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Object Oriented Programming - Lesson 3: Class Building

Object Oriented Programming - Lesson 3: Class Building Understand the application of object oriented principles in Java, Acquaint how to declare a class and its members, Data abstraction, Class building. | LESSON III Class Building Trinh Thanh TRUNG (MSc) trungtt@soict.hust.edu.vn 094.666.8608 1 Objectives • Understand the application of object oriented principles in Java • Acquaint how to declare a class and its members 2 Content • Data abstraction – – – – Overview Class and instance Message passing Visibility • Class building – Declaration • Class declaration • Class member declaration – Data hiding 3 Abstraction • "Abstraction – a concept or idea not associated with any specific instance" – E.g. Mathematics definitions • Two types of abstraction – Control abstraction • Using subprogram and control flow • E.g. a:=(1+2)*5 – Data abstraction • E.g. data type 4 Abstraction • Abstraction hides the detailled information about object. • Abstraction is a view or representation of an object that includes only the most significant attributes – These attributes make dicstinction this object with .