How to use thread to monitor a file

Question

Hi
I have a situation where i want to monitor a file while current java process is running, for example
The process would be like below,i have to do it using Java 1.4
1 Start Main Java Class
2 Start Another thread to monitor a file, from this main Java Class
3 Return control back to main java class to do future processing
4 When the process in this class is done, kill the monitor process.
5 If the file is modified by external process, do some processing in the thread,
What i did was as below, the main java class
Thread t = new Thread(new TestOptimizationThreadWorker());
t.run();
// continue doing the process
t.stop();the other thread class is as below
public class TestOptimizationThreadWorker implements Runnable
     public void run()
          // monitor the external file here
}But some how the control does not come back to main program after i run the thread,
Any suggestions
Ashish
Edited by: kulkarni_ash on Sep 26, 2007 10:06 AM
Edited by: kulkarni_ash on Sep 26, 2007 10:53 AM

Answer 1

Hi
Yes after changing, t.run() to t.start(), it works, but what are the issues you see,
i have attached the whole code below
Java Main Class
public class TestOptimizationThread
     public TestOptimizationThread()
     public String doMessage()
          TestOptimizationThreadWorker tt =     new TestOptimizationThreadWorker();
          Thread t = new Thread(tt);
          System.out.println ("In Do message");
          try
               System.out.println ("Before starting thread");
               t.start();
               System.out.println ("After starting thread");
          catch(Exception exc)
          finally
               System.out.println ("in finally");
               tt.changeB();
          return "";
     public static void main(String args[])
         new TestOptimizationThread().doMessage();
}Java Thread class
public class TestOptimizationThreadWorker implements Runnable
     private boolean b = true;
     public TestOptimizationThreadWorker()
          System.out.println ("Creating this class ");     
     public void run()
          System.out.println ("In Run Method");
          int i =0;
          while(b)
               System.out.println ("int "+ i);     
               i++;
     public void changeB()
          b = false;     
}Ashish