I need help with a lab from programming.

Question

I need the following tasks implemented in the code I wrote below. I would really appreciate if someone could achieve this because it would help me understand the coding process for the next code I have to write. Below are the four classes of code I have so far.
save an array of social security numbers to a file
read this file and display the social security numbers saved
The JFileChooser class must be used to let the user select files for the storage and retrieval of the data.
Make sure the code handles user input and I/O exceptions properly. This includes a requirement that the main() routine does not throw any checked exceptions.
As a part of the code testing routine, design and invoke a method that compares the data saved to a file with the data retrieved from the same file. The method should return a boolean value indicating whether the data stored and retrieved are the same or not.
* SSNArray.java
* Created on February 28, 2008, 9:45 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package exceptionhandling;
import java.util.InputMismatchException; // program uses class InputMismatchException
import org.omg.PortableInterceptor.ORBInitInfoPackage.DuplicateName;
* @author mer81348
public class SSNArray
    public static int SOCIAL_SECURITY_NUMBERS = 10;
    private String[] socialArray = new String[SOCIAL_SECURITY_NUMBERS];
    private int socialCount = 0;
    /** Creates a new instance of SSNArray */
    public SSNArray ()
    public SSNArray ( String[] ssnArray, int socialNumber )
        socialArray = ssnArray;
        socialCount = socialNumber;
    public int getSocialCount ()
        return socialCount;
    public String[] getSocialArray ()
        return socialArray;
    public void addSocial ( String index )
        socialArray[socialCount] = index;
        socialCount++;
    public String toString ()
        StringBuilder socialString = new StringBuilder ();
        for ( int stringValue = 0; stringValue < socialCount; stringValue++ )
            socialString.append ( String.format ("%6d%32s\n", stringValue, socialArray[stringValue] ) );
        return socialString.toString ();
    public void validateSSN ( String socialInput ) throws InputMismatchException, DuplicateName
        if (socialInput.matches ("\\d{9}"))
            return;
        else
            throw new InputMismatchException ("ERROR! Incorrect data format");       
* SSNArrayTest.java
* Created on February 28, 2008, 9:46 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package exceptionhandling;
import java.util.InputMismatchException; // program uses class InputMismatchException
import java.util.Scanner; // program uses class Scanner
import org.omg.PortableInterceptor.ORBInitInfoPackage.DuplicateName;
* @author mer81348
public class SSNArrayTest
    /** Creates a new instance of SSNArrayTest */
    public SSNArrayTest ()
     * @param args the command line arguments
    public static void main (String[] args)
        // create Scanner to obtain input from command window
        Scanner input = new Scanner ( System.in );
        System.out.printf ( "\nWELCOME TO SOCIAL SECURITY NUMBER CONFIRMER\n" );
        SSNArray arrayStorage = new SSNArray ();
        for( int socialNumber = 0; socialNumber < SSNArray.SOCIAL_SECURITY_NUMBERS; )
            String socialString = ( "\nPlease enter a Social Security Number" );
            System.out.println (socialString);
            String socialInput = input.next ();
            try
                arrayStorage.validateSSN (socialInput);
                arrayStorage.addSocial (socialInput);
                socialNumber++;
            catch (InputMismatchException e)
                System.out.println ( "\nPlease reenter Social Security Number\n" + e.getMessage() );
            catch (DuplicateName e)
        System.out.printf ("\nHere are all your Social Security Numbers stored in our database:\n");
        System.out.printf ( "\n%8s%32s\n", "Database Index", "Social Security Numbers" );
        System.out.println (arrayStorage);
* SSNArrayExpanded.java
* Created on February 28, 2008, 9:52 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package exceptionhandling;
import java.util.InputMismatchException;
import org.omg.PortableInterceptor.ORBInitInfoPackage.DuplicateName;
* @author mer81348
public class SSNArrayExpanded extends SSNArray
    /** Creates a new instance of SSNArrayExpanded */
    public SSNArrayExpanded ()
    public SSNArrayExpanded ( String[] ssnArray, int socialNumber )
        super ( ssnArray, socialNumber );
    public void validateSSN ( String socialInput ) throws InputMismatchException, DuplicateName
        super.validateSSN (socialInput);
            int storedSocial = getSocialCount ();
            for (int socialMatch = 0; socialMatch < storedSocial; socialMatch++ )
                if (socialInput.equals (getSocialArray () [socialMatch]))
                    throw new DuplicateName ();
        return;
* SSNArrayTestExpanded.java
* Created on February 28, 2008, 9:53 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package exceptionhandling;
import java.util.InputMismatchException; // program uses class InputMismatchException
import java.util.Scanner; // program uses class Scanner
import org.omg.PortableInterceptor.ORBInitInfoPackage.DuplicateName;
* @author mer81348
public class SSNArrayTestExpanded
    /** Creates a new instance of SSNArrayTest */
    public SSNArrayTestExpanded ()
     * @param args the command line arguments
    public static void main (String[] args)
        // create Scanner to obtain input from command window
        Scanner input = new Scanner ( System.in );
        System.out.printf ( "\nWELCOME TO SOCIAL SECURITY NUMBER CONFIRMER\n" );
        SSNArrayExpanded arrayStorage = new SSNArrayExpanded(); 
        for( int socialNumber = 0; socialNumber < SSNArray.SOCIAL_SECURITY_NUMBERS; )
            String socialString = ( "\nPlease enter a Social Security Number" );
            System.out.println (socialString);
            String socialInput = input.next ();
            try
                arrayStorage.validateSSN (socialInput);
                arrayStorage.addSocial (socialInput);
                socialNumber++;
            catch (InputMismatchException e)
            catch (DuplicateName e)
                System.out.println ( "\nSocial Security Number is already claimed!\n" + "ERROR: " + e.getMessage() ); 
        System.out.printf ("\nHere are all your Social Security Numbers stored in our database:\n");
        System.out.printf ( "\n%8s%32s\n", "Database Index", "Social Security Numbers" );
        System.out.println (arrayStorage);
}

Answer 1

cotton.m wrote:
>
That writes creates the file but it doesn't store the social security numbers.True.Thanks for confirming that...
How do I get it to save?
Also, in the last post I had the write method commented out, the correct code is:
     System.out.printf ("\nHere are all your Social Security Numbers stored in our database:\n");
        System.out.printf ( "\n%8s%32s\n", "Database Index", "Social Security Numbers" );
        System.out.println ( arrayStorage );
        try
            File file = new File ("Social Security Numbers.java");
            // Create file if it does not exist
            boolean success = file.createNewFile ();
            if (success)
                  PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("Social Security Numbers.txt")));               
//                BufferedWriter out = new BufferedWriter (new FileWriter ("Social Security Numbers.txt")); 
                out.write( "what goes here ?" );
                out.close ();
                // File did not exist and was created
            else
                // File already exists
        catch (IOException e)
        System.exit (0);
}It still doesn't write.