class vs interface code example

Example 1: diff between class and interface

A class describes the attributes and behaviors of an object .
An interface contains behaviors that a class implements.

Example 2: class vs interface

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: class vs interface

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 4: abstract classes vs interfaces

Interface 
1) Interface contains only abstract methods 
2) Access Specifiers for methods in interface
must be public
3) Variables defined must be public , static ,
final
4) Multiple Inheritance in java is implemented
using interface
5) To implement an interface we use
implements keyword

Abstract Class
1) Abstract class can contain abstract methods,
concrete methods or both
2) Except private we can have any access
specifier for methods in abstract class.
3) Except private variables can have any access
specifiers
4)We cannot achieve multiple inheritance using
abstract class.
5)To implement an interface we use extends
keyword