File Watcher Program in Java

Java Program to create a class called File Watcher that can be given several file names
that may or may not exist. the class should start a thread for each file name
Each thread will periodically check for the existence of it's file.
If the file exist,the thread will write a message to the console & then end.

import java.io.*;
class SlipFileWatch
{
 public static void main(String args[]) throws IOException
  {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("\n Enter Several N  files");
        try
        {
          int n =Integer.parseInt(br.readLine());
          System.out.println("\n Enter File name");
          for(int i=1;i<=n;i++)
                  new FileWatcher(br.readLine());
        }  
        catch(Exception e)
        { System.out.println("Invalid Input");}
    }
}   
   
class FileWatcher implements Runnable
{
    Thread T;
    String fname;
    FileWatcher(String fn)
    {
        fname=fn;
        T=new Thread(this,fname);
        System.out.println("\n\nNew = "+T);
        T.start();
    }
   
    public void run()
    {
        File f = new File(fname);
        if(f.exists())
          System.out.println(" "+fname+"  File Exist ");
        else 
          System.out.println(" "+fname+"  File Not Exist");
         try
          {
              Thread.sleep(1000);
          }
          catch(InterruptedException it){}
    }
}