doubt regarding threads

[NagarajGoud uppala]

Hi,
This is from k&b threads,selftest(pgno:768,qno:13)

  
public class Starter implements Runnable
{
 void go(long id)
 {
  System.out.println(id);
 }
 public static void main(String[] args)
 {
   System.out.println(Thread.currentThread().getId()+" ");
   //insert code here-------------->1
 
 }
 public void run(){go(Thread.currentThread().getId());}
}
  

1.new Starter().run();
2.new Starter().start();
3. new Thread(new Starter());
4. new Thread(new Starter()).run();
5. new Thread(new Starter()).start();

if we place the above statements at line 1 in code which is true?
answers are:
c.only one might produce the output 4 2
d.exactly two might produce the output 4 4

my doubt is how can we find out the answer ? i run the above code
for 4 i got output-- 1 1
for 5 i got output--1 8

i am using 1.6 version. i am confusing which is correct ? how?
please any body explain me step wise

[Henry Wong]

my doubt is how can we find out the answer ? i run the above code
for 4 i got output-- 1 1
for 5 i got output--1 8

i am using 1.6 version. i am confusing which is correct ? how?
please any body explain me step wise

I think that you are misinterpreting the questions here. The "2" and "4" aren't (or may not be) the actual numbers. The significance is whether the numbers are the same or different -- meaning whether or not the code is being run by the same thread or different thread.

Henry

[NagarajGoud uppala]

I think that you are misinterpreting the questions here. The "2" and "4" aren't (or may not be) the actual numbers. The significance is whether the numbers are the same or different -- meaning whether or not the code is being run by the same thread or different thread.

Henry

Hi Henry,
Thanks for giving some clarity.you mean if the same thread is run it,the numbers will be same and if the different thread run it numbers will be different. isn't it??
if my understanding is wrong please correct me