Create and Read Sequential File, I cant Find where Is my mistakes.

[mgd00tz]

import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;


public class ReadSequentialFile {

    private ObjectInputStream input;

    public void openFile()  {
        try {
            input = new ObjectInputStream(
                    new FileInputStream("clients.ser"));

        } catch (IOException ioException) {
            System.err.println("Error opening File");
        }
    }

    public void readRecords()  {
        AccountRecordSerializable record;
        System.out.printf("%-10s%-12s%-12s%10s%\n","Account", "FirstName", "LastName", "Balance");
        try {
            while (true) {
                record = (AccountRecordSerializable) input.readObject();
                System.out.printf("%-10s%-12s%-12s%10.2f\n",
                        record.getAccount(), record.getFirstname(),
                        record.getLastname(), record.getBalance());

            }
        } catch (EOFException endOfFileException) {
            return;
        } catch (ClassNotFoundException classNotFoundException) {
            System.err.println("Unable to create object");
        } catch (IOException ioException) {
            System.err.println("Error during reading from File.");
        }
    }

    public void closeFile()  {
        try {
            if (input != null) {
                input.close();
            }
            System.exit(0);
        } catch (IOException ioException) {
            System.err.println("Error closing File.");
            System.exit(1);
        }

    }
}
//the main class of Read Sequential file
public class ReadSequentialFileTest {

    public static void main(String[] args) {

        ReadSequentialFile apps = new ReadSequentialFile();
        apps.openFile();
        apps.readRecords();
        apps.closeFile();
    }
}


import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Scanner;


public class CreateSequentialFile {

    private ObjectOutputStream output;

    public void OpenFile()   {
        try {
            output = new ObjectOutputStream(new FileOutputStream("client.ser"));
        } catch (IOException ex) {
            ex.printStackTrace();


        }

    }

    public void addrecords() {

        AccountRecordSerializable record;
        int accountNumber = 0;
        String firstName;
        String lastName;
        double balance;
        Scanner input = new Scanner(System.in);
        System.out.printf("%s\n%s", "Enter account number (>0), firstname, lastname, balance", "?");
        while (input.hasNext()) {
            accountNumber = input.nextInt();
            firstName = input.next();
            lastName = input.next();
            balance = input.nextDouble();
            if (accountNumber > 0) {
                record = new AccountRecordSerializable(accountNumber, firstName, lastName, balance);
                try {
                    output.writeObject(record);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }

            } else {
                System.out.println("accountNumber>0");
            }

        }
        System.out.printf("%s\n%s", "Enter account number (>0), firstname, lastname, balance", "?");
    }

    public void closeFile() {
        if (output != null) {
            try {
                output.close();

            } catch (IOException ex) {
            }
        }
    }
}

// the main class of Create Sequential file
import java.io.IOException;



public class CreateSequentialFileTest {


    public static void main(String[] args)  {
        CreateSequentialFile application = new CreateSequentialFile ();
        application.OpenFile();
        application.addrecords();
        application.closeFile();

    }

}

Hello guys, Can you please help me fix this codes??
I cant find where is my mistakes.
Thank you guys..

[NormR1]

Please use code tags when posting your code.

Please copy full text of error message and paste it here. Here is a sample:

TestSorts.java:138: cannot find symbol
symbol : variable var
location: class TestSorts
var = 2;
^

[mgd00tz]

here is the error...
Error opening File
Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '
'
at java.util.Formatter.checkText(Formatter.java:2502)
at java.util.Formatter.parse(Formatter.java:2484)
at java.util.Formatter.format(Formatter.java:2413)
at java.io.PrintStream.format(PrintStream.java:920)
at java.io.PrintStream.printf(PrintStream.java:821)
at ReadSequentialFile.readRecords(ReadSequentialFile.java:31)
at ReadSequentialFileTest.main(ReadSequentialFileTest.java:19)
Java Result: 1

I checked it already but I cant Understand what is the error..

[NormR1]

On line 31 your code calls the printf() method.
Double check the the args passed to printf() on that line.
Or post that line here.