Create an array if threads in java and run

Question

I have a function that creates several threads.For each thread,a constructor takes an object from a different class, so I have first to create an object of this class and then create the thread. Below the code(modified for the simplification of example)

public static void createThread (int n) {
      for(int i=0;i<n;i++){
         someClass obj=new someClass(i);
         ThreadClass myThread=new ThreadClass(obj);
         myThread.run();
        }

The problem here is that I don't really see that threads are running randomly. I am printing each one of them on run() and I see that they are displayed in their order. Is anything wrong with this? Should I run it differently?

Thanks

Use myThread.start(), not myThread.run().

Ryan Amos
– Ryan Amos

2012-12-25 20:52:36 +00:00
Commented Dec 25, 2012 at 20:52 — Ryan Amos
– Ryan Amos, Commented Dec 25, 2012 at 20:52
Add objects to the list and call them randomly

user1326628
– user1326628

2012-12-25 20:53:19 +00:00
Commented Dec 25, 2012 at 20:53 — user1326628
– user1326628, Commented Dec 25, 2012 at 20:53

Ryan Amos · Accepted Answer · 2012-12-25 20:53:31Z

9

Use Thread.start() rather than Thread.run(). Using the run method simply calls that method in the same thread, whereas the start method actually creates a new thread and calls the run method within that thread.

I assume by "randomly", you actually mean interleaving. This should lead to that result.

answered Dec 25, 2012 at 20:53

Ryan Amos

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2 Comments

Rohit Jain Over a year ago

@Cratylus.. From OP's explanation, and his code, it is almost clear that his ThreadClass either extends Thread or implements Runnable.

Avrum Over a year ago

Yes, you're right ThreadClass extends threads. I used start() and suceeded,thanks!!!

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