Java Program to read all Files from Directory or Sub Directory For Some Period of time ?

Previously we have discussed the Program for 

Java Program to Calculate Factorial of given Number ?

This program is to read all files and files inside the folders for some period of time.In this program we have used the listFiles() method of File class which return all files and folders in array of File Type ,then we have used for loop to read all files and sub files .

import java.io.File;

public class ReadAllFiles {

 static void readDir(String filePath){
  long start = System.currentTimeMillis();
  long end = System.currentTimeMillis() + 60 ;
  File f = new File(filePath);
  if(f.exists()){
   File[] listFile = f.listFiles();
   for(File name : listFile){
    if(start > end){
     System.err.println("TIME OUT");
     System.exit(1);
    }
    else{
     if(name.isDirectory()){
      readDir(name.toString());
     }
     else{
      System.out.println(name);
     }
    }
    start++;
   }
  }
  else{
   System.err.println("PATH NOT FOUND");
  }
 }
 public static void main(String[] args) {
  readDir("D:/");
 }

}