Question

runnable in java

Asked by: wrynn

if a class implements runnable, does that mean that everytime you construct the object its run() method is called in a new thread?

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Asked On
2009-11-06 at 18:16:09ID24879843
Topics

New to Java Programming

,

Java Standard Edition

Participating Experts
3
Points
500
Comments
3

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Answers

 

by: objectsPosted on 2009-11-06 at 18:21:18ID: 25764710

no, you need to create a new thread using it and call the threads start method

Thread thread = new Thread(myRunnableObject);
thread.start();

 

by: a_bPosted on 2009-11-06 at 19:32:35ID: 25764858

See if the code snippet below clears things up for you - 


public class Test implements Runnable{
public static void main(String agrs[])
{
	Test test1 = new Test();
	Test test2 = new Test();
	
	Thread t = new Thread(test1);
	t.start();
	t =  new Thread(test2);
	t.start();
} 
@Override
public void run() {
	System.out.println("Running");
	
} 

}
                                              
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by: SunScreenCertPosted on 2009-11-07 at 14:06:13ID: 25768256

When you implement Runnable, the restriction is that you need to override run. And if the run method is called or not depends if you are creating a new thread with that object and starting it. So, i mean to say that if you do not do that, you might end up not making use of a new thread at all. Also, remember you cannot call start on the same object more than one time coz it leads to illegalStateException. In case of doubt, the best way is to try writing a multithreaded program and that would make things much clearer for you. I can help you with some basic programs, if you still need help.

20120131-EE-VQP-002

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