Can an object have several different classes?

Answer 1

Inheriting multiple base classes is not allowed in Java. If you are curious asking me why doesn't java allow multiple inheritance, think about this scenario. Let us say the Automobile Class has a drive() method and the Car class has a drive() method and the Ferrari class has a drive() method too. Let us say you create a new class FerrariF12011 that looks like below:

Public class FerrariF12011 extends Ferrari, Car, Automobile {…}

And at some point of time you need to call the drive() method, what would happen? Your JVM wouldn't know which method to invoke and you may have to instantiate one of the classes that you already inherit in order to call its appropriate method. Sounds confusing right? To avoid this nonsense is why the creators of java did not include this direct multiple inheritance feature.

Answer 2

Yes just hit new- class. That's kinda the point of java...

Answer 3

No. In Java a class can extend only one class. that means, a class can have only a single parent.

but if you need multiple inheritance you can implement as many interfaces as you want.