Reg. Runnable

[Angela Narain]

Another example from Barry Boone's exam :

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("-");
   }
} 

1.nothing 
2.100 dots (.) 
3.200 dots (.) 
4.100 dashes (-) 
5.100 dots (.) and 100 dashes(-) 

The correct answer is 1
But it should get compile time error as Dots implements
Runnable but does not provide the run() method.

[james hoskins]

hello angela,
you are right, no run() method means Dots must be declared abstract.
kind regards,
james