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Real world concepts can be modeled in a computer program The program is made of objects with certain properties and operations that the objects can perform It is not important how an object is implemented, but what it does Every object is responsible for carrying out a set of related tasks. A class can contain data declarations and method declarations | Chapter 3. OOP Basic ITSS Java Programming CAO Tuan-Dung, HUT Object - Oriented Real world concepts can be modeled in a computer program The program is made of objects with certain properties and operations that the objects can perform It is not important how an object is implemented, but what it does Every object is responsible for carrying out a set of related tasks HTTP request: HTTP method : Requesting method for Web servers such as GET method and POST method Request URI : URL information on Web server ‘form’ data : Information input by browser HTTP response: • Response message Status information which is the processing result of HTTP method • Contents type Contents type information on data to be transmitted • Request file Main information such as HTML files to be transmitted to HTTP request Object Oriented Real world Attribute Operation Account name: Duc Binh Balance: 2.000.000 VND Deposit Debit Balance inquiry Operation request Balance inquiry I want to inquiry . | Chapter 3. OOP Basic ITSS Java Programming CAO Tuan-Dung, HUT Object - Oriented Real world concepts can be modeled in a computer program The program is made of objects with certain properties and operations that the objects can perform It is not important how an object is implemented, but what it does Every object is responsible for carrying out a set of related tasks HTTP request: HTTP method : Requesting method for Web servers such as GET method and POST method Request URI : URL information on Web server ‘form’ data : Information input by browser HTTP response: • Response message Status information which is the processing result of HTTP method • Contents type Contents type information on data to be transmitted • Request file Main information such as HTML files to be transmitted to HTTP request Object Oriented Real world Attribute Operation Account name: Duc Binh Balance: 2.000.000 VND Deposit Debit Balance inquiry Operation request Balance inquiry I want to inquiry the balance Computer world Attribute name: Duc Binh Balance: 2.000.000 VND Deposit() Withdraw() checkBalance() operation operation Account object User object Message transmission checkBalance() Class and Object A group of objects with similar properties and behaviors is described by a class. Class is a blueprint for an object. A class contains fields and methods that define the behavior of the object. A class is a description of a kind of object. Class and Objects Attribute name: Duc Binh Balance: 2.000.000 VND Deposit() Withdraw() checkBalance() operation Account object of Mr Duc Binh Attribute name: Thu Lan Balance: 1.000.000 VND Deposit() Withdraw() checkBalance() operation Account object of Mrs Thu Lan Account Class (model of objects) Attribute Definition of member variable String name; long balance; void deposit(int money); void withdraw() int checkBalance() Method definition operation INSTANTIATE Classes A class can contain data declarations and method declarations int
