IN java collections we have both interfaces and classes.
instead of using interfaces why we can't use classes only
like that why we can't use interfaces only. why we need two
things interface and class.
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Answer Posted / shaik baji
Interface in the sence a generic templet that means it will
define a generic functionalities of a group.
For Ex:- We can say "Car" as an interface
1)let's asume if you want a List interface functionalities
the your class should implements the List interface, that
means you should implement all the methods which are
available in List interface even you are not using all the
methods so that the Java developers designed the classes
which are implements the java.util interfaces.
Now if you want any interface functionalities then you just
create an object of that related java.utill package class
and call the methods by using the object.
2)Java doesn't support multiple inheritance.We achieve
multiple inheritance using interface concept.A class can
have only one super class and number of interface.
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