Answer Posted / ganesh

In java object typecasting one object reference can be type
cast into another object reference. The cast can be to its
own class type or to one of its subclass or superclass types
or interfaces. There are compile-time rules and runtime
rules for casting in java.
Consider an interface Vehicle, a super class Car and its
subclass Ford. The following example shows the automatic
conversion of object references handled by the compiler

interface Vehicle {
}
class Car implements Vehicle {
}

class Ford extends Car {
}

Let c be a variable of type Car class and f be of class Ford
and v be an vehicle interface reference. We can assign the
Ford reference to the Car variable:
I.e. we can do the following

'''Example 1
c = f; //Ok Compiles fine'''

Where c = new Car();
And, f = new Ford();
The compiler automatically handles the conversion
(assignment) since the types are compatible (sub class -
super class relationship), i.e., the type Car can hold the
type Ford since a Ford is a Car.

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