Boonie's Exam: 47 - mistake??

[Alfred Kemety]

In Boonie's Exam part 3, question 47 is answered wrong I think, actually there is no right choice in the choices it has. It goes
What appears in the standard output when you run the Dots class?

class Dots implements Runnable { 
DotThread t; 
public static void main(String[] args) { 
Dots d = new Dots(); 
d.t = new DotThread(); 
} 
public void init() { 
t.start(); 
t = new DashThread().start(); 
}
} 
class DotThread extends Thread { 
public void run() { 
for (int index = 0; index < 100; index++)  
System.out.print(".");
}
} 
class DashThread extends Thread { 
public void run() { 
for (int index = 0; index < 100; index++)  
System.out.print("-");
}
}

a- nothing
b- 100 dots (.)
c- 200 dots (.)
d- 100 dashes (-)
e- 100 dots (.) and 100 dashes(-)
His answer was:
Question 47: a. The thread's with start() method is never invoked. (This is not an applet, so init() is not automatically invoked.) (See chapter 12.)
-------
Ah, well first of all, the code will never compile since the class Dots that implements the Runnable interface didn't supply an implementation for the abstract run() method in the interface Runnable and thus should be declared abstract itself... or the code won't compile, right?? or am I missing something?

[Barry Gaunt]

I agree with you, Dots has no run() method, and is
not declared abstract. So it's not gonna compile!
I guess Boonie skipped his beta testing...
-Barry

[Jose Botella]

You are right. It will not compile.