Non Static inner classes have object instances that are 
associated with the classes outer class.Static inner 
classes have no object instances.

Static inner class 
can only access the static members of the enclosing class.
not associated with the instance of the enclosing class.
can only have static members.

Nonstatic class
is associated with the instance of the enclosing class.(we 
need it first to access the nonstatic class)
can access all the member of the encosing class.
is like other members of the enclosing class.

non static inner classes can access all the members of the 
outer class i.e both static and nonstatic members.In 
nonstatic inner classes we cannot have static declarations 
done.To access  non static inner class members we outer 
class reference.

static inner classes can access only static members of the 
outer class.In static inner class we can have static 
declarations done. To access  static inner class members
no need of outer class reference.