{"id":533,"date":"2026-08-14T08:16:11","date_gmt":"2026-08-14T08:16:11","guid":{"rendered":"https:\/\/www.ai-diagrams.com\/vn\/1106-2\/"},"modified":"2026-09-03T15:28:09","modified_gmt":"2026-09-03T15:28:09","slug":"1106-2","status":"publish","type":"post","link":"https:\/\/www.ai-diagrams.com\/vn\/1106-2\/","title":{"rendered":"L\u00e0m ch\u1ee7 M\u00f4 h\u00ecnh h\u00f3a Bi\u1ec3u \u0111\u1ed3 L\u1edbp: Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a, M\u1ed1i quan h\u1ec7 v\u00e0 C\u00e1c quy t\u1eafc v\u1ec1 T\u00ednh g\u1eafn k\u1ebft"},"content":{"rendered":"

Gi\u1edbi thi\u1ec7u<\/h2>\n

Trong k\u1ef9 thu\u1eadt ph\u1ea7n m\u1ec1m h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, Bi\u1ec3u \u0111\u1ed3 L\u1edbp<\/a> l\u00e0 hi\u1ec7n v\u1eadt ph\u1ed5 bi\u1ebfn nh\u1ea5t nh\u01b0ng l\u1ea1i th\u01b0\u1eddng b\u1ecb \u00e1p d\u1ee5ng sai. Th\u01b0\u1eddng b\u1ecb quy gi\u1ea3n th\u00e0nh m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01a1n thu\u1ea7n trong k\u00fd hi\u1ec7u UML ho\u1eb7c \u0111\u01b0\u1ee3c coi l\u00e0 b\u1ea3n \u0111\u1ed3 tr\u1ef1c ti\u1ebfp 1:1 c\u1ee7a c\u1ea5u tr\u00fac m\u00e3, m\u1ed9t Bi\u1ec3u \u0111\u1ed3 L\u1edbp th\u1ef1c s\u1ef1 l\u00e0 m\u1ed9t b\u1ea3n \u0111\u1eb7c t\u1ea3 nghi\u00eam ng\u1eb7t v\u1ec1 c\u1ea5u tr\u00fac t\u0129nh, h\u1ee3p \u0111\u1ed3ng ki\u1ec3u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ng\u1eef ngh\u0129a<\/strong>. N\u00f3 l\u00e0 b\u1ea3n thi\u1ebft k\u1ebf ki\u1ebfn tr\u00fac c\u1ea7u n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c kh\u00e1i ni\u1ec7m mi\u1ec1n nghi\u1ec7p v\u1ee5 v\u00e0 thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 th\u1ef1c thi.<\/p>\n

B\u1ea5t ch\u1ea5p s\u1ef1 th\u1ed1ng tr\u1ecb c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ph\u00e1p lu\u1eadn linh ho\u1ea1t v\u00e0 ph\u00e1t tri\u1ec3n d\u1ef1a tr\u00ean ki\u1ec3m th\u1eed, Bi\u1ec3u \u0111\u1ed3 L\u1edbp<\/a> v\u1eabn l\u00e0 ti\u00eau chu\u1ea9n v\u00e0ng \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a h\u1ee3p \u0111\u1ed3ng API, x\u00e1c th\u1ef1c c\u00e1c m\u00f4 h\u00ecnh mi\u1ec1n v\u1edbi c\u00e1c b\u00ean li\u00ean quan v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u tri\u1ec3n khai. Tuy nhi\u00ean, t\u1ea1o ra m\u1ed9t Bi\u1ec3u \u0111\u1ed3 L\u1edbp chuy\u00ean nghi\u1ec7p \u0111\u00f2i h\u1ecfi nhi\u1ec1u h\u01a1n l\u00e0 ch\u1ec9 v\u1ebd c\u00e1c h\u1ed9p v\u00e0 m\u0169i t\u00ean. N\u00f3 y\u00eau c\u1ea7u tu\u00e2n th\u1ee7 nghi\u00eam ng\u1eb7t c\u00e1c m\u1ee9c tr\u1eebu t\u01b0\u1ee3ng h\u00f3a (Kh\u00e1i ni\u1ec7m, Logic, V\u1eadt l\u00fd), hi\u1ec3u bi\u1ebft ch\u00ednh x\u00e1c v\u1ec1 ng\u1eef ngh\u0129a c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7 (li\u00ean k\u1ebft so v\u1edbi t\u1eadp h\u1ee3p so v\u1edbi t\u1ed5ng h\u1ee3p), v\u00e0 \u00e1p d\u1ee5ng c\u00f3 k\u1ef7 lu\u1eadt c\u00e1c nguy\u00ean t\u1eafc SOLID \u0111\u1ec3 ng\u0103n ng\u1eeba s\u1ef1 suy gi\u1ea3m c\u1ea5u tr\u00fac.<\/p>\n

\"S\u01a1<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p m\u1ed9t t\u00e0i li\u1ec7u tham kh\u1ea3o to\u00e0n di\u1ec7n v\u1ec1 t\u1eeb v\u1ef1ng Bi\u1ec3u \u0111\u1ed3 L\u1edbp, ph\u00e2n c\u1ea5p tr\u1eebu t\u01b0\u1ee3ng h\u00f3a, quy t\u1eafc m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c b\u1ea5t bi\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng. D\u00f9 b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t mi\u1ec1n Qu\u1ea3n l\u00fd \u0110\u01a1n h\u00e0ng ph\u1ee9c t\u1ea1p hay thi\u1ebft k\u1ebf h\u1ee3p \u0111\u1ed3ng API cho vi d\u1ecbch v\u1ee5, c\u00e1c ph\u1ea7n sau \u0111\u00e2y s\u1ebd thi\u1ebft l\u1eadp khung ch\u00ednh x\u00e1c c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra c\u00e1c Bi\u1ec3u \u0111\u1ed3 L\u1edbp c\u00f3 c\u01a1 s\u1edf ph\u00e2n t\u00edch v\u1eefng ch\u1eafc, ki\u1ebfn tr\u00fac v\u1eefng ch\u00e3i v\u00e0 h\u1eefu \u00edch th\u1ef1c t\u1ebf. T\u1ea5t c\u1ea3 c\u00e1c v\u00ed d\u1ee5 \u0111\u1ec1u \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1eb1ng PlantUML, cung c\u1ea5p c\u00e1c \u0111\u1eb7c t\u1ea3 c\u00f3 th\u1ec3 th\u1ef1c thi, c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n v\u00e0 t\u00edch h\u1ee3p v\u00e0o c\u00e1c quy tr\u00ecnh CI\/CD.<\/p>\n\n

1. C\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u1ed1t l\u00f5i: T\u1eeb v\u1ef1ng “Bi\u1ec3u \u0111\u1ed3 L\u1edbp”<\/h2>\n

Tr\u01b0\u1edbc khi \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c m\u1ee9c tr\u1eebu t\u01b0\u1ee3ng h\u00f3a, b\u1ea1n ph\u1ea3i l\u00e0m ch\u1ee7 c\u00e1c y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n. Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y nh\u1ea5t qu\u00e1n trong c\u00e1c ti\u00eau chu\u1ea9n UML 2.x nh\u01b0ng kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3 v\u1ec1 \u00fd \u0111\u1ecbnh ng\u1eef ngh\u0129a<\/em> t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c tr\u1eebu t\u01b0\u1ee3ng h\u00f3a.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Y\u1ebfu t\u1ed1<\/th>\nM\u1ee5c \u0111\u00edch<\/th>\nK\u00fd hi\u1ec7u<\/th>\nR\u00e0ng bu\u1ed9c ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n
L\u1edbp<\/strong><\/td>\nB\u1ea3n thi\u1ebft k\u1ebf cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng; \u0111\u00f3ng g\u00f3i tr\u1ea1ng th\u00e1i (thu\u1ed9c t\u00ednh) v\u00e0 h\u00e0nh vi (ph\u01b0\u01a1ng th\u1ee9c)<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt v\u1edbi 3 ng\u0103n (T\u00ean, Thu\u1ed9c t\u00ednh, Thao t\u00e1c)<\/td>\nT\u00ean ph\u1ea3i l\u00e0 danh t\u1eeb s\u1ed1 \u00edt; thu\u1ed9c t\u00ednh c\u00f3 ki\u1ec3u; t\u00ednh kh\u1ea3 d\u1ee5ng \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u (+, -, #)<\/td>\n<\/tr>\n
Giao di\u1ec7n<\/strong><\/td>\nM\u1ed9t h\u1ee3p \u0111\u1ed3ng quy \u0111\u1ecbnh h\u00e0nh vi m\u00e0 kh\u00f4ng c\u00f3 tri\u1ec3n khai<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt v\u1edbi k\u00fd hi\u1ec7u \u00abinterface\u00bb ho\u1eb7c k\u00fd hi\u1ec7u h\u00ecnh que kem<\/td>\nKh\u00f4ng c\u00f3 thu\u1ed9c t\u00ednh (ngo\u1ea1i tr\u1eeb h\u1eb1ng s\u1ed1); t\u1ea5t c\u1ea3 c\u00e1c thao t\u00e1c \u0111\u1ec1u l\u00e0 c\u00f4ng khai tr\u1eebu t\u01b0\u1ee3ng<\/td>\n<\/tr>\n
Li\u1ec7t k\u00ea<\/strong><\/td>\nM\u1ed9t t\u1eadp h\u1ee3p c\u1ed1 \u0111\u1ecbnh c\u00e1c gi\u00e1 tr\u1ecb c\u00f3 t\u00ean<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt v\u1edbi k\u00fd hi\u1ec7u \u00abenumeration\u00bb<\/td>\nC\u00e1c gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ng\u0103n t\u00ean; th\u01b0\u1eddng kh\u00f4ng c\u00f3 c\u00e1c ph\u00e9p to\u00e1n<\/td>\n<\/tr>\n
Li\u00ean k\u1ebft<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac cho th\u1ea5y c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi s\u1ed1 l\u01b0\u1ee3ng t\u00f9y ch\u1ecdn<\/td>\nPh\u1ea3i c\u00f3 t\u00ean vai tr\u00f2 \u1edf c\u1ea3 hai \u0111\u1ea7u \u0111\u1ec3 r\u00f5 r\u00e0ng; s\u1ed1 l\u01b0\u1ee3ng l\u00e0 b\u1eaft bu\u1ed9c<\/td>\n<\/tr>\n
Tuy\u1ec3n t\u1eadp<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 \u201cc\u00f3 m\u1ed9t\u201d y\u1ebfu; ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh thoi r\u1ed7ng \u1edf \u0111\u1ea7u to\u00e0n th\u1ec3<\/td>\nV\u00f2ng \u0111\u1eddi ph\u1ea7n \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3; c\u00f3 th\u1ec3 c\u00f3 quy\u1ec1n s\u1edf h\u1eefu chung<\/td>\n<\/tr>\n
T\u1ed5 h\u1ee3p<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 \u201cs\u1edf h\u1eefu m\u1ed9t\u201d m\u1ea1nh; ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi h\u00ecnh thoi \u0111\u1ea7y \u1edf \u0111\u1ea7u to\u00e0n th\u1ec3<\/td>\nV\u00f2ng \u0111\u1eddi ph\u1ea7n g\u1eafn li\u1ec1n v\u1edbi to\u00e0n th\u1ec3; quy\u1ec1n s\u1edf h\u1eefu \u0111\u1ed9c quy\u1ec1n<\/td>\n<\/tr>\n
K\u1ebf th\u1eeba<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 \u201cl\u00e0 m\u1ed9t\u201d; l\u1edbp con k\u1ebf th\u1eeba c\u1ea5u tr\u00fac\/h\u00e0nh vi<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n v\u1edbi tam gi\u00e1c r\u1ed7ng ch\u1ec9 v\u1ec1 ph\u00eda l\u1edbp cha<\/td>\nNguy\u00ean l\u00fd thay th\u1ebf Liskov ph\u1ea3i \u0111\u01b0\u1ee3c tu\u00e2n th\u1ee7; tr\u00e1nh c\u00e1c ph\u00e2n c\u1ea5p s\u00e2u<\/td>\n<\/tr>\n
Hi\u1ec7n th\u1ef1c h\u00f3a<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 \u201cth\u1ef1c hi\u1ec7n\u201d; l\u1edbp \u0111\u00e1p \u1ee9ng h\u1ee3p \u0111\u1ed3ng giao di\u1ec7n<\/td>\n\u0110\u01b0\u1eddng \u0111\u1ee9t n\u00e9t v\u1edbi tam gi\u00e1c r\u1ed7ng ch\u1ec9 v\u1ec1 ph\u00eda giao di\u1ec7n<\/td>\nL\u1edbp ph\u1ea3i th\u1ef1c hi\u1ec7n t\u1ea5t c\u1ea3 c\u00e1c ph\u00e9p to\u00e1n c\u1ee7a giao di\u1ec7n<\/td>\n<\/tr>\n
Ph\u1ee5 thu\u1ed9c<\/strong><\/td>\nM\u1ed1i quan h\u1ec7 \u201cs\u1eed d\u1ee5ng\u201d; li\u00ean k\u1ebft t\u1ea1m th\u1eddi ho\u1eb7c y\u1ebfu<\/td>\nM\u0169i t\u00ean h\u1edf \u0111\u1ee9t n\u00e9t<\/td>\nGi\u1ea3m thi\u1ec3u; ch\u1ec9 ra m\u1ee5c ti\u00eau c\u00f3 th\u1ec3 t\u00e1i c\u1ea5u tr\u00fac<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean (Quan tr\u1ecdng cho s\u1ef1 r\u00f5 r\u00e0ng)<\/h3>\n