1. Start NetBeans and create a a new project named DataFiles
2. Enter the following in the Main class

package datafiles;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;
/**
 * @author  
 */
public class Main {
   public static void main(String[] args)
      throws FileNotFoundException  
   {
      // Ask user for name of input file 
	Scanner console = new Scanner(System.in);
      	System.out.println("Input file: ");
	//inputFileName holds the name of the input file, use full path name
      	String inputFileName = console.next();  
        // Ask user for name of output  file 
	 System.out.println("Output file: ");
        //outputFileName holds the name of the input file, use full path name
         String outputFileName = console.next(); 
      // construct a FileReader object using the name of the input file
	FileReader reader = new FileReader(inputFileName);
      // construct a Scanner object named in using the object named reader
     	 Scanner in = new Scanner(reader);
     // construct a PrintWriter object naned out using  the name of the output file
	 PrintWriter out = new PrintWriter(outputFileName);

         double coco;  // variable to hold an input datum
         double sum = 0.0; // sum of the data
         int numData = 0;  // number of data elements
         double mean = 0.0; // mean of the  data values
      while (in.hasNext()) 
      {
	coco = in.nextDouble();
        sum = sum + coco;
      }
      // to write information to the output file 
	out.println( "This line is in the output file");
        out.println("Ther were " + numData + " data read");
        out.println("The sum is " + sum);
        out.println("The mean of the data is" + mean);
        
   //  close the output file when ready
      out.close();
   }
}