Java Object-Oriented Programming Conecpts(Real-Time) Examples
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The document discusses key concepts in object-oriented programming including objects, classes, abstraction, encapsulation, inheritance, and polymorphism. An object represents an instance of a class and contains data fields and methods. Classes define common properties and behaviors for groups of objects. Abstraction hides unnecessary details and shows only essential features to users. Encapsulation binds data and code into a single unit. Inheritance allows new classes to inherit features from existing classes. Polymorphism enables the same operation to behave differently depending on the context.
Java Object-Oriented Programming Conecpts(Real-Time) Examples
- 1. JAVA By Shridhar B
- 2. Object Object is the basic unit of any programming language.Objects are identified by its unique name. An object are identified by its unique name. An object represents a particular instance of a class. Each instance of an object can hold its relevant data. An object is a collection of data members and associated member functions.
- 3. Classes are data types based on which objects are created. Objects with similar properties and methods are grouped together to form a class. Class represent a set of individual objects Example 1: consider a class of cars under which Santro Xing, Alto andWagonR represents individual objects. In this context each car object will have its own model, year of manufacturer,Colour,Top Speed, Engine power etc.which from properties of the car class and the associates functions actions that is
- 4. Object functions like start,move,stop from the methods of the car class. No memory is allocated when the class is created. Memory is allocated when the object is created. Example 2 : An architect will have blue prints for a house…those blue prints will be plan that explain exactly the what properties the house will have and how they all are laid out. However it is just a blue print you cannot live in it. Builders will look at the blue prints and use those blueprints to make a physical house.
- 5. They can use the same blue print to make as many houses they want……each house will have the same layout and properties. Each house can accommodate their own families …so one house might have smiths live in it….and one house have the Jones live in it. The blue print is the class….the house is the object…the people living in the house are data stored in the object’s properties.
- 6. Abstraction: Abstraction means showing essential features and hiding non-essential features to the user Example: yahoo mail…… When you provide the username and password and click on the submit button…It will show the Compose,Inbox,Outbox,Sent mails…..so when u click on compose it will open…but the user does not what are the internal operations the internal actions…that is non-essential things. TV remote…..Remote is an interface between user and tv..right which has buttons 0 to 10..on/of etc.
- 7. But we donot know circuits inside the remote. Users does not need to know…just he is using essential things like remote
- 8. Encapsulation means which binds the data and code(or) writing operations and methods in a single unit. For example : A car is having a multiple parts …Like steering ,wheels and engine…which binds together to form a single object that is car…So here multiple parts of cars encapsulates itself together to form a single object that is car. Encapsulation = Abstraction + data Hiding
- 9. Inheritance: Deriving a new class from the existing class is called inheritance. Derived class is getting all the features from the existing class and also incorporating some new features to the existing class. Class Address { String name; String doorno; String streetname; }
- 10. Class latest address extends address{ String City; String State; String Country; }
- 11. Polymorphism: is the ability to take more than one form that an operation can exhibit different behavior at different instance depend upon the data passed in the operation. We behave differently in front of elders and friends. A single person is behaving differently at different time. A software engineer can perform different task at different instance of time depending on the task assigned to hime.He can do coding, testing, and analyzing ,designing depending on the task assign and the requirement.