Multiple inheritance means: a class that extends two classes.
But if you make a "chain": B extends A, and C extends B - then that is not multiple inheritance.
Java doesn't have multiple inheritance because it causes some hard problems like the diamond problem and because it's not an essential feature. A large part of Java was designed to look like C++, but with the hard parts left out. This is an example of a C++ feature that was left out of Java.