is it??

Objects Implement Roles
A convenient way to illustrate the difference between class inheritance and interface inheritance is to consider roles object may take on. The role of "The Terminator" may be described via:

interface Terminator {
public void doRandomViolence();
}

This role may be "played" by any number of objects such as:
class Arnold extends Actor implements Terminator {
public void doRandomViolence() {...}
...
}

and

class Dilbert extends Geek implements Terminator {
public void doRandomViolence() {...}
...
}
Arnold and Dilbert have totally different identities (Actor versus Geek,
respectively), but both may play the role of "The Terminator."
A single object may play multiple roles; e.g., Dilbert is also able to play the role
of an engineer (it is not true that all geeks are engineers so we cannot rely on class
Geek having the necessary engineer interface):
class Dilbert extends Geek
implements Terminator, Engineer {
public void doRandomViolence() {...}
public void borePeople() {...}
}
where Engineer is defined as:
interface Engineer {
public void borePeople();
}

I was reading the java tutorial and found out this!!
do we really bore ppl and all the engineers are geeks!!!...:O..:P
check the picture.