checksumFinderCode

package robertskostalproject;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.JOptionPane;

/**
 * @author RobertEnglish
 */
class checksumFinder {


    public static long l1 = 1;
    public static long l2 = 0;

    String HexFinder(File folderFile, String line, String Hex1, String Hex2)
    throws FileNotFoundException, IOException {



         BufferedReader reader = new BufferedReader(new FileReader(folderFile));
        try {
         line = reader.readLine();//Reads all lines up to "[Device|Sensors|Checksum]"

         do {//read line then check if line is "[Device|Sensors|Checksum]" WHILE line isn't ";end of section [Device|Sensors|Checksum]"

           line = reader.readLine();

           if (line.equals("[Device|Sensors|Checksum]")) { //IF line is "[Device|Sensors|Checksum]" then
                                                           //(check if line is "Value") ELSE read next line
             do {// DO read line and (check if line is "Value") WHILE line doesn't contain "Value"

               if (line.contains("Value")) { // IF line is "Value" then retrieve necessary value
                                            // ELSE read next line

                 Hex1 = line.split("=")[1].trim();
                 l1 = Long.parseLong(Hex1.substring(2), 16);

                 System.out.println("Here's the line read  " + line);
                 System.out.println("Here's the hex number from the line  " + Hex1);
                 System.out.println("Here's the integer from the hex number  " + l1 + "\n");

                 break;
               }
             } while (!"Value".contains(line = reader.readLine()));//while2

             line = reader.readLine();  //Reads the line AFTER the first "Value" has been found

             do {//  Read line and check if line has "Value" WHILE line doesn't contain "Value"

              if (line.contains("Value")) { // IF line is "Value" then retrieve necessary value
                                           // ELSE read next line

                Hex2 = line.split("=")[1].trim();
                l2 = Long.parseLong(Hex2.substring(2), 16);

                System.out.println("Here's the line read  " + line);
                System.out.println("Here's the hex number from the line  " + Hex2);
                System.out.println("Here's the integer from the hex number  " + l2 + "\n");

                break;
              }
            } while (!"Value".contains(line = reader.readLine()));

            while (!";end of section [Device|Sensors|Checksum]".equals(line)){
               line = reader.readLine();
            }
          }
        } while (!";end of section [Device|Sensors|Checksum]".equals(line));


        if (l1 == l2) {
          JOptionPane.showMessageDialog(null, "Both checksum values ARE equal!");
        } else {
          JOptionPane.showMessageDialog(null, "Both checksum values NOT equal");
        }

    } catch (IOException e) {
      System.out.println("IO Exception: Could not read file!\n");
    }
     return null;
   }
}