Txt file read in- StringTokenizer- Try Block Catch for errors

Question

Hello
So I am having a few issues with a school project. First is with my ReadWithScanner. It does not read in the file giving me a NullPointerException error on the line <Scanner in = new>. I have tried a few other read in files and they do not seem to be working.
I am also stuck on the logic on the try block catch statement. How does a person set up a �custom� try block that looks for errors like the ones below? I have attempted to start in the commented code.
The text file has to read in 1000 individual lines of code and are separated by �;� and should be separated into tokens with the StringTokenizer class what I attempted to do below also. Both are mere attempts and need help�
This is some what of the logic I thought of doing
1.Read the first line in first with the scanner class
2.use delimiter separated by �;�
3.Tokenizer the line into separate tokens- invoiceCode, fName, lName�
4.Check classes- check Name, check Date, checkPrice, checkPrice, checkGenre, checkShippingDate invoiceCode = "Error Code" checkInvoiceCode(String invoiceCode)checkName(String name), checkPrice(String price), checkGenre(String genre)
5.Apply the regular expressions to each try block statement
a.Assign a letter to each error for example if invoice was to short it would be assigned a letter A
b.If invoice does have the right characters it would be assigned B
c.If name has to few words it would be assigned D
d.�
This is an example of a good field from the text file
XYG726;Smith,Mr. John M.;29.96;comedy;101008;100604
Not so good line
Lu15;Will, Mark;50.00;Science;030305;030807
The file should then be printed out in the program not to a text file. It only needs to print the invoice number and error code letter assignment.
If you have any questions feel free to let me know. Thanks for all or any help you have to offer.
Invoice
Three upper case letters followed by three digits
Regular Expression "[A-Z]{3}[0-9]{3}"
Customer Name
Should be in the form: last name followed by a <,> optional title (Mrs. Mrs�) then first name optional middle initial Titles must be
So regular expression something like �[a-z][A-Z]+([A-Z]{1}?[a-z][./})+[a-z][A-Z]�
Sale Price
Two decimal digits to the left of the decimal point. The price should not have a leading zero.
Regular Expression [0-9]{2}*./[0-9]
Genre
The genre should only contain lowercase letters. Regular expression �[a-z]�
ShipDate and Order Date-
Must be standard dates- MMDDYY. The order date and shipping date has to be after today�s date. Regular expression �[0-9]{2}+[0-9]{2}+[0-9]{2}�
package Project3;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.*;
import java.util.Scanner;
public class ReadWithScanner {
private final File fFile;
public static void main (String args[]){
Scanner in = new Scanner(new File("e:\\work_space_java\\Project\\Package3\\movie.txt"));
Scanner.processLineByLine();
public ReadWithScanner(String aFileName){
fFile = new File(aFileName);
public final void processLineByLine(){
try {
//use a Scanner to get each line
Scanner scanner = new Scanner(fFile);
while ( scanner.hasNextLine() ){
processLine( scanner.nextLine() );
scanner.close();
catch (IOException ex){
protected void processLine(String aLine){
//use a second scanner again to raed the content of each line
Scanner scanner = new Scanner(aLine);
scanner.useDelimiter(";");
if (scanner.hasNext() ){
//read each file?
String name = scanner.next();
String value = scanner.next();
else {
scanner.close();
//Token Names that are seperated
StringTokenizer st;
String invoiceCode = st.nextToken();
String fname = st.nextToken();
String lname = st.nextToken();
String price = st.nextToken();
String genre = st.nextToken();
String orderDate = st.nextToken();
String shipDate = st.nextToken();
String invoiceCode;
invoiceCode = "A" checkInvoiceCode(String invoiceCode);
Pattern p = Pattern.compile("[a-z]{6}[A-Z]{6}[0-9]{6}");
Matcher m = p.matcher(invoiceCode);
p.matcher(invoiceCode);
if(m.matches()) {
System.out.println(invoiceCode);
else {
System.out.println ("A");
try
invoiceCode = Integer.parseInt(String);
catch (NumberFormatException e)
{ System.out.println ("B"); System.exit(1); }
*/

Answer 1

I have made a quite a few updates to my code. Please look it over again. I have also made many comments to help with the logic. Once again if you have any questions please feel free to ask. Sorry about not using the tags before- I was no aware of them. Thanks for the advice sabre150.
package Project3;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.*;
import java.util.Scanner;
public class ReadWithScanner {
     private final File fFile;
     public static void main (String args[]){
               //read in text file from directory currently it can not read the file
              Scanner in = new Scanner(new File("e:\\work_space_java\\Project\\Package3\\movie.txt"));
              //Scans each line of the text in
              Scanner.processLineByLine();
            //assigns new file name to file
            public ReadWithScanner(String aFileName){
              fFile = new File(aFileName); 
            public final void processLineByLine(){
              try {
                //use a Scanner to get each line from the processLineByLine
                Scanner scanner = new Scanner(fFile);
                while ( scanner.hasNextLine() ){
                  processLine( scanner.nextLine() );
                scanner.close();
              catch (IOException ex){
            protected void processLine(String aLine){
              //use a second scanner again to read the content of each line
               //delmiter should then break each line in the text file into seperate "tokens"
              Scanner scanner = new Scanner(aLine);
              scanner.useDelimiter(";");
              if (scanner.hasNext() ){
                   //reads each line from scanner
                String name = scanner.next();
              else {
              scanner.close();
           /*Convert Tokens from Scanner into String Tokenizer with assigment to each variable
            * I am missing something
            * Need to convert each line read from the scanner (name variable) to the String
            * Tokenizer class
          //Tokens names now assigned a varaible
          StringTokenizer st;
          String invoice = st.nextToken();
          String name = st.nextToken();
          String price  = st.nextToken();
          String genre = st.nextToken();
          String orderDate = st.nextToken();
          String shipDate = st.nextToken();
      /*If statments (Try Block Statements?) with Regular Expressions
      * This is where I have the most issues on how to set up
      * "custom" try and block errors trying to match what I have
      * in the regular expressions. 
      * I believe try and catch statements
      * make this easier but I have used 'match' and 'pattern' with if
      * statments.  If try block statements are easier please show!
      * Regular Expressions may not be correct either
       invoice = checkInvoiceCode(invoice);
       //Defined cerita for Inovice are:
       //Error A = Invoice code is too short  
       //Error B = Invoice code does not have the right characters 
       //Error C = Invoice code digits are all zero
       //Checks for error A
       //Has at least six characters
        Pattern invoiceShort = Pattern.compile("{6}");
        Matcher shortInvoice = invoiceShort.matcher(invoice);
        p.matcher(invoiceCode);
        if(m.matches()) {
             System.out.println(invoice);      
        else {
             System.out.println ("A");
        //Checks for error B
        //3 Upper Case Letters followed by three numbers,
        Pattern rightChar = Pattern.compile("[A-Z]{3}[0-9]^0{3}");
        Matcher charRight = rightChar.matcher(invoice);
        p.matcher(invoiceCode);
        if(m.matches()) {
             System.out.println(invoice);
        else {
                 System.out.println ("B");
        //Checks for error C
        //Where the last three digits are not all zeros
        Pattern notZero = Pattern.compile("*{3}^0{3}");
        Matcher ZeroNot = notZero.matcher(invoice);
        p.matcher(invoiceCode);
        if(m.matches()) {
             System.out.println(invoice); 
             else {
                 System.out.println ("C");
     //name = checkFullName(name);
     //Error D = Name field has fewer than two words
     //Error E = Name field has more than four words
     //Error F = Name field has no comma
     //Error G = Name field has a bad title 
     //Error H = Name field has a bad initial 
    /*Have a lot more to do...
    * Still need to go through the same if statement or Try Block statements with this data:
    *      String fname = st.nextToken();
          String lname = st.nextToken();
          String price  = st.nextToken();
          String genre = st.nextToken();
          String orderDate = st.nextToken();
          String shipDate = st.nextToken();
    * But for now I would like to see an example of an if statement I could use
    * (if mine is even right) or catch statement- the rest of the project we look
    * for similar certia as defined in the reg exp for invoice
     /*Writes to Report in the Console
     * Prints data into two columns:
     * Invoice Code and Error Type
     //Prints both column Headings
     private void columnHeadings ()
     System.out.println (padL("",5) +
     padL("Invoice",20) +padL("",20)+
     padL("Error Code",40));
     //movie is the name of the text file
     private void printMovie(Movie aReport) {
     System.out.println(aReport.getInvoiceCode()+"\t"+
           aReport.getErrorType()+"\t");
  *This method pads the string start to the length newLength leaving the
  *string left justified and returning the result.
  private String padL (String start, int newLength)
     String result = new String (start);
     while (result.length() <= newLength) result += " ";
     return result;
  } // end padL
   * This method pads the string start to the length newLength leaving the
   * string right justified and returning the result.
  private String padR (String start, int newLength)
     String result = new String (start);
     while (result.length() <= newLength) result = " " + result;
     return result;
// end padRThanks a lot.