A technique for developing a program in which the solution is expressed in terms of objects -- self- contained entities composed of data and operations on that data. Programmer thinks about and defines the attributes and behavior of objects. Often the objects are modeled after real-world entities. Very different approach than function-based programming (like C). | Overview of Object-Oriented Software Design and Java Programming Putting the Pieces Together! Object-Oriented Design A technique for developing a program in which the solution is expressed in terms of objects -- self- contained entities composed of data and operations on that data. Object Oriented Programming Programmer thinks about and defines the attributes and behavior of objects. Often the objects are modeled after real-world entities. Very different approach than function-based programming (like C). Reasons for OOP Abstraction Polymorphism Inheritance Encapsulation Software Engineering Issues Objects to Classes A class defines the pattern used when instantiating an object of that type. A class generally contains private data and public operations (called methods). Class: Object Types A Java class is an object type. When you create the definition of a class you are defining the attributes and behavior of a new type. Attributes are data members. Behavior is . | Overview of Object-Oriented Software Design and Java Programming Putting the Pieces Together! Object-Oriented Design A technique for developing a program in which the solution is expressed in terms of objects -- self- contained entities composed of data and operations on that data. Object Oriented Programming Programmer thinks about and defines the attributes and behavior of objects. Often the objects are modeled after real-world entities. Very different approach than function-based programming (like C). Reasons for OOP Abstraction Polymorphism Inheritance Encapsulation Software Engineering Issues Objects to Classes A class defines the pattern used when instantiating an object of that type. A class generally contains private data and public operations (called methods). Class: Object Types A Java class is an object type. When you create the definition of a class you are defining the attributes and behavior of a new type. Attributes are data members. Behavior is defined by methods. Creating an object Defining a class does not result in creation of an object. Declaring a variable of a class type creates an object. You can have many variables of the same type (class). Instantiation Superclass and Subclass Inheritance enables us to define a new class (called a subclass) that inherits the properties of an already existing class. The newly derived class is then specialized by adding properties specific to it. The class being inherited from is the superclass. The class that inherits properties is the subclass. Defining Objects An object-oriented program consists of many objects. An object is composed of identity, state (attributes, data, and their current values) and behavior (operations) . Identity, State, Behavior Identity is the property of an object that distinguishes it from all other objects. The failure to recognize the difference between the name of the object and the object itself is the source of many errors in object-oriented .
