Class in Java Programming
When I first saw Class in Java, I thought it was this class
in Java and from that date on now. Whenever we talk about Java it's really
incomplete without classes, everyone who is familiar with Java knows that it's
purely object-oriented language means everything we discussed in java as an
object. That is why it is very important for the student or for those who are
interested in knowing about java to know about java class, then only they can
advance in the world of java.
In this article, we will look at what Java Class, Example
of Class in Java is and what a Java class does including members, field and
method.
Class
in Java Programming Example
What is Java Class?
Java class is nothing
but a template for object you are going to create or it’s a blue print by using
this we create an object. In simple word we can say it’s a specification or a
pattern which we define and every object we define will follow that pattern.
What
does Java Class Consist
§ When
we create class in java the first step is keyword class and then name of the
class or identifier we can say.
§ Next
is class body which starts with curly braces {} and between this all things
related with that class means their property and method will come here.
Template is:
Class (name
of the class) {
(Here
define member of class)
}
Access
level of class:
Java class
has mainly two type of access level:
Default: class objects are accessible only inside the package.
Public: class objects are accessible in code in any package.
What are members of Class?
When we
create a class its totally incomplete without defining any member of this class
same like we can understand one family is incomplete if they have no members.
Field: field is nothing but the property of the class or object which we
are going to create .for example if we are creating a class called computer
then they have property like model, mem_size, hd_size, os_type etc
Method: method is nothing but the operation that an object can
perform it define the behavior of object how an object can interact with
outside world .startMethod (), shutdownMethod ().
Access
Level of members: Access level is nothing but where we can use that members of
the class.
Each field
and method has an access level
:
- private:
accessible only in this class
- package or
default:
accessible only in this package
- protected:
accessible only in this package and in all subclasses of this class
- public:
accessible everywhere this class is available
Real
world example of Class in Java Programming:
In the real world, if we want to understand about the class, anything of
the same quality can be visualized as a class, p. Men, women, birds, bikes,
cars or we can say vehicle.
The whole vehicle will take a class with no_of_wheels property, color,
model, brand, etc. Now we can think of changeGear () and speedOfvehicle (),
applyBreak () etc as a method in this class. Likewise, every human being can
also be a class, now its member will be a man, a woman, a child., IsAlive (),
isDeath () may be his method or behavior of this type. Again, we can turn men
or women into a separate class and define their properties and methods
accordingly,
In short, in Java, every problem we get may be thinking in terms of class
and object.
One
Java class example:
Class Stock {
Public commodity;
Public price;
Public void buy (int no_of commodity) {}
Public boolean sale () {}
}
In this
example Stock is called Class and commodity, price are field and buy() and
sale() are two methods defined inside class. To access elements of Class you
need to create an instance of class Stock. You can create instance of Class
using keyword new as shown below
Stock highBetaStock = new Stock();
For calling
method of Stock just call by using instance.
highBetaStock.buy(1000);
highBetaStock.sell();
In short, in java everything must be thinking in
terms of java class, nothing more than a model, they have their own members and
methods to access these members. The entire member has its own visibility,
which is decided by the developer where they want to use these objects.
To getting expert-level training for Java Training in your location
– java training in chennai | java training in bangalore | java training in pune | java training in chennai | java training in bangalore | java training in tambaram | java training in omr | java training in velachery | java training in annanagar | java training in chennai | java training in marathahalli | java training in btm layout | java training in jayanagar | java training in rajaji nagar | For getting java online
training | java online training
No comments:
Post a Comment