Class in Java

Hello friends how are you, today in this blog i will teach you what is class and object, syntax of class, how class works and many programs using class  in a very simple way. 

Let's start  

Object

Object is having states and behaviors in which state means what does it has and behavior means what does it do. for example a pen has
States: ink,nib,needle,cap etc
Behaviors: Writing.

Class

1.It is a collection of data members and member functions.
2.Data members are the variable used inside class.
3.Member functions are the function used inside class.
4.It is also called User-defined data type.

Syntax of class

Example

Important point to remember while making class program
⇒Declare variable with appropriate data type as per your requirement
for example to find the area of rectangle three variable are sufficient(height, width and area)
⇒Declare function as per your requirement
for example to find the area of rectangle single function findArea() is sufficient.
⇒Create instance(object) of class to access the data member and member function of a class.
classname objectname;
Example:- Rectangle rec1;
Here Rectangle is the name of class and rec1 is the name of object.
⇒Accessing data member and member function
Data member and member function of a class can be accessed using Dot(.) operator.
⇒Accessing data member
rec1.height;
⇒Accessing member function
rec1.findArea();

class Rectangle
{
//Data Member 
int height;
int width;
int area;
//Member function
void findArea()
 {
  area=height*width;
  System.out.println("Area of Rectangle="+area);
 }
 public static void main(String[] args) 
 {
  //creating object
  Rectangle obj=new Rectangle();
  //accessing data member
  obj.height=25;
  obj.width=15;
  //accessing member function
  obj.findArea();
 }
}
/*
### Output ###
Area of Rectangle=375
*/

Example 2

class Rectangle
{
//Data Member 
int height;
int width;
int area;
//Member function
void getPara()
{
  height=15;
  width=25;
}
//Member function
void findArea()
 {
  area=height*width;
  System.out.println("Area of Rectangle="+area);
 }
 public static void main(String[] args) 
 {
  //creating object
  Rectangle obj=new Rectangle();
  //accessing member function
  obj.getPara();
  obj.findArea();
 }
}
/*
### Output ###
Area of Rectangle=375
*/

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