{"id":1832,"date":"2026-04-03T03:41:50","date_gmt":"2026-04-03T03:41:50","guid":{"rendered":"https:\/\/www.ez-knowledge.com\/vi\/refactoring-chaos-uml-sequence-diagrams-guide\/"},"modified":"2026-04-03T03:41:50","modified_gmt":"2026-04-03T03:41:50","slug":"refactoring-chaos-uml-sequence-diagrams-guide","status":"publish","type":"post","link":"https:\/\/www.ez-knowledge.com\/vi\/refactoring-chaos-uml-sequence-diagrams-guide\/","title":{"rendered":"T\u00e1i c\u1ea5u tr\u00fac h\u1ed7n lo\u1ea1n: Bi\u1ebfn m\u00e3 l\u1ed9n x\u1ed9n th\u00e0nh c\u00e1c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML s\u1ea1ch s\u1ebd"},"content":{"rendered":"

C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m ph\u00e1t tri\u1ec3n theo th\u1eddi gian. Nh\u1eefng g\u00ec b\u1eaft \u0111\u1ea7u nh\u01b0 m\u1ed9t \u0111o\u1ea1n m\u00e3 \u0111\u01a1n gi\u1ea3n th\u01b0\u1eddng ph\u00e1t tri\u1ec3n th\u00e0nh m\u1ed9t m\u1ea1ng l\u01b0\u1edbi ph\u1ee9c t\u1ea1p c\u00e1c ph\u1ee5 thu\u1ed9c, logic \u1ea9n gi\u1ea5u v\u00e0 c\u00e1c \u0111\u01b0\u1eddng th\u1ef1c thi r\u1ed1i ren. S\u1ef1 t\u00edch t\u1ee5 n\u1ee3 k\u1ef9 thu\u1eadt n\u00e0y t\u1ea1o ra m\u1ed9t tr\u1ea1ng th\u00e1i th\u01b0\u1eddng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 l\u00e0 h\u1ed7n lo\u1ea1n. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea3m th\u1ea5y m\u00ecnh \u0111ang l\u1ed9i qua nhi\u1ec1u l\u1edbp tr\u1eebu t\u01b0\u1ee3ng, kh\u00f4ng r\u00f5 d\u1eef li\u1ec7u ch\u1ea3y t\u1eeb \u0111i\u1ec3m v\u00e0o \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u01b0 th\u1ebf n\u00e0o. Gi\u1ea3i ph\u00e1p kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c vi\u1ebft l\u1ea1i m\u00e3 ngu\u1ed3n \u0111\u01a1n thu\u1ea7n, m\u00e0 n\u1eb1m \u1edf vi\u1ec7c tr\u1ef1c quan h\u00f3a ki\u1ebfn tr\u00fac hi\u1ec7n t\u1ea1i. M\u1ed9t s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML cung c\u1ea5p c\u00e1ch th\u1ee9c c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 b\u1ea3n \u0111\u1ed3 h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c n\u00e0y. B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch ng\u01b0\u1ee3c m\u00e3 ngu\u1ed3n, c\u00e1c \u0111\u1ed9i ng\u0169 c\u00f3 th\u1ec3 bi\u1ebfn logic m\u1edd \u00e1m th\u00e0nh nh\u1eefng b\u1ea3n thi\u1ebft k\u1ebf r\u00f5 r\u00e0ng, d\u1ec5 giao ti\u1ebfp.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y n\u00eau r\u00f5 ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 tr\u00edch xu\u1ea5t tr\u1eadt t\u1ef1 t\u1eeb h\u1ed7n lo\u1ea1n. N\u00f3 t\u1eadp trung v\u00e0o quy tr\u00ecnh k\u1ef9 thu\u1eadt quan s\u00e1t vi\u1ec7c th\u1ef1c thi m\u00e3 ngu\u1ed3n \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ch\u00ednh x\u00e1c. M\u1ee5c ti\u00eau l\u00e0 s\u1ef1 r\u00f5 r\u00e0ng, kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft chung gi\u1eefa c\u00e1c b\u00ean li\u00ean quan. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u01a1 ch\u1ebf t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, t\u1ea7m quan tr\u1ecdng c\u1ee7a th\u1eddi gian, v\u00e0 c\u00e1c b\u01b0\u1edbc c\u1ea7n thi\u1ebft \u0111\u1ec3 ghi ch\u00e9p c\u00e1c lu\u1ed3ng n\u00e0y m\u00e0 kh\u00f4ng t\u1ea1o ra l\u1ed7i m\u1edbi.<\/p>\n

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\"Sketch-style<\/figure>\n<\/div>\n

Hi\u1ec3u r\u00f5 tr\u1ea1ng th\u00e1i h\u1ed7n lo\u1ea1n \ud83c\udf2a\ufe0f<\/h2>\n

Tr\u01b0\u1edbc khi s\u1eeda ch\u1eefa m\u1ed9t h\u1ec7 th\u1ed1ng, c\u1ea7n ph\u1ea3i hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a s\u1ef1 h\u1ed7n lo\u1ea1n. M\u00e3 ngu\u1ed3n l\u1ed9n x\u1ed9n th\u01b0\u1eddng th\u1ec3 hi\u1ec7n nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m c\u1ee5 th\u1ec3 l\u00e0m m\u1edd d\u00f2ng ch\u1ea3y \u0111i\u1ec1u khi\u1ec3n. Nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y kh\u00f4ng ch\u1ec9 mang t\u00ednh th\u1ea9m m\u1ef9; ch\u00fang \u0111\u1ea1i di\u1ec7n cho nh\u1eefng \u0111i\u1ec3m y\u1ebfu v\u1ec1 c\u1ea5u tr\u00fac, c\u1ea3n tr\u1edf ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai.<\/p>\n

    \n
  • Logic ki\u1ec3u m\u00ec \u1ed1ng:<\/strong> C\u00e1c h\u00e0m g\u1ecdi nhau theo c\u00e1ch kh\u00f4ng tuy\u1ebfn t\u00ednh, l\u1ed3ng gh\u00e9p s\u00e2u.<\/li>\n
  • C\u00e1c ph\u1ee5 thu\u1ed9c \u1ea9n:<\/strong> C\u00e1c d\u1ecbch v\u1ee5 ho\u1eb7c module \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o ng\u1ea7m trong c\u00e1c ph\u01b0\u01a1ng th\u1ee9c, khi\u1ebfn vi\u1ec7c theo d\u00f5i v\u00f2ng \u0111\u1eddi tr\u1edf n\u00ean kh\u00f3 kh\u0103n.<\/li>\n
  • D\u1eef li\u1ec7u b\u1ecb b\u1ecf r\u01a1i:<\/strong> Th\u00f4ng tin \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i m\u00e0 kh\u00f4ng c\u00f3 ch\u1ee7 s\u1edf h\u1eefu r\u00f5 r\u00e0ng ho\u1eb7c qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi.<\/li>\n
  • T\u00ean g\u1ecdi kh\u00f4ng nh\u1ea5t qu\u00e1n:<\/strong> T\u00ean bi\u1ebfn v\u00e0 ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng ph\u1ea3n \u00e1nh \u0111\u00fang m\u1ee5c \u0111\u00edch th\u1ef1c t\u1ebf ho\u1eb7c d\u1eef li\u1ec7u m\u00e0 ch\u00fang mang theo.<\/li>\n<\/ul>\n

    Khi m\u00e3 ngu\u1ed3n s\u1edf h\u1eefu nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y, m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ed1 g\u1eafng th\u00eam t\u00ednh n\u0103ng th\u01b0\u1eddng c\u1ea3m th\u1ea5y m\u00ecnh \u0111ang \u0111o\u00e1n m\u00f2. H\u1ecd ch\u00e8n logic \u1edf \u0111\u00e2y \u0111\u00f3, hy v\u1ecdng s\u1ebd ph\u00f9 h\u1ee3p. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c l\u1ed7i h\u1ed3i quy v\u00e0 l\u00e0m h\u1ec7 th\u1ed1ng suy gi\u1ea3m th\u00eam. M\u1ed9t s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n \u0111\u1ed3. N\u00f3 bu\u1ed9c ng\u01b0\u1eddi vi\u1ebft ph\u1ea3i c\u00f4ng nh\u1eadn m\u1ecdi th\u00e0nh vi\u00ean tham gia v\u00e0o m\u1ed9t t\u01b0\u01a1ng t\u00e1c c\u1ee5 th\u1ec3. N\u00f3 ti\u1ebft l\u1ed9 h\u1ec7 th\u1ed1ng \u0111ang t\u1ed1n th\u1eddi gian \u1edf \u0111\u00e2u v\u00e0 \u0111ang ch\u1edd \u0111\u1ee3i \u1edf \u0111\u00e2u.<\/p>\n

    H\u00e3y xem x\u00e9t m\u1ed9t module di s\u1ea3n \u0111i\u1ec3n h\u00ecnh. M\u1ed9t y\u00eau c\u1ea7u \u0111\u1ebfn. N\u00f3 ch\u1ea1m v\u00e0o m\u1ed9t controller, controller n\u00e0y g\u1ecdi m\u1ed9t d\u1ecbch v\u1ee5. D\u1ecbch v\u1ee5 truy v\u1ea5n m\u1ed9t repository. C\u01a1 s\u1edf d\u1eef li\u1ec7u tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3. D\u1ecbch v\u1ee5 chuy\u1ec3n \u0111\u1ed5i k\u1ebft qu\u1ea3 v\u00e0 tr\u1ea3 l\u1ea1i cho controller. Trong m\u00e3 ngu\u1ed3n, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 tr\u00ean m\u01b0\u1eddi t\u1ec7p. Trong s\u01a1 \u0111\u1ed3, n\u00f3 l\u00e0 m\u1ed9t lu\u1ed3ng th\u1eb3ng \u0111\u1ee9ng t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi. Bi\u1ec3u di\u1ec5n tr\u1ef1c quan gi\u00fap gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c c\u1ea7n thi\u1ebft \u0111\u1ec3 hi\u1ec3u h\u1ec7 th\u1ed1ng.<\/p>\n

    Gi\u00e1 tr\u1ecb c\u1ee7a s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 UML \ud83d\udcd0<\/h2>\n

    T\u1ea1i sao ch\u1ecdn s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 thay v\u00ec c\u00e1c d\u1ea1ng t\u00e0i li\u1ec7u kh\u00e1c? C\u00e1c s\u01a1 \u0111\u1ed3 kh\u00e1c, nh\u01b0 s\u01a1 \u0111\u1ed3 l\u1edbp, th\u1ec3 hi\u1ec7n c\u1ea5u tr\u00fac t\u0129nh. Ch\u00fang cho b\u1ea1n bi\u1ebft c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o t\u1ed3n t\u1ea1i v\u00e0 ch\u00fang li\u00ean h\u1ec7 v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o. Ch\u00fang kh\u00f4ng n\u00f3i cho b\u1ea1n bi\u1ebft \u0111i\u1ec1u g\u00ec x\u1ea3y ra khi h\u1ec7 th\u1ed1ng ch\u1ea1y. M\u1ed9t s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ghi l\u1ea1i h\u00e0nh vi \u0111\u1ed9ng. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi:\u0110i\u1ec1u g\u00ec x\u1ea3y ra khi h\u00e0nh \u0111\u1ed9ng n\u00e0y x\u1ea3y ra?<\/em><\/p>\n

    L\u1ee3i \u00edch ch\u00ednh khi t\u00e1i c\u1ea5u tr\u00fac<\/h3>\n
      \n
    • X\u00e1c minh logic:<\/strong> B\u1eb1ng c\u00e1ch v\u1ebd lu\u1ed3ng, b\u1ea1n x\u00e1c minh xem m\u00e3 ngu\u1ed3n th\u1ef1c s\u1ef1 c\u00f3 l\u00e0m \u0111\u00fang nh\u1eefng g\u00ec n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 l\u00e0m hay kh\u00f4ng. Nh\u1eefng kh\u00e1c bi\u1ec7t gi\u1eefa s\u01a1 \u0111\u1ed3 v\u00e0 m\u00e3 ngu\u1ed3n th\u01b0\u1eddng ti\u1ebft l\u1ed9 c\u00e1c l\u1ed7i.<\/li>\n
    • Ph\u00e1t hi\u1ec7n \u0111i\u1ec3m ngh\u1ebdn:<\/strong> Nh\u1eefng \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng d\u00e0i ho\u1eb7c nhi\u1ec1u t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0m n\u1ed5i b\u1eadt c\u00e1c v\u1ea5n \u0111\u1ec1 hi\u1ec7u su\u1ea5t tr\u01b0\u1edbc khi ch\u00fang tr\u1edf n\u00ean nghi\u00eam tr\u1ecdng.<\/li>\n
    • C\u00f4ng c\u1ee5 giao ti\u1ebfp:<\/strong> M\u1ed9t s\u01a1 \u0111\u1ed3 l\u00e0 ng\u00f4n ng\u1eef ph\u1ed5 qu\u00e1t. N\u00f3 cho ph\u00e9p c\u00e1c b\u00ean li\u00ean quan kh\u00f4ng chuy\u00ean c\u00f3 th\u1ec3 hi\u1ec3u lu\u1ed3ng m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ecdc m\u00e3 ngu\u1ed3n.<\/li>\n
    • An to\u00e0n khi t\u00e1i c\u1ea5u tr\u00fac:<\/strong> Khi thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n, s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u01a1 s\u1edf chu\u1ea9n. N\u1ebfu m\u00e3 m\u1edbi l\u1ec7ch kh\u1ecfi s\u01a1 \u0111\u1ed3, vi\u1ec7c t\u00e1i c\u1ea5u tr\u00fac c\u00f3 th\u1ec3 \u0111\u00e3 t\u1ea1o ra c\u00e1c hi\u1ec7u \u1ee9ng ph\u1ee5 kh\u00f4ng mong mu\u1ed1n.<\/li>\n<\/ul>\n

      Chu\u1ea9n b\u1ecb: Chu\u1ea9n b\u1ecb s\u00e2n kh\u1ea5u \ud83d\udee0\ufe0f<\/h2>\n

      Vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u00e1ng tin c\u1eady \u0111\u00f2i h\u1ecfi s\u1ef1 chu\u1ea9n b\u1ecb. Kh\u00f4ng th\u1ec3 \u0111\u01a1n gi\u1ea3n b\u1eaft \u0111\u1ea7u v\u1ebd khi \u0111\u1ecdc m\u00e3 ngu\u1ed3n t\u1eebng d\u00f2ng m\u1ed9t. C\u1ea7n c\u00f3 m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c r\u00f5 r\u00e0ng. Qu\u00e1 tr\u00ecnh b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c x\u00e1c \u0111\u1ecbnh ph\u1ea1m vi. M\u1ed9t s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho to\u00e0n b\u1ed9 \u1ee9ng d\u1ee5ng, nh\u01b0ng th\u01b0\u1eddng hi\u1ec7u qu\u1ea3 h\u01a1n khi t\u1eadp trung v\u00e0o m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 ho\u1eb7c \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng.<\/p>\n

      X\u00e1c \u0111\u1ecbnh ph\u1ea1m vi<\/h3>\n

      Ch\u1ecdn m\u1ed9t giao d\u1ecbch c\u1ee5 th\u1ec3. V\u00ed d\u1ee5: \u201c\u0110\u0103ng nh\u1eadp ng\u01b0\u1eddi d\u00f9ng\u201d ho\u1eb7c \u201cX\u1eed l\u00fd thanh to\u00e1n\u201d. \u0110i\u1ec1u n\u00e0y cung c\u1ea5p \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac r\u00f5 r\u00e0ng. Kh\u00f4ng c\u00f3 ranh gi\u1edbi, s\u01a1 \u0111\u1ed3 s\u1ebd qu\u00e1 l\u1edbn \u0111\u1ec3 \u0111\u1ecdc. T\u1eadp trung n\u00ean duy tr\u00ec \u1edf t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong giao d\u1ecbch c\u1ee5 th\u1ec3 n\u00e0y.<\/p>\n

      Thu th\u1eadp b\u1ed1i c\u1ea3nh<\/h3>\n

      Tr\u01b0\u1edbc khi m\u1edf tr\u00ecnh ch\u1ec9nh s\u1eeda, h\u00e3y hi\u1ec3u r\u00f5 l\u0129nh v\u1ef1c. Nh\u1eefng th\u1ef1c th\u1ec3 n\u00e0o tham gia? C\u00f3 API b\u00ean ngo\u00e0i kh\u00f4ng? C\u00f3 giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng? Hi\u1ec3u b\u1ed1i c\u1ea3nh gi\u00fap \u0111\u1eb7t t\u00ean cho c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng ch\u00ednh x\u00e1c. Nh\u1eefng t\u00ean chung nh\u01b0 \u201c\u0110\u1ed1i t\u01b0\u1ee3ng 1\u201d hay \u201cHandler\u201d mang l\u1ea1i \u00edt gi\u00e1 tr\u1ecb. Nh\u1eefng t\u00ean c\u1ee5 th\u1ec3 nh\u01b0 \u201cAuthController\u201d hay \u201cPaymentGateway\u201d truy\u1ec1n t\u1ea3i \u00fd ngh\u0129a r\u00f5 r\u00e0ng.<\/p>\n

      Quy tr\u00ecnh tr\u00edch xu\u1ea5t: T\u1eeb m\u00e3 ngu\u1ed3n \u0111\u1ebfn s\u01a1 \u0111\u1ed3 \ud83d\udd0d<\/h2>\n

      Nhi\u1ec7m v\u1ee5 c\u1ed1t l\u00f5i l\u00e0 k\u1ef9 thu\u1eadt ng\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m vi\u1ec7c theo d\u00f5i \u0111\u01b0\u1eddng \u0111i th\u1ef1c thi v\u00e0 chuy\u1ec3n \u0111\u1ed5i c\u00e1c c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n th\u00e0nh c\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3. Vi\u1ec7c n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 ki\u00ean nh\u1eabn v\u00e0 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft. C\u00e1c b\u01b0\u1edbc sau \u0111\u00e2y m\u00f4 t\u1ea3 quy tr\u00ecnh l\u00e0m vi\u1ec7c.<\/p>\n

      B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh c\u00e1c t\u00e1c nh\u00e2n<\/h3>\n

      M\u1ecdi t\u01b0\u01a1ng t\u00e1c \u0111\u1ec1u b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t ngu\u1ed3n. Trong s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng m\u1ed9t T\u00e1c nh\u00e2n<\/strong>. T\u00e1c nh\u00e2n l\u00e0 c\u00e1c th\u1ef1c th\u1ec3 b\u00ean ngo\u00e0i kh\u1edfi t\u1ea1o qu\u00e1 tr\u00ecnh. Ch\u00fang c\u00f3 th\u1ec3 l\u00e0 ng\u01b0\u1eddi d\u00f9ng, c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c ho\u1eb7c c\u00e1c t\u00e1c v\u1ee5 \u0111\u01b0\u1ee3c l\u00ean l\u1ecbch.<\/p>\n

        \n
      • Ng\u01b0\u1eddi d\u00f9ng con ng\u01b0\u1eddi:<\/strong>\u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng bi\u1ec3u t\u01b0\u1ee3ng h\u00ecnh ng\u01b0\u1eddi que ti\u00eau chu\u1ea9n.<\/li>\n
      • H\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i:<\/strong>\u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 nh\u00e3n \u201cT\u00e1c nh\u00e2n\u201d ho\u1eb7c t\u00ean h\u1ec7 th\u1ed1ng c\u1ee5 th\u1ec3.<\/li>\n
      • C\u00e1c t\u00e1c v\u1ee5 \u0111\u01b0\u1ee3c l\u00ean l\u1ecbch:<\/strong>\u0110\u01b0\u1ee3c bi\u1ec3u di\u1ec5n t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n

        B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m v\u00e0o trong m\u00e3 ngu\u1ed3n. Th\u01b0\u1eddng l\u00e0 ph\u01b0\u01a1ng th\u1ee9c g\u1ed1c ho\u1eb7c tr\u00ecnh x\u1eed l\u00fd \u0111i\u1ec3m cu\u1ed1i API. Ph\u01b0\u01a1ng th\u1ee9c n\u00e0y l\u00e0 kh\u1edfi ph\u00e1t cho t\u01b0\u01a1ng t\u00e1c.<\/p>\n

        B\u01b0\u1edbc 2: B\u1ea3n \u0111\u1ed3 c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng<\/h3>\n

        Sau khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c t\u00e1c nh\u00e2n, h\u00e3y x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia v\u00e0o qu\u00e1 tr\u00ecnh. M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng s\u1ebd c\u00f3 m\u1ed9t \u0110\u01b0\u1eddng s\u1ed1ng<\/strong>. \u0110\u01b0\u1eddng s\u1ed1ng l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t \u0111\u1ee9ng, k\u00e9o d\u00e0i xu\u1ed1ng t\u1eeb t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 \u0111\u1ea1i di\u1ec7n cho s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 theo th\u1eddi gian.<\/p>\n

        Khi qu\u00e9t m\u00e3 ngu\u1ed3n, h\u00e3y t\u00ecm ki\u1ebfm:<\/p>\n

          \n
        • Kh\u1edfi t\u1ea1o l\u1edbp:<\/strong>C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u1ea1o \u1edf \u0111\u00e2u? Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y s\u1ebd tr\u1edf th\u00e0nh c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng.<\/li>\n
        • G\u1ecdi ph\u01b0\u01a1ng th\u1ee9c:<\/strong>Nh\u1eefng ph\u01b0\u01a1ng th\u1ee9c n\u00e0o \u0111\u01b0\u1ee3c g\u1ecdi? \u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
        • Thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i:<\/strong>\u0110\u1ed1i t\u01b0\u1ee3ng n\u00e0o \u0111ang gi\u1eef d\u1eef li\u1ec7u \u0111ang \u0111\u01b0\u1ee3c x\u1eed l\u00fd?<\/li>\n<\/ul>\n

          S\u1eafp x\u1ebfp c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng theo chi\u1ec1u ngang. Th\u1ee9 t\u1ef1 ph\u1ea3i ph\u1ea3n \u00e1nh lu\u1ed3ng logic. Th\u01b0\u1eddng th\u00ec t\u00e1c nh\u00e2n kh\u1edfi t\u1ea1o \u1edf b\u00ean tr\u00e1i, c\u00f2n l\u01b0u tr\u1eef d\u1eef li\u1ec7u ho\u1eb7c c\u00e1c ph\u1ee5 thu\u1ed9c b\u00ean ngo\u00e0i \u1edf b\u00ean ph\u1ea3i. S\u1eafp x\u1ebfp kh\u00f4ng gian n\u00e0y gi\u00fap d\u1ec5 \u0111\u1ecdc h\u01a1n.<\/p>\n

          B\u01b0\u1edbc 3: V\u1ebd c\u00e1c tin nh\u1eafn<\/h3>\n

          C\u00e1c tin nh\u1eafn \u0111\u1ea1i di\u1ec7n cho s\u1ef1 giao ti\u1ebfp gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng. Ch\u00fang \u0111\u01b0\u1ee3c v\u1ebd d\u01b0\u1edbi d\u1ea1ng m\u0169i t\u00ean ngang. C\u00f3 hai lo\u1ea1i tin nh\u1eafn ch\u00ednh c\u1ea7n ph\u00e2n bi\u1ec7t:<\/p>\n

            \n
          • Tin nh\u1eafn \u0111\u1ed3ng b\u1ed9:<\/strong> Ng\u01b0\u1eddi g\u1ecdi ch\u1edd ph\u1ea3n h\u1ed3i. Trong m\u00e3 ngu\u1ed3n, \u0111i\u1ec1u n\u00e0y tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t l\u1eddi g\u1ecdi h\u00e0m ti\u00eau chu\u1ea9n. M\u0169i t\u00ean l\u00e0 li\u1ec1n n\u00e9t v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean \u0111\u1ea7y.<\/li>\n
          • Tin nh\u1eafn b\u1ea5t \u0111\u1ed3ng b\u1ed9:<\/strong> Ng\u01b0\u1eddi g\u1ecdi kh\u00f4ng ch\u1edd \u0111\u1ee3i. N\u00f3 g\u1eedi t\u00edn hi\u1ec7u v\u00e0 ti\u1ebfp t\u1ee5c th\u1ef1c hi\u1ec7n. Trong m\u00e3 ngu\u1ed3n, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t ho\u1eb7c m\u1ed9t t\u00e1c v\u1ee5 g\u1eedi \u0111i r\u1ed3i qu\u00ean. M\u0169i t\u00ean l\u00e0 n\u00e9t \u0111\u1ee9t v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean h\u1edf.<\/li>\n<\/ul>\n

            G\u1eafn nh\u00e3n m\u1ed7i tin nh\u1eafn v\u1edbi t\u00ean ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c h\u00e0nh \u0111\u1ed9ng \u0111ang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. \u0110i\u1ec1u n\u00e0y cung c\u1ea5p “\u0111\u1ed9ng t\u1eeb” cho t\u01b0\u01a1ng t\u00e1c. V\u00ed d\u1ee5, getUserById()<\/code> ho\u1eb7c validateToken()<\/code>.<\/p>\n

            B\u01b0\u1edbc 4: Bi\u1ec3u di\u1ec5n thanh k\u00edch ho\u1ea1t<\/h3>\n

            M\u1ed9t Thanh k\u00edch ho\u1ea1t<\/strong> (ho\u1eb7c s\u1ef1 ki\u1ec7n th\u1ef1c thi) l\u00e0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt m\u1ecfng tr\u00ean \u0111\u01b0\u1eddng s\u1ed1ng. N\u00f3 cho bi\u1ebft khi n\u00e0o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng. N\u00f3 th\u1ec3 hi\u1ec7n th\u1eddi gian k\u00e9o d\u00e0i c\u1ee7a thao t\u00e1c.<\/p>\n

            \u0110\u1ec3 x\u00e1c \u0111\u1ecbnh khi n\u00e0o c\u1ea7n v\u1ebd thanh k\u00edch ho\u1ea1t:<\/p>\n

              \n
            • B\u1eaft \u0111\u1ea7u thanh t\u1eeb khi nh\u1eadn \u0111\u01b0\u1ee3c tin nh\u1eafn.<\/li>\n
            • K\u1ebft th\u00fac thanh khi g\u1eedi ph\u1ea3n h\u1ed3i.<\/li>\n
            • N\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng g\u1ecdi ch\u00ednh n\u00f3 (g\u1ecdi \u0111\u1ec7 quy), thanh k\u00edch ho\u1ea1t s\u1ebd ti\u1ebfp t\u1ee5c qua tin nh\u1eafn t\u1ef1 th\u00e2n.<\/li>\n<\/ul>\n

              D\u1ea5u hi\u1ec7u tr\u1ef1c quan n\u00e0y r\u1ea5t quan tr\u1ecdng trong vi\u1ec7c t\u00e1i c\u1ea5u tr\u00fac m\u00e3. N\u00f3 l\u00e0m n\u1ed5i b\u1eadt nh\u1eefng ph\u1ea7n n\u00e0o c\u1ee7a m\u00e3 \u0111ang l\u00e0m ch\u1eadm lu\u1ed3ng th\u1ef1c thi. N\u1ebfu thanh k\u00edch ho\u1ea1t k\u00e9o d\u00e0i b\u1ea5t th\u01b0\u1eddng, \u0111i\u1ec1u \u0111\u00f3 cho th\u1ea5y c\u00f3 th\u1ec3 \u0111ang c\u00f3 thao t\u00e1c t\u00ednh to\u00e1n n\u1eb7ng ho\u1eb7c thao t\u00e1c I\/O b\u1ecb ch\u1eb7n, c\u1ea7n \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/p>\n

              X\u1eed l\u00fd logic ph\u1ee9c t\u1ea1p \ud83d\udcbb<\/h2>\n

              M\u00e3 th\u1ef1c t\u1ebf hi\u1ebfm khi tu\u00e2n theo m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. N\u00f3 ch\u1ee9a v\u00f2ng l\u1eb7p, \u0111i\u1ec1u ki\u1ec7n v\u00e0 x\u1eed l\u00fd l\u1ed7i. S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 ph\u1ea3i th\u1ec3 hi\u1ec7n nh\u1eefng ph\u1ee9c t\u1ea1p n\u00e0y \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n

              V\u00f2ng l\u1eb7p v\u00e0 l\u1eb7p l\u1ea1i<\/h3>\n

              N\u1ebfu m\u1ed9t qu\u00e1 tr\u00ecnh bao g\u1ed3m vi\u1ec7c l\u1eb7p qua m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u, h\u00e3y s\u1eed d\u1ee5ng ph\u1ea7n Loop<\/strong> ph\u1ea7n. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c v\u1ebd nh\u01b0 m\u1ed9t h\u1ed9p v\u1edbi ch\u1eef \u201cLoop\u201d \u1edf tr\u00ean c\u00f9ng. B\u00ean trong h\u1ed9p, \u0111\u1eb7t c\u00e1c tin nh\u1eafn l\u1eb7p l\u1ea1i. Th\u00eam nh\u00e3n \u0111i\u1ec1u ki\u1ec7n (v\u00ed d\u1ee5: \u201cV\u1edbi m\u1ed7i m\u1ee5c\u201d) \u0111\u1ec3 l\u00e0m r\u00f5 ph\u1ea1m vi.<\/p>\n

              Kh\u00f4ng v\u1ebd t\u1eebng l\u1ea7n l\u1eb7p ri\u00eang l\u1ebb. \u0110i\u1ec1u n\u00e0y s\u1ebd l\u00e0m r\u1ed1i s\u01a1 \u0111\u1ed3. Ph\u1ea7n v\u00f2ng l\u1eb7p cho bi\u1ebft c\u00e1c tin nh\u1eafn b\u00ean trong s\u1ebd l\u1eb7p l\u1ea1i cho \u0111\u1ebfn khi \u0111i\u1ec1u ki\u1ec7n \u0111\u01b0\u1ee3c th\u1ecfa m\u00e3n.<\/p>\n

              C\u00e1c nh\u00e1nh \u0111i\u1ec1u ki\u1ec7n<\/h3>\n

              S\u1eed d\u1ee5ng ph\u1ea7n Alt<\/strong> (T\u00f9y ch\u1ecdn) \u0111\u1ec3 bi\u1ec3u di\u1ec5n logic if-else. H\u1ed9p n\u00e0y ch\u1ee9a nhi\u1ec1u ph\u1ea7n, m\u1ed7i ph\u1ea7n c\u00f3 nh\u00e3n \u0111i\u1ec1u ki\u1ec7n (v\u00ed d\u1ee5: \u201c[Token h\u1ee3p l\u1ec7]\u201d, \u201c[Token kh\u00f4ng h\u1ee3p l\u1ec7]\u201d). Ch\u1ec9 c\u00f3 m\u1ed9t nh\u00e1nh \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong m\u1ed9t l\u1ea7n th\u1ef1c thi c\u1ee5 th\u1ec3. Vi\u1ec7c v\u1ebd t\u1ea5t c\u1ea3 c\u00e1c nh\u00e1nh s\u1ebd cho th\u1ea5y c\u00e2y quy\u1ebft \u0111\u1ecbnh ho\u00e0n ch\u1ec9nh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

              X\u1eed l\u00fd ngo\u1ea1i l\u1ec7<\/h3>\n

              L\u1ed7i l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a lu\u1ed3ng. S\u1eed d\u1ee5ng ph\u1ea7n Opt<\/strong> (T\u1ed1i \u01b0u) ho\u1eb7c Exception<\/strong>ph\u1ea7n \u0111\u1ec3 hi\u1ec3n th\u1ecb \u0111i\u1ec1u g\u00ec x\u1ea3y ra khi c\u00f3 \u0111i\u1ec1u g\u00ec \u0111\u00f3 th\u1ea5t b\u1ea1i. N\u1ebfu l\u1ed7i \u0111\u01b0\u1ee3c b\u1eaft v\u00e0 x\u1eed l\u00fd m\u1ed9t c\u00e1ch tr\u01a1n tru, h\u00e3y hi\u1ec3n th\u1ecb \u0111\u01b0\u1eddng \u0111i ph\u1ee5c h\u1ed3i. N\u1ebfu l\u1ed7i lan truy\u1ec1n, h\u00e3y hi\u1ec3n th\u1ecb m\u0169i t\u00ean ngo\u1ea1i l\u1ec7 quay tr\u1edf l\u1ea1i ng\u01b0\u1eddi g\u1ecdi.<\/p>\n

              B\u1ecf qua c\u00e1c nh\u00e1nh l\u1ed7i t\u1ea1o ra c\u1ea3m gi\u00e1c an to\u00e0n gi\u1ea3 t\u1ea1o. M\u1ed9t s\u01a1 \u0111\u1ed3 v\u1eefng ch\u1eafc ph\u1ea3i t\u00ednh \u0111\u1ebfn c\u00e1c tr\u1ea1ng th\u00e1i th\u1ea5t b\u1ea1i.<\/p>\n

              Tinh ch\u1ec9nh s\u01a1 \u0111\u1ed3 \u0111\u1ec3 r\u00f5 r\u00e0ng h\u01a1n \u2728<\/h2>\n

              Sau khi b\u1ea3n nh\u00e1p ban \u0111\u1ea7u ho\u00e0n th\u00e0nh, s\u01a1 \u0111\u1ed3 ph\u1ea3i \u0111\u01b0\u1ee3c xem x\u00e9t v\u00e0 tinh ch\u1ec9nh. Vi\u1ec7c tr\u00edch xu\u1ea5t m\u00e3 th\u00f4 th\u01b0\u1eddng ch\u1ee9a qu\u00e1 nhi\u1ec1u chi ti\u1ebft. M\u1ee5c ti\u00eau l\u00e0 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a m\u00e0 v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c \u00fd ngh\u0129a.<\/p>\n

              Gom c\u00e1c t\u01b0\u01a1ng t\u00e1c<\/h3>\n

              N\u1ebfu m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng duy nh\u1ea5t th\u1ef1c hi\u1ec7n nhi\u1ec1u nhi\u1ec7m v\u1ee5 nh\u1ecf, h\u00e3y gom ch\u00fang l\u1ea1i th\u00e0nh m\u1ed9t tin nh\u1eafn t\u1ed5ng h\u1ee3p duy nh\u1ea5t. V\u00ed d\u1ee5, thay v\u00ec v\u1ebd n\u0103m l\u1eddi g\u1ecdi ri\u00eang bi\u1ec7t \u0111\u1ec3 t\u1ea3i c\u1ea5u h\u00ecnh, d\u1eef li\u1ec7u t\u1ec7p v\u00e0 x\u00e1c th\u1ef1c c\u00e0i \u0111\u1eb7t, h\u00e3y gom ch\u00fang l\u1ea1i d\u01b0\u1edbi m\u1ed9t tin nh\u1eafn duy nh\u1ea5t InitializeContext()<\/code>tin nh\u1eafn. \u0110i\u1ec1u n\u00e0y gi\u1ea3m thi\u1ec3u ti\u1ebfng \u1ed3n th\u1ecb gi\u00e1c.<\/p>\n

              Lo\u1ea1i b\u1ecf s\u1ef1 tr\u00f9ng l\u1eb7p<\/h3>\n

              \u0110\u1eebng v\u1ebd t\u1eebng getter v\u00e0 setter m\u1ed9t. \u0110\u00e2y l\u00e0 chi ti\u1ebft tri\u1ec3n khai. H\u00e3y t\u1eadp trung v\u00e0o logic kinh doanh. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c ch\u1ec9 tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb m\u00e0 kh\u00f4ng x\u1eed l\u00fd, th\u01b0\u1eddng th\u00ec n\u00f3 kh\u00f4ng c\u1ea7n xu\u1ea5t hi\u1ec7n nh\u01b0 m\u1ed9t tin nh\u1eafn ri\u00eang bi\u1ec7t tr\u1eeb khi \u0111i\u1ec1u \u0111\u00f3 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi lu\u1ed3ng.<\/p>\n

              Ti\u00eau chu\u1ea9n h\u00f3a k\u00fd hi\u1ec7u<\/h3>\n

              \u0110\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n trong c\u00e1ch v\u1ebd c\u00e1c ph\u1ea7n t\u1eed. S\u1eed d\u1ee5ng \u0111\u01b0\u1eddng li\u1ec1n cho c\u00e1c l\u1eddi g\u1ecdi \u0111\u1ed3ng b\u1ed9 v\u00e0 \u0111\u01b0\u1eddng g\u1ea1ch ch\u1ea5m cho c\u00e1c l\u1eddi g\u1ecdi b\u1ea5t \u0111\u1ed3ng b\u1ed9 trong to\u00e0n b\u1ed9 t\u00e0i li\u1ec7u. S\u1eed d\u1ee5ng nh\u00e3n chu\u1ea9n UML cho c\u00e1c \u0111o\u1ea1n (Alt, Opt, Loop). T\u00ednh nh\u1ea5t qu\u00e1n gi\u00fap ng\u01b0\u1eddi \u0111\u1ecdc hi\u1ec3u s\u01a1 \u0111\u1ed3 nhanh ch\u00f3ng.<\/p>\n

              B\u1ea3ng tham chi\u1ebfu c\u00e1c ph\u1ea7n t\u1eed ph\u1ed5 bi\u1ebfn \ud83d\udccb<\/h2>\n

              \u0110\u1ec3 h\u1ed7 tr\u1ee3 qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng tham chi\u1ebfu cho c\u00e1c ph\u1ea7n t\u1eed chu\u1ea9n v\u00e0 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng m\u00e3 c\u1ee7a ch\u00fang.<\/p>\n\n\n\n\n\n\n\n\n\n
              Ph\u1ea7n t\u1eed UML<\/strong><\/th>\nBi\u1ec3u di\u1ec5n tr\u1ef1c quan<\/strong><\/th>\nT\u01b0\u01a1ng \u0111\u01b0\u01a1ng m\u00e3<\/strong><\/th>\nM\u1ee5c \u0111\u00edch<\/strong><\/th>\n<\/tr>\n
              Ng\u01b0\u1eddi t\u00e1c nh\u00e2n<\/strong><\/td>\nH\u00ecnh ng\u01b0\u1eddi que<\/td>\nAPI b\u00ean ngo\u00e0i, Ng\u01b0\u1eddi d\u00f9ng, B\u1ed9 l\u1eadp l\u1ecbch<\/td>\nKh\u1edfi t\u1ea1o qu\u00e1 tr\u00ecnh<\/td>\n<\/tr>\n
              D\u00e2y s\u1ed1ng<\/strong><\/td>\n\u0110\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng g\u1ea1ch ch\u1ea5m<\/td>\nTh\u1ec3 hi\u1ec7n l\u1edbp<\/td>\nBi\u1ec3u di\u1ec5n s\u1ef1 t\u1ed3n t\u1ea1i theo th\u1eddi gian<\/td>\n<\/tr>\n
              Tin nh\u1eafn<\/strong><\/td>\nM\u0169i t\u00ean ngang<\/td>\nG\u1ecdi ph\u01b0\u01a1ng th\u1ee9c<\/td>\nGiao ti\u1ebfp gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n
              Thanh k\u00edch ho\u1ea1t<\/strong><\/td>\nH\u1ed9p h\u00ecnh ch\u1eef nh\u1eadt<\/td>\nKh\u1ed1i th\u1ef1c thi ph\u01b0\u01a1ng th\u1ee9c<\/td>\nCh\u1ec9 ra qu\u00e1 tr\u00ecnh x\u1eed l\u00fd \u0111ang ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n
              Tin nh\u1eafn tr\u1ea3 v\u1ec1<\/strong><\/td>\nM\u0169i t\u00ean g\u1ea1ch (h\u1edf)<\/td>\nC\u00e2u l\u1ec7nh tr\u1ea3 v\u1ec1<\/td>\nPh\u1ea3n h\u1ed3i cho ng\u01b0\u1eddi g\u1ecdi<\/td>\n<\/tr>\n
              Kh\u1ed1i (t\u00f9y ch\u1ecdn)<\/strong><\/td>\nH\u1ed9p v\u1edbi [\u0110i\u1ec1u ki\u1ec7n]<\/td>\nKh\u1ed1i If \/ Else<\/td>\nC\u00e1c nh\u00e1nh logic \u0111i\u1ec1u ki\u1ec7n<\/td>\n<\/tr>\n
              Kh\u1ed1i (v\u00f2ng l\u1eb7p)<\/strong><\/td>\nH\u1ed9p v\u1edbi nh\u00e3n \u201cV\u00f2ng l\u1eb7p\u201d<\/td>\nV\u00f2ng l\u1eb7p For \/ While<\/td>\nTh\u1ef1c thi l\u1eb7p l\u1ea1i<\/td>\n<\/tr>\n<\/table>\n

              Nh\u1eefng sai l\u1ea7m c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n

              Ngay c\u1ea3 khi quy tr\u00ecnh r\u00f5 r\u00e0ng, l\u1ed7i v\u1eabn c\u00f3 th\u1ec3 l\u1ecdt v\u00e0o t\u00e0i li\u1ec7u. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n

                \n
              • Qu\u00e1 t\u1ea3i m\u1ed9t s\u01a1 \u0111\u1ed3 duy nh\u1ea5t:<\/strong> C\u1ed1 g\u1eafng th\u1ec3 hi\u1ec7n to\u00e0n b\u1ed9 v\u00f2ng \u0111\u1eddi h\u1ec7 th\u1ed1ng trong m\u1ed9t h\u00ecnh \u1ea3nh s\u1ebd khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f3 \u0111\u1ecdc. H\u00e3y chia h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p th\u00e0nh nhi\u1ec1u s\u01a1 \u0111\u1ed3 ri\u00eang bi\u1ec7t cho t\u1eebng t\u00ednh n\u0103ng.<\/li>\n
              • B\u1ecf qua y\u1ebfu t\u1ed1 th\u1eddi gian:<\/strong> M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 kh\u00f4ng ph\u1ea3i l\u00e0 s\u01a1 \u0111\u1ed3 th\u1eddi gian, nh\u01b0ng th\u1ee9 t\u1ef1 v\u1eabn quan tr\u1ecdng. \u0110\u1ea3m b\u1ea3o th\u1ee9 t\u1ef1 d\u1ecdc c\u1ee7a c\u00e1c tin nh\u1eafn ph\u00f9 h\u1ee3p v\u1edbi tr\u00ecnh t\u1ef1 th\u1ef1c thi h\u1ee3p l\u00fd.<\/li>\n
              • B\u1ecf qua tin nh\u1eafn tr\u1ea3 v\u1ec1:<\/strong> \u1ede m\u1ed9t s\u1ed1 phong c\u00e1ch, tin nh\u1eafn tr\u1ea3 v\u1ec1 l\u00e0 t\u00f9y ch\u1ecdn. Tuy nhi\u00ean, trong qu\u00e1 tr\u00ecnh t\u00e1i c\u1ea5u tr\u00fac, vi\u1ec7c hi\u1ec3n th\u1ecb lu\u1ed3ng d\u1eef li\u1ec7u tr\u1ea3 v\u1ec1 s\u1ebd gi\u00fap hi\u1ec3u r\u00f5 c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n ng\u01b0\u1ee3c l\u00ean ng\u0103n x\u1ebfp.<\/li>\n
              • S\u1ef1 m\u01a1 h\u1ed3 trong \u0111\u1eb7t t\u00ean:<\/strong> S\u1eed d\u1ee5ng c\u00e1c t\u00ean chung chung nh\u01b0 \u201cQuy tr\u00ecnh\u201d ho\u1eb7c \u201cD\u1eef li\u1ec7u\u201d s\u1ebd khi\u1ebfn s\u01a1 \u0111\u1ed3 tr\u1edf n\u00ean v\u00f4 d\u1ee5ng. H\u00e3y s\u1eed d\u1ee5ng thu\u1eadt ng\u1eef chuy\u00ean ng\u00e0nh.<\/li>\n
              • Nh\u1ea7m l\u1eabn gi\u1eefa t\u0129nh v\u00e0 \u0111\u1ed9ng:<\/strong>\u0110\u1eebng nh\u1ea7m l\u1eabn m\u1ed1i quan h\u1ec7 l\u1edbp v\u1edbi lu\u1ed3ng tin nh\u1eafn. S\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 n\u00f3i v\u1ec1 h\u00e0nh vi, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u1ea5u tr\u00fac.<\/li>\n<\/ul>\n

                T\u00edch h\u1ee3p s\u01a1 \u0111\u1ed3 v\u00e0o quy tr\u00ecnh l\u00e0m vi\u1ec7c \ud83d\udd04<\/h2>\n

                Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 l\u00e0 m\u1ed9t n\u1ed7 l\u1ef1c duy nh\u1ea5t n\u1ebfu m\u00e3 ngu\u1ed3n kh\u00f4ng thay \u0111\u1ed5i. Tuy nhi\u00ean, m\u00e3 ngu\u1ed3n lu\u00f4n thay \u0111\u1ed5i. \u0110\u1ec3 duy tr\u00ec t\u00ednh h\u1eefu \u00edch c\u1ee7a t\u00e0i li\u1ec7u, n\u00f3 ph\u1ea3i l\u00e0 m\u1ed9t ph\u1ea7n trong quy tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n

                Khi th\u00eam t\u00ednh n\u0103ng m\u1edbi, b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean n\u00ean l\u00e0 c\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o logic m\u1edbi \u0111\u01b0\u1ee3c hi\u1ec3u r\u00f5 tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c vi\u1ebft. Khi t\u00e1i c\u1ea5u tr\u00fac, s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 tr\u1ea1ng th\u00e1i m\u1ee5c ti\u00eau. M\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c thay \u0111\u1ed5i cho \u0111\u1ebfn khi ph\u00f9 h\u1ee3p v\u1edbi s\u01a1 \u0111\u1ed3.<\/p>\n

                Th\u00f3i quen n\u00e0y t\u1ea1o ra m\u1ed9t v\u00f2ng ph\u1ea3n h\u1ed3i. M\u00e3 ngu\u1ed3n cung c\u1ea5p th\u00f4ng tin cho s\u01a1 \u0111\u1ed3, v\u00e0 s\u01a1 \u0111\u1ed3 cung c\u1ea5p th\u00f4ng tin cho m\u00e3 ngu\u1ed3n. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m nguy c\u01a1 ph\u00e1t sinh s\u1ef1 l\u1ec7ch l\u1ea1c ki\u1ebfn tr\u00fac.<\/p>\n

                K\u1ebft lu\u1eadn v\u1ec1 Ki\u1ebfn tr\u00fac s\u1ea1ch \ud83c\udfd7\ufe0f<\/h2>\n

                Chuy\u1ec3n m\u00e3 ngu\u1ed3n l\u1ed9n x\u1ed9n th\u00e0nh s\u01a1 \u0111\u1ed3 s\u1ea1ch l\u00e0 m\u1ed9t b\u00e0i t\u1eadp v\u1ec1 k\u1ef7 lu\u1eadt. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 s\u1eb5n s\u00e0ng d\u1eebng l\u1ea1i v\u00e0 quan s\u00e1t tr\u01b0\u1edbc khi h\u00e0nh \u0111\u1ed9ng. N\u1ed7 l\u1ef1c \u0111\u1ea7u t\u01b0 v\u00e0o t\u00e0i li\u1ec7u s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch trong vi\u1ec7c gi\u1ea3m th\u1eddi gian g\u1ee1 l\u1ed7i v\u00e0 giao ti\u1ebfp r\u00f5 r\u00e0ng h\u01a1n. B\u1eb1ng c\u00e1ch tu\u00e2n theo c\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c n\u00eau tr\u00ean, c\u00e1c \u0111\u1ed9i nh\u00f3m c\u00f3 th\u1ec3 l\u1ea5y l\u1ea1i quy\u1ec1n ki\u1ec3m so\u00e1t h\u1ec7 th\u1ed1ng c\u1ee7a m\u00ecnh. K\u1ebft qu\u1ea3 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t b\u1ee9c tranh, m\u00e0 c\u00f2n l\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc h\u01a1n v\u1ec1 ph\u1ea7n m\u1ec1m m\u00e0 h\u1ecd duy tr\u00ec. S\u1ef1 hi\u1ec3u bi\u1ebft n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng cho ph\u00e1t tri\u1ec3n b\u1ec1n v\u1eefng.<\/p>\n

                T\u1eadp trung v\u00e0o lu\u1ed3ng. T\u00f4n tr\u1ecdng d\u1eef li\u1ec7u. Ghi ch\u00e9p t\u01b0\u01a1ng t\u00e1c. L\u00e0m nh\u01b0 v\u1eady, h\u1ed7n lo\u1ea1n s\u1ebd tr\u1edf th\u00e0nh tr\u1eadt t\u1ef1, v\u00e0 ph\u1ee9c t\u1ea1p s\u1ebd tr\u1edf th\u00e0nh r\u00f5 r\u00e0ng. Con \u0111\u01b0\u1eddng ph\u00eda tr\u01b0\u1edbc \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi nh\u1eefng \u0111\u01b0\u1eddng n\u00e9t b\u1ea1n v\u1ebd ngay b\u00e2y gi\u1edd.<\/p>\n","protected":false},"excerpt":{"rendered":"

                C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m ph\u00e1t tri\u1ec3n theo th\u1eddi gian. Nh\u1eefng g\u00ec b\u1eaft \u0111\u1ea7u nh\u01b0 m\u1ed9t \u0111o\u1ea1n m\u00e3 \u0111\u01a1n gi\u1ea3n th\u01b0\u1eddng ph\u00e1t tri\u1ec3n th\u00e0nh m\u1ed9t m\u1ea1ng l\u01b0\u1edbi ph\u1ee9c t\u1ea1p c\u00e1c…<\/p>\n","protected":false},"author":1,"featured_media":1833,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"T\u00e1i c\u1ea5u tr\u00fac h\u1ed7n lo\u1ea1n: H\u01b0\u1edbng d\u1eabn v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 UML","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch bi\u1ebfn m\u00e3 ngu\u1ed3n l\u1ed9n x\u1ed9n th\u00e0nh s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 UML s\u1ea1ch s\u1ebd. 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