{"id":10866,"date":"2026-03-06T01:03:03","date_gmt":"2026-03-05T17:03:03","guid":{"rendered":"https:\/\/www.archimetric.com\/vn\/how-to-specify-visibility-in-uml-class-diagrams\/"},"modified":"2026-03-06T01:03:03","modified_gmt":"2026-03-05T17:03:03","slug":"how-to-specify-visibility-in-uml-class-diagrams","status":"publish","type":"post","link":"https:\/\/www.archimetric.com\/vn\/how-to-specify-visibility-in-uml-class-diagrams\/","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn trong s\u01a1 \u0111\u1ed3 l\u1edbp UML"},"content":{"rendered":"<h2 id=\"uml-class-notation\">K\u00fd hi\u1ec7u l\u1edbp UML<\/h2>\n<p>C\u00e1c l\u1edbp bi\u1ec3u di\u1ec5n kh\u00e1i ni\u1ec7m \u0111\u00f3ng g\u00f3i tr\u1ea1ng th\u00e1i (<b>thu\u1ed9c t\u00ednh<\/b>) v\u00e0 h\u00e0nh vi (<b>thao t\u00e1c<\/b>). M\u1ed7i thu\u1ed9c t\u00ednh c\u00f3 m\u1ed9t ki\u1ec3u. M\u1ed7i <b>thao t\u00e1c<\/b> c\u00f3 m\u1ed9t <b>k\u00fd hi\u1ec7u<\/b>. <i>T\u00ean l\u1edbp l\u00e0 th\u00f4ng tin <b>ch\u1ec9 c\u1ea7n thi\u1ebft<\/b><\/i>.<\/p>\n<p><img alt=\"UML Class Notation\" decoding=\"async\" src=\"https:\/\/www.archimetric.com\/wp-content\/uploads\/2022\/02\/02-class-notation.png\"\/><\/p>\n<p>\u0110\u00f3ng g\u00f3i l\u00e0 nguy\u00ean t\u1eafc che gi\u1ea5u d\u1eef li\u1ec7u: m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u1ea9n d\u1eef li\u1ec7u c\u1ee7a n\u00f3 kh\u1ecfi truy c\u1eadp b\u00ean ngo\u00e0i v\u00e0 ch\u1ec9 cho ph\u00e9p c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i thao t\u00e1c d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch g\u1ecdi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n<p>M\u1ee9c \u0111\u1ed9 m\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 kh\u1ea3 ki\u1ebfn c\u1ee7a th\u00e0nh ph\u1ea7n \u0111\u00f3. Kh\u1ea3 ki\u1ebfn c\u1ee7a m\u1ed9t thu\u1ed9c t\u00ednh hay thao t\u00e1c x\u00e1c \u0111\u1ecbnh xem c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a c\u00e1c l\u1edbp kh\u00e1c c\u00f3 th\u1ec3 &#8220;th\u1ea5y&#8221; hay truy c\u1eadp v\u00e0o thu\u1ed9c t\u00ednh hay thao t\u00e1c \u0111\u00f3 hay kh\u00f4ng.<\/p>\n<p>UML h\u1ed7 tr\u1ee3 b\u1ed1n m\u1ee9c \u0111\u1ed9 kh\u1ea3 ki\u1ebfn sau:<\/p>\n<p>C\u00e1c k\u00fd t\u1ef1 ~, +, # v\u00e0 \u2013 \u0111\u1eb7t tr\u01b0\u1edbc t\u00ean c\u1ee7a m\u1ed9t thu\u1ed9c t\u00ednh hay thao t\u00e1c trong m\u1ed9t l\u1edbp cho bi\u1ebft m\u1ee9c \u0111\u1ed9 kh\u1ea3 ki\u1ebfn c\u1ee7a n\u00f3:<\/p>\n<ul>\n<li><strong>Kh\u1ea3 ki\u1ebfn g\u00f3i<\/strong> (\u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng k\u00fd t\u1ef1 ~) c\u00f3 ngh\u0129a l\u00e0 b\u1ea5t k\u1ef3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o t\u1eeb m\u1ed9t l\u1edbp trong c\u00f9ng m\u1ed9t g\u00f3i \u0111\u1ec1u c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y v\u00e0 s\u1eed d\u1ee5ng l\u1edbp \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/li>\n<li><strong>Kh\u1ea3 ki\u1ebfn c\u00f4ng khai<\/strong> (+) c\u00f3 ngh\u0129a l\u00e0 b\u1ea5t k\u1ef3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o t\u1eeb b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o c\u0169ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh hay thao t\u00e1c \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/li>\n<li><strong>Kh\u1ea3 ki\u1ebfn b\u1ea3o v\u1ec7<\/strong> (#) c\u00f3 ngh\u0129a l\u00e0 ch\u1ec9 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u1eeb c\u00e1c l\u1edbp con c\u1ee7a l\u1edbp \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh (t\u1ee9c l\u00e0 c\u00e1c l\u1edbp \u1edf m\u1ee9c th\u1ea5p h\u01a1n trong th\u1ee9 t\u1ef1 ph\u00e2n c\u1ea5p) m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp thu\u1ed9c t\u00ednh hay thao t\u00e1c.<\/li>\n<li><strong>Kh\u1ea3 ki\u1ebfn ri\u00eang t\u01b0<\/strong> (-) c\u00f3 ngh\u0129a l\u00e0 ch\u1ec9 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a ch\u00ednh l\u1edbp \u0111\u00f3 m\u1edbi c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh hay thao t\u00e1c.<\/li>\n<\/ul>\n<p>H\u00ecnh \u1ea3nh sau \u0111\u00e2y hi\u1ec3n th\u1ecb c\u00e1c b\u1ed9 ch\u1ecdn kh\u1ea3 ki\u1ebfn cho c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c v\u00ed d\u1ee5:<\/p>\n<p><img alt=\"Class Visibility\" decoding=\"async\" src=\"https:\/\/www.archimetric.com\/wp-content\/uploads\/2022\/02\/04-class-attributes-with-different-visibility.png\"\/><\/p>\n<p id=\"LEMeklj\"><img alt=\"\" class=\"alignnone size-full wp-image-6091\" decoding=\"async\" height=\"141\" loading=\"lazy\" sizes=\"auto, (max-width: 357px) 100vw, 357px\" src=\"https:\/\/www.archimetric.com\/wp-content\/uploads\/2021\/09\/img_6141b1417ed03.png\" srcset=\"https:\/\/www.archimetric.com\/wp-content\/uploads\/2021\/09\/img_6141b1417ed03.png 357w, https:\/\/www.archimetric.com\/wp-content\/uploads\/2021\/09\/img_6141b1417ed03-300x118.png 300w, https:\/\/www.archimetric.com\/wp-content\/uploads\/2021\/09\/img_6141b1417ed03-200x79.png 200w\" width=\"357\"\/><\/p>\n<p><!--more--><\/p>\n<h3>Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML)<\/h3>\n<ul>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-uml\/\">UML l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/why-uml-modeling\/\">T\u1ea1i sao l\u1ea1i s\u1eed d\u1ee5ng m\u00f4 h\u00ecnh h\u00f3a UML?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/overview-of-the-14-uml-diagram-types\/\">T\u1ed5ng quan v\u1ec1 14 lo\u1ea1i s\u01a1 \u0111\u1ed3 UML<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-class-diagram\/\">S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/what-is-object-diagram\/\">S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/uml-extensibility-mechanism\/\">C\u01a1 ch\u1ebf m\u1edf r\u1ed9ng UML l\u00e0 g\u00ec?<\/a><\/li>\n<li><a href=\"https:\/\/www.visual-paradigm.com\/guide\/uml-unified-modeling-language\/uml-practical-guide\/\">H\u01b0\u1edbng d\u1eabn th\u1ef1c h\u00e0nh UML \u2013 T\u1ea5t c\u1ea3 nh\u1eefng g\u00ec b\u1ea1n c\u1ea7n bi\u1ebft v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a UML<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>UML\u652f\u6301\u4ee5\u4e0b\u56db\u4e2a\u5c42\u6b21\u7684\u53ef\u89c1\u6027: \u7c7b\u4e2d\u5c5e\u6027\u548c\u64cd\u4f5c\u540d\u79f0\u524d\u7684~, +, -# \u548c &#8211; \u7b26\u53f7\u8868\u793a\u5c5e\u6027\u548c\u64cd\u4f5c\u7684\u53ef\u89c1\u6027\u3002<br \/>\n\u5c01\u88c5 (encapsulation) \u662f\u6570\u636e\u9690\u85cf\u7684\u539f\u5219:\u5bf9\u8c61\u9690\u85cf\u5176\u6570\u636e\uff0c\u4e0d\u8ba9\u5916\u754c\u770b\u5230\u5e76\u4e14\u53ea\u5141\u8bb8\u5916\u90e8\u4eba\u5458\u901a\u8fc7\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5\u6765\u64cd\u4f5c\u8be5\u6570\u636e\u3002\u7684<br \/>\n\u7c7b\u7684\u5143\u7d20\u88ab\u5c01\u88c5\u5728\u8be5\u7c7b\u4e2d\u7684\u7a0b\u5ea6\u53d6\u51b3\u4e8e\u5143\u7d20\u7684\u53ef\u89c1\u6027\u7ea7\u522b\u3002\u67d0\u5c5e\u6027\u6216\u67d0\u7269\u7684\u53ef\u89c1\u6027\u64cd\u4f5c\u6307\u5b9a\u5c5e\u4e8e\u5176\u4ed6\u7c7b\u7684\u5bf9\u8c61\u662f\u5426\u53ef\u4ee5\u201c\u770b\u5230\u201d\u8be5\u5c5e\u6027\u6216<br \/>\n\u64cd\u4f5c\u3002<\/p>\n","protected":false},"author":3479,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn trong s\u01a1 \u0111\u1ed3 l\u1edbp UML","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn (c\u00f4ng khai, ri\u00eang t\u01b0, b\u1ea3o v\u1ec7, g\u00f3i) cho c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c trong s\u01a1 \u0111\u1ed3 l\u1edbp UML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u +, -, # v\u00e0 ~.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[127],"tags":[],"class_list":["post-10866","post","type-post","status-publish","format-standard","hentry","category-unified-modeling-language"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn trong s\u01a1 \u0111\u1ed3 l\u1edbp UML<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn (c\u00f4ng khai, ri\u00eang t\u01b0, b\u1ea3o v\u1ec7, g\u00f3i) cho c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c trong s\u01a1 \u0111\u1ed3 l\u1edbp UML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u +, -, # v\u00e0 ~.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.archimetric.com\/vn\/how-to-specify-visibility-in-uml-class-diagrams\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn trong s\u01a1 \u0111\u1ed3 l\u1edbp UML\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc c\u00e1ch x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 ki\u1ebfn (c\u00f4ng khai, ri\u00eang t\u01b0, b\u1ea3o v\u1ec7, g\u00f3i) cho c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c trong s\u01a1 \u0111\u1ed3 l\u1edbp 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