OOPs : Object Oriented Programming
Object : Any real entity which is having some states/properties & behavior
States/Properties: > Variables (int, String, double)
------------------
BrandName
color
price
nipsize > Nouns
type
Behavior/Actions/verbs: > Methods/Functions
-----------------------
Writing
Caping/Uncaping
ChangingRefill
So if you combine states/properties & behavior into single unit then it will be called as
Class
Class is a blue print of a Object.
Static KeyWord: // ClassName.VariableName or ClassName.MethodName
1.It is used for Memory Management
2.It allows quick access to method or variable
// ClassName.VariableName
3.Easy to Change
-----------------------------------------------------------------------------------------
------------------------------------------------------------------------------------
OOP's Concepts:
1.Inheritance
2.PolyMorphism
3.Encapsulation
4.Abstraction
What is inheritance : It is concept by which Properties of Parent is Automatic get transfer to its child
Loan Management System:
Class Loan
{
// Common Things : 200 loc
}
class PLoan extends Loan class Eloan extends Loan
{ {
//300 loc //300 loc
} }
class VLoan extends Loan Class HLoan extends Loan
{ {
//300 loc //300 loc
} }
Total LOC: 2000 LOC
Development Hours : 20 hrs
Compiler becomes Slow
Total LOC: 1400 LOC > after using inheritance
Developement Hours : 15 hrs
Compiler is Fast
Code will become easy to Change/Update
IS-A relationship
Every Vehicle Loan IS-A Loan
Every Education Loan IS-A Loan
Every Personal Loan IS-A Loan
Every Loan IS-A Vehicle Loan > Not true
Vehicle Class
Car Class
Every Car IS-A Vehicle
Every Vehicle is not a Car
---------------------------------------------------------------------------------
PolyMorphism:
------------
Poly- Many
Morphism - forms
Testing: A process in which we compare expected & Actual Behavior
1.Method Overriding
Needs two Classes with Parent & Child relationship
There will One Method in Parent & same n Child also but with different implementation/coding.
2.Method OverLoading
Overriding Overloading
1.Two Classes with Parent & Child 1.Only One Class needed
Relationship
2.Same Method is Present in 2.In Same class we will same method name
both class(in Parent as well as in Child) with different argument/Parameter
------------------------------------------------------------------------------------
You need to Make Animal Parent Class & Dog,Cat will be Child Class.
And You need to implement method overriding Concept.
-----------------------------------------------------------------------------------
Encapsulation:
-------------
Basic Encapsulation:
1.Combining Data Members + Behavior(Methods) into Single unit
Encapsulation : Hiding importanat data(unnessary things)
Tight Encapsulation :
public : Visible to all
protected / default : Visible within Package
private : Visible within Class
---------------------------------------------------------------------------------------
Interface : It is set of rules/protocol/ guidelines
-----------
Why all GSM SIM Sim Supports All GSM Mobile
Why all USB Mouse Supports All laptop/Computer
-------------------------------------------------------------------------------------
Interface: Making protocol of method Names
Samsung
incoming call
outgoing call
incoming sms
outgoing sms
D1 D2 D3 D4
Jseries Eseries Galaxy Guru
---------- --------- ------ -----
in_call incoming_call in_calling incoming_calling
in_sms incoming_sms in_smsing incoming_smsing
Child c=new Child();
Parent p=new Child()
Basic_feature b=new Jseries();
Basic_feature b=new Eseries();
WebDriver is a Interface & ChromeDriver, FirefoxDriver, Opera Driver are Classes which implements WebDriver
WebDriver driver=new ChromeDriver(); // Parent p=new Child()
Note: Here, Child Specific Method will get hide.
Interface Abstract CLass
1.Only Declarations are there It can have method with body & without body
(No Body for Method)
2. 'implements' keyword used 'extends' keyword is used
for Child Class
3.Developer do not know 3.When Devloper knows implementation of
Coding for any function some function & don't know for some function
Or While making common
protocol for all developer
Exception Handling is used to avoid abnormal termination of Programme
Types:
Checked Exeption : Compiler gives error before running code (High Chance Occurance)
UnChecked Exeption : Compiler do not give error before running code (Less Chance Occurance) i.e ArithmeticException
Comments
Post a Comment