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

public class ReadSequentialFile {
	private ObjectInputStream input;

	// enable user to select file to open
	public void openFile() {
		try { // open file
			input = new ObjectInputStream(new FileInputStream( "clients.ser" ));
		} 
		catch ( IOException ioException ){
			System.err.println( "Error opening file." );
		} 
	} 

	// read record from file
	public void readRecords() {
		AccountRecord record;
		System.out.printf( "%-10s%-12s%-12s%10s\n", "Account", "First Name", "Last Name", "Balance" );

		try { // input the values from the file
			while (true) {
				record = ( AccountRecord ) input.readObject();

				// display record contents
				System.out.printf( "%-10d%-12s%-12s%10.2f\n",
						record.getAccount(), record.getFirstName(),
						record.getLastName(), record.getBalance() );
			} 
		} 
		catch ( EOFException endOfFileException ) {
			return; // end of file was reached
		} 
		catch ( ClassNotFoundException classNotFoundException ) {
			System.err.println( "Unable to create object." );
		} 
		catch ( IOException ioException ) {
			System.err.println("Error during reading from file.");
		} 
	} 

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