If `Object` is the superlcass of all, why we say Java doesn't have multiple inheritance?

Question

Why a subclass cannot have multiple superclass?

And if multiple inheritance is not possible in Java, then why a subclass B(say) can have a superclass A(say) and also has the Object class which is the superclass of all classes?

Answer 1

Java doesn't support multiple inheritance.

The simplest multiple inheritance is like this:

A        B
 \      /
  \    /
   \  /
    C

While your example in Java is like this:

Object
  |
  |
  |
  A
  |
  |
  |
  B

which is multiple levels of single inheritance.