INTERFACE
1. Interface is a group of
constant and method declaration. An interface may be created fro different
classes
2. Through interface polymorphism
is supported by java.
DIFFERENCE BETWEEN INTERFACE AND ABSTRACT CLASS.
1.
interface
can be used to achieve multiple inheritance; abstract class can be used as a
single inheritance.
2.
Variables declared in a Java interface is by
default final. A Java abstract class may contain non-final variables.
3.
Memebers of a Java interface are public by default. A
Java abstract class can have the usual flavors of class members like private,
protected, etc. or abstract
class may contain non-public members.
4.
Java interface should be implemented using keyword
“implements”; A Java abstract class should be extended using keyword “extends”.
5.
A Java class can implement multiple interfaces but it can
extend only one abstract class.
6.
interface
is more flexible than abstract class because one class can only
"extends" one super class, but "implements" multiple
interfaces.
DIFFERENCE BETWEEN CLASS AND INTERFACE
1. Interface is little bit like a class...
but interface is lack in instance variables....that's u can't create object for
it.....
2. Interfaces r developed to support multiple inheritance...
3. The methods present in interfaces r pure abstract.
4. The access specifiers public,private,protected r possible with classes.but the interface uses only one spcifier public.
2. Interfaces r developed to support multiple inheritance...
3. The methods present in interfaces r pure abstract.
4. The access specifiers public,private,protected r possible with classes.but the interface uses only one spcifier public.
