\u1ee5ng<\/a><\/h2>\n<p><a href=\"https:\/\/www.visual-paradigm.com\/guide\/mastering-uml-sequence-diagrams-a-comprehensive-guide-from-basic-notation-to-advanced-decomposition\/\">S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/a> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong k\u1ef9 thu\u1eadt y\u00eau c\u1ea7u \u0111\u1ec3 tinh ch\u1ec9nh c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u00e0nh c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3.<\/p>\n<ul>\n<li>\n<p><strong>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng:<\/strong>\u00a0M\u1ed9t t\u1eadp h\u1ee3p c\u00e1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c t\u00e1c nh\u00e2n v\u00e0 h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00ecnh hu\u1ed1ng:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng \u0111i duy nh\u1ea5t qua m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng (v\u00ed d\u1ee5: \u201c\u0110\u01b0\u1eddng \u0111i h\u1ea1nh ph\u00fac\u201d ho\u1eb7c \u201c\u0110\u01b0\u1eddng \u0111i l\u1ed7i\u201d).<\/p>\n<\/li>\n<\/ul>\n<p><img alt=\"Sequence Diagram for Use Case\" decoding=\"async\" src=\"https:\/\/cdn-images.visual-paradigm.com\/guide\/uml\/what-is-sequence-diagram\/16-sequence-diagram-for-use-case.png\"\/><\/p>\n<p>B\u1eb1ng c\u00e1ch \u00e1nh x\u1ea1 m\u1ed7i t\u00ecnh hu\u1ed1ng v\u00e0o m\u1ed9t s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1, c\u00e1c \u0111\u1ed9i c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng \u0111\u1ec1u \u0111\u01b0\u1ee3c xem x\u00e9t tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u ph\u00e1t tri\u1ec3n.<\/p>\n<hr\/>\n<h2>T\u1ea1i sao m\u00f4 h\u00ecnh h\u00f3a tr\u01b0\u1edbc khi vi\u1ebft m\u00e3?<\/h2>\n<p>B\u1ea1n c\u00f3 th\u1ec3 th\u1eafc m\u1eafc,<em>\u201cT\u1ea1i sao v\u1ebd s\u01a1 \u0111\u1ed3 khi t\u00f4i c\u00f3 th\u1ec3 ch\u1ec9 vi\u1ebft m\u00e3?\u201d<\/em>\u00a0D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng l\u1ee3i \u00edch ch\u00ednh:<\/p>\n<ol>\n<li>\n<p><strong>Tr\u1eebu t\u01b0\u1ee3ng:<\/strong>\u00a0S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ho\u1ea1t \u0111\u1ed9ng \u1edf m\u1ee9c \u0111\u1ed9 cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi m\u00e3 ngu\u1ed3n, t\u1eadp trung v\u00e0o lu\u1ed3ng logic thay v\u00ec c\u00fa ph\u00e1p.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00ednh trung l\u1eadp ng\u00f4n ng\u1eef:<\/strong>\u00a0Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u b\u1edfi c\u00e1c b\u00ean li\u00ean quan b\u1ea5t k\u1ec3 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng (Java, Python, C#, v.v.).<\/p>\n<\/li>\n<li>\n<p><strong>H\u1ee3p t\u00e1c:<\/strong>\u00a0Nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng ph\u1ea3i l\u1eadp tr\u00ecnh vi\u00ean (Qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m, Nh\u00e0 ph\u00e2n t\u00edch kinh doanh) c\u00f3 th\u1ec3 \u0111\u00f3ng g\u00f3p v\u00e0 x\u00e1c nh\u1eadn logic.<\/p>\n<\/li>\n<li>\n<p><strong>Ki\u1ec3m th\u1eed &amp; UX:<\/strong>\u00a0Ch\u00fang \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf tuy\u1ec7t v\u1eddi cho c\u00e1c tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed v\u00e0 c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 thi\u1ebft k\u1ebf b\u1ed1 c\u1ee5c UX b\u1eb1ng c\u00e1ch l\u00e0m r\u00f5 ph\u1ea3n h\u1ed3i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<\/ol>\n<hr\/>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p><a href=\"https:\/\/guides.visual-paradigm.com\/understanding-sequence-diagram-notation-in-uml\/\">S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML<\/a> l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u1ec3 tr\u1ef1c quan h\u00f3a <a href=\"https:\/\/www.visual-paradigm.com\/guide\/sysml\/modeling-scenarios-with-sequence-diagram\/\">h\u00e0nh vi \u0111\u1ed9ng c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng<\/a>. B\u1eb1ng c\u00e1ch th\u00e0nh th\u1ea1o c\u00e1c k\u00fd hi\u1ec7u\u2014\u0111\u01b0\u1eddng s\u1ed1ng, k\u00edch ho\u1ea1t, tin nh\u1eafn v\u00e0 c\u00e1c \u0111o\u1ea1n k\u1ebft h\u1ee3p\u2014b\u1ea1n c\u00f3 th\u1ec3 truy\u1ec1n \u0111\u1ea1t r\u00f5 r\u00e0ng c\u00e1c t\u01b0\u01a1ng t\u00e1c ph\u1ee9c t\u1ea1p gi\u1eefa c\u00e1c th\u00e0nh vi\u00ean trong nh\u00f3m. D\u00f9 b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a lu\u1ed3ng \u0111\u0103ng nh\u1eadp \u0111\u01a1n gi\u1ea3n hay m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ph\u1ee9c t\u1ea1p, s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 s\u1ebd gi\u00fap n\u1ed1i li\u1ec1n kho\u1ea3ng c\u00e1ch gi\u1eefa y\u00eau c\u1ea7u v\u00e0 tri\u1ec3n khai.<\/p>\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng ai mu\u1ed1n t\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 chuy\u00ean nghi\u1ec7p m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng,\u00a0<a href=\"https:\/\/www.visual-paradigm.com\/features\/\"><strong>Visual Paradigm<\/strong>\u00a0cung c\u1ea5p m\u1ed9t b\u1ed9 c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a UML m\u1ea1nh m\u1ebd<\/a>. Phi\u00ean b\u1ea3n <a href=\"https:\/\/www.visual-paradigm.com\/solution\/freeumltool\/\">Community Edition<\/a> l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ea1t gi\u1ea3i th\u01b0\u1edfng qu\u1ed1c t\u1ebf, th\u00e2n thi\u1ec7n, d\u1ec5 s\u1eed d\u1ee5ng v\u00e0 ho\u00e0n to\u00e0n mi\u1ec5n ph\u00ed, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn tuy\u1ec7t v\u1eddi \u0111\u1ec3 h\u1ecdc t\u1eadp v\u00e0 luy\u1ec7n t\u1eadp UML nhanh h\u01a1n v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<p class=\"\"><a href=\"https:\/\/www.visual-paradigm.com\/download\/community.jsp\">T\u1ea3i mi\u1ec5n ph\u00ed phi\u00ean b\u1ea3n Community c\u1ee7a Visual Paradigm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1edbi thi\u1ec7u Trong th\u1ebf gi\u1edbi k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m v\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng, vi\u1ec7c hi\u1ec3u r\u00f5c\u00e1chc\u00e1c th\u00e0nh ph\u1ea7n t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng kh\u00f4ng k\u00e9m g\u00ec&hellip;<\/p>\n","protected":false},"author":2,"featured_media":2024,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","fifu_image_url":"https:\/\/www.ez-knowledge.com\/wp-content\/uploads\/2026\/08\/img_6a75aaf73773e.png","fifu_image_alt":"","footnotes":""},"categories":[57,50],"tags":[],"class_list":["post-2023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai","category-unified-modeling-language"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Th\u00e0nh th\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c \u0111\u1ed9ng - Ez Knowledge Vietnamese - Latest in AI &amp; 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