difference between interface and class in java code example
Example 1: difference between class and object in java
Class is a blueprint or template which
you can create as many objects
as you like. Object is a member or
instance of a class.
Class is declared using class keyword,
Object is created through new keyword
mainly. A class is a template for objects.
A class defines object properties
including a valid range of values, and
a default value.
A class also describes object behavior.
An object is a member or
an "instance" of a class and has states
and behaviors in which all of its
properties have values that you either
explicitly define or that are defined
by default settings.
Example 2: difference between class and interface in java
A class can be instantiated by
creating its objects.
An interface is
never instantiated as the methods
declared inside an interface are abstract
and does not perform any action,
so there is no use of instantiating any
interface.
A class is declared using a keyword class.
In the same way, an interface is
created using a keyword interface.
The members of a class can have
access modifier like public, private, protected.
But the members of an interface
are always public as they have to be accessed
by the classes implementing them.
The methods inside a class are
defined to perform an action on the fields
declared in the class.
The methods inside an interface are purely abstract.
A class can implement any number
of interfaces but can extend only one
super class.
An interface can extend any number
of interfaces but cannot implement any
interface.
A class has constructors defined inside
it to get the variable initialized.
But, an interface does not have any
constructors as there are no fields
to be initialized. The fields of an
interface are initialized
at the time of their declaration only.
Example 3: diff between class and interface
A class describes the attributes and behaviors of an object .
An interface contains behaviors that a class implements.