{"id":10368,"date":"2025-12-03T17:55:50","date_gmt":"2025-12-03T09:55:50","guid":{"rendered":"https:\/\/www.cybermedian.com\/vn\/class-vs-object-diagram-when-to-use-instances\/"},"modified":"2026-04-14T18:57:22","modified_gmt":"2026-04-14T10:57:22","slug":"class-vs-object-diagram-when-to-use-instances","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/vn\/class-vs-object-diagram-when-to-use-instances\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 L\u1edbp so v\u1edbi S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng &#8211; Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng c\u00e1c th\u1ec3 hi\u1ec7n"},"content":{"rendered":"<p>C\u1ea3 hai <a href=\"https:\/\/www.cybermedian.com\/mastering-the-uml-class-diagram-syntax-and-examples\/\">S\u01a1 \u0111\u1ed3 L\u1edbp UML<\/a> v\u00e0 <a href=\"https:\/\/www.cybermedian.com\/uml-object-diagram-capturing-a-system-snapshot\/\">S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng UML<\/a>thu\u1ed9c gia \u0111\u00ecnh c\u1ee7a <strong>S\u01a1 \u0111\u1ed3 C\u1ea5u tr\u00fac<\/strong>, c\u00f3 ngh\u0129a l\u00e0 ch\u00fang m\u00f4 h\u00ecnh h\u00f3a c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Tuy nhi\u00ean, ch\u00fang ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch c\u01a1 b\u1ea3n kh\u00e1c nhau: s\u01a1 \u0111\u1ed3 L\u1edbp \u0111\u1ecbnh ngh\u0129a b\u1ea3n v\u1ebd tr\u1eebu t\u01b0\u1ee3ng, trong khi s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng ghi l\u1ea1i m\u1ed9t th\u1ef1c t\u1ebf c\u1ee5 th\u1ec3 t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh.<\/p>\n<p>Hi\u1ec3u r\u00f5 khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng t\u1eebng lo\u1ea1i l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng \u0111\u1ec3 ph\u00e2n t\u00edch v\u00e0 giao ti\u1ebfp hi\u1ec7u qu\u1ea3 theo h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n<h2>M\u1ed1i quan h\u1ec7 v\u00e0 l\u00fd do so s\u00e1nh<\/h2>\n<h3>M\u1ed1i quan h\u1ec7 Kh\u1edfi t\u1ea1o: T\u1eeb \u0110\u1eb7c t\u1ea3 \u0111\u1ebfn Th\u1ef1c hi\u1ec7n<\/h3>\n<p>S\u01a1 \u0111\u1ed3 L\u1edbp v\u00e0 S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng duy tr\u00ec m\u1ed9t m\u1ed1i quan h\u1ec7 <strong>m\u1ed1i quan h\u1ec7 kh\u1edfi t\u1ea1o<\/strong>. S\u01a1 \u0111\u1ed3 L\u1edbp \u0111\u00f3ng vai tr\u00f2 l\u00e0 <em>\u0111\u1eb7c t\u1ea3 tr\u1eebu t\u01b0\u1ee3ng<\/em>, x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac \u0111\u01b0\u1ee3c ph\u00e9p, trong khi s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng cung c\u1ea5p m\u1ed9t <em>th\u1ef1c hi\u1ec7n c\u1ee5 th\u1ec3<\/em>ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u0111\u1ecbnh ngh\u0129a \u0111\u00f3.<\/p>\n<ul>\n<li><strong>S\u01a1 \u0111\u1ed3 L\u1edbp (\u0110\u1eb7c t\u1ea3):<\/strong>X\u00e1c l\u1eadp c\u1ea5u tr\u00fac, ki\u1ec3u thu\u1ed9c t\u00ednh, thao t\u00e1c v\u00e0 quy t\u1eafc b\u1ed9i s\u1ed1 cho t\u1ea5t c\u1ea3 c\u00e1c m\u1ed1i quan h\u1ec7 ti\u1ec1m n\u0103ng.<\/li>\n<li><strong>S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng (Th\u1ef1c hi\u1ec7n):<\/strong>Minh h\u1ecda c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 ph\u1ea3i tu\u00e2n theo c\u00e1c quy t\u1eafc do c\u00e1c l\u1edbp t\u01b0\u01a1ng \u1ee9ng \u0111\u1eb7t ra, th\u1ec3 hi\u1ec7n c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh th\u1ef1c t\u1ebf v\u00e0 c\u00e1c li\u00ean k\u1ebft c\u1ee5 th\u1ec3 (c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed1i quan h\u1ec7) \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m th\u1ef1c thi nh\u1ea5t \u0111\u1ecbnh.<\/li>\n<\/ul>\n<p>Do \u0111\u00f3, s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t <strong>c\u00f4ng c\u1ee5 x\u00e1c minh t\u00ednh ph\u00f9 h\u1ee3p m\u00f4 h\u00ecnh<\/strong>, x\u00e1c minh c\u1ea5u tr\u00fac tr\u1eebu t\u01b0\u1ee3ng \u0111\u1ed1i v\u1edbi m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 v\u00e0 th\u1ef1c t\u1ebf.<\/p>\n<h3>L\u00fd do so s\u00e1nh<\/h3>\n<p>Nhu c\u1ea7u so s\u00e1nh hai s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb th\u00e1ch th\u1ee9c v\u1ed1n c\u00f3 trong vi\u1ec7c ph\u00e2n bi\u1ec7t gi\u1eefa \u0111\u1ecbnh ngh\u0129a m\u00f4 h\u00ecnh tr\u1eebu t\u01b0\u1ee3ng v\u00e0 tr\u1ea1ng th\u00e1i th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3:<\/p>\n<ol>\n<li><strong>S\u1ef1 m\u01a1 h\u1ed3 v\u1ec1 ng\u1eef ngh\u0129a trong k\u00fd hi\u1ec7u:<\/strong>C\u1ea3 hai s\u01a1 \u0111\u1ed3 \u0111\u1ec1u s\u1eed d\u1ee5ng c\u00e1c y\u1ebfu t\u1ed1 h\u00ecnh \u1ea3nh t\u01b0\u01a1ng t\u1ef1 (h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng), t\u1ea1o ra s\u1ef1 t\u01b0\u01a1ng \u0111\u1ed3ng h\u00ecnh \u1ea3nh b\u1ec1 ngo\u00e0i c\u00f3 th\u1ec3 l\u00e0m m\u1edd \u0111i s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i v\u1ec1 m\u1ee5c \u0111\u00edch ng\u1eef ngh\u0129a (\u0111\u1ecbnh ngh\u0129a ki\u1ec3u so v\u1edbi d\u1eef li\u1ec7u th\u1ec3 hi\u1ec7n).<\/li>\n<li><strong>S\u1eed d\u1ee5ng sai ph\u1ea1m vi:<\/strong> C\u00e1c nh\u00e0 m\u00f4 h\u00ecnh th\u01b0\u1eddng nh\u1ea7m l\u1eabn m\u1ee5c \u0111\u00edch c\u1ee7a <strong>\u0111\u1ecbnh ngh\u0129a h\u1ec7 th\u1ed1ng<\/strong> (<a href=\"https:\/\/chat.visual-paradigm.com\/diagram\/uml-class-diagram\/\">S\u01a1 \u0111\u1ed3 l\u1edbp<\/a>) v\u1edbi <strong>x\u00e1c minh thi\u1ebft k\u1ebf<\/strong> (<a href=\"https:\/\/chat.visual-paradigm.com\/diagram\/uml-object-diagram\/\">S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/a>), d\u1eabn \u0111\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn t\u00e0i li\u1ec7u kh\u00f4ng hi\u1ec7u qu\u1ea3 ho\u1eb7c sai l\u1ec7ch.<\/li>\n<li><strong>X\u00e1c minh thi\u1ebft k\u1ebf ph\u1ee9c t\u1ea1p:<\/strong> S\u1ef1 so s\u00e1nh l\u00e0m n\u1ed5i b\u1eadt vai tr\u00f2 chuy\u00ean bi\u1ec7t c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng trong vi\u1ec7c x\u00e1c minh \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp, c\u1ee5 th\u1ec3 l\u00e0 minh ch\u1ee9ng t\u00ednh kh\u1ea3 thi v\u00e0 h\u1ec7 qu\u1ea3 c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p nh\u01b0 t\u1ed5ng h\u1ee3p, k\u1ebft h\u1ee3p v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1.<\/li>\n<\/ol>\n<h2>1. S\u01a1 \u0111\u1ed3 l\u1edbp: B\u1ea3n v\u1ebd ph\u00e1c th\u1ea3o tr\u1eebu t\u01b0\u1ee3ng<\/h2>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac quan tr\u1ecdng nh\u1ea5t trong UML. N\u00f3 bi\u1ec3u di\u1ec5n <strong>\u0111\u1ecbnh ngh\u0129a<\/strong> c\u1ee7a h\u1ec7 th\u1ed1ng\u2014c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 t\u0129nh gi\u1eefa ch\u00fang.<\/p>\n<p id=\"rrSlSrh\"><img alt=\"\" class=\"alignnone size-full wp-image-14535\" decoding=\"async\" height=\"904\" loading=\"lazy\" sizes=\"auto, (max-width: 1218px) 100vw, 1218px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693007f9d7435.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693007f9d7435.png 1218w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693007f9d7435-300x223.png 300w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693007f9d7435-1024x760.png 1024w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693007f9d7435-768x570.png 768w\" width=\"1218\"\/><\/p>\n<h3>N\u00f3 m\u00f4 h\u00ecnh h\u00f3a \u0111i\u1ec1u g\u00ec:<\/h3>\n<ul>\n<li><strong>C\u00e1c l\u1edbp:<\/strong> C\u00e1c ki\u1ec3u tr\u1eebu t\u01b0\u1ee3ng, th\u1ec3 hi\u1ec7n c\u00e1c thu\u1ed9c t\u00ednh (d\u1eef li\u1ec7u) v\u00e0 thao t\u00e1c (ph\u01b0\u01a1ng th\u1ee9c).<\/li>\n<li><strong>C\u00e1c m\u1ed1i quan h\u1ec7:<\/strong>X\u00e1c \u0111\u1ecbnh c\u00e1c <em>kh\u1ea3 n\u0103ng<\/em>k\u1ebft n\u1ed1i, ch\u1eb3ng h\u1ea1n nh\u01b0 <strong>C\u00e1c li\u00ean k\u1ebft<\/strong> (li\u00ean k\u1ebft chung), <strong>T\u1ed5ng qu\u00e1t h\u00f3a<\/strong> (k\u1ebf th\u1eeba), <strong>T\u1ed5ng h\u1ee3p<\/strong> (m\u1ed1i quan h\u1ec7 c\u00f3-a), v\u00e0 <strong>K\u1ebft h\u1ee3p<\/strong> (quy\u1ec1n s\u1edf h\u1eefu m\u1ea1nh).<\/li>\n<li><strong>S\u1ed1 l\u01b0\u1ee3ng:<\/strong>X\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c (v\u00ed d\u1ee5: $1..*$ c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t-\u0111a).<\/li>\n<\/ul>\n<h3>Khi n\u00e0o s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 l\u1edbp:<\/h3>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai \u0111\u1ec3:<\/p>\n<ul>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac h\u1ec7 th\u1ed1ng:<\/strong>Thi\u1ebft l\u1eadp t\u1eeb v\u1ef1ng c\u1ee7a h\u1ec7 th\u1ed1ng (t\u1ee9c l\u00e0 c\u00e1c l\u1edbp).<\/li>\n<li><strong>L\u00ean k\u1ebf ho\u1ea1ch tri\u1ec3n khai:<\/strong>L\u00e0 \u0111\u1ea7u v\u00e0o tr\u1ef1c ti\u1ebfp \u0111\u1ec3 vi\u1ebft m\u00e3 trong c\u00e1c ng\u00f4n ng\u1eef h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (Java, C++, Python, v.v.).<\/li>\n<li><strong>M\u00f4 h\u00ecnh h\u00f3a mi\u1ec1n kinh doanh:<\/strong>T\u1ea1o b\u1ea3n \u0111\u1ed3 kh\u00e1i ni\u1ec7m c\u1ee7a c\u00e1c th\u1ef1c th\u1ec3 th\u1ebf gi\u1edbi th\u1ef1c v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang (M\u00f4 h\u00ecnh mi\u1ec1n).<\/li>\n<\/ul>\n<p><strong>So s\u00e1nh:<\/strong>S\u01a1 \u0111\u1ed3 l\u1edbp gi\u1ed1ng nh\u01b0 b\u1ea3n v\u1ebd ki\u1ebfn tr\u00fac c\u1ee7a m\u1ed9t ng\u00f4i nh\u00e0. N\u00f3 x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng ph\u00f2ng, k\u00edch th\u01b0\u1edbc v\u00e0 v\u1eadt li\u1ec7u, nh\u01b0ng ng\u00f4i nh\u00e0 th\u1ef1c t\u1ebf v\u1eabn ch\u01b0a \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng.<\/p>\n<h2>2. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng: B\u1ea3n ch\u1ee5p c\u1ee5 th\u1ec3<\/h2>\n<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp. N\u00f3 t\u1eadp trung v\u00e0o<strong>c\u00e1c th\u1ec3 hi\u1ec7n<\/strong>(\u0111\u1ed1i t\u01b0\u1ee3ng) v\u00e0 c\u00e1c li\u00ean k\u1ebft c\u1ee5 th\u1ec3 t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh trong qu\u00e1 tr\u00ecnh th\u1ef1c thi h\u1ec7 th\u1ed1ng.<\/p>\n<p id=\"FaELrMw\"><img alt=\"\" class=\"alignnone size-full wp-image-14539\" decoding=\"async\" height=\"623\" loading=\"lazy\" sizes=\"auto, (max-width: 514px) 100vw, 514px\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693009219ab3c.png\" srcset=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693009219ab3c.png 514w, https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/12\/img_693009219ab3c-248x300.png 248w\" width=\"514\"\/><\/p>\n<h3>N\u00f3 m\u00f4 h\u00ecnh h\u00f3a:<\/h3>\n<ul>\n<li><strong>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>C\u00e1c th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean c\u1ee7a m\u1ed9t l\u1edbp, \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh mang gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf, th\u1ef1c t\u1ebf th\u1ebf gi\u1edbi<strong>gi\u00e1 tr\u1ecb<\/strong>.\n<ul>\n<li><em>K\u00fd hi\u1ec7u:<\/em>T\u00ean \u0111\u01b0\u1ee3c g\u1ea1ch ch\u00e2n v\u00e0 tu\u00e2n theo \u0111\u1ecbnh d\u1ea1ng:<code>t\u00ean\u0110\u1ed1iT\u01b0\u1ee3ng : T\u00eanL\u1edbp<\/code>(v\u00ed d\u1ee5:<code>\u0111\u01a1nH\u00e0ng123 : \u0110\u01a1nH\u00e0ng<\/code>).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Li\u00ean k\u1ebft:<\/strong>C\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a c\u00e1c li\u00ean k\u1ebft, cho th\u1ea5y \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 n\u00e0o \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 kh\u00e1c.<\/li>\n<li><strong>Tr\u1ea1ng th\u00e1i:<\/strong>Minh h\u1ecda tr\u1ea1ng th\u00e1i d\u1eef li\u1ec7u th\u1ef1c t\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ee5p \u1ea3nh m\u00e0n h\u00ecnh.<\/li>\n<\/ul>\n<h3>Khi n\u00e0o s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/h3>\n<p>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m th\u1eed, x\u00e1c minh v\u00e0 minh h\u1ecda c\u00e1c t\u00ecnh hu\u1ed1ng ph\u1ee9c t\u1ea1p:<\/p>\n<ul>\n<li><strong>Minh h\u1ecda t\u00ednh \u0111a d\u1ea1ng ph\u1ee9c t\u1ea1p:<\/strong>Ch\u1ee9ng minh r\u1eb1ng m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111a (\u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 l\u1edbp) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o \u0111\u00fang c\u00e1ch.<\/li>\n<li><strong>X\u00e1c minh c\u00e1c tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed:<\/strong>Hi\u1ec3n th\u1ecb tr\u1ea1ng th\u00e1i ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tr\u01b0\u1edbc ho\u1eb7c sau m\u1ed9t thao t\u00e1c quan tr\u1ecdng (v\u00ed d\u1ee5: ch\u1ee9ng minh gi\u1ecf h\u00e0ng tr\u1ed1ng sau khi thanh to\u00e1n).<\/li>\n<li><strong>Gi\u1ea3i th\u00edch c\u00e1c tr\u01b0\u1eddng h\u1ee3p bi\u00ean:<\/strong>Tr\u00ecnh b\u00e0y tr\u1ef1c quan m\u1ed9t c\u1ea5u h\u00ecnh \u0111\u1ed1i t\u01b0\u1ee3ng g\u00e2y v\u1ea5n \u0111\u1ec1 (v\u00ed d\u1ee5: m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1ch h\u00e0ng l\u00e0 null).<\/li>\n<\/ul>\n<p><strong>So s\u00e1nh:<\/strong>M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng gi\u1ed1ng nh\u01b0 m\u1ed9t b\u1ee9c \u1ea3nh c\u1ee7a ng\u00f4i nh\u00e0 th\u1ef1c t\u1ebf sau khi \u0111\u00e3 \u0111\u01b0\u1ee3c trang tr\u00ed v\u00e0 c\u00f3 ng\u01b0\u1eddi \u1edf. N\u00f3 cho th\u1ea5y r\u1eb1ng<em>b\u1ed1 tr\u00ed n\u1ed9i th\u1ea5t c\u1ee5 th\u1ec3 n\u00e0y<\/em>ng\u00f4i nh\u00e0 c\u1ee5 th\u1ec3 n\u00e0y c\u00f3 s\u01a1n m\u00e0u xanh, <em>b\u1ed1 tr\u00ed n\u1ed9i th\u1ea5t c\u1ee5 th\u1ec3 n\u00e0y<\/em>v\u00e0 <em>b\u1ed1 tr\u00ed n\u1ed9i th\u1ea5t c\u1ee5 th\u1ec3 n\u00e0y<\/em>b\u1ed1 tr\u00ed n\u1ed9i th\u1ea5t c\u1ee5 th\u1ec3 n\u00e0y.<\/p>\n<h2>3. L\u1edbp so v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng: So s\u00e1nh nhanh<\/h2>\n<table>\n<tbody>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>S\u01a1 \u0111\u1ed3 l\u1edbp<\/th>\n<th>S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/th>\n<\/tr>\n<tr>\n<td><strong>Tr\u1ecdng t\u00e2m<\/strong><\/td>\n<td>C\u1ea5u tr\u00fac tr\u1eebu t\u01b0\u1ee3ng, \u0111\u1ecbnh ngh\u0129a<\/td>\n<td>C\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3, \u1ea3nh ch\u1ee5p<\/td>\n<\/tr>\n<tr>\n<td><strong>C\u00e1c th\u00e0nh ph\u1ea7n<\/strong><\/td>\n<td>L\u1edbp, li\u00ean k\u1ebft, t\u00ednh \u0111a d\u1ea1ng<\/td>\n<td>\u0110\u1ed1i t\u01b0\u1ee3ng, li\u00ean k\u1ebft, gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/td>\n<\/tr>\n<tr>\n<td><strong>M\u1ee5c \u0111\u00edch<\/strong><\/td>\n<td>Thi\u1ebft k\u1ebf, sinh m\u00e3, m\u00f4 h\u00ecnh h\u00f3a mi\u1ec1n<\/td>\n<td>Ki\u1ec3m th\u1eed, x\u00e1c minh, minh h\u1ecda t\u00ecnh hu\u1ed1ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Th\u1eddi gian<\/strong><\/td>\n<td>T\u0129nh (\u00c1p d\u1ee5ng trong m\u1ecdi th\u1eddi \u0111i\u1ec3m)<\/td>\n<td>\u0110\u1ed9ng (\u00c1p d\u1ee5ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh)<\/td>\n<\/tr>\n<tr>\n<td><strong>K\u00fd hi\u1ec7u<\/strong><\/td>\n<td>T\u00ean l\u1edbp v\u00e0 thu\u1ed9c t\u00ednh\/ph\u00e9p to\u00e1n<\/td>\n<td><strong>G\u1ea1ch ch\u00e2n<\/strong>t\u00ean th\u1ef1c th\u1ec3 v\u00e0 thu\u1ed9c t\u00ednh<strong>gi\u00e1 tr\u1ecb<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>T\u00f3m t\u1eaft: Ch\u1ecdn \u0111\u00fang c\u00f4ng c\u1ee5<\/h2>\n<ul>\n<li><strong>B\u1eaft \u0111\u1ea7u v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp:<\/strong>S\u1eed d\u1ee5ng n\u00f3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n. \u0110\u00e2y l\u00e0 b\u1ea3n v\u1ebd s\u01a1 b\u1ed9 ch\u00ednh c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>X\u00e1c minh b\u1eb1ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>S\u1eed d\u1ee5ng n\u00f3 m\u1ed9t c\u00e1ch ti\u1ebft ch\u1ebf \u0111\u1ec3 minh h\u1ecda c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3, quan tr\u1ecdng, c\u00e1c tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed ho\u1eb7c c\u00e1c c\u1ea5u h\u00ecnh d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p m\u00e0 kh\u00f4ng th\u1ec3 d\u1ec5 d\u00e0ng hi\u1ec3u \u0111\u01b0\u1ee3c ch\u1ec9 b\u1eb1ng c\u00e1ch xem s\u01a1 \u0111\u1ed3 l\u1edbp tr\u1eebu t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng h\u1ee3p l\u00fd c\u1ea3 hai s\u01a1 \u0111\u1ed3, b\u1ea1n c\u00f3 th\u1ec3 truy\u1ec1n \u0111\u1ea1t c\u1ea3 <em>ti\u1ec1m n\u0103ng<\/em>v\u00e0 <em>th\u1ef1c t\u1ebf<\/em>c\u1ee7a c\u1ea5u tr\u00fac t\u0129nh h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p>\u0110\u1ec3 c\u00f3 th\u00eam th\u00f4ng tin v\u1ec1 UML v\u00e0 tr\u1ef1c quan h\u00f3a d\u1ef1a tr\u00ean tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o, h\u00e3y xem qua <a href=\"https:\/\/www.cybermedian.com\/the-definitive-guide-to-the-unified-modeling-language-uml\/\">trung t\u00e2m t\u00e0i nguy\u00ean UML<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u1ea3 hai S\u01a1 \u0111\u1ed3 L\u1edbp UML v\u00e0 S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng UMLthu\u1ed9c gia \u0111\u00ecnh c\u1ee7a S\u01a1 \u0111\u1ed3 C\u1ea5u tr\u00fac, c\u00f3<\/p>\n","protected":false},"author":5,"featured_media":10369,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-10368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u01a1 \u0111\u1ed3 L\u1edbp so v\u1edbi S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng &#8211; 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