import java.io.EOFException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class ReadRandomFile {
	private RandomAccessFile input;

	// enable user to select file to open
	public void openFile() {
		try { // open file
			input = new RandomAccessFile( "clients.dat", "r" );
      	} 
		catch ( IOException ioException ) {
			System.err.println( "File does not exist." );
		} 
	} 
   
	// read and display records
	public void readRecords() {
		AccountRecord record = new AccountRecord();

		System.out.printf( "%-10s%-15s%-15s%10s\n", "Account",
         "First Name", "Last Name", "Balance" );

		try { // read a record and display
			while (true) {
				do {
					record.read( input );
				} while (record.getAccount() == 0);

				// display record contents
				System.out.printf( "%-10d%-12s%-12s%10.2f\n",
						record.getAccount(), record.getFirstName(),
						record.getLastName(), record.getBalance() );
			} 
		} 
		catch ( EOFException eofException ) { // close file
			return; // end of file was reached
		}
		catch (IOException ioException) {
			System.err.println( "Error reading file." );
			System.exit(1);
		} 
	}
   
	// close file and terminate application
   	public void closeFile() {
   		try { // close file and exit
   			if (input != null)
   				input.close();
   		} 
   		catch ( IOException ioException ) {
   			System.err.println( "Error closing file." );
   			System.exit(1);
   		} 
   	} 
}