{"id":25,"date":"2025-07-22T02:52:44","date_gmt":"2025-07-22T02:52:44","guid":{"rendered":"https:\/\/kienthucmo.com\/?p=25"},"modified":"2025-12-07T15:15:47","modified_gmt":"2025-12-07T08:15:47","slug":"lap-trinh-huong-doi-tuong-oop-tu-duy-cot-loi-trong-phat-trien-phan-mem-hien-dai","status":"publish","type":"post","link":"https:\/\/kienthucmo.com\/vi\/lap-trinh-huong-doi-tuong-oop-tu-duy-cot-loi-trong-phat-trien-phan-mem-hien-dai\/","title":{"rendered":"L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP): T\u01b0 duy c\u1ed1t l\u00f5i trong ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i"},"content":{"rendered":"\n

L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p l\u1eadp tr\u00ecnh \u0111\u00e3 tr\u1edf n\u00ean quen thu\u1ed9c v\u1edbi nhi\u1ec1u l\u1eadp tr\u00ecnh vi\u00ean. Tuy nhi\u00ean, OOP kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u201clung linh\u201d nh\u01b0 nh\u1eefng g\u00ec ch\u00fang ta th\u01b0\u1eddng th\u1ea5y trong s\u00e1ch gi\u00e1o khoa hay b\u00e0i gi\u1ea3ng. Tr\u00ean th\u1ef1c t\u1ebf, khi \u00e1p d\u1ee5ng v\u00e0o d\u1ef1 \u00e1n th\u1eadt, OOP c\u00f3 th\u1ec3 kh\u00e1 th\u00e1ch th\u1ee9c v\u00e0 kh\u00f4ng ho\u00e0n to\u00e0n d\u1ec5 d\u00e0ng.<\/p>\n\n\n\n

D\u1eabu v\u1eady, vi\u1ec7c hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n c\u1ee7a OOP v\u1eabn l\u00e0 b\u01b0\u1edbc n\u1ec1n t\u1ea3ng quan tr\u1ecdng gi\u00fap b\u1ea1n vi\u1ebft code r\u00f5 r\u00e0ng, d\u1ec5 qu\u1ea3n l\u00fd v\u00e0 ph\u00e1t tri\u1ec3n h\u01a1n v\u1ec1 l\u00e2u d\u00e0i. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd c\u00f9ng nhau t\u00ecm hi\u1ec3u nh\u1eefng \u0111i\u1ec1u c\u1ed1t l\u00f5i nh\u1ea5t c\u1ee7a l\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n\n\n\n

1. L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP) l\u00e0 g\u00ec? L\u1ecbch s\u1eed h\u00ecnh th\u00e0nh v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a OOP<\/h2>\n\n\n\n
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L\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (Object-Oriented Programming – OOP)<\/a><\/strong> l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p l\u1eadp tr\u00ecnh d\u1ef1a tr\u00ean kh\u00e1i ni\u1ec7m \u201c\u0111\u1ed1i t\u01b0\u1ee3ng\u201d \u2013 nh\u1eefng th\u1ef1c th\u1ec3 \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong th\u1ebf gi\u1edbi th\u1ef1c ho\u1eb7c c\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng. M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 ch\u1ee9a d\u1eef li\u1ec7u (g\u1ecdi l\u00e0 thu\u1ed9c t\u00ednh) v\u00e0 c\u00e1c h\u00e0nh vi (g\u1ecdi l\u00e0 ph\u01b0\u01a1ng th\u1ee9c). M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a OOP l\u00e0 gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean m\u00f4 h\u00ecnh h\u00f3a c\u00e1c v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p th\u00e0nh c\u00e1c th\u00e0nh ph\u1ea7n nh\u1ecf, \u0111\u1ed9c l\u1eadp nh\u01b0ng c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau th\u00f4ng qua c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, t\u1eeb \u0111\u00f3 l\u00e0m cho m\u00e3 ngu\u1ed3n d\u1ec5 hi\u1ec3u, d\u1ec5 qu\u1ea3n l\u00fd v\u00e0 t\u00e1i s\u1eed d\u1ee5ng h\u01a1n.<\/p>\n\n\n\n

L\u1ecbch s\u1eed ph\u00e1t tri\u1ec3n c\u1ee7a OOP b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng n\u0103m 1960 v\u1edbi ng\u00f4n ng\u1eef Simula, \u0111\u01b0\u1ee3c coi l\u00e0 ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea7u ti\u00ean. \u00dd t\u01b0\u1edfng n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c ho\u00e0n thi\u1ec7n v\u00e0 ph\u1ed5 bi\u1ebfn r\u1ed9ng r\u00e3i h\u01a1n qua c\u00e1c ng\u00f4n ng\u1eef nh\u01b0 Smalltalk v\u00e0o nh\u1eefng n\u0103m 1970 v\u00e0 \u0111\u1eb7c bi\u1ec7t l\u00e0 C++ t\u1eeb th\u1eadp ni\u00ean 1980. T\u1eeb \u0111\u00f3, OOP tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ch\u1ee7 \u0111\u1ea1o trong l\u1eadp tr\u00ecnh ph\u1ea7n m\u1ec1m, \u0111\u1eb7c bi\u1ec7t l\u00e0 v\u1edbi s\u1ef1 b\u00f9ng n\u1ed5 c\u1ee7a c\u00e1c ng\u00f4n ng\u1eef nh\u01b0 Java, C#, Python\u2026 h\u1ed7 tr\u1ee3 m\u1ea1nh m\u1ebd cho m\u00f4 h\u00ecnh n\u00e0y.<\/p>\n\n\n\n

So v\u1edbi l\u1eadp tr\u00ecnh th\u1ee7 t\u1ee5c (Procedural Programming), OOP c\u00f3 nhi\u1ec1u \u0111i\u1ec3m kh\u00e1c bi\u1ec7t c\u0103n b\u1ea3n. L\u1eadp tr\u00ecnh th\u1ee7 t\u1ee5c t\u1eadp trung v\u00e0o vi\u1ec7c vi\u1ebft c\u00e1c h\u00e0m v\u00e0 c\u00e1c b\u01b0\u1edbc x\u1eed l\u00fd d\u1eef li\u1ec7u tu\u1ea7n t\u1ef1, trong khi OOP t\u1eadp trung v\u00e0o vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ee9a c\u1ea3 d\u1eef li\u1ec7u v\u00e0 h\u00e0nh vi li\u00ean quan. \u0110i\u1ec1u n\u00e0y gi\u00fap OOP th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p trong th\u1ef1c t\u1ebf m\u1ed9t c\u00e1ch tr\u1ef1c quan h\u01a1n v\u00e0 t\u0103ng kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng m\u00e3 ngu\u1ed3n. \u0110\u1ed3ng th\u1eddi, OOP c\u0169ng h\u1ed7 tr\u1ee3 t\u1ed1t h\u01a1n cho vi\u1ec7c b\u1ea3o tr\u00ec v\u00e0 m\u1edf r\u1ed9ng ph\u1ea7n m\u1ec1m khi d\u1ef1 \u00e1n ph\u00e1t tri\u1ec3n l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p.<\/p>\n\n\n\n

2. C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh trong l\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng (OOP)<\/h2>\n\n\n\n
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2.1 L\u1edbp (Class)<\/h3>\n\n\n\n

Kh\u00e1i ni\u1ec7m l\u1edbp (Class)<\/strong> l\u00e0 g\u00ec?<\/strong>
L\u1edbp (Class) l\u00e0 khu\u00f4n m\u1eabu, b\u1ea3n thi\u1ebft k\u1ebf ho\u1eb7c b\u1ea3n v\u1ebd \u0111\u1ec3 t\u1ea1o ra c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (Object). N\u00f3 \u0111\u1ecbnh ngh\u0129a c\u1ea5u tr\u00fac v\u00e0 h\u00e0nh vi chung cho m\u1ed9t nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f9ng lo\u1ea1i. M\u1ed9t l\u1edbp bao g\u1ed3m c\u00e1c thu\u1ed9c t\u00ednh (d\u1eef li\u1ec7u) v\u00e0 ph\u01b0\u01a1ng th\u1ee9c (h\u00e0nh vi) m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng thu\u1ed9c l\u1edbp \u0111\u00f3 s\u1ebd c\u00f3.<\/p>\n\n\n\n

Vai tr\u00f2 c\u1ee7a l\u1edbp (Class) trong OOP<\/strong>
L\u1edbp(Class)<\/strong> gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean \u0111\u00f3ng g\u00f3i d\u1eef li\u1ec7u v\u00e0 c\u00e1c ch\u1ee9c n\u0103ng li\u00ean quan th\u00e0nh m\u1ed9t \u0111\u01a1n v\u1ecb logic duy nh\u1ea5t. Nh\u1edd \u0111\u00f3, vi\u1ec7c qu\u1ea3n l\u00fd, b\u1ea3o tr\u00ec v\u00e0 m\u1edf r\u1ed9ng ch\u01b0\u01a1ng tr\u00ecnh tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n. Ngo\u00e0i ra, l\u1edbp c\u00f2n cho ph\u00e9p t\u1ea1o ra nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng ri\u00eang bi\u1ec7t m\u00e0 v\u1eabn d\u00f9ng chung c\u1ea5u tr\u00fac v\u00e0 h\u00e0nh vi, gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c.<\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/em>
H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n mu\u1ed1n l\u1eadp tr\u00ecnh m\u1ed9t h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd xe \u00f4 t\u00f4. L\u1edbp \u201cCar\u201d s\u1ebd l\u00e0 khu\u00f4n m\u1eabu chung \u0111\u1ecbnh ngh\u0129a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 m\u00e0u s\u1eafc, h\u00e3ng s\u1ea3n xu\u1ea5t, n\u0103m s\u1ea3n xu\u1ea5t, c\u00f9ng c\u00e1c ph\u01b0\u01a1ng th\u1ee9c nh\u01b0 kh\u1edfi \u0111\u1ed9ng, d\u1eebng xe, t\u0103ng t\u1ed1c.<\/p>\n\n\n\n

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