Difference betwen reference variable & object

[deepikakasi kasi]

Thanks 4 replying my doubt immediately...

How I got the doubt is that

INSTANCE OF-----Operator is nothing but Subclass object is assigned to super class refernce variable.....Is that Right???


In that I got the doubt of refernce variable & object


with lots of thanks & regards,
Deepika.K.

[Bauke Scholtz]

INSTANCE OF-----Operator is nothing but Subclass object is assigned to super class refernce variable

I don't understand this statement.

The instanceof expression will evaluate to true when the object assigned to the given reference variable (the left hand of the expression) is an instance of the given (sub)class (the right hand of the expression).

Example:

Object o1 = new String();
 
boolean b1 = o1 instanceof Object; // true, it's the superclass of String.
boolean b2 = o1 instanceof String; // true, it's the class itself.
boolean b3 = o1 instanceof Number; // false, this is another subclass of Object.