How to handle large number of Threads !!?

Question

hello friends,
i done a program that is digging all files and folders for finding given filename
in this logic i created one thread per directory and and that thread list out all
sub files and directory and matches the search filename string , in that if sub
directory found than it creates new thread and forth ..
problem is after running program , at point it is creating large thread around
3000 threads and system goes down ,
so what should be solution for that?
requesting you to suggest the good scheduling of thread that give better performance of the system
logic code is given below:
import java.io.File;
class DiggtheFiles implements Runnable
     private File     currentdir     = null;
     private String     search          = "";
     DiggtheFiles(File file, String search)
          this.currentdir = file;
          this.search = search;
     private File     files[]     = null;
     public void run()
          files = currentdir.listFiles();
          if (files != null && files.length > 0)
               synchronized (this)
                    for (int i = 0; i < files.length; i++)
                         if (files.isDirectory())
                              data.dircount++;
                              if(files[i].getName().contains(search))data.filearry.add(files[i].getAbsolutePath());
                              *new Thread(new DiggtheFiles(files[i],search)).start();*
                         else
                              if(files[i].getName().contains(search))data.filearry.add(files[i].getAbsolutePath());
                              data.filecount++;
               Filechooserpanel.consolearea.setText("DIR:" + data.dircount
                         + " FILE:" + data.filecount + " Thread Completed:"
                         + data.threadcount);
               data.threadcount++;
               return;
          else
               data.threadcount++;
               return;

Answer 1

Remove the synchronized and use a work list instead of doing new Thread(), do workList.add() instead and have a threadpooledexceutor take workitem of the list.
Or go non-parallel and just do a recursion-call?