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The need of future Prof.
Sub typing is looking at things from Top to bottom whereas in generalization we look at things from bottom to top Specialization Restriction We want to add a class to existing hierarchy of classes having many similarities to already existing classes but some part of its behaviour is different or restricted.
It includes use cases, which are pieces of functionality the system More information. Entities, attributes, More information. It is a reference by which one object can interact with some other object. Hakimzadeh, 1 Outline Overview. In the context of programming models are used to understand the problem handoutts starting developing it. Example 1 Multiple Inheritance Consider the example of an imaginary specie Mermaid used in fairy tales that lives in water having features both of a women as well as of a fish, In Object Oriented programming perspective Mermaid can be derived from two classes Women and Fish.
Last time Dynamic compilation Today Introduction to compiling object oriented languages What are the issues? Automated Virtual Cloud Management: Java History CS In generalization there should be Is a Kind of Relationship also called Is A relationship between base and child classes.
Private information should only be accessible to its owner. Inheritance is considered class association. The number and kind of messages that can be sent to an object depends upon its interface Examples Messages A Person sends message stimulus stop jandouts a Car by applying brakes A Person sends message place call to a Phone by pressing appropriate button Summary Information hiding is achieved through encapsulation. Object-Oriented Programming Object-Oriented Programming Programming with Data Types to enhance reliability and productivity through reuse and by facilitating handots Object instance State fields Behavior methods Identity More information.
Citation s listed may represent More information. What is the most important feature of Java? So we can say that in our daily life everything can be taken as an object that behaves in a certain way and has certain attributes.
Overriding is used for Specialization, Extention, Restriction, and Performance Multiple Inheritance Sometimes we want to reuse characteristics of more than one parent class, in that case we need to inherit a class from more than one classes.
We make Object Oriented models showing several interacting objects to understand a system given to us for implementation. As we saw earlier that our object oriented model only had objects handoits their interactions hiding implementation details so it makes it easier for everyone to understand our object oriented model.
How do we know when we re finished each step? PBC – Course Name: Virtual University of Pakistan 1.
Examples of Implementation a. This course is an introduction to objectoriented programming using the Java language.
Object Oriented Programming (CS304)
We need models to understand an aspect of reality. CopyrightBill Trudell.
An server may have account information of millions of people but it will share only our account information with us if we request it to send anyone else accounts information our request will be refused.
Virtual University Of Pakistan: CS Handouts
Start display at page:. Base class is general class representing common behaviour of all derived classes. Problems with Multiple Inheritance Increased complexity Amphibious vehicle hierarchy is a complicated as this class is derived from two classes that will make code more complex and less understandable however this is obvious hqndouts amphibious vehicle is a complicated vehicle.
Override eat method in Mermaid class b. But, in practice, there is. A continuum of courses, including advanced classes in technology is needed. Object-Oriented Programming Programming with Data Types to enhance reliability and productivity through reuse and handoutz facilitating evolution Object instance State fields Behavior methods Identity. In this case the derived class objects will also contain base class objects attributes and methods. Object Oriented Design Kenneth M.
It has two parts, Internal data structures to hold an object state that will be hidden from us it will store values for an object data members.
Complete the exercise in class design. The presentation layer may represent encode the data in various ways e. Technology and Society Interaction Standard 2: