Question on Threads

[Mohit G Gupta]

Kb Book THreads Self-test pg-782

  public class Starter implements Runnable {
  void go(long id) { 
    System.out.println(id); 
  }
  public static void main(String[] args) {
    System.out.print(Thread.currentThread().getId() + " ");
    // insert code here   }
  public void run() { go(Thread.currentThread().getId()); }
}  

And given the following five fragments:
I. new Starter().run();
II. new Starter().start();
III. new Thread(new Starter());
IV. new Thread(new Starter()).run();
V. new Thread(new Starter()).start();

When the five fragments are inserted, one at a time at line 9, which are true? (Choose all that apply.)
A. All five will compile
B. Only one might produce the output 4 4
C. Only one might produce the output 4 2
D. Exactly two might produce the output 4 4
E. Exactly two might produce the output 4 2
F. Exactly three might produce the output 4 4
G. Exactly three might produce the output 4 2


Ans: C And D

i too think that C is correct but how's D possible.can anyone explain

only III,IV V would work when inserted ,but only V would result in any output.

[Abimaran Kugathasan]

For D, What about fragment I and IV?

[Mohit G Gupta]

what do you mean to say Abimaran Kugathasan ?

[Henry Wong]

mohitkumar gupta wrote:what do you mean to say Abimaran Kugathasan ?

He means... why don't you think I and IV will run, and produce any output?

Henry

[Abimaran Kugathasan]

mohitkumar gupta wrote:what do you mean to say Abimaran Kugathasan ?

The fragments I and IV will work, and the output may be 4 4. (We can't tell sure that Thread ID is 4, but for this question, it'll print same ID, because same thread will run in the code)

[Abimaran Kugathasan]

And, Henry, could you please check your private message regarding a topic?

Thanks in Advanced!

[Vijitha Kumara]

The fragments I and IV will work, and the output may be 4 4. (We can't tell sure that Thread ID is 4, but for this question, it'll print same ID, because same thread will run in the code)

That's why the answer says "Exactly two might produce the output 4 4"', It's the nature of the output not the exact value.

[Abimaran Kugathasan]

Vijitha Kumara wrote:
That's why the answer says "Exactly two might produce the output 4 4"', It's the nature of the output not the exact value.

Yea, The answers C and D, that's why I told it earlier!