Need help to do multi-threading

Question

Can some one help me in creating an application that constantly polls the specified local directory for any new XML files. When an XML file is detected, it will create a new thread to handle the processing of the file, it will then assign the XML file to the new thread, and move the XML to temp directory.

Answer 1

despite the few information about your program, the usage of timers seems be the best choice:
import java.util.*;
public class MainAppClass
     MainAppClass()
          Timer dirCheck = new Timer();
          long CHECKING_INTERVAL = 20000; // milliseconds
          // you may also include parameters in the TimerTask extended class
          // like the list of directories, etc.
          DirListener dirListener = new DirListener();
          // Now you schedule the TimerTask execution
          dirCheck.schedule(dirListener, 0, CHECKING_INTERVAL);
class DirListener extends TimerTask
     public void run()
          // here you verify the list of directories
          // and launch one thread for each XML file
          // founded in these directories
}take a look in the java.util.Timer and java.util.TimerTask classes