{"id":1946,"date":"2026-03-22T02:01:37","date_gmt":"2026-03-22T02:01:37","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/understanding-classes-and-objects-simple-ooad-guide\/"},"modified":"2026-03-22T02:01:37","modified_gmt":"2026-03-22T02:01:37","slug":"understanding-classes-and-objects-simple-ooad-guide","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/understanding-classes-and-objects-simple-ooad-guide\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: Hi\u1ec3u \u0111\u01a1n gi\u1ea3n v\u1ec1 L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng"},"content":{"rendered":"
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\"Charcoal<\/figure>\n<\/div>\n

Trong b\u1ed1i c\u1ea3nh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, c\u1ea5u tr\u00fac l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng nh\u1ea5t. Khi c\u00e1c k\u1ef9 s\u01b0 ti\u1ebfp c\u1eadn nh\u1eefng v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p, h\u1ecd kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n vi\u1ebft c\u00e1c d\u00f2ng m\u00e3; h\u1ecd x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng logic. Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOAD) cung c\u1ea5p m\u1ed9t khung n\u1ec1n v\u1eefng ch\u1eafc cho qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng n\u00e0y. \u1ede trung t\u00e2m c\u1ee7a OOAD l\u00e0 hai kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n: l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1eb7c d\u00f9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn c\u00f9ng nhau, ch\u00fang \u0111\u1ea1i di\u1ec7n cho nh\u1eefng kh\u00eda c\u1ea1nh kh\u00e1c nhau trong m\u00f4 h\u00ecnh h\u00f3a ph\u1ea7n m\u1ec1m. Vi\u1ec7c n\u1eafm r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 then ch\u1ed1t \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 duy tr\u00ec v\u00e0 m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111i s\u00e2u v\u00e0o c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y. Ch\u00fang ta s\u1ebd v\u01b0\u1ee3t qua nh\u1eefng \u0111\u1ecbnh ngh\u0129a \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 hi\u1ec3u c\u00e1ch ch\u00fang ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t h\u1ec7 th\u1ed1ng thi\u1ebft k\u1ebf. \u0110\u1ebfn cu\u1ed1i b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u v\u00e0 h\u00e0nh vi t\u01b0\u01a1ng t\u00e1c trong m\u1ed9t m\u00f4 h\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang ta s\u1ebd tr\u00e1nh d\u00f9ng c\u00e1c thu\u1eadt ng\u1eef tr\u1eebu t\u01b0\u1ee3ng khi c\u00f3 th\u1ec3, t\u1eadp trung v\u00e0o \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf v\u00e0 lu\u1ed3ng logic.<\/p>\n

\ud83e\uddf1 Kh\u00e1i ni\u1ec7m v\u1ec1 L\u1edbp<\/h2>\n

L\u1edbp ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t b\u1ea3n v\u1ebd ho\u1eb7c m\u1eabu. N\u00f3 \u0111\u1ecbnh ngh\u0129a c\u1ea5u tr\u00fac v\u00e0 h\u00e0nh vi m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thu\u1ed9c lo\u1ea1i \u0111\u00f3 s\u1ebd s\u1edf h\u1eefu. H\u00e3y h\u00ecnh dung l\u1edbp nh\u01b0 m\u1ed9t c\u00f4ng th\u1ee9c l\u00e0m b\u00e1nh. C\u00f4ng th\u1ee9c t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi b\u1ea5t k\u1ef3 chi\u1ebfc b\u00e1nh n\u00e0o \u0111\u01b0\u1ee3c n\u01b0\u1edbng. N\u00f3 li\u1ec7t k\u00ea c\u00e1c nguy\u00ean li\u1ec7u (thu\u1ed9c t\u00ednh) v\u00e0 c\u00e1c b\u01b0\u1edbc (ph\u01b0\u01a1ng th\u1ee9c) c\u1ea7n thi\u1ebft. Cho \u0111\u1ebfn khi c\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c th\u1ef1c thi, th\u00ec ch\u01b0a c\u00f3 chi\u1ebfc b\u00e1nh n\u00e0o th\u1ef1c s\u1ef1 t\u1ed3n t\u1ea1i.<\/p>\n

V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, m\u1ed9t l\u1edbp l\u00e0 m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u do ng\u01b0\u1eddi d\u00f9ng \u0111\u1ecbnh ngh\u0129a. N\u00f3 \u0111\u00f3ng g\u00f3i c\u1ea3 tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi v\u00e0o m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t. S\u1ef1 \u0111\u00f3ng g\u00f3i n\u00e0y gi\u00fap c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p. Thay v\u00ec theo d\u00f5i t\u1eebng bi\u1ebfn ri\u00eang l\u1ebb r\u1ea3i r\u00e1c trong h\u1ec7 th\u1ed1ng, ch\u00fang ta nh\u00f3m c\u00e1c d\u1eef li\u1ec7u v\u00e0 h\u00e0m li\u00ean quan l\u1ea1i d\u01b0\u1edbi m\u1ed9t t\u00ean duy nh\u1ea5t.<\/p>\n

C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t L\u1edbp<\/h3>\n
    \n
  • Thu\u1ed9c t\u00ednh:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i ho\u1eb7c d\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn l\u1edbp. Trong m\u1ed9t l\u1edbp xe h\u01a1i, c\u00e1c thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 bao g\u1ed3m m\u00e0u s\u1eafc, t\u1ed1c \u0111\u1ed9 v\u00e0 m\u1ee9c nhi\u00ean li\u1ec7u. Nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0y x\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ngl\u00e0<\/em>.<\/li>\n
  • Ph\u01b0\u01a1ng th\u1ee9c:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho h\u00e0nh vi ho\u1eb7c h\u00e0nh \u0111\u1ed9ng m\u00e0 l\u1edbp c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n. M\u1ed9t l\u1edbp xe h\u01a1i c\u00f3 th\u1ec3 c\u00f3 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c nh\u01b0t\u0103ng t\u1ed1c<\/code>, phanh<\/code>, ho\u1eb7cr\u1ebd<\/code>. Nh\u1eefng \u0111i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ngl\u00e0m<\/em>.<\/li>\n
  • H\u00e0m t\u1ea1o:<\/strong> M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u1eb7c bi\u1ec7t d\u00f9ng \u0111\u1ec3 kh\u1edfi t\u1ea1o c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng m\u1edbi. N\u00f3 thi\u1ebft l\u1eadp tr\u1ea1ng th\u00e1i ban \u0111\u1ea7u khi \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u1ea1o ra.<\/li>\n
  • H\u00e0m h\u1ee7y:<\/strong> M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c x\u1eed l\u00fd d\u1ecdn d\u1eb9p khi \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft, \u0111\u1ea3m b\u1ea3o c\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng \u0111\u00fang c\u00e1ch.<\/li>\n<\/ul>\n

    Quan tr\u1ecdng c\u1ea7n l\u01b0u \u00fd r\u1eb1ng m\u1ed9t l\u1edbp b\u1ea3n th\u00e2n n\u00f3 kh\u00f4ng chi\u1ebfm d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u theo c\u00e1ch t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t th\u1ec3 hi\u1ec7n. L\u1edbp ch\u1ec9 chi\u1ebfm b\u1ed9 nh\u1edb cho \u0111\u1ecbnh ngh\u0129a c\u1ee7a n\u00f3. N\u00f3 mang t\u00ednh t\u0129nh cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o. S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y cho ph\u00e9p nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng chia s\u1ebb c\u00f9ng m\u1ed9t logic m\u00e0 kh\u00f4ng c\u1ea7n sao ch\u00e9p m\u00e3 ngu\u1ed3n.<\/p>\n

    \ud83d\udce6 Kh\u00e1i ni\u1ec7m v\u1ec1 \u0110\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

    N\u1ebfu l\u1edbp l\u00e0 b\u1ea3n v\u1ebd, th\u00ec \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 c\u00f4ng tr\u00ecnh. \u0110\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp. Khi b\u1ea1n tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn trong \u0111\u1ecbnh ngh\u0129a l\u1edbp, b\u1ea1n s\u1ebd t\u1ea1o ra m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng trong b\u1ed9 nh\u1edb. C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 nh\u1eefng th\u1ef1c th\u1ec3 ho\u1ea1t \u0111\u1ed9ng, \u0111i\u1ec1u khi\u1ec3n ch\u01b0\u01a1ng tr\u00ecnh. Ch\u00fang l\u01b0u tr\u1eef c\u00e1c gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf cho c\u00e1c thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong l\u1edbp.<\/p>\n

    M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec1u c\u00f3 danh t\u00ednh, tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi ri\u00eang bi\u1ec7t. B\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra m\u01b0\u1eddi \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c nhau t\u1eeb c\u00f9ng m\u1ed9t l\u1edbp xe h\u01a1i. M\u1ed9t chi\u1ebfc c\u00f3 th\u1ec3 m\u00e0u \u0111\u1ecf v\u00e0 nhanh; chi\u1ebfc kh\u00e1c c\u00f3 th\u1ec3 m\u00e0u xanh v\u00e0 ch\u1eadm. Ch\u00fang chia s\u1ebb c\u00f9ng m\u1ed9t c\u1ea5u tr\u00fac (v\u00ec ch\u00fang \u0111\u1ebfn t\u1eeb c\u00f9ng m\u1ed9t l\u1edbp), nh\u01b0ng d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 c\u1ee7a ch\u00fang kh\u00e1c nhau.<\/p>\n

    \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0110\u1ed1i t\u01b0\u1ee3ng<\/h3>\n
      \n
    • \u0110\u1ecbnh danh:<\/strong> M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec1u kh\u00e1c bi\u1ec7t. Ngay c\u1ea3 khi hai \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 c\u00f9ng gi\u00e1 tr\u1ecb d\u1eef li\u1ec7u, ch\u00fang v\u1eabn t\u1ed3n t\u1ea1i \u1edf c\u00e1c v\u1ecb tr\u00ed b\u1ed9 nh\u1edb kh\u00e1c nhau.<\/li>\n
    • Tr\u1ea1ng th\u00e1i:<\/strong> C\u00e1c gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i c\u1ee7a c\u00e1c thu\u1ed9c t\u00ednh. N\u1ebfu m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng n\u00fat b\u1ea5m c\u00f3 thu\u1ed9c t\u00ednh isPressed<\/code> th\u00ec tr\u1ea1ng th\u00e1i s\u1ebd l\u00e0 true ho\u1eb7c false t\u1ea1i b\u1ea5t k\u1ef3 th\u1eddi \u0111i\u1ec3m n\u00e0o.<\/li>\n
    • H\u00e0nh vi:<\/strong> C\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 s\u1eb5n cho \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng giao ti\u1ebfp v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c b\u1eb1ng c\u00e1ch g\u1eedi tin nh\u1eafn (g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c).<\/li>\n<\/ul>\n

      C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c th\u00f4ng qua giao di\u1ec7n. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng c\u1ea7n bi\u1ebft c\u00e1ch \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c ho\u1ea1t \u0111\u1ed9ng b\u00ean trong. N\u00f3 ch\u1ec9 c\u1ea7n bi\u1ebft nh\u1eefng h\u00e0nh \u0111\u1ed9ng n\u00e0o m\u00e0 n\u00f3 c\u00f3 th\u1ec3 y\u00eau c\u1ea7u t\u1eeb \u0111\u1ed1i t\u01b0\u1ee3ng kia. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0 gi\u00fap h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean linh ho\u1ea1t h\u01a1n.<\/p>\n

      \ud83c\udd9a L\u1edbp so v\u1edbi \u0110\u1ed1i t\u01b0\u1ee3ng: So s\u00e1nh tr\u1ef1c ti\u1ebfp<\/h2>\n

      S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra gi\u1eefa hai thu\u1eadt ng\u1eef n\u00e0y. \u0110\u1ec3 l\u00e0m r\u00f5, ch\u00fang ta c\u00f3 th\u1ec3 xem x\u00e9t m\u1ed9t b\u1ea3ng so s\u00e1nh song song. B\u1ea3ng n\u00e0y l\u00e0m n\u1ed5i b\u1eadt nh\u1eefng kh\u00e1c bi\u1ec7t ch\u1ee9c n\u0103ng thi\u1ebft y\u1ebfu cho thi\u1ebft k\u1ebf.<\/p>\n\n\n\n\n\n\n\n\n\n
      T\u00ednh n\u0103ng<\/th>\nL\u1edbp<\/th>\n\u0110\u1ed1i t\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
      \u0110\u1ecbnh ngh\u0129a<\/strong><\/td>\nM\u1eabu ho\u1eb7c B\u1ea3n v\u1ebd<\/td>\nTh\u1ec3 hi\u1ec7n ho\u1eb7c Th\u1ef1c th\u1ec3<\/td>\n<\/tr>\n
      B\u1ed9 nh\u1edb<\/strong><\/td>\nKh\u00f4ng c\u1ea5p ph\u00e1t b\u1ed9 nh\u1edb cho d\u1eef li\u1ec7u<\/td>\nC\u1ea5p ph\u00e1t b\u1ed9 nh\u1edb cho d\u1eef li\u1ec7u c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
      S\u1ed1 l\u01b0\u1ee3ng<\/strong><\/td>\nM\u1ed9t \u0111\u1ecbnh ngh\u0129a duy nh\u1ea5t cho m\u1ed7i lo\u1ea1i<\/td>\nC\u00f3 th\u1ec3 t\u1ea1o nhi\u1ec1u th\u1ec3 hi\u1ec7n<\/td>\n<\/tr>\n
      S\u1ef1 t\u1ed3n t\u1ea1i<\/strong><\/td>\nKh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng<\/td>\nTh\u1ef1c th\u1ec3 c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
      T\u1ea1o l\u1eadp<\/strong><\/td>\nKhai b\u00e1o trong m\u00e3 ngu\u1ed3n<\/td>\nT\u1ea1o th\u1ec3 hi\u1ec7n th\u00f4ng qua h\u00e0m t\u1ea1o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c nh\u1eefng l\u1ed7i ki\u1ebfn tr\u00fac ph\u1ed5 bi\u1ebfn. V\u00ed d\u1ee5, c\u1ed1 g\u1eafng l\u01b0u tr\u1eef d\u1eef li\u1ec7u tr\u1ef1c ti\u1ebfp trong \u0111\u1ecbnh ngh\u0129a l\u1edbp m\u00e0 kh\u00f4ng c\u00f3 th\u1ec3 hi\u1ec7n l\u00e0 m\u1ed9t khi\u1ebfm khuy\u1ebft thi\u1ebft k\u1ebf trong h\u1ea7u h\u1ebft c\u00e1c ng\u1eef c\u1ea3nh. D\u1eef li\u1ec7u thu\u1ed9c v\u1ec1 \u0111\u1ed1i t\u01b0\u1ee3ng; c\u1ea5u tr\u00fac thu\u1ed9c v\u1ec1 l\u1edbp.<\/p>\n

      \ud83d\udd11 B\u1ed1n tr\u1ee5 c\u1ed9t c\u1ee7a h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

      L\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng ph\u1ea3i l\u00e0 nh\u1eefng kh\u00e1i ni\u1ec7m t\u00e1ch bi\u1ec7t; ch\u00fang ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c \u0111i\u1ec1u ph\u1ed1i b\u1edfi b\u1ed1n nguy\u00ean t\u1eafc then ch\u1ed1t. Nh\u1eefng tr\u1ee5 c\u1ed9t n\u00e0y h\u01b0\u1edbng d\u1eabn c\u00e1ch ch\u00fang ta thi\u1ebft k\u1ebf c\u00e1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c l\u1edbp.<\/p>\n

      1. Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a<\/h3>\n

      Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a l\u00e0 vi\u1ec7c gom d\u1eef li\u1ec7u c\u00f9ng v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c thao t\u00e1c tr\u00ean d\u1eef li\u1ec7u \u0111\u00f3. N\u00f3 h\u1ea1n ch\u1ebf truy c\u1eadp tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00f4ng qua c\u00e1c b\u1ed9 gi\u1edbi h\u1ea1n truy c\u1eadp (public, private, protected).<\/p>\n

        \n
      • B\u1ea3o v\u1ec7:<\/strong>Ng\u0103n c\u1ea3n m\u00e3 b\u00ean ngo\u00e0i thi\u1ebft l\u1eadp tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng th\u00e0nh m\u1ed9t gi\u00e1 tr\u1ecb kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n
      • Ki\u1ec3m so\u00e1t:<\/strong>Cho ph\u00e9p l\u1edbp ki\u1ec3m tra d\u1eef li\u1ec7u tr\u01b0\u1edbc khi ch\u1ea5p nh\u1eadn n\u00f3.<\/li>\n
      • T\u00ednh linh ho\u1ea1t:<\/strong>B\u1ea3n ch\u1ea5t n\u1ed9i b\u1ed9 c\u00f3 th\u1ec3 thay \u0111\u1ed5i m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u00e3 b\u00ean ngo\u00e0i s\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n

        2. Tr\u1eebu t\u01b0\u1ee3ng<\/h3>\n

        Tr\u1eebu t\u01b0\u1ee3ng bao g\u1ed3m vi\u1ec7c che gi\u1ea5u c\u00e1c chi ti\u1ebft tri\u1ec3n khai ph\u1ee9c t\u1ea1p v\u00e0 ch\u1ec9 hi\u1ec3n th\u1ecb nh\u1eefng t\u00ednh n\u0103ng c\u1ea7n thi\u1ebft c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng. Khi b\u1ea1n s\u1eed d\u1ee5ng m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n, b\u1ea1n quan t\u00e2m \u0111\u1ebfn vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n v\u00e0 t\u0103ng t\u1ed1c, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u01a1 ch\u1ebf \u0111\u1ed1t ch\u00e1y b\u00ean trong \u0111\u1ed9ng c\u01a1.<\/p>\n

          \n
        • \u0110\u01a1n gi\u1ea3n:<\/strong>Gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p cho ng\u01b0\u1eddi d\u00f9ng l\u1edbp.<\/li>\n
        • Giao di\u1ec7n:<\/strong>\u0110\u1ecbnh ngh\u0129a m\u1ed9t h\u1ee3p \u0111\u1ed3ng m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i tu\u00e2n theo.<\/li>\n
        • T\u1eadp trung:<\/strong>Cho ph\u00e9p nh\u00e0 ph\u00e1t tri\u1ec3n t\u1eadp trung v\u00e0o logic c\u1ea5p cao thay v\u00ec chi ti\u1ebft c\u1ea5p th\u1ea5p.<\/li>\n<\/ul>\n

          3. K\u1ebf th\u1eeba<\/h3>\n

          K\u1ebf th\u1eeba cho ph\u00e9p m\u1ed9t l\u1edbp m\u1edbi k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 h\u00e0nh vi t\u1eeb m\u1ed9t l\u1edbp hi\u1ec7n c\u00f3. L\u1edbp m\u1edbi l\u00e0 l\u1edbp con (child), v\u00e0 l\u1edbp hi\u1ec7n c\u00f3 l\u00e0 l\u1edbp cha (parent).<\/p>\n

            \n
          • Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng:<\/strong>M\u00e3 chung \u0111\u01b0\u1ee3c vi\u1ebft m\u1ed9t l\u1ea7n trong l\u1edbp cha.<\/li>\n
          • Th\u1ee9 b\u1eadc:<\/strong>T\u1ea1o ra m\u1ed9t ph\u00e2n lo\u1ea1i logic v\u1ec1 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u.<\/li>\n
          • M\u1edf r\u1ed9ng:<\/strong>L\u1edbp con c\u00f3 th\u1ec3 th\u00eam c\u00e1c t\u00ednh n\u0103ng m\u1edbi ho\u1eb7c ghi \u0111\u00e8 c\u00e1c t\u00ednh n\u0103ng hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

            4. \u0110a h\u00ecnh<\/h3>\n

            \u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thu\u1ed9c c\u00e1c ki\u1ec3u kh\u00e1c nhau \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t ki\u1ec3u si\u00eau chung. C\u00f9ng m\u1ed9t th\u00f4ng \u0111i\u1ec7p c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c nhau, v\u00e0 m\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd ph\u1ea3n h\u1ed3i theo c\u00e1ch ri\u00eang c\u1ee7a n\u00f3.<\/p>\n

              \n
            • T\u00ednh linh ho\u1ea1t:<\/strong>M\u00e3 c\u00f3 th\u1ec3 x\u1eed l\u00fd nhi\u1ec1u ki\u1ec3u m\u00e0 kh\u00f4ng c\u1ea7n ki\u1ec3m tra ki\u1ec3u r\u00f5 r\u00e0ng.<\/li>\n
            • Kh\u1ea3 n\u0103ng thay th\u1ebf:<\/strong>C\u00e1c tri\u1ec3n khai kh\u00e1c nhau c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay th\u1ebf m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng.<\/li>\n
            • Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>C\u00e1c ki\u1ec3u m\u1edbi c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

              \ud83d\udd17 M\u1ed1i quan h\u1ec7 v\u00e0 li\u00ean k\u1ebft<\/h2>\n

              C\u00e1c l\u1edbp hi\u1ebfm khi t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Ch\u00fang li\u00ean k\u1ebft v\u1edbi nhau. Hi\u1ec3u r\u00f5 c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c.<\/p>\n

              C\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7<\/h3>\n
                \n
              • Li\u00ean k\u1ebft:<\/strong>M\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac trong \u0111\u00f3 m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi l\u1edbp kh\u00e1c. V\u00ed d\u1ee5: M\u1ed9t Sinh vi\u00ean<\/code> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t Kh\u00f3a h\u1ecdc<\/code>.<\/li>\n
              • Aggregation (T\u1ed5ng h\u1ee3p):<\/strong>M\u1ed9t lo\u1ea1i li\u00ean k\u1ebft c\u1ee5 th\u1ec3 th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 \u201cto\u00e0n th\u1ec3-ph\u1ea7n\u201d, trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. V\u00ed d\u1ee5: M\u1ed9t Th\u01b0 vi\u1ec7n<\/code> c\u00f3 S\u00e1ch<\/code>. N\u1ebfu th\u01b0 vi\u1ec7n \u0111\u00f3ng c\u1eeda, c\u00e1c cu\u1ed1n s\u00e1ch v\u1eabn t\u1ed3n t\u1ea1i.<\/li>\n
              • Th\u00e0nh ph\u1ea7n (Composition):<\/strong>M\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a t\u1ed5ng h\u1ee3p, n\u01a1i ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. V\u00ed d\u1ee5: M\u1ed9t Ng\u00f4i nh\u00e0<\/code> c\u00f3 Ph\u00f2ng<\/code>. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 h\u1ee7y, 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.<\/li>\n
              • K\u1ebf th\u1eeba:<\/strong> Nh\u01b0 \u0111\u00e3 n\u00f3i, m\u1ed1i quan h\u1ec7 \u201cl\u00e0 m\u1ed9t\u201d. M\u1ed9t Xe t\u1ea3i<\/code> l\u00e0 m\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng<\/code>.<\/li>\n<\/ul>\n

                \u2699\ufe0f Thi\u1ebft k\u1ebf c\u00e1c l\u1edbp hi\u1ec7u qu\u1ea3<\/h2>\n

                Vi\u1ec7c t\u1ea1o ra m\u1ed9t l\u1edbp kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 \u0111\u1eb7t t\u00ean cho c\u00e1c thu\u1ed9c t\u00ednh. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 suy ngh\u0129 v\u1ec1 tr\u00e1ch nhi\u1ec7m. M\u1ed9t l\u1edbp n\u00ean c\u00f3 m\u1ed9t m\u1ee5c \u0111\u00edch duy nh\u1ea5t v\u00e0 r\u00f5 r\u00e0ng.<\/p>\n

                Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t<\/h3>\n

                M\u1ed9t l\u1edbp ch\u1ec9 n\u00ean c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. N\u1ebfu m\u1ed9t l\u1edbp x\u1eed l\u00fd c\u1ea3 l\u01b0u tr\u1eef c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 hi\u1ec3n th\u1ecb giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, n\u00f3 s\u1ebd tr\u1edf n\u00ean d\u1ec5 b\u1ecb l\u1ed7i. Nh\u1eefng thay \u0111\u1ed5i trong giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng logic c\u01a1 s\u1edf d\u1eef li\u1ec7u. T\u00e1ch bi\u1ec7t c\u00e1c v\u1ea5n \u0111\u1ec1 s\u1ebd gi\u00fap h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/p>\n

                T\u00ednh g\u1eafn k\u1ebft cao<\/h3>\n

                T\u00ednh g\u1eafn k\u1ebft \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 li\u00ean quan gi\u1eefa c\u00e1c tr\u00e1ch nhi\u1ec7m c\u1ee7a m\u1ed9t l\u1edbp. T\u00ednh g\u1eafn k\u1ebft cao c\u00f3 ngh\u0129a l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c v\u00e0 d\u1eef li\u1ec7u trong l\u1edbp c\u00f9ng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ed9t m\u1ee5c ti\u00eau c\u1ee5 th\u1ec3. T\u00ednh g\u1eafn k\u1ebft th\u1ea5p d\u1eabn \u0111\u1ebfn c\u00e1c ‘\u0111\u1ed1i t\u01b0\u1ee3ng Ch\u00faa’ l\u00e0m qu\u00e1 nhi\u1ec1u vi\u1ec7c.<\/p>\n

                T\u00ednh li\u00ean k\u1ebft th\u1ea5p<\/h3>\n

                T\u00ednh li\u00ean k\u1ebft \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 ph\u1ee5 thu\u1ed9c l\u1eabn nhau gi\u1eefa c\u00e1c module ph\u1ea7n m\u1ec1m. B\u1ea1n mu\u1ed1n c\u00f3 t\u00ednh li\u00ean k\u1ebft th\u1ea5p. N\u1ebfu l\u1edbp A ph\u1ee5 thu\u1ed9c m\u1ea1nh v\u00e0o c\u00e1ch tri\u1ec3n khai n\u1ed9i b\u1ed9 c\u1ee7a l\u1edbp B, th\u00ec m\u1ed9t thay \u0111\u1ed5i \u1edf B s\u1ebd l\u00e0m h\u1ecfng A. Thay v\u00e0o \u0111\u00f3, l\u1edbp A n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t giao di\u1ec7n ho\u1eb7c h\u1ee3p \u0111\u1ed3ng tr\u1eebu t\u01b0\u1ee3ng do B cung c\u1ea5p.<\/p>\n

                \ud83d\udc1b Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong m\u00f4 h\u00ecnh h\u00f3a<\/h2>\n

                Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi \u00e1p d\u1ee5ng c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m n\u00e0y s\u1ebd gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c n\u1ee3 k\u1ef9 thu\u1eadt.<\/p>\n

                  \n
                • Thi\u1ebft k\u1ebf qu\u00e1 m\u1ee9c:<\/strong>T\u1ea1o ra c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p l\u1edbp s\u00e2u s\u1eafc cho nh\u1eefng v\u1ea5n \u0111\u1ec1 \u0111\u01a1n gi\u1ea3n. Kh\u00f4ng ph\u1ea3i m\u1ecdi t\u00ednh n\u0103ng n\u00e0o c\u0169ng c\u1ea7n m\u1ed9t l\u1edbp ri\u00eang bi\u1ec7t. C\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u \u0111\u01a1n gi\u1ea3n th\u01b0\u1eddng \u0111\u1ee7 d\u00f9ng cho c\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01a1n gi\u1ea3n.<\/li>\n
                • L\u1edbp Ch\u00faa:<\/strong>C\u00e1c l\u1edbp ch\u1ee9a qu\u00e1 nhi\u1ec1u logic v\u00e0 d\u1eef li\u1ec7u. Ch\u00fang tr\u1edf n\u00ean kh\u00f3 ki\u1ec3m th\u1eed v\u00e0 b\u1ea3o tr\u00ec. H\u00e3y chia nh\u1ecf ch\u00fang th\u00e0nh c\u00e1c l\u1edbp nh\u1ecf h\u01a1n, t\u1eadp trung v\u00e0o m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3.<\/li>\n
                • \u0110\u1ed1i t\u01b0\u1ee3ng truy\u1ec1n d\u1eef li\u1ec7u:<\/strong>S\u1eed d\u1ee5ng c\u00e1c l\u1edbp ch\u1ec9 nh\u01b0 nh\u1eefng t\u00fai ch\u1ee9a d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u00f3 h\u00e0nh vi. D\u00f9 \u0111\u00f4i khi c\u1ea7n thi\u1ebft, c\u00e1c l\u1edbp v\u1ec1 l\u00fd t\u01b0\u1edfng n\u00ean ki\u1ec3m so\u00e1t tr\u1ea1ng th\u00e1i c\u1ee7a ch\u00ednh ch\u00fang th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n
                • Ph\u1ee5 thu\u1ed9c v\u00f2ng:<\/strong>L\u1edbp A ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp B, v\u00e0 l\u1edbp B ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp A. \u0110i\u1ec1u n\u00e0y t\u1ea1o th\u00e0nh m\u1ed9t v\u00f2ng l\u1eb7p khi\u1ebfn vi\u1ec7c kh\u1edfi t\u1ea1o v\u00e0 ki\u1ec3m th\u1eed tr\u1edf n\u00ean kh\u00f3 kh\u0103n.<\/li>\n
                • B\u1ecf qua t\u00ednh b\u1ea5t bi\u1ebfn:<\/strong>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00f3 th\u1ec3 b\u1ecb thay \u0111\u1ed5i m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd. Thi\u1ebft k\u1ebf c\u00e1c l\u1edbp tr\u1edf n\u00ean b\u1ea5t bi\u1ebfn khi c\u00f3 th\u1ec3 s\u1ebd gi\u1ea3m thi\u1ec3u c\u00e1c t\u00e1c d\u1ee5ng ph\u1ee5 v\u00e0 l\u1ed7i.<\/li>\n<\/ul>\n

                  \ud83e\udde0 S\u1ef1 thay \u0111\u1ed5i t\u01b0 duy<\/h2>\n

                  Chuy\u1ec3n sang t\u01b0 duy h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f2i h\u1ecfi s\u1ef1 thay \u0111\u1ed5i v\u1ec1 g\u00f3c nh\u00ecn. L\u1eadp tr\u00ecnh th\u1ee7 t\u1ee5c t\u1eadp trung v\u00e0o c\u00e1c h\u00e0m v\u00e0 h\u00e0nh \u0111\u1ed9ng. L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng t\u1eadp trung v\u00e0o c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 s\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa ch\u00fang.<\/p>\n

                  Khi thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng, h\u00e3y \u0111\u1eb7t ra nh\u1eefng c\u00e2u h\u1ecfi sau:<\/p>\n

                    \n
                  • Nh\u1eefng th\u1ef1c th\u1ec3 c\u1ed1t l\u00f5i trong l\u0129nh v\u1ef1c n\u00e0y l\u00e0 g\u00ec?<\/li>\n
                  • M\u1ed7i th\u1ef1c th\u1ec3 \u0111ang gi\u1eef tr\u1ea1ng th\u00e1i n\u00e0o?<\/li>\n
                  • M\u1ed7i th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nh\u1eefng h\u00e0nh \u0111\u1ed9ng n\u00e0o?<\/li>\n
                  • C\u00e1c th\u1ef1c th\u1ec3 n\u00e0y giao ti\u1ebfp v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o?<\/li>\n<\/ul>\n

                    Vi\u1ec7c tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y t\u1ef1 nhi\u00ean d\u1eabn \u0111\u1ebfn s\u01a1 \u0111\u1ed3 l\u1edbp. S\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n \u0111\u1ed3 cho vi\u1ec7c tri\u1ec3n khai. N\u00f3 l\u00e0 c\u00f4ng c\u1ee5 giao ti\u1ebfp nhi\u1ec1u nh\u01b0 l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt.<\/p>\n

                    \ud83d\udee0\ufe0f Qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi<\/h2>\n

                    C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 m\u1ed9t v\u00f2ng \u0111\u1eddi. Ch\u00fang \u0111\u01b0\u1ee3c t\u1ea1o ra, s\u1eed d\u1ee5ng v\u00e0 cu\u1ed1i c\u00f9ng b\u1ecb h\u1ee7y. Vi\u1ec7c qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi n\u00e0y l\u00e0 m\u1ed9t ph\u1ea7n trong tr\u00e1ch nhi\u1ec7m thi\u1ebft k\u1ebf.<\/p>\n

                    T\u1ea1o ra<\/h3>\n

                    C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng h\u00e0m t\u1ea1o. H\u00e0m t\u1ea1o \u0111\u1ea3m b\u1ea3o \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eaft \u0111\u1ea7u \u1edf tr\u1ea1ng th\u00e1i h\u1ee3p l\u1ec7. Vi\u1ec7c x\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o \u1edf giai \u0111o\u1ea1n n\u00e0y l\u00e0 m\u1ed9t th\u1ef1c h\u00e0nh t\u1ed1t.<\/p>\n

                    S\u1eed d\u1ee5ng<\/h3>\n

                    Trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng, c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Ch\u00fang trao \u0111\u1ed5i tin nh\u1eafn. Th\u1eddi gian k\u00e9o d\u00e0i c\u1ee7a giai \u0111o\u1ea1n n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o ph\u1ea1m vi c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1ed9t s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed3n t\u1ea1i trong su\u1ed1t th\u1eddi gian ch\u1ea1y c\u1ee7a \u1ee9ng d\u1ee5ng (Singletons). M\u1ed9t s\u1ed1 kh\u00e1c ch\u1ec9 t\u1ed3n t\u1ea1i trong m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3 (\u0111\u1ed1i t\u01b0\u1ee3ng ng\u0103n x\u1ebfp).<\/p>\n

                    H\u1ee7y b\u1ecf<\/h3>\n

                    Khi m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft, n\u00f3 n\u00ean \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf kh\u1ecfi b\u1ed9 nh\u1edb. Trong c\u00e1c ng\u00f4n ng\u1eef c\u00f3 thu gom r\u00e1c, \u0111i\u1ec1u n\u00e0y x\u1ea3y ra t\u1ef1 \u0111\u1ed9ng. Trong qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb th\u1ee7 c\u00f4ng, nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea3i gi\u1ea3i ph\u00f3ng t\u00e0i nguy\u00ean m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng. Vi\u1ec7c kh\u00f4ng l\u00e0m nh\u01b0 v\u1eady s\u1ebd d\u1eabn \u0111\u1ebfn r\u00f2 r\u1ec9 b\u1ed9 nh\u1edb.<\/p>\n

                    \ud83d\ude80 Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y<\/h2>\n

                    Ph\u00e2n t\u00edch v\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea3i ph\u00e1p v\u1ea1n n\u0103ng. N\u00f3 ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p v\u00e0 y\u00eau c\u1ea7u b\u1ea3o tr\u00ec l\u00e2u d\u00e0i.<\/p>\n

                      \n
                    • H\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p:<\/strong> Khi logic qu\u00e1 ph\u1ee9c t\u1ea1p \u0111\u1ec3 x\u1eed l\u00fd b\u1eb1ng c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u01a1n gi\u1ea3n, OOAD cung c\u1ea5p c\u1ea5u tr\u00fac.<\/li>\n
                    • Giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng:<\/strong> C\u00e1c th\u00e0nh ph\u1ea7n giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi.<\/li>\n
                    • M\u00f4 ph\u1ecfng:<\/strong> Vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a c\u00e1c th\u1ef1c th\u1ec3 th\u1ebf gi\u1edbi th\u1ef1c (xe c\u1ed9, con ng\u01b0\u1eddi, m\u00e1y m\u00f3c) ph\u00f9 h\u1ee3p t\u1ed1t v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
                    • H\u1ee3p t\u00e1c nh\u00f3m:<\/strong> C\u00e1c ranh gi\u1edbi l\u1edbp r\u00f5 r\u00e0ng cho ph\u00e9p nhi\u1ec1u nh\u00e0 ph\u00e1t tri\u1ec3n l\u00e0m vi\u1ec7c \u0111\u1ed3ng th\u1eddi tr\u00ean c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n

                      Ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1ed1i v\u1edbi c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u01a1n gi\u1ea3n ho\u1eb7c c\u00e1c lu\u1ed3ng x\u1eed l\u00fd d\u1eef li\u1ec7u, c\u00e1ch ti\u1ebfp c\u1eadn ch\u1ee9c n\u0103ng c\u00f3 th\u1ec3 hi\u1ec7u qu\u1ea3 h\u01a1n. S\u1ef1 l\u1ef1a ch\u1ecdn ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n.<\/p>\n

                      \ud83d\udcdd T\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd<\/h2>\n

                      T\u00f3m l\u1ea1i, nh\u1eefng \u0111i\u1ec3m then ch\u1ed1t cho thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3:<\/p>\n

                        \n
                      • L\u1edbp x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac.<\/strong> Ch\u00fang l\u00e0 c\u00e1c \u0111\u1ecbnh ngh\u0129a tr\u1eebu t\u01b0\u1ee3ng v\u1ec1 d\u1eef li\u1ec7u v\u00e0 logic.<\/li>\n
                      • C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea1i di\u1ec7n cho th\u1ef1c t\u1ebf.<\/strong> Ch\u00fang l\u00e0 c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c.<\/li>\n
                      • Bao \u0111\u00f3ng b\u1ea3o v\u1ec7 tr\u1ea1ng th\u00e1i.<\/strong>Gi\u1eef d\u1eef li\u1ec7u ri\u00eang t\u01b0 v\u00e0 ch\u1ec9 c\u00f4ng khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ea7n thi\u1ebft.<\/li>\n
                      • K\u1ebf th\u1eeba th\u00fac \u0111\u1ea9y t\u00e1i s\u1eed d\u1ee5ng.<\/strong>Chia s\u1ebb logic chung gi\u1eefa c\u00e1c ki\u1ec3u li\u00ean quan.<\/li>\n
                      • \u0110a h\u00ecnh cho ph\u00e9p linh ho\u1ea1t.<\/strong>Vi\u1ebft m\u00e3 ngu\u1ed3n ho\u1ea1t \u0111\u1ed9ng v\u1edbi nhi\u1ec1u ki\u1ec3u kh\u00e1c nhau.<\/li>\n
                      • Gi\u1eef cho c\u00e1c l\u1edbp t\u1eadp trung v\u00e0o m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3.<\/strong>Tr\u00e1nh giao nhi\u1ec7m v\u1ee5 r\u1ed9ng r\u00e3i cho m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t.<\/li>\n<\/ul>\n

                        Th\u00e0nh th\u1ea1o nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y \u0111\u00f2i h\u1ecfi th\u1eddi gian v\u00e0 th\u1ef1c h\u00e0nh. N\u00f3 bao g\u1ed3m vi\u1ec7c \u0111\u1ecdc m\u00e3 ngu\u1ed3n, thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 v\u00e0 c\u1ea3i ti\u1ebfn l\u1ea1i c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n c\u00f3. M\u1ee5c ti\u00eau kh\u00f4ng ch\u1ec9 l\u00e0 vi\u1ebft m\u00e3 ho\u1ea1t \u0111\u1ed9ng, m\u00e0 c\u00f2n l\u00e0 vi\u1ebft m\u00e3 d\u1ec5 hi\u1ec3u v\u00e0 linh ho\u1ea1t. B\u1eb1ng c\u00e1ch coi c\u00e1c l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 nh\u1eefng kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n thay v\u00ec quy t\u1eafc c\u00fa ph\u00e1p, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n

                        Khi b\u1ea1n ti\u1ebfp t\u1ee5c h\u00e0nh tr\u00ecnh trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m, h\u00e3y nh\u1edb r\u1eb1ng b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf ch\u1ec9 t\u1ed1t b\u1eb1ng c\u1ea5u tr\u00fac m\u00e0 n\u00f3 h\u1ed7 tr\u1ee3. S\u1eed d\u1ee5ng c\u00e1c l\u1edbp \u0111\u1ec3 s\u1eafp x\u1ebfp suy ngh\u0129 c\u1ee7a b\u1ea1n v\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n t\u1ea7m nh\u00ecn c\u1ee7a b\u1ea1n. C\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 k\u1ef7 lu\u1eadt n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c gi\u1ea3i ph\u00e1p ph\u1ea7n m\u1ec1m m\u1ea1nh m\u1ebd v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng cao.<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Trong b\u1ed1i c\u1ea3nh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, c\u1ea5u tr\u00fac l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng nh\u1ea5t. Khi c\u00e1c k\u1ef9 s\u01b0 ti\u1ebfp c\u1eadn nh\u1eefng v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p, h\u1ecd kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n…<\/p>\n","protected":false},"author":1,"featured_media":1947,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Hi\u1ec3u \u0111\u01a1n gi\u1ea3n v\u1ec1 L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng | H\u01b0\u1edbng d\u1eabn OOAD","_yoast_wpseo_metadesc":"M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng trong Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. H\u1ecdc c\u00e1c \u0111\u1ecbnh ngh\u0129a, s\u1ef1 kh\u00e1c bi\u1ec7t, nguy\u00ean t\u1eafc v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[94],"tags":[87,93],"class_list":["post-1946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-object-oriented-analysis-and-design","tag-academic","tag-object-oriented-analysis-and-design"],"yoast_head":"\nHi\u1ec3u \u0111\u01a1n gi\u1ea3n v\u1ec1 L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng | H\u01b0\u1edbng d\u1eabn OOAD<\/title>\n<meta name=\"description\" content=\"M\u1ed9t h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng trong Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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