{"id":1150,"date":"2026-03-27T16:37:54","date_gmt":"2026-03-27T16:37:54","guid":{"rendered":"https:\/\/www.method-post.com\/vi\/class-diagram-components-guide-beginners\/"},"modified":"2026-03-27T16:37:54","modified_gmt":"2026-03-27T16:37:54","slug":"class-diagram-components-guide-beginners","status":"publish","type":"post","link":"https:\/\/www.method-post.com\/vi\/class-diagram-components-guide-beginners\/","title":{"rendered":"Ph\u00e2n t\u00edch to\u00e0n di\u1ec7n c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp: \u0110i\u1ec1u m\u00e0 m\u1ecdi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u c\u1ea7n bi\u1ebft tr\u01b0\u1edbc khi l\u1eadp tr\u00ecnh"},"content":{"rendered":"<p>Khi b\u1eaft \u0111\u1ea7u m\u1ed9t d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m m\u1edbi, b\u01b0\u1edbc quan tr\u1ecdng nh\u1ea5t th\u01b0\u1eddng x\u1ea3y ra tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 n\u00e0o. B\u01b0\u1edbc n\u00e0y bao g\u1ed3m vi\u1ec7c l\u00ean k\u1ebf ho\u1ea1ch c\u1ea5u tr\u00fac \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1c m\u00f4 h\u00ecnh tr\u1ef1c quan. Trong s\u1ed1 c\u00e1c s\u01a1 \u0111\u1ed3 kh\u00e1c nhau c\u00f3 s\u1eb5n trong Ng\u00f4n ng\u1eef M\u00f4 h\u00ecnh h\u00f3a \u0110\u01a1n nh\u1ea5t (UML), s\u01a1 \u0111\u1ed3 L\u1edbp n\u1ed5i b\u1eadt nh\u01b0 n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf, th\u1ec3 hi\u1ec7n c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a h\u1ec7 th\u1ed1ng. Hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 nh\u00e0 ph\u00e1t tri\u1ec3n n\u00e0o nh\u1eb1m x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00e0 duy tr\u00ec \u0111\u01b0\u1ee3c.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn chi ti\u1ebft v\u1ec1 t\u1eebng th\u00e0nh ph\u1ea7n trong s\u01a1 \u0111\u1ed3 l\u1edbp. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u00e1ch \u0111\u1ecbnh ngh\u0129a c\u00e1c l\u1edbp, qu\u1ea3n l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 v\u00e0 \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc v\u1ec1 m\u1ee9c \u0111\u1ed9 hi\u1ec3n th\u1ecb. B\u1eb1ng c\u00e1ch n\u1eafm v\u1eefng nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y, b\u1ea1n \u0111\u1ea3m b\u1ea3o m\u00e3 ngu\u1ed3n c\u1ee7a m\u00ecnh ph\u1ea3n \u00e1nh m\u1ed9t ki\u1ebfn tr\u00fac logic m\u00e0 c\u00e1c \u0111\u1ed9i nh\u00f3m c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng theo d\u00f5i.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Cartoon infographic explaining UML class diagram components for beginners: class box structure with name\/attributes\/methods, visibility modifiers (public\/private\/protected\/package), relationship types (association, aggregation, composition, inheritance, dependency), multiplicity notation, and best practices for object-oriented design\" decoding=\"async\" src=\"https:\/\/www.method-post.com\/wp-content\/uploads\/2026\/03\/class-diagram-components-beginners-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 g\u00ec? \ud83c\udfd7\ufe0f<\/h2>\n<p>S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp c\u1ee7a h\u1ec7 th\u1ed1ng, thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang, c\u00e1c thao t\u00e1c (ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c) v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 th\u1ec3 hi\u1ec7n h\u00e0nh vi theo th\u1eddi gian, s\u01a1 \u0111\u1ed3 l\u1edbp t\u1eadp trung v\u00e0o c\u1ea5u tr\u00fac t\u0129nh.<\/p>\n<ul>\n<li><strong>C\u1ea5u tr\u00fac t\u0129nh:<\/strong> N\u00f3 \u0111\u1ea1i di\u1ec7n cho h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/li>\n<li><strong>H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> N\u00f3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1ch c\u00e1c ng\u00f4n ng\u1eef hi\u1ec7n \u0111\u1ea1i nh\u01b0 Java, C++ v\u00e0 Python t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u.<\/li>\n<li><strong>T\u00e0i li\u1ec7u:<\/strong> N\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng gi\u1eefa c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 c\u00e1c b\u00ean li\u00ean quan.<\/li>\n<\/ul>\n<p>H\u00e3y ngh\u0129 \u0111\u1ebfn n\u00f3 nh\u01b0 m\u1ed9t b\u1ea3n v\u1ebd m\u1eb7t b\u1eb1ng ki\u1ebfn tr\u00fac cho m\u1ed9t ng\u00f4i nh\u00e0. B\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i nh\u00ecn th\u1ea5y h\u1ec7 th\u1ed1ng c\u1ea5p tho\u00e1t n\u01b0\u1edbc hay d\u00e2y \u0111i\u1ec7n \u0111\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c ph\u00f2ng v\u00e0 b\u1ee9c t\u01b0\u1eddng. T\u01b0\u01a1ng t\u1ef1, s\u01a1 \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n c\u00e1c &#8220;ph\u00f2ng&#8221; (l\u1edbp) v\u00e0 c\u00e1ch ch\u00fang k\u1ebft n\u1ed1i v\u1edbi nhau, m\u00e0 kh\u00f4ng c\u1ea7n chi ti\u1ebft h\u00f3a logic c\u1ee5 th\u1ec3 b\u00ean trong m\u1ed7i h\u00e0m.<\/p>\n<h2>C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a h\u1ed9p l\u1edbp \ud83d\udce6<\/h2>\n<p>\u1ede trung t\u00e2m c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 h\u1ed9p L\u1edbp. H\u00ecnh ch\u1eef nh\u1eadt n\u00e0y \u0111\u1ea1i di\u1ec7n cho m\u1ed9t l\u1edbp duy nh\u1ea5t trong h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c chia th\u00e0nh ba ng\u0103n.<\/p>\n<h3>1. T\u00ean l\u1edbp (Ng\u0103n tr\u00ean) \ud83c\udff7\ufe0f<\/h3>\n<p>Ph\u1ea7n tr\u00ean ch\u1ee9a t\u00ean c\u1ee7a l\u1edbp. C\u00e1c quy t\u1eafc \u0111\u1eb7t t\u00ean \u1edf \u0111\u00e2y r\u1ea5t quan tr\u1ecdng. S\u1eed d\u1ee5ng <strong>CamelCase<\/strong> cho t\u00ean l\u1edbp (v\u00ed d\u1ee5: <code>UserAccount<\/code>, <code>PaymentProcessor<\/code>). \u0110i\u1ec1u n\u00e0y gi\u00fap ph\u00e2n bi\u1ec7t l\u1edbp v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n<ul>\n<li><strong>Vi\u1ebft hoa:<\/strong> Lu\u00f4n b\u1eaft \u0111\u1ea7u b\u1eb1ng ch\u1eef hoa.<\/li>\n<li><strong>\u0110\u1ed9c nh\u1ea5t:<\/strong> \u0110\u1ea3m b\u1ea3o t\u00ean l\u00e0 duy nh\u1ea5t trong g\u00f3i ho\u1eb7c kh\u00f4ng gian t\u00ean.<\/li>\n<li><strong>D\u1ef1a tr\u00ean danh t\u1eeb:<\/strong> C\u00e1c l\u1edbp th\u01b0\u1eddng n\u00ean \u0111\u1ea1i di\u1ec7n cho danh t\u1eeb (v\u00ed d\u1ee5: Kh\u00e1ch h\u00e0ng, \u0110\u01a1n h\u00e0ng), ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u1ed9ng t\u1eeb.<\/li>\n<\/ul>\n<h3>2. Thu\u1ed9c t\u00ednh (Ng\u0103n gi\u1eefa) \ud83d\udcdd<\/h3>\n<p>Ph\u1ea7n gi\u1eefa li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh ho\u1eb7c thu\u1ed9c t\u00ednh c\u1ee7a l\u1edbp. C\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i ho\u1eb7c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef b\u1edfi m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp n\u00e0y.<\/p>\n<p>M\u1ed7i thu\u1ed9c t\u00ednh th\u01b0\u1eddng tu\u00e2n theo \u0111\u1ecbnh d\u1ea1ng n\u00e0y:<\/p>\n<p><code>\u0111\u1ed9 hi\u1ec3n th\u1ecb t\u00ean : ki\u1ec3u = gi\u00e1 tr\u1ecbBan \u0111\u1ea7u<\/code><\/p>\n<ul>\n<li><strong>\u0110\u1ed9 hi\u1ec3n th\u1ecb:<\/strong>X\u00e1c \u0111\u1ecbnh ai c\u00f3 th\u1ec3 truy c\u1eadp thu\u1ed9c t\u00ednh (xem ph\u1ea7n v\u1ec1 c\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed9 hi\u1ec3n th\u1ecb).<\/li>\n<li><strong>T\u00ean:<\/strong>T\u00ean bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00e3 ngu\u1ed3n.<\/li>\n<li><strong>Ki\u1ec3u:<\/strong>Ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5: Chu\u1ed7i, S\u1ed1 nguy\u00ean, Boolean).<\/li>\n<li><strong>Gi\u00e1 tr\u1ecb ban \u0111\u1ea7u:<\/strong>Gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh t\u00f9y ch\u1ecdn \u0111\u01b0\u1ee3c g\u00e1n khi t\u1ea1o.<\/li>\n<\/ul>\n<p><em>V\u00ed d\u1ee5:<\/em> <code>- s\u1ed1 d\u01b0 : double = 0.00<\/code><\/p>\n<h3>3. C\u00e1c thao t\u00e1c \/ Ph\u01b0\u01a1ng th\u1ee9c (Ph\u1ea7n d\u01b0\u1edbi c\u00f9ng) \u2699\ufe0f<\/h3>\n<p>Ph\u1ea7n d\u01b0\u1edbi c\u00f9ng li\u1ec7t k\u00ea c\u00e1c thao t\u00e1c ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c. \u0110\u00e2y l\u00e0 c\u00e1c h\u00e0nh vi m\u00e0 l\u1edbp c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n.<\/p>\n<p>\u0110\u1ecbnh d\u1ea1ng th\u01b0\u1eddng tr\u00f4ng nh\u01b0 sau:<\/p>\n<p><code>\u0111\u1ed9 hi\u1ec3n th\u1ecb t\u00eanThaoT\u00e1c (tham s\u1ed1) : ki\u1ec3uTr\u1ea3V\u1ec1<\/code><\/p>\n<ul>\n<li><strong>T\u00ean thao t\u00e1c:<\/strong>\u0110\u1ed9ng t\u1eeb m\u00f4 t\u1ea3 m\u1ed9t h\u00e0nh \u0111\u1ed9ng (v\u00ed d\u1ee5:<code>t\u00ednhT\u1ed5ng<\/code>, <code>\u0111\u0103ng nh\u1eadp<\/code>).<\/li>\n<li><strong>Tham s\u1ed1:<\/strong>C\u00e1c gi\u00e1 tr\u1ecb \u0111\u1ea7u v\u00e0o c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1ef1c thi ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n<li><strong>Ki\u1ec3u tr\u1ea3 v\u1ec1:<\/strong>Ki\u1ec3u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1 sau khi th\u1ef1c thi.<\/li>\n<\/ul>\n<p><em>V\u00ed d\u1ee5:<\/em> <code>+ n\u1ea1pTi\u1ec1n(s\u1ed1L\u01b0\u1ee3ng : double) : void<\/code><\/p>\n<h2>C\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed9 hi\u1ec3n th\u1ecb \ud83d\udd12<\/h2>\n<p>\u0110\u1ed9 hi\u1ec3n th\u1ecb x\u00e1c \u0111\u1ecbnh kh\u1ea3 n\u0103ng truy c\u1eadp c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c t\u1eeb c\u00e1c l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m then ch\u1ed1t trong \u0111\u00f3ng g\u00f3i. C\u00f3 b\u1ed1n k\u00fd hi\u1ec7u chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u01a1 \u0111\u1ed3.<\/p>\n<ul>\n<li><strong>C\u00f4ng khai (+):<\/strong>Truy c\u1eadp \u0111\u01b0\u1ee3c t\u1eeb b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o. \u0110\u00e2y l\u00e0 m\u1ee9c truy c\u1eadp m\u1edf r\u1ed9ng nh\u1ea5t.<\/li>\n<li><strong>Ri\u00eang t\u01b0 (-):<\/strong>Ch\u1ec9 truy c\u1eadp \u0111\u01b0\u1ee3c trong ch\u00ednh l\u1edbp \u0111\u00f3. \u0110\u00e2y l\u00e0 m\u1eb7c \u0111\u1ecbnh trong nhi\u1ec1u ng\u00f4n ng\u1eef v\u00e0 an to\u00e0n nh\u1ea5t cho d\u1eef li\u1ec7u n\u1ed9i b\u1ed9.<\/li>\n<li><strong>B\u1ea3o v\u1ec7 (#):<\/strong>Truy c\u1eadp \u0111\u01b0\u1ee3c trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con (con ch\u00e1u) c\u1ee7a n\u00f3. H\u1ed7 tr\u1ee3 k\u1ebf th\u1eeba.<\/li>\n<li><strong>G\u00f3i (~):<\/strong>Ch\u1ec9 truy c\u1eadp \u0111\u01b0\u1ee3c trong c\u00f9ng m\u1ed9t g\u00f3i ho\u1eb7c kh\u00f4ng gian t\u00ean. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng cho c\u00e1c l\u1edbp ti\u1ec7n \u00edch n\u1ed9i b\u1ed9.<\/li>\n<\/ul>\n<p>S\u1eed d\u1ee5ng \u0111\u00fang b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng s\u1ebd ng\u0103n ng\u1eeba c\u00e1c hi\u1ec7u \u1ee9ng ph\u1ee5 kh\u00f4ng mong mu\u1ed1n. N\u1ebfu b\u1ea1n c\u00f4ng khai m\u1ed9t thu\u1ed9c t\u00ednh ri\u00eang t\u01b0, c\u00e1c ph\u1ea7n kh\u00e1c trong m\u00e3 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u00f3 tr\u1ef1c ti\u1ebfp, b\u1ecf qua logic x\u00e1c th\u1ef1c.<\/p>\n<h2>Hi\u1ec3u r\u00f5 c\u00e1c m\u1ed1i quan h\u1ec7 \ud83d\udd17<\/h2>\n<p>C\u00e1c l\u1edbp hi\u1ebfm khi t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. Ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t h\u1ec7 th\u1ed1ng ho\u00e0n ch\u1ec9nh. Nh\u1eefng t\u01b0\u01a1ng t\u00e1c n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i c\u00e1c l\u1edbp, g\u1ecdi l\u00e0 m\u1ed1i quan h\u1ec7. Hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c.<\/p>\n<h3>1. Li\u00ean k\u1ebft \ud83d\udd17<\/h3>\n<p>M\u1ed9t li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac n\u01a1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp kh\u00e1c. \u0110\u00e2y l\u00e0 thu\u1eadt ng\u1eef chung cho m\u1ed9t li\u00ean k\u1ebft.<\/p>\n<ul>\n<li><strong>\u0110\u01b0\u1eddng li\u1ec1n:<\/strong>D\u00f9ng \u0111\u1ec3 v\u1ebd m\u1ed9t li\u00ean k\u1ebft ti\u00eau chu\u1ea9n.<\/li>\n<li><strong>H\u01b0\u1edbng:<\/strong>M\u0169i t\u00ean ch\u1ec9 h\u01b0\u1edbng kh\u1ea3 n\u0103ng \u0111i l\u1ea1i (ai bi\u1ebft ai).<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t <code>Gi\u00e1o vi\u00ean<\/code> d\u1ea1y m\u1ed9t <code>H\u1ecdc sinh<\/code>.<\/li>\n<\/ul>\n<h3>2. T\u00edch h\u1ee3p \ud83d\udfe2<\/h3>\n<p>T\u00edch h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u1eb7c bi\u1ec7t c\u1ee7a li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 &#8216;to\u00e0n th\u1ec3-ph\u1ea7n&#8217; n\u01a1i c\u00e1c ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3.<\/p>\n<ul>\n<li><strong>H\u00ecnh thoi r\u1ed7ng:<\/strong>\u0110\u1eb7t \u1edf ph\u00eda &#8216;to\u00e0n th\u1ec3&#8217; c\u1ee7a \u0111\u01b0\u1eddng.<\/li>\n<li><strong>\u0110\u1ed9c l\u1eadp:<\/strong>N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb h\u1ee7y, c\u00e1c ph\u1ea7n v\u1eabn t\u1ed3n t\u1ea1i.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t <code>Ph\u00f2ng ban<\/code> c\u00f3 <code>Nh\u00e2n vi\u00ean<\/code>. N\u1ebfu ph\u00f2ng ban \u0111\u00f3ng c\u1eeda, nh\u00e2n vi\u00ean v\u1eabn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u1edf n\u01a1i kh\u00e1c.<\/li>\n<\/ul>\n<h3>3. Th\u00e0nh ph\u1ea7n \ud83d\udfe6<\/h3>\n<p>Th\u00e0nh ph\u1ea7n l\u00e0 m\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a s\u1ef1 k\u1ebft h\u1ee3p. N\u00f3 ng\u1ee5 \u00fd r\u1eb1ng c\u00e1c b\u1ed9 ph\u1eadn kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3.<\/p>\n<ul>\n<li><strong>H\u00ecnh thoi \u0111\u1eadm:<\/strong>\u0110\u01b0\u1ee3c \u0111\u1eb7t \u1edf ph\u00eda &#8216;to\u00e0n th\u1ec3&#8217; c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng.<\/li>\n<li><strong>Ph\u1ee5 thu\u1ed9c:<\/strong> N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c b\u1ed9 ph\u1eadn c\u0169ng s\u1ebd b\u1ecb ph\u00e1 h\u1ee7y theo.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t <code>Ng\u00f4i nh\u00e0<\/code> c\u00f3 <code>Ph\u00f2ng<\/code>. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a ng\u00f4i nh\u00e0 \u0111\u00f3 n\u1eefa.<\/li>\n<\/ul>\n<h3>4. T\u1ed5ng qu\u00e1t h\u00f3a (K\u1ebf th\u1eeba) \ud83d\udcc9<\/h3>\n<p>T\u1ed5ng qu\u00e1t h\u00f3a bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 &#8216;l\u00e0 m\u1ed9t&#8217;. L\u1edbp con k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c t\u1eeb l\u1edbp cha.<\/p>\n<ul>\n<li><strong>M\u0169i t\u00ean tam gi\u00e1c tr\u1ed1ng:<\/strong>Ch\u1ec9 t\u1eeb l\u1edbp con \u0111\u1ebfn l\u1edbp cha.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng:<\/strong> Cho ph\u00e9p t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n v\u00e0 \u0111a h\u00ecnh.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t <code>Xe h\u01a1i<\/code> l\u00e0 m\u1ed9t <code>Ph\u01b0\u01a1ng ti\u1ec7n<\/code>. M\u1ed9t <code>Sedan<\/code> l\u00e0 m\u1ed9t <code>Xe h\u01a1i<\/code>.<\/li>\n<\/ul>\n<h3>5. Ph\u1ee5 thu\u1ed9c \ud83d\udd04<\/h3>\n<p>Ph\u1ee5 thu\u1ed9c cho th\u1ea5y r\u1eb1ng m\u1ed9t l\u1edbp s\u1eed d\u1ee5ng ho\u1eb7c ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp kh\u00e1c, nh\u01b0ng ch\u1ec9 trong th\u1eddi gian ng\u1eafn. Th\u01b0\u1eddng l\u00e0 m\u1ed1i quan h\u1ec7 &#8220;s\u1eed d\u1ee5ng-m\u1ed9t&#8221;.<\/p>\n<ul>\n<li><strong>M\u0169i t\u00ean g\u1ea1ch: <\/strong>Ch\u1ec9 t\u1eeb l\u1edbp ph\u1ee5 thu\u1ed9c \u0111\u1ebfn l\u1edbp \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/li>\n<li><strong>T\u00ednh t\u1ea1m th\u1eddi:<\/strong> M\u1ed1i quan h\u1ec7 th\u01b0\u1eddng ng\u1eafn h\u1ea1n (v\u00ed d\u1ee5: tham s\u1ed1 ph\u01b0\u01a1ng th\u1ee9c).<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t <code>B\u1ed9 t\u1ea1o b\u00e1o c\u00e1o<\/code> s\u1eed d\u1ee5ng m\u1ed9t <code>K\u1ebft n\u1ed1i c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/code> \u0111\u1ec3 l\u1ea5y d\u1eef li\u1ec7u, nh\u01b0ng kh\u00f4ng gi\u1eef tham chi\u1ebfu \u0111\u1ebfn n\u00f3 m\u00e3i m\u00e3i.<\/li>\n<\/ul>\n<p>\u0110\u1ec3 l\u00e0m r\u00f5 c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y, h\u00e3y tham kh\u1ea3o b\u1ea3ng so s\u00e1nh d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<table border=\"1\" cellpadding=\"10\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<th>Th\u1eddi gian t\u1ed3n t\u1ea1i c\u1ee7a ph\u1ea7n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Li\u00ean k\u1ebft<\/td>\n<td>\u0110\u01b0\u1eddng li\u1ec1n<\/td>\n<td>Li\u00ean k\u1ebft c\u1ea5u tr\u00fac<\/td>\n<td>\u0110\u1ed9c l\u1eadp<\/td>\n<\/tr>\n<tr>\n<td>T\u1ed5 h\u1ee3p<\/td>\n<td>H\u00ecnh thoi r\u1ed7ng<\/td>\n<td>To\u00e0n th\u1ec3-Ph\u1ea7n (Y\u1ebfu)<\/td>\n<td>\u0110\u1ed9c l\u1eadp<\/td>\n<\/tr>\n<tr>\n<td>Th\u00e0nh ph\u1ea7n<\/td>\n<td>H\u00ecnh thoi li\u1ec1n<\/td>\n<td>To\u00e0n th\u1ec3-Ph\u1ea7n (M\u1ea1nh)<\/td>\n<td>Ph\u1ee5 thu\u1ed9c<\/td>\n<\/tr>\n<tr>\n<td>K\u1ebf th\u1eeba<\/td>\n<td>M\u0169i t\u00ean tam gi\u00e1c<\/td>\n<td>M\u1ed1i quan h\u1ec7 L\u00e0-M\u1ed9t<\/td>\n<td>Kh\u00f4ng \u00e1p d\u1ee5ng<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ee5 thu\u1ed9c<\/td>\n<td>M\u0169i t\u00ean g\u1ea1ch \u0111\u1ee9t<\/td>\n<td>M\u1ed1i quan h\u1ec7 D\u00f9ng-M\u1ed9t<\/td>\n<td>T\u1ea1m th\u1eddi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0110a d\u1ea1ng v\u00e0 B\u1ed9i s\u1ed1 \ud83d\udcd0<\/h2>\n<p>\u0110a d\u1ea1ng x\u00e1c \u0111\u1ecbnh c\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t l\u1edbp li\u00ean quan \u0111\u1ebfn bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp kh\u00e1c. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng m\u1ed9t kho\u1ea3ng c\u00e1ch g\u1ea7n c\u00e1c \u0111\u1ea7u c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7.<\/p>\n<ul>\n<li><strong>1:<\/strong>Ch\u00ednh x\u00e1c m\u1ed9t.<\/li>\n<li><strong>0..1:<\/strong>Kh\u00f4ng ho\u1eb7c m\u1ed9t (t\u00f9y ch\u1ecdn).<\/li>\n<li><strong>1..*:<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u h\u01a1n (b\u1eaft bu\u1ed9c).<\/li>\n<li><strong>0..*:<\/strong>Kh\u00f4ng ho\u1eb7c nhi\u1ec1u h\u01a1n (t\u1eadp h\u1ee3p t\u00f9y ch\u1ecdn).<\/li>\n<li><strong>n:<\/strong> M\u1ed9t s\u1ed1 c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 t\u00ecnh hu\u1ed1ng:<\/strong> X\u00e9t m\u1ed9t <code>Th\u01b0 vi\u1ec7n<\/code> v\u00e0 m\u1ed9t <code>S\u00e1ch<\/code>.<\/p>\n<ul>\n<li>M\u1ed9t Th\u01b0 vi\u1ec7n ph\u1ea3i c\u00f3 \u00edt nh\u1ea5t m\u1ed9t S\u00e1ch (<code>1..*<\/code>).<\/li>\n<li>M\u1ed9t cu\u1ed1n s\u00e1ch thu\u1ed9c v\u1ec1 \u0111\u00fang m\u1ed9t Th\u01b0 vi\u1ec7n (<code>1<\/code>).<\/li>\n<\/ul>\n<p>X\u00e1c \u0111\u1ecbnhMultiplicity \u0111\u00fang c\u00e1ch gi\u00fap ng\u0103n ng\u1eeba l\u1ed7i logic. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t m\u1ed1i quan h\u1ec7 l\u00e0 0..1 nh\u01b0ng m\u00e3 c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u \u00edt nh\u1ea5t m\u1ed9t, b\u1ea1n s\u1ebd g\u1eb7p l\u1ed7i tham chi\u1ebfu null.<\/p>\n<h2>Giao di\u1ec7n v\u00e0 L\u1edbp tr\u1eebu t\u01b0\u1ee3ng \ud83e\udde9<\/h2>\n<p>Kh\u00f4ng ph\u1ea3i l\u1edbp n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c t\u1ea1o th\u1ec3 hi\u1ec7n. M\u1ed9t s\u1ed1 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1eabu ho\u1eb7c h\u1ee3p \u0111\u1ed3ng.<\/p>\n<h3>L\u1edbp tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n<p>M\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o th\u1ec3 hi\u1ec7n tr\u1ef1c ti\u1ebfp. N\u00f3 cung c\u1ea5p m\u1ed9t tri\u1ec3n khai c\u01a1 s\u1edf cho c\u00e1c l\u1edbp con. Trong s\u01a1 \u0111\u1ed3, t\u00ean l\u1edbp th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng<em>in nghi\u00eang<\/em> ho\u1eb7c \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng t\u1eeb kh\u00f3a<code>{tr\u1eebu t\u01b0\u1ee3ng}<\/code>.<\/p>\n<ul>\n<li>D\u00f9ng \u0111\u1ec3 chia s\u1ebb h\u00e0nh vi gi\u1eefa m\u1ed9t nh\u00f3m l\u1edbp.<\/li>\n<li>C\u00f3 th\u1ec3 ch\u1ee9a c\u1ea3 ph\u01b0\u01a1ng th\u1ee9c tr\u1eebu t\u01b0\u1ee3ng (kh\u00f4ng c\u00f3 th\u00e2n) v\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u1ee5 th\u1ec3 (c\u00f3 th\u00e2n).<\/li>\n<\/ul>\n<h3>Giao di\u1ec7n<\/h3>\n<p>M\u1ed9t giao di\u1ec7n x\u00e1c \u0111\u1ecbnh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 m\u1ed9t l\u1edbp ph\u1ea3i tri\u1ec3n khai. N\u00f3 kh\u00f4ng l\u01b0u tr\u1eef tr\u1ea1ng th\u00e1i (thu\u1ed9c t\u00ednh).<\/p>\n<ul>\n<li>D\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t h\u1ee3p \u0111\u1ed3ng gi\u1eefa c\u00e1c l\u1edbp kh\u00f4ng li\u00ean quan.<\/li>\n<li>Trong s\u01a1 \u0111\u1ed3, th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u1ed9p l\u1edbp v\u1edbi t\u1eeb kh\u00f3a<code>{giao di\u1ec7n}<\/code> ho\u1eb7c bi\u1ec3u t\u01b0\u1ee3ng ki\u1ec3u d\u00e1ng.<\/li>\n<li>Cho ph\u00e9p \u0111a h\u00ecnh, n\u01a1i c\u00e1c l\u1edbp kh\u00e1c nhau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd m\u1ed9t c\u00e1ch \u0111\u1ed3ng nh\u1ea5t.<\/li>\n<\/ul>\n<p>Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 r\u1ea5t quan tr\u1ecdng. D\u00f9ng giao di\u1ec7n khi b\u1ea1n c\u1ea7n h\u00e0nh vi chung gi\u1eefa c\u00e1c lo\u1ea1i kh\u00e1c nhau. D\u00f9ng l\u1edbp tr\u1eebu t\u01b0\u1ee3ng khi b\u1ea1n c\u1ea7n chia s\u1ebb m\u00e3 v\u00e0 tr\u1ea1ng th\u00e1i.<\/p>\n<h2>C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho ng\u01b0\u1eddi m\u1edbi \ud83c\udf93<\/h2>\n<p>Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n v\u1eabn h\u1eefu \u00edch v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n<ul>\n<li><strong>\u0110\u01a1n gi\u1ea3n h\u00f3a n\u00f3:<\/strong> \u0110\u1eebng 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. Chia nh\u1ecf th\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng con ho\u1eb7c g\u00f3i.<\/li>\n<li><strong>T\u1eadp trung v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu:<\/strong> \u0110\u1eebng bao g\u1ed3m t\u1eebng ph\u01b0\u01a1ng th\u1ee9c m\u1ed9t. Ch\u1ec9 bao g\u1ed3m nh\u1eefng ph\u01b0\u01a1ng th\u1ee9c quan tr\u1ecdng nh\u1ea5t \u0111\u1ecbnh ngh\u0129a h\u00e0nh vi c\u1ee7a l\u1edbp.<\/li>\n<li><strong>T\u00ean g\u1ecdi nh\u1ea5t qu\u00e1n:<\/strong> Tu\u00e2n th\u1ee7 quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean nghi\u00eam ng\u1eb7t. N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng <code>camelCase<\/code> cho c\u00e1c thu\u1ed9c t\u00ednh, h\u00e3y s\u1eed d\u1ee5ng n\u00f3 \u1edf m\u1ecdi n\u01a1i.<\/li>\n<li><strong>Xem x\u00e9t th\u01b0\u1eddng xuy\u00ean:<\/strong> Khi m\u00e3 ngu\u1ed3n ph\u00e1t tri\u1ec3n, s\u01a1 \u0111\u1ed3 c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt theo. M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1ed7i th\u1eddi c\u00f2n t\u1ec7 h\u01a1n c\u1ea3 kh\u00f4ng c\u00f3 s\u01a1 \u0111\u1ed3.<\/li>\n<li><strong>S\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 m\u1ed9t c\u00e1ch kh\u00f4n ngoan:<\/strong> S\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m v\u1ebd s\u01a1 \u0111\u1ed3 \u0111\u1ec3 duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n, nh\u01b0ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng logic xu\u1ea5t ph\u00e1t t\u1eeb tr\u00ed \u00f3c c\u1ee7a b\u1ea1n, ch\u1ee9 kh\u00f4ng ph\u1ea3i t\u1eeb c\u00f4ng c\u1ee5.<\/li>\n<\/ul>\n<h2>Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \ud83d\udeab<\/h2>\n<p>Ngay c\u1ea3 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc l\u1ed7i khi m\u00f4 h\u00ecnh h\u00f3a. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m th\u1eddi gian khi t\u00e1i c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n.<\/p>\n<ul>\n<li><strong>Tr\u1ed9n l\u1eabn Aggregation v\u00e0 Composition:<\/strong> Ch\u00fang th\u01b0\u1eddng b\u1ecb nh\u1ea7m l\u1eabn. H\u00e3y nh\u1edb: n\u1ebfu ph\u1ea7n t\u1eed ch\u1ebft c\u00f9ng v\u1edbi to\u00e0n b\u1ed9, th\u00ec \u0111\u00f3 l\u00e0 Composition. N\u1ebfu ph\u1ea7n t\u1eed t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp, th\u00ec \u0111\u00f3 l\u00e0 Aggregation.<\/li>\n<li><strong>Qu\u00e1 m\u1ee9c thi\u1ebft k\u1ebf:<\/strong> \u0110\u1eebng t\u1ea1o c\u00e1c c\u1ea5u tr\u00fac k\u1ebf th\u1eeba s\u00e2u (\u00d4ng n\u1ed9i \u2192 B\u1ed1 \u2192 Con trai \u2192 Con ch\u00e1u). \u0110i\u1ec1u n\u00e0y khi\u1ebfn m\u00e3 ngu\u1ed3n c\u1ee9ng nh\u1eafc v\u00e0 kh\u00f3 thay \u0111\u1ed5i.<\/li>\n<li><strong>B\u1ecf qua t\u00ednh \u0111a d\u1ea1ng:<\/strong> B\u1ecf qu\u00ean vi\u1ec7c x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 m\u01a1 h\u1ed3 trong tri\u1ec3n khai m\u00e3 ngu\u1ed3n.<\/li>\n<li><strong>Ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n:<\/strong> Tr\u00e1nh t\u00ecnh hu\u1ed1ng Class A ph\u1ee5 thu\u1ed9c v\u00e0o Class B, v\u00e0 Class B l\u1ea1i ph\u1ee5 thu\u1ed9c v\u00e0o Class A. \u0110i\u1ec1u n\u00e0y t\u1ea1o th\u00e0nh m\u1ed9t v\u00f2ng l\u1eb7p khi\u1ebfn vi\u1ec7c kh\u1edfi t\u1ea1o tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p.<\/li>\n<\/ul>\n<h2>T\u1eeb s\u01a1 \u0111\u1ed3 \u0111\u1ebfn m\u00e3 ngu\u1ed3n \ud83d\udcbb<\/h2>\n<p>B\u01b0\u1edbc cu\u1ed1i c\u00f9ng l\u00e0 chuy\u1ec3n \u0111\u1ed5i m\u00f4 h\u00ecnh tr\u1ef1c quan th\u00e0nh m\u00e3 ngu\u1ed3n th\u1ef1c t\u1ebf. Qu\u00e1 tr\u00ecnh n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cthi\u1ebft k\u1ebf ng\u01b0\u1ee3c\u201d.<\/p>\n<ul>\n<li><strong>T\u1ea1o m\u00e3 ngu\u1ed3n:<\/strong> Nhi\u1ec1u c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 t\u1ea1o m\u00e3 khung t\u1eeb s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf ng\u01b0\u1ee3c:<\/strong> B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 t\u1ea1o s\u01a1 \u0111\u1ed3 t\u1eeb m\u00e3 ngu\u1ed3n hi\u1ec7n c\u00f3 \u0111\u1ec3 t\u00e0i li\u1ec7u h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng c\u0169.<\/li>\n<li><strong>B\u1ea3n \u0111\u1ed3 th\u1ee7 c\u00f4ng:<\/strong> \u0110\u00f4i khi, b\u1ea3n \u0111\u1ed3 th\u1ee7 c\u00f4ng l\u1ea1i t\u1ed1t h\u01a1n. B\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n t\u00e1i c\u1ea5u tr\u00fac s\u01a1 \u0111\u1ed3 \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c t\u00ednh n\u0103ng ng\u00f4n ng\u1eef m\u00e0 b\u1ea1n \u0111ang s\u1eed d\u1ee5ng.<\/li>\n<\/ul>\n<p>\u0110\u1ea3m b\u1ea3o c\u00e1c m\u00f4 t\u1ea3 quy\u1ec1n truy c\u1eadp trong m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n kh\u1edbp v\u1edbi c\u00e1c k\u00fd hi\u1ec7u trong s\u01a1 \u0111\u1ed3. C\u00e1c thu\u1ed9c t\u00ednh ri\u00eang t\u01b0 trong s\u01a1 \u0111\u1ed3 ph\u1ea3i l\u00e0 ri\u00eang t\u01b0 trong m\u00e3 ngu\u1ed3n. S\u1ef1 \u0111\u1ed3ng b\u1ed9 n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n<h2>K\u1ebft lu\u1eadn: X\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc \ud83d\ude80<\/h2>\n<p>Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 v\u1ebd c\u00e1c h\u00ecnh h\u1ed9p v\u00e0 \u0111\u01b0\u1eddng k\u1ebb. \u0110\u00f3 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh suy ngh\u0129 bu\u1ed9c b\u1ea1n ph\u1ea3i x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac ph\u1ea7n m\u1ec1m tr\u01b0\u1edbc khi x\u00e2y d\u1ef1ng. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n, m\u1ed1i quan h\u1ec7 v\u00e0 quy t\u1eafc \u0111\u01b0\u1ee3c n\u00eau trong h\u01b0\u1edbng d\u1eabn n\u00e0y, b\u1ea1n s\u1ebd thi\u1ebft l\u1eadp \u0111\u01b0\u1ee3c n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc cho c\u00e1c d\u1ef1 \u00e1n c\u1ee7a m\u00ecnh.<\/p>\n<p>B\u1eaft \u0111\u1ea7u t\u1eeb nh\u1ecf. M\u00f4 h\u00ecnh h\u00f3a m\u1ed9t l\u1edbp \u0111\u01a1n gi\u1ea3n. Th\u00eam thu\u1ed9c t\u00ednh. Th\u00eam ph\u01b0\u01a1ng th\u1ee9c. K\u1ebft n\u1ed1i v\u1edbi m\u1ed9t l\u1edbp kh\u00e1c. T\u1eeb t\u1eeb t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p. C\u00e1ch ti\u1ebfp c\u1eadn l\u1eb7p l\u1ea1i n\u00e0y gi\u00fap b\u1ea1n h\u1ecdc \u0111\u01b0\u1ee3c nh\u1eefng tinh t\u1ebf c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 kh\u00f4ng b\u1ecb cho\u00e1ng ng\u1ee3p.<\/p>\n<p>H\u00e3y nh\u1edb, m\u1ee5c ti\u00eau l\u00e0 s\u1ef1 r\u00f5 r\u00e0ng. M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp t\u1ed1t truy\u1ec1n \u0111\u1ea1t m\u1ee5c \u0111\u00edch r\u00f5 r\u00e0ng \u0111\u1ebfn c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n kh\u00e1c. N\u00f3 gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 v\u00e0 t\u1ea1o n\u1ec1n t\u1ea3ng cho m\u00e3 ngu\u1ed3n m\u1ea1nh m\u1ebd, d\u1ec5 b\u1ea3o tr\u00ec. H\u00e3y d\u00e0nh th\u1eddi gian, tu\u00e2n th\u1ee7 c\u00e1c chu\u1ea9n m\u1ef1c, v\u00e0 b\u1ea1n s\u1ebd th\u1ea5y qu\u00e1 tr\u00ecnh l\u1eadp tr\u00ecnh c\u1ee7a m\u00ecnh tr\u1edf n\u00ean c\u00f3 c\u1ea5u tr\u00fac v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Khi b\u1eaft \u0111\u1ea7u m\u1ed9t d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m m\u1edbi, b\u01b0\u1edbc quan tr\u1ecdng nh\u1ea5t th\u01b0\u1eddng x\u1ea3y ra tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 n\u00e0o. B\u01b0\u1edbc n\u00e0y bao g\u1ed3m vi\u1ec7c l\u00ean&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1151,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u01b0\u1edbng d\u1eabn c\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u \ud83d\udcca UML","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 l\u1edbp, m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t c\u1ee7a UML. 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