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 / sarath
Both of them have different purpose.
A Class have state(Fields) and behaviour(Methods). But in Interface we are telling a common behaviour.
for example I have a class called ABCBycycle.java . It implements some common behaviour of bycyle from Bycycle interface,
by implementing the Bycycle interface we are telling that ABCBycycle.java have some common behaviour of bycyle.
So iterface not the blue print of state and behaviour.
But Class is the blue print of some state and behaviour
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