{"id":1130,"date":"2026-03-28T15:24:39","date_gmt":"2026-03-28T15:24:39","guid":{"rendered":"https:\/\/www.method-post.com\/vi\/attributes-vs-methods-class-diagrams\/"},"modified":"2026-03-28T15:24:39","modified_gmt":"2026-03-28T15:24:39","slug":"attributes-vs-methods-class-diagrams","status":"publish","type":"post","link":"https:\/\/www.method-post.com\/vi\/attributes-vs-methods-class-diagrams\/","title":{"rendered":"Ng\u1eebng Nh\u1ea7m L\u1eabn Thu\u1ed9c T\u00ednh V\u1edbi Ph\u01b0\u01a1ng Th\u1ee9c: H\u01b0\u1edbng D\u1eabn Ph\u00e1 B\u1ecf Suy Ngh\u0129 Sai L\u1ea7m \u0110\u1ec3 V\u1ebd S\u01a1 \u0110\u1ed3 L\u1edbp Ch\u00ednh X\u00e1c"},"content":{"rendered":"

Trong b\u1ed1i c\u1ea3nh ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t s\u1edf th\u00edch th\u1ea9m m\u1ef9; n\u00f3 l\u00e0 n\u1ec1n t\u1ea3ng cho kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec. M\u1ed9t trong nh\u1eefng ngu\u1ed3n g\u00e2y m\u01a1 h\u1ed3 dai d\u1eb3ng nh\u1ea5t trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c nh\u1ea7m l\u1eabn gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c trong s\u01a1 \u0111\u1ed3 l\u1edbp. Khi ranh gi\u1edbi gi\u1eefa tr\u1ea1ng th\u00e1i v\u00e0 h\u00e0nh vi tr\u1edf n\u00ean m\u1edd nh\u1ea1t, c\u00e1c s\u01a1 \u0111\u1ed3 k\u1ebft qu\u1ea3 s\u1ebd kh\u00f4ng truy\u1ec1n \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c \u0111\u00edch m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. S\u1ef1 nh\u1ea7m l\u1eabn n\u00e0y lan truy\u1ec1n qua to\u00e0n b\u1ed9 v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n, d\u1eabn \u0111\u1ebfn sai s\u00f3t trong tri\u1ec3n khai, k\u1ef3 v\u1ecdng c\u1ee7a nh\u00f3m kh\u00f4ng \u0111\u1ed3ng b\u1ed9 v\u00e0 n\u1ee3 k\u1ef9 thu\u1eadt t\u00edch t\u1ee5 \u00e2m th\u1ea7m.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u00f3ng vai tr\u00f2 l\u00e0 ngu\u1ed3n t\u00e0i li\u1ec7u x\u00e1c th\u1ef1c \u0111\u1ec3 hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ea5u tr\u00fac gi\u1eefa hai th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i n\u00e0y trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch vai tr\u00f2, bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u00e0 t\u00e1c \u0111\u1ed9ng ch\u1ee9c n\u0103ng c\u1ee7a ch\u00fang, ch\u00fang ta x\u00e2y d\u1ef1ng m\u1ed9t khung r\u00f5 r\u00e0ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp ph\u1ea3n \u00e1nh \u0111\u00fang logic c\u1ee7a h\u1ec7 th\u1ed1ng. D\u00f9 b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t d\u1ecbch v\u1ee5 vi m\u00f4 hay m\u1ed9t \u1ee9ng d\u1ee5ng \u0111\u01a1n th\u1ec3, s\u1ef1 r\u00f5 r\u00e0ng trong m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ea3m b\u1ea3o m\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c vi\u1ebft s\u1ebd ph\u00f9 h\u1ee3p v\u1edbi t\u1ea7m nh\u00ecn \u0111\u00e3 ghi l\u1ea1i.<\/p>\n

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\"Cartoon<\/figure>\n<\/div>\n

Hi\u1ec3u R\u00f5 N\u1ec1n T\u1ea3ng C\u1ee7a Thi\u1ebft K\u1ebf H\u01b0\u1edbng \u0110\u1ed1i T\u01b0\u1ee3ng \ud83c\udfd7\ufe0f<\/h2>\n

L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP) d\u1ef1a tr\u00ean kh\u00e1i ni\u1ec7m \u0111\u00f3ng g\u00f3i \u0111\u1ec3 t\u1ed5 ch\u1ee9c m\u00e3 ngu\u1ed3n. M\u1ed9t l\u1edbp \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf, \u0111\u1ecbnh ngh\u0129a \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec v\u00e0 l\u00e0m g\u00ec. Trong b\u1ea3n v\u1ebd n\u00e0y, t\u1ed3n t\u1ea1i hai danh m\u1ee5c ch\u00ednh: d\u1eef li\u1ec7u m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng l\u01b0u tr\u1eef v\u00e0 c\u00e1c h\u00e0nh \u0111\u1ed9ng m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c hi\u1ec7n. Vi\u1ec7c nh\u1ea7m l\u1eabn hai danh m\u1ee5c n\u00e0y s\u1ebd l\u00e0m suy y\u1ebfu nguy\u00ean t\u1eafc t\u00e1ch bi\u1ec7t tr\u00e1ch nhi\u1ec7m.<\/p>\n

Khi m\u1ed9t s\u01a1 \u0111\u1ed3 tr\u1ed9n l\u1eabn hai kh\u00e1i ni\u1ec7m n\u00e0y, n\u00f3 s\u1ebd l\u00e0m m\u1edd d\u00f2ng ch\u1ea3y d\u1eef li\u1ec7u v\u00e0 d\u00f2ng ch\u1ea3y logic. C\u00e1c b\u00ean li\u00ean quan \u0111\u1ecdc s\u01a1 \u0111\u1ed3 s\u1ebd kh\u00f3 x\u00e1c \u0111\u1ecbnh ph\u1ea7n n\u00e0o c\u1ee7a h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 thay \u0111\u1ed5i v\u00e0 ph\u1ea7n n\u00e0o l\u00e0 x\u00e1c \u0111\u1ecbnh. \u0110\u1ec3 tr\u00e1nh \u0111i\u1ec1u n\u00e0y, ch\u00fang ta ph\u1ea3i nghi\u00eam ng\u1eb7t \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng \u0111\u00e2u l\u00e0 thu\u1ed9c t\u00ednh, \u0111\u00e2u l\u00e0 ph\u01b0\u01a1ng th\u1ee9c tr\u01b0\u1edbc khi v\u1ebd b\u1ea5t k\u1ef3 \u0111\u01b0\u1eddng n\u00e9t n\u00e0o.<\/p>\n

    \n
  • R\u00f5 r\u00e0ng:<\/strong> C\u00e1c s\u01a1 \u0111\u1ed3 ch\u00ednh x\u00e1c gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c cho nh\u00e0 ph\u00e1t tri\u1ec3n.<\/li>\n
  • Giao ti\u1ebfp:<\/strong> Ch\u00fang \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t ng\u00f4n ng\u1eef chung gi\u1eefa ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 k\u1ef9 s\u01b0.<\/li>\n
  • T\u00e1i c\u1ea5u tr\u00fac:<\/strong> Nh\u1eefng s\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u00fap vi\u1ec7c s\u1eeda \u0111\u1ed5i m\u00e3 ngu\u1ed3n tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n m\u00e0 kh\u00f4ng l\u00e0m g\u00e3y c\u00e1c ph\u1ee5 thu\u1ed9c.<\/li>\n<\/ul>\n

    \u0110\u1ecbnh Ngh\u0129a Thu\u1ed9c T\u00ednh: Tr\u1ea1ng Th\u00e1i C\u1ee7a \u0110\u1ed1i T\u01b0\u1ee3ng \ud83d\udce6<\/h2>\n

    Thu\u1ed9c t\u00ednh \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang l\u00e0 c\u00e1c bi\u1ebfn l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1i b\u1ea5t k\u1ef3 th\u1eddi \u0111i\u1ec3m n\u00e0o. H\u00e3y h\u00ecnh dung thu\u1ed9c t\u00ednh nh\u01b0 c\u00e1c \u0111\u1eb7c t\u00ednh v\u1eadt l\u00fd c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 th\u1ebf gi\u1edbi th\u1ef1c. N\u1ebfu m\u1ed9t l\u1edbp \u0111\u1ea1i di\u1ec7n cho m\u1ed9t T\u00e0i Kho\u1ea3n Ng\u00e2n H\u00e0ng<\/code>, s\u1ed1 d\u01b0, t\u00ean ch\u1ee7 t\u00e0i kho\u1ea3n v\u00e0 l\u00e3i su\u1ea5t hi\u1ec7n t\u1ea1i l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh. Ch\u00fang m\u00f4 t\u1ea3 \u0111i\u1ec1u g\u00ec<\/em>\u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111i\u1ec1u g\u00ec<\/em>n\u00f3 l\u00e0m.<\/p>\n

    C\u00e1c thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong b\u1ed9 nh\u1edb. Khi m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o, b\u1ed9 nh\u1edb s\u1ebd \u0111\u01b0\u1ee3c c\u1ea5p ph\u00e1t cho c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a n\u00f3. Nh\u1eefng gi\u00e1 tr\u1ecb n\u00e0y c\u00f3 th\u1ec3 thay \u0111\u1ed5i trong su\u1ed1t v\u00f2ng \u0111\u1eddi c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng, nh\u01b0ng ch\u00fang \u0111\u1ea1i di\u1ec7n cho d\u1eef li\u1ec7u, ch\u1ee9 kh\u00f4ng ph\u1ea3i logic. Vi\u1ec7c thay \u0111\u1ed5i m\u1ed9t thu\u1ed9c t\u00ednh tr\u1ef1c ti\u1ebfp s\u1ebd l\u00e0m thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i c\u1ee7a th\u1ec3 hi\u1ec7n.<\/p>\n

    \u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a thu\u1ed9c t\u00ednh<\/h3>\n
      \n
    • L\u01b0u tr\u1eef d\u1eef li\u1ec7u:<\/strong> Ch\u00fang chi\u1ebfm d\u1ee5ng kh\u00f4ng gian b\u1ed9 nh\u1edb trong th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
    • T\u00ednh ch\u1ea5t th\u1ee5 \u0111\u1ed9ng:<\/strong> C\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng th\u1ef1c thi m\u00e3 l\u1ec7nh. Ch\u00fang n\u1eb1m im l\u1eb7ng cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c truy c\u1eadp ho\u1eb7c thay \u0111\u1ed5i.<\/li>\n
    • T\u00ednh kh\u1ea3 ki\u1ebfn:<\/strong> Ch\u00fang th\u01b0\u1eddng c\u00f3 c\u00e1c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n kh\u1ea3 ki\u1ebfn nh\u01b0 public, private ho\u1eb7c protected \u0111\u1ec3 ki\u1ec3m so\u00e1t truy c\u1eadp.<\/li>\n
    • Lo\u1ea1i:<\/strong> Ch\u00fang l\u01b0u tr\u1eef c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: s\u1ed1 nguy\u00ean, chu\u1ed7i, boolean, tham chi\u1ebfu \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c).<\/li>\n<\/ul>\n

      Xem x\u00e9t m\u1ed9t UserProfile<\/code> l\u1edbp. C\u00e1c email<\/code>, registrationDate<\/code>, v\u00e0 isVerified<\/code> l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh. Ch\u00fang m\u00f4 t\u1ea3 ng\u01b0\u1eddi d\u00f9ng. Ch\u00fang kh\u00f4ng g\u1eedi email hay ki\u1ec3m tra tr\u1ea1ng th\u00e1i x\u00e1c minh; ch\u00fang ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u01b0u gi\u1eef c\u00e1c gi\u00e1 tr\u1ecb li\u00ean quan \u0111\u1ebfn nh\u1eefng kh\u00e1i ni\u1ec7m \u0111\u00f3.<\/p>\n

      \u0110\u1ecbnh ngh\u0129a Ph\u01b0\u01a1ng th\u1ee9c: H\u00e0nh vi c\u1ee7a \u0110\u1ed1i t\u01b0\u1ee3ng \ud83d\ude80<\/h2>\n

      C\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ea1i di\u1ec7n cho h\u00e0nh vi c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang l\u00e0 c\u00e1c h\u00e0m ho\u1eb7c th\u1ee7 t\u1ee5c m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 th\u1ef1c thi. N\u1ebfu m\u1ed9t thu\u1ed9c t\u00ednh l\u00e0 tr\u1ea1ng th\u00e1i, th\u00ec m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c l\u00e0 h\u00e0nh \u0111\u1ed9ng. Trong v\u00ed d\u1ee5 BankAccount<\/code> v\u00ed d\u1ee5, kh\u1ea3 n\u0103ng n\u1ea1p ti\u1ec1n<\/code>, r\u00fat ti\u1ec1n<\/code>, ho\u1eb7c chuy\u1ec3n kho\u1ea3n<\/code> ti\u1ec1n l\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c. Ch\u00fang m\u00f4 t\u1ea3 c\u00e1ch<\/em>\u0111\u1ed1i t\u01b0\u1ee3ng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

      C\u00e1c ph\u01b0\u01a1ng th\u1ee9c ch\u1ee9a logic. Ch\u00fang c\u00f3 th\u1ec3 \u0111\u1ecdc c\u00e1c thu\u1ed9c t\u00ednh, thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh, g\u1ecdi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c kh\u00e1c ho\u1eb7c t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i. M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c l\u00e0 \u0111\u1ed9ng; n\u00f3 th\u1ef1c thi m\u00e3. Trong khi c\u00e1c thu\u1ed9c t\u00ednh l\u00e0 b\u1ed9 nh\u1edb t\u0129nh, th\u00ec c\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u00e0 c\u00e1c qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

      \u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a c\u00e1c ph\u01b0\u01a1ng th\u1ee9c<\/h3>\n
        \n
      • Th\u1ef1c thi:<\/strong> Ch\u00fang ch\u1ee9a logic ho\u1eb7c thu\u1eadt to\u00e1n c\u00f3 th\u1ec3 th\u1ef1c thi.<\/li>\n
      • \u0110\u1ea7u v\u00e0o\/\u0110\u1ea7u ra:<\/strong> Ch\u00fang ch\u1ea5p nh\u1eadn tham s\u1ed1 v\u00e0 c\u00f3 th\u1ec3 tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb.<\/li>\n
      • T\u00e1c d\u1ee5ng ph\u1ee5:<\/strong> Ch\u00fang c\u00f3 th\u1ec3 thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng (b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i c\u00e1c thu\u1ed9c t\u00ednh) ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
      • Tr\u1eebu t\u01b0\u1ee3ng:<\/strong> H\u1ecd \u1ea9n c\u00e1c chi ti\u1ebft tri\u1ec3n khai kh\u1ecfi ng\u01b0\u1eddi g\u1ecdi.<\/li>\n<\/ul>\n

        Trong m\u1ed9t OrderProcessing<\/code> h\u1ec7 th\u1ed1ng, m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 calculateTotal<\/code> nh\u1eadn \u0111\u1ea7u v\u00e0o (gi\u00e1 m\u1eb7t h\u00e0ng, s\u1ed1 l\u01b0\u1ee3ng) v\u00e0 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3. M\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 processPayment<\/code>c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t m\u1ed9t d\u1ecbch v\u1ee5 giao d\u1ecbch b\u00ean ngo\u00e0i. \u0110\u00e2y l\u00e0 c\u00e1c h\u00e0nh vi, ch\u1ee9 kh\u00f4ng ph\u1ea3i d\u1eef li\u1ec7u.<\/p>\n

        Ng\u00f4n ng\u1eef tr\u1ef1c quan c\u1ee7a UML \ud83c\udfa8<\/h2>\n

        Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML) cung c\u1ea5p c\u00fa ph\u00e1p chu\u1ea9n \u0111\u1ec3 v\u1ebd s\u01a1 \u0111\u1ed3 l\u1edbp. Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea5t k\u1ef3 ai \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ec1u hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c m\u00e0 kh\u00f4ng c\u1ea7n suy \u0111o\u00e1n. Bi\u1ec3u di\u1ec5n tr\u1ef1c quan l\u00e0 tuy\u1ebfn ph\u00f2ng th\u1ee7 \u0111\u1ea7u ti\u00ean ch\u1ed1ng l\u1ea1i s\u1ef1 nh\u1ea7m l\u1eabn.<\/p>\n

        K\u00fd hi\u1ec7u chu\u1ea9n<\/h3>\n

        Trong m\u1ed9t h\u1ed9p s\u01a1 \u0111\u1ed3 l\u1edbp chu\u1ea9n, l\u1edbp \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n. Ph\u1ea7n tr\u00ean ch\u1ee9a t\u00ean l\u1edbp. Ph\u1ea7n gi\u1eefa li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh. Ph\u1ea7n d\u01b0\u1edbi li\u1ec7t k\u00ea c\u00e1c ph\u01b0\u01a1ng th\u1ee9c. S\u1ef1 ph\u00e2n t\u00e1ch theo chi\u1ec1u d\u1ecdc n\u00e0y l\u00e0 c\u00f3 ch\u1ee7 \u00fd v\u00e0 ph\u1ea3i \u0111\u01b0\u1ee3c t\u00f4n tr\u1ecdng.<\/p>\n

        C\u00e1c b\u1ed9 s\u1eeda \u0111\u1ed5i t\u00ednh kh\u1ea3 d\u1ee5ng c\u0169ng r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ph\u00e2n bi\u1ec7t tr\u1ef1c quan. C\u00e1c k\u00fd hi\u1ec7u ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

          \n
        • +<\/strong> \u0111\u1ec3 ch\u1ec9 kh\u1ea3 d\u1ee5ng c\u00f4ng khai.<\/li>\n
        • \u2013<\/strong> \u0111\u1ec3 ch\u1ec9 kh\u1ea3 d\u1ee5ng ri\u00eang t\u01b0.<\/li>\n
        • #<\/strong> \u0111\u1ec3 ch\u1ec9 kh\u1ea3 d\u1ee5ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/li>\n
        • ~<\/strong> \u0111\u1ec3 ch\u1ec9 kh\u1ea3 d\u1ee5ng g\u00f3i.<\/li>\n<\/ul>\n

          V\u00ed d\u1ee5, + balance: int<\/code> ch\u1ec9 ra m\u1ed9t thu\u1ed9c t\u00ednh c\u00f4ng khai t\u00ean l\u00e0 balance c\u00f3 ki\u1ec3u s\u1ed1 nguy\u00ean. - calculateTax(): float<\/code> ch\u1ec9 ra m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c ri\u00eang t\u01b0 t\u00ean l\u00e0 calculateTax tr\u1ea3 v\u1ec1 ki\u1ec3u float. D\u1ea5u hai ch\u1ea5m t\u00e1ch bi\u1ec7t t\u00ean v\u1edbi ki\u1ec3u \u0111\u1ed1i v\u1edbi thu\u1ed9c t\u00ednh, trong khi d\u1ea5u ngo\u1eb7c tr\u00f2n ch\u1ec9 \u0111\u1ecbnh k\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

          Danh s\u00e1ch ki\u1ec3m tra tr\u1ef1c quan cho s\u01a1 \u0111\u1ed3<\/h3>\n
            \n
          • C\u00e1c thu\u1ed9c t\u00ednh c\u00f3 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ng\u0103n gi\u1eefa kh\u00f4ng?<\/li>\n
          • C\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ng\u0103n d\u01b0\u1edbi kh\u00f4ng?<\/li>\n
          • C\u00e1c thu\u1ed9c t\u00ednh c\u00f3 thi\u1ebfu d\u1ea5u ngo\u1eb7c tr\u00f2n kh\u00f4ng?<\/li>\n
          • C\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f3 bao g\u1ed3m d\u1ea5u ngo\u1eb7c \u0111\u01a1n kh\u00f4ng?<\/li>\n<\/ul>\n

            Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn v\u00e0 nh\u1eefng hi\u1ec3u l\u1ea7m \u2753<\/h2>\n

            M\u1eb7c d\u00f9 \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng, nh\u01b0ng v\u1eabn t\u1ed3n t\u1ea1i nhi\u1ec1u hi\u1ec3u l\u1ea7m trong t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt. Nh\u1eefng hi\u1ec3u l\u1ea7m n\u00e0y th\u01b0\u1eddng xu\u1ea5t ph\u00e1t t\u1eeb c\u00e1ch vi\u1ebft m\u00e3 ngu\u1ed3n so v\u1edbi c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a n\u00f3. Vi\u1ec7c gi\u1ea3i quy\u1ebft nh\u1eefng hi\u1ec3u l\u1ea7m n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 lo\u1ea1i b\u1ecf nh\u1eefng hi\u1ec3u l\u1ea7m sai l\u1ec7ch.<\/p>\n

            Hi\u1ec3u l\u1ea7m 1: C\u00e1c ph\u01b0\u01a1ng th\u1ee9c l\u1ea5y v\u00e0 thi\u1ebft l\u1eadp l\u00e0 thu\u1ed9c t\u00ednh<\/h3>\n

            Th\u01b0\u1eddng th\u1ea5ygetBalance<\/code> ho\u1eb7c setBalance<\/code>\u0111\u01b0\u1ee3c li\u1ec7t k\u00ea b\u00ean c\u1ea1nh c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u. V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, ch\u00fang l\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c. Ch\u00fang l\u00e0 nh\u1eefng h\u00e0m truy xu\u1ea5t ho\u1eb7c thay \u0111\u1ed5i m\u1ed9t thu\u1ed9c t\u00ednh. M\u1eb7c d\u00f9 ch\u00fang cung c\u1ea5p truy c\u1eadp \u0111\u1ebfn d\u1eef li\u1ec7u, nh\u01b0ng ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 d\u1eef li\u1ec7u b\u1ea3n th\u00e2n.<\/p>\n

              \n
            • T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng:<\/strong>Li\u1ec7t k\u00ea ch\u00fang nh\u01b0 thu\u1ed9c t\u00ednh ng\u1ee5 \u00fd vi\u1ec7c l\u01b0u tr\u1eef. Li\u1ec7t k\u00ea ch\u00fang nh\u01b0 ph\u01b0\u01a1ng th\u1ee9c ng\u1ee5 \u00fd logic.<\/li>\n
            • Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t:<\/strong>Gom ch\u00fang v\u00e0o ph\u1ea7n ph\u01b0\u01a1ng th\u1ee9c, ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1eb7c bi\u1ec7t nh\u01b0 <<getter>><\/code>n\u1ebfu c\u00f4ng c\u1ee5 cho ph\u00e9p, nh\u01b0ng h\u00e3y gi\u1eef ch\u00fang t\u00e1ch bi\u1ec7t kh\u1ecfi c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u th\u00f4.<\/li>\n<\/ul>\n

              Hi\u1ec3u l\u1ea7m 2: Thu\u1ed9c t\u00ednh l\u00e0 thu\u1ed9c t\u00ednh<\/h3>\n

              Trong m\u1ed9t s\u1ed1 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh, thu\u1ed9c t\u00ednh k\u1ebft h\u1ee3p gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c. M\u1ed9t thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t tr\u01b0\u1eddng trong m\u00e3 ngu\u1ed3n nh\u01b0ng th\u1ef1c t\u1ebf l\u1ea1i th\u1ef1c thi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c l\u1ea5y d\u1eef li\u1ec7u \u1ea9n ph\u00eda sau. Tuy nhi\u00ean, trong s\u01a1 \u0111\u1ed3 l\u1edbp, t\u1ed1t nh\u1ea5t l\u00e0 m\u00f4 h\u00ecnh h\u00f3a theo \u00fd \u0111\u1ecbnh logic.<\/p>\n

                \n
              • N\u1ebfu thu\u1ed9c t\u00ednh ch\u1ec9 l\u00e0 n\u01a1i l\u01b0u tr\u1eef, h\u00e3y m\u00f4 h\u00ecnh h\u00f3a n\u00f3 nh\u01b0 m\u1ed9t thu\u1ed9c t\u00ednh.<\/li>\n
              • N\u1ebfu thu\u1ed9c t\u00ednh li\u00ean quan \u0111\u1ebfn ki\u1ec3m tra t\u00ednh h\u1ee3p l\u1ec7 ho\u1eb7c t\u00ednh to\u00e1n khi truy c\u1eadp, h\u00e3y m\u00f4 h\u00ecnh h\u00f3a n\u00f3 nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c m\u1ed9t k\u00fd hi\u1ec7u thu\u1ed9c t\u00ednh chuy\u00ean bi\u1ec7t.<\/li>\n
              • R\u00f5 r\u00e0ng:<\/strong>Kh\u00f4ng n\u00ean d\u1ef1a v\u00e0o c\u00fa ph\u00e1p \u0111\u1eb7c th\u00f9 ng\u00f4n ng\u1eef. H\u00e3y tu\u00e2n theo m\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m.<\/li>\n<\/ul>\n

                Hi\u1ec3u l\u1ea7m 3: C\u00e1c th\u00e0nh vi\u00ean t\u0129nh lu\u00f4n l\u00e0 ph\u01b0\u01a1ng th\u1ee9c<\/h3>\n

                C\u00e1c th\u00e0nh vi\u00ean t\u0129nh thu\u1ed9c v\u1ec1 l\u1edbp ch\u1ee9 kh\u00f4ng ph\u1ea3i th\u1ec3 hi\u1ec7n. M\u1ed9t bi\u1ebfn t\u0129nh v\u1eabn l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh (n\u00f3 l\u01b0u tr\u1eef tr\u1ea1ng th\u00e1i chia s\u1ebb b\u1edfi t\u1ea5t c\u1ea3 c\u00e1c th\u1ec3 hi\u1ec7n). M\u1ed9t h\u00e0m t\u0129nh v\u1eabn l\u00e0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c. Vi\u1ec7c nh\u1ea7m l\u1eabn gi\u1eefa thu\u1ed9c t\u00ednh t\u0129nh v\u00e0 thu\u1ed9c t\u00ednh th\u1ec3 hi\u1ec7n l\u00e0 m\u1ed9t l\u1ed7i ph\u1ed5 bi\u1ebfn, nh\u01b0ng vi\u1ec7c nh\u1ea7m l\u1eabn gi\u1eefa th\u00e0nh vi\u00ean t\u0129nh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c th\u00ec \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n. Tuy nhi\u00ean, \u0111\u1ea3m b\u1ea3o s\u1ef1 ph\u00e2n t\u00e1ch r\u00f5 r\u00e0ng v\u1eabn l\u00e0 \u0111i\u1ec1u then ch\u1ed1t.<\/p>\n

                Hi\u1ec7u \u1ee9ng lan truy\u1ec1n \u0111\u1ed1i v\u1edbi ki\u1ebfn tr\u00fac \ud83c\udf0a<\/h2>\n

                Khi c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c b\u1ecb nh\u1ea7m l\u1eabn trong s\u01a1 \u0111\u1ed3, t\u00e1c \u0111\u1ed9ng kh\u00f4ng ch\u1ec9 gi\u1edbi h\u1ea1n \u1edf b\u1ea3n v\u1ebd m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng, ki\u1ec3m th\u1eed v\u00e0 m\u1edf r\u1ed9ng. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi tr\u00e1ch nhi\u1ec7m b\u00ean trong c\u01a1 s\u1edf m\u00e3 ngu\u1ed3n.<\/p>\n

                T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn t\u00ednh \u0111\u00f3ng g\u00f3i<\/h3>\n

                Vi\u1ec7c \u0111\u00f3ng g\u00f3i d\u1ef1a tr\u00ean vi\u1ec7c che gi\u1ea5u d\u1eef li\u1ec7u v\u00e0 c\u00f4ng khai h\u00e0nh vi. N\u1ebfu s\u01a1 \u0111\u1ed3 hi\u1ec3n th\u1ecb m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c thay v\u00ec m\u1ed9t thu\u1ed9c t\u00ednh, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 ti\u1ebft l\u1ed9 tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 qu\u00e1 s\u1edbm. N\u1ebfu m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a nh\u01b0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 vi\u1ebft m\u00e3 x\u1eed l\u00fd d\u1eef li\u1ec7u nh\u01b0 logic, d\u1eabn \u0111\u1ebfn c\u00e1c m\u1eabu truy c\u1eadp k\u00e9m hi\u1ec7u qu\u1ea3.<\/p>\n

                  \n
                • B\u1ea3o m\u1eadt:<\/strong>S\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m kh\u00f4ng b\u1ecb ti\u1ebft l\u1ed9 v\u00f4 t\u00ecnh th\u00f4ng qua logic \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho t\u00ednh to\u00e1n.<\/li>\n
                • Hi\u1ec7u su\u1ea5t:<\/strong>Xem truy c\u1eadp d\u1eef li\u1ec7u nh\u01b0 c\u00e1c l\u1eddi g\u1ecdi ph\u01b0\u01a1ng th\u1ee9c c\u00f3 th\u1ec3 t\u1ea1o ra chi ph\u00ed kh\u00f4ng c\u1ea7n thi\u1ebft n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/li>\n<\/ul>\n

                  T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn \u00e1nh x\u1ea1 c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h3>\n

                  Trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7, c\u00e1c thu\u1ed9c t\u00ednh \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp sang c\u00e1c c\u1ed9t. C\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u00e1nh x\u1ea1 sang c\u00e1c th\u1ee7 t\u1ee5c l\u01b0u tr\u1eef ho\u1eb7c logic \u1ee9ng d\u1ee5ng. N\u1ebfu m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u00e1nh d\u1ea5u m\u1ed9t ph\u00e9p t\u00ednh l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh, nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 c\u1ed1 g\u1eafng l\u01b0u k\u1ebft qu\u1ea3 v\u00e0o m\u1ed9t c\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u thay v\u00ec t\u00ednh to\u00e1n ngay l\u1eadp t\u1ee9c. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 d\u01b0 th\u1eeba d\u1eef li\u1ec7u v\u00e0 b\u1ea5t nh\u1ea5t d\u1eef li\u1ec7u.<\/p>\n

                  T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn thi\u1ebft k\u1ebf API<\/h3>\n

                  Khi thi\u1ebft k\u1ebf API, c\u00e1c \u0111i\u1ec3m cu\u1ed1i th\u01b0\u1eddng t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c. C\u00e1c t\u00e0i nguy\u00ean t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh. Nh\u1ea7m l\u1eabn hai kh\u00e1i ni\u1ec7m n\u00e0y d\u1eabn \u0111\u1ebfn vi ph\u1ea1m RESTful. Y\u00eau c\u1ea7u GET n\u00ean truy xu\u1ea5t c\u00e1c thu\u1ed9c t\u00ednh. Y\u00eau c\u1ea7u POST n\u00ean g\u1ecdi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ec3 t\u1ea1o ho\u1eb7c c\u1eadp nh\u1eadt tr\u1ea1ng th\u00e1i. C\u00e1c s\u01a1 \u0111\u1ed3 ch\u00ednh x\u00e1c s\u1ebd \u0111\u1ecbnh h\u01b0\u1edbng h\u1ee3p \u0111\u1ed3ng API.<\/p>\n

                  C\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf v\u00e0 v\u00ed d\u1ee5 \ud83d\udee0\ufe0f<\/h2>\n

                  \u0110\u1ec3 c\u1ee7ng c\u1ed1 hi\u1ec3u bi\u1ebft, h\u00e3y c\u00f9ng xem x\u00e9t c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 n\u01a1i s\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/p>\n

                  T\u00ecnh hu\u1ed1ng 1: Gi\u1ecf h\u00e0ng<\/h3>\n

                  H\u00e3y xem x\u00e9t m\u1ed9t ShoppingCart<\/code>l\u1edbp.<\/p>\n

                    \n
                  • Thu\u1ed9c t\u00ednh:<\/strong> items: List<Item><\/code>, totalAmount: decimal<\/code>, discountCode: string<\/code>.<\/li>\n
                  • Ph\u01b0\u01a1ng th\u1ee9c:<\/strong> addItem()<\/code>, removeItem()<\/code>, applyDiscount()<\/code>, checkout()<\/code>.<\/li>\n<\/ul>\n

                    L\u01b0u \u00fd r\u1eb1ng totalAmount<\/code> l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh v\u00ec n\u00f3 l\u01b0u tr\u1eef t\u1ed5ng hi\u1ec7n t\u1ea1i. Tuy nhi\u00ean, vi\u1ec7c t\u00ednh to\u00e1n t\u1ed5ng n\u00e0y l\u00e0 nhi\u1ec7m v\u1ee5 c\u1ee7a t\u00ednhT\u1ed5ng()<\/code>. N\u1ebfu b\u1ea1n v\u1ebd t\u00ednhT\u1ed5ng()<\/code> nh\u01b0 m\u1ed9t thu\u1ed9c t\u00ednh, \u0111i\u1ec1u \u0111\u00f3 ng\u1ee5 \u00fd r\u1eb1ng gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef t\u0129nh, \u0111i\u1ec1u n\u00e0y l\u00e0 sai. Gi\u00e1 tr\u1ecb thay \u0111\u1ed5i khi c\u00e1c m\u1ee5c thay \u0111\u1ed5i.<\/p>\n

                    T\u00ecnh hu\u1ed1ng 2: H\u1ec7 th\u1ed1ng X\u00e1c th\u1ef1c Ng\u01b0\u1eddi d\u00f9ng<\/h3>\n

                    Xem x\u00e9t m\u1ed9t AuthenticationSession<\/code> l\u1edbp.<\/p>\n

                      \n
                    • Thu\u1ed9c t\u00ednh:<\/strong> token: chu\u1ed7i<\/code>, expiresAt: th\u1eddi \u0111i\u1ec3m<\/code>, userId: s\u1ed1 nguy\u00ean<\/code>.<\/li>\n
                    • Ph\u01b0\u01a1ng th\u1ee9c:<\/strong> h\u1ee3p l\u1ec7()<\/code>, l\u00e0m m\u1edbi()<\/code>, h\u1ee7y()<\/code>.<\/li>\n<\/ul>\n

                      Ph\u01b0\u01a1ng th\u1ee9c h\u1ee3p l\u1ec7()<\/code> ki\u1ec3m tra thu\u1ed9c t\u00ednh expiresAt<\/code> thu\u1ed9c t\u00ednh. N\u00f3 kh\u00f4ng l\u01b0u tr\u1eef m\u1ed9t gi\u00e1 tr\u1ecb ki\u1ec3u boolean v\u1ec1 t\u00ednh h\u1ee3p l\u1ec7. N\u1ebfu h\u1ee3p l\u1ec7<\/code> l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh, h\u1ec7 th\u1ed1ng s\u1ebd c\u1ea7n c\u1eadp nh\u1eadt thu\u1ed9c t\u00ednh \u0111\u00f3 m\u1ed7i khi \u0111\u1ed3ng h\u1ed3 thay \u0111\u1ed5i, \u0111i\u1ec1u n\u00e0y kh\u00f4ng hi\u1ec7u qu\u1ea3 v\u00e0 d\u1ec5 x\u1ea3y ra xung \u0111\u1ed9t c\u1ea1nh tranh. N\u00f3 ho\u00e0n to\u00e0n l\u00e0 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c.<\/p>\n

                      Chi\u1ebfn l\u01b0\u1ee3c X\u00e1c minh cho C\u00e1c S\u01a1 \u0111\u1ed3 C\u1ee7a B\u1ea1n \u2705<\/h2>\n

                      L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 b\u1ea1n \u0111\u1ea3m b\u1ea3o c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a m\u00ecnh lu\u00f4n ch\u00ednh x\u00e1c theo th\u1eddi gian? Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, y\u00eau c\u1ea7u thay \u0111\u1ed5i, c\u00e1c s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 l\u1ec7ch l\u1ea1c. C\u1ea7n ph\u1ea3i ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3.<\/p>\n

                      Ki\u1ec3m tra xem x\u00e9t m\u00e3 ngu\u1ed3n<\/h3>\n

                      Khi xem x\u00e9t m\u00e3 ngu\u1ed3n, h\u00e3y ki\u1ec3m tra ph\u1ea7n tri\u1ec3n khai so v\u1edbi s\u01a1 \u0111\u1ed3. M\u00e3 ngu\u1ed3n c\u00f3 thu\u1ed9c t\u00ednh \u1edf v\u1ecb tr\u00ed s\u01a1 \u0111\u1ed3 l\u1ea1i c\u00f3 ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng? S\u01a1 \u0111\u1ed3 c\u00f3 hi\u1ec3n th\u1ecb m\u1ed9t ph\u00e9p t\u00ednh \u0111\u01b0\u1ee3c tri\u1ec3n khai d\u01b0\u1edbi d\u1ea1ng gi\u00e1 tr\u1ecb l\u01b0u tr\u1eef kh\u00f4ng? N\u1ebfu m\u00e3 ngu\u1ed3n v\u00e0 s\u01a1 \u0111\u1ed3 kh\u00e1c nhau, h\u00e3y c\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3. S\u01a1 \u0111\u1ed3 ph\u1ea3i ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf c\u1ee7a m\u00e3 ngu\u1ed3n.<\/p>\n

                      C\u00f4ng c\u1ee5 ph\u00e2n t\u00edch t\u0129nh<\/h3>\n

                      Nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng ph\u00e1t tri\u1ec3n cung c\u1ea5p c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c m\u00e3 ngu\u1ed3n th\u00e0nh s\u01a1 \u0111\u1ed3 l\u1edbp. S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 n\u00e0y c\u00f3 th\u1ec3 l\u00e0m n\u1ed5i b\u1eadt s\u1ef1 kh\u00e1c bi\u1ec7t. N\u1ebfu c\u00f4ng c\u1ee5 hi\u1ec3n th\u1ecb m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u1edf v\u1ecb tr\u00ed b\u1ea1n v\u1ebd thu\u1ed9c t\u00ednh, h\u00e3y \u0111i\u1ec1u tra l\u00fd do t\u1ea1i sao. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng cho th\u1ea5y thu\u1ed9c t\u00ednh \u0111\u00f3 n\u00ean \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 ri\u00eang t\u01b0 ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c l\u00e0 th\u1eeba.<\/p>\n

                      \u0110\u00e1nh gi\u00e1 \u0111\u1ed3ng nghi\u1ec7p<\/h3>\n

                      H\u00e3y \u0111\u1ec3 \u0111\u1ed3ng nghi\u1ec7p xem x\u00e9t s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n. H\u00e3y h\u1ecfi h\u1ecd c\u1ee5 th\u1ec3: \u201c\u0110i\u1ec1u n\u00e0y c\u00f3 v\u1ebb nh\u01b0 d\u1eef li\u1ec7u hay logic kh\u00f4ng?\u201d N\u1ebfu h\u1ecd do d\u1ef1, c\u00f3 s\u1ef1 m\u01a1 h\u1ed3. S\u1ef1 m\u01a1 h\u1ed3 l\u00e0 k\u1ebb th\u00f9 c\u1ee7a thi\u1ebft k\u1ebf ch\u00ednh x\u00e1c. \u0110\u01a1n gi\u1ea3n h\u00f3a k\u00fd hi\u1ec7u \u0111\u1ec3 lo\u1ea1i b\u1ecf s\u1ef1 nghi ng\u1edd.<\/p>\n

                      T\u00f3m t\u1eaft so s\u00e1nh \ud83d\udccb<\/h2>\n

                      \u0110\u1ec3 l\u00e0m r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t h\u01a1n n\u1eefa, h\u00e3y tham kh\u1ea3o b\u1ea3ng so s\u00e1nh n\u00e0y. N\u00f3 t\u00f3m t\u1eaft nh\u1eefng kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c trong b\u1ed1i c\u1ea3nh m\u00f4 h\u00ecnh h\u00f3a l\u1edbp.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
                      T\u00ednh n\u0103ng<\/strong><\/th>\nThu\u1ed9c t\u00ednh<\/strong><\/th>\nPh\u01b0\u01a1ng th\u1ee9c<\/strong><\/th>\n<\/tr>\n<\/thead>\n
                      \u0110\u1ecbnh ngh\u0129a<\/strong><\/td>\nD\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ed1i t\u01b0\u1ee3ng l\u01b0u tr\u1eef<\/td>\nC\u00e1c h\u00e0nh \u0111\u1ed9ng th\u1ef1c hi\u1ec7n b\u1edfi \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\n<\/tr>\n
                      C\u00e2u h\u1ecfi \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi<\/strong><\/td>\nN\u00f3 c\u00f3 g\u00ec?<\/td>\nN\u00f3 l\u00e0m g\u00ec?<\/td>\n<\/tr>\n
                      B\u1ed9 nh\u1edb<\/strong><\/td>\nPh\u00e2n b\u1ed5 cho t\u1eebng th\u1ec3 hi\u1ec7n<\/td>\nPh\u00e2n b\u1ed5 trong \u0111o\u1ea1n m\u00e3<\/td>\n<\/tr>\n
                      K\u00fd hi\u1ec7u UML<\/strong><\/td>\nT\u00ean : Ki\u1ec3u<\/td>\nT\u00ean(Tham s\u1ed1) : Ki\u1ec3uTr\u1ea3V\u1ec1<\/td>\n<\/tr>\n
                      Th\u1ef1c thi<\/strong><\/td>\nB\u1ecb \u0111\u1ed9ng (Kh\u00f4ng th\u1ef1c thi)<\/td>\nCh\u1ee7 \u0111\u1ed9ng (Th\u1ef1c thi logic)<\/td>\n<\/tr>\n
                      \u00c1nh x\u1ea1 c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/strong><\/td>\nC\u00e1c c\u1ed9t<\/td>\nTh\u1ee7 t\u1ee5c \/ Logic<\/td>\n<\/tr>\n
                      V\u00ed d\u1ee5<\/strong><\/td>\ngi\u00e1: float<\/code><\/td>\nt\u00ednhThu\u1ebf(): float<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      C\u00e1c Th\u1ef1c H\u00e0nh T\u1ed1t Nh\u1ea5t \u0110\u1ec3 \u0110\u1ea3m B\u1ea3o R\u00f5 R\u00e0ng \ud83e\udded<\/h2>\n

                      \u0110\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt. Tu\u00e2n theo c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t n\u00e0y \u0111\u1ec3 duy tr\u00ec ti\u00eau chu\u1ea9n cao trong t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n.<\/p>\n

                        \n
                      • T\u00ean G\u1ecdi Nh\u1ea5t Qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng danh t\u1eeb cho thu\u1ed9c t\u00ednh v\u00e0 \u0111\u1ed9ng t\u1eeb cho ph\u01b0\u01a1ng th\u1ee9c. t\u00eanNg\u01b0\u1eddiD\u00f9ng<\/code> so v\u1edbi thi\u1ebftL\u1eadpT\u00eanNg\u01b0\u1eddiD\u00f9ng<\/code>.<\/li>\n
                      • Ti\u1ebfp C\u1eadn T\u1ed1i Thi\u1ec3u:<\/strong> Gi\u1eef c\u00e1c thu\u1ed9c t\u00ednh \u1edf ch\u1ebf \u0111\u1ed9 ri\u00eang t\u01b0 tr\u1eeb khi c\u1ea7n thi\u1ebft. Ch\u1ec9 c\u00f4ng khai ch\u00fang th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c.<\/li>\n
                      • Tr\u00e1ch Nhi\u1ec7m \u0110\u01a1n Nh\u1ea5t:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c th\u1ef1c hi\u1ec7n m\u1ed9t nhi\u1ec7m v\u1ee5 logic duy nh\u1ea5t. N\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c l\u00e0m qu\u00e1 nhi\u1ec1u vi\u1ec7c, c\u00f3 th\u1ec3 s\u1ebd t\u1ed1t h\u01a1n n\u1ebfu chia nh\u1ecf, \u0111i\u1ec1u n\u00e0y gi\u00fap l\u00e0m r\u00f5 s\u01a1 \u0111\u1ed3.<\/li>\n
                      • T\u00e0i Li\u1ec7u:<\/strong> Th\u00eam ch\u00fa th\u00edch cho c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ph\u1ee9c t\u1ea1p. C\u00e1c thu\u1ed9c t\u00ednh th\u01b0\u1eddng c\u1ea7n \u00edt gi\u1ea3i th\u00edch h\u01a1n, nh\u01b0ng c\u00e1c r\u00e0ng bu\u1ed9c (nh\u01b0 gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u\/t\u1ed1i \u0111a) n\u00ean \u0111\u01b0\u1ee3c ghi ch\u00fa l\u1ea1i.<\/li>\n
                      • Ki\u1ec3m So\u00e1t Phi\u00ean B\u1ea3n:<\/strong> Xem s\u01a1 \u0111\u1ed3 nh\u01b0 m\u00e3 ngu\u1ed3n. G\u1eedi thay \u0111\u1ed5i v\u00e0o s\u01a1 \u0111\u1ed3 khi m\u00e3 ngu\u1ed3n thay \u0111\u1ed5i.<\/li>\n<\/ul>\n

                        Nh\u1eefng B\u00e0i H\u1ecdc Cu\u1ed1i C\u00f9ng \ud83c\udfaf<\/h2>\n

                        S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t quy t\u1eafc ng\u1eef ph\u00e1p; \u0111\u00f3 l\u00e0 m\u1ed9t ranh gi\u1edbi kh\u00e1i ni\u1ec7m \u0111\u1ecbnh ngh\u0129a c\u00e1ch ph\u1ea7n m\u1ec1m ho\u1ea1t \u0111\u1ed9ng. Vi\u1ec7c nh\u1ea7m l\u1eabn ch\u00fang d\u1eabn \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f3 hi\u1ec3u, kh\u00f3 ki\u1ec3m th\u1eed v\u00e0 kh\u00f3 m\u1edf r\u1ed9ng. B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n tr\u1ef1c quan c\u1ee7a UML v\u00e0 duy tr\u00ec m\u00f4 h\u00ecnh t\u01b0 duy r\u00f5 r\u00e0ng v\u1ec1 tr\u1ea1ng th\u00e1i so v\u1edbi h\u00e0nh vi, b\u1ea1n t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ee5c v\u1ee5 \u0111\u00fang m\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang: giao ti\u1ebfp.<\/p>\n

                        C\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp ch\u00ednh x\u00e1c gi\u1ea3m b\u1edbt s\u1ef1 c\u1ea3n tr\u1edf gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai. Ch\u00fang cho ph\u00e9p c\u00e1c \u0111\u1ed9i l\u00e0m vi\u1ec7c song song v\u1edbi s\u1ef1 t\u1ef1 tin, bi\u1ebft r\u1eb1ng b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf kh\u1edbp v\u1edbi th\u1ef1c t\u1ebf x\u00e2y d\u1ef1ng. Khi b\u1ea1n v\u1ebd m\u1ed9t l\u1edbp, h\u00e3y d\u1eebng l\u1ea1i v\u00e0 t\u1ef1 h\u1ecfi: \u201c\u0110\u00e2y l\u00e0 d\u1eef li\u1ec7u hay l\u00e0 logic?\u201d Vi\u1ec7c tr\u1ea3 l\u1eddi \u0111\u00fang c\u00e2u h\u1ecfi n\u00e0y l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean h\u01b0\u1edbng t\u1edbi ki\u1ebfn tr\u00fac v\u1eefng ch\u1eafc.<\/p>\n

                        Ti\u1ebfp t\u1ee5c ho\u00e0n thi\u1ec7n k\u1ef9 n\u0103ng m\u00f4 h\u00ecnh h\u00f3a c\u1ee7a b\u1ea1n. T\u00ecm ki\u1ebfm ph\u1ea3n h\u1ed3i v\u1ec1 c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n. Xem ch\u00fang nh\u01b0 t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng c\u1ea7n \u0111\u01b0\u1ee3c ch\u0103m s\u00f3c nh\u01b0 ch\u00ednh m\u00e3 ngu\u1ed3n m\u00e0 ch\u00fang \u0111\u1ea1i di\u1ec7n. B\u1eb1ng c\u00e1ch l\u00e0m nh\u01b0 v\u1eady, b\u1ea1n g\u00f3p ph\u1ea7n x\u00e2y d\u1ef1ng m\u1ed9t v\u0103n h\u00f3a v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng, mang l\u1ea1i l\u1ee3i \u00edch cho to\u00e0n b\u1ed9 t\u1ed5 ch\u1ee9c k\u1ef9 thu\u1eadt.<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Trong b\u1ed1i c\u1ea3nh ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t s\u1edf th\u00edch th\u1ea9m m\u1ef9; n\u00f3 l\u00e0 n\u1ec1n t\u1ea3ng cho kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec. M\u1ed9t trong nh\u1eefng…<\/p>\n","protected":false},"author":1,"featured_media":1131,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Thu\u1ed9c T\u00ednh So V\u1edbi Ph\u01b0\u01a1ng Th\u1ee9c Trong S\u01a1 \u0110\u1ed3 L\u1edbp UML: H\u01b0\u1edbng D\u1eabn R\u00f5 R\u00e0ng \ud83d\udcca","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch ph\u00e2n bi\u1ec7t gi\u1eefa thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c trong s\u01a1 \u0111\u1ed3 l\u1edbp. 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