Helo, there are 3 files, CustomerClient.java, CustomerServer.java and Customer.java
PROBLEM: In the CustomerServer.java file, i get an error when I compile the CustomerServer.java at line :  System.out.println(a[k].getName());
ERROR: 
init:
deps-jar:
Compiling 1 source file to C:\Documents and Settings\TLNA\My Documents\NetBeansProjects\Server\build\classes
C:\Documents and Settings\TLNA\My Documents\NetBeansProjects\Server\src\CustomerServer.java:44: cannot find symbol
symbol  : method getName()
location: class Customer
                    System.out.println(a[k].getName());
1 error
BUILD FAILED (total time: 0 seconds)
CustomerClient.java
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class CustomerClient extends JApplet {
private JTextField jtfName = new JTextField(32);
private JTextField jtfSeatNo = new JTextField(32);
// Button for sending a student to the server
private JButton jbtRegister = new JButton("Register to the Server");
// Indicate if it runs as application
private boolean isStandAlone = false;
// Host name or ip
String host = "localhost";
public void init() {
    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(2, 1));
    p1.add(new JLabel("Name"));
    p1.add(jtfName);
    p1.add(new JLabel("Seat No."));
    p1.add(jtfSeatNo);
    add(p1, BorderLayout.CENTER);
    add(jbtRegister, BorderLayout.SOUTH);
    // Register listener
    jbtRegister.addActionListener(new ButtonListener());
    // Find the IP address of the Web server
    if (!isStandAlone) {
        host = getCodeBase().getHost();
    }
}
/** Handle button action */
private class ButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        try {
            // Establish connection with the server
            Socket socket = new Socket(host, 8000);
            // Create an output stream to the server
            ObjectOutputStream toServer =
                    new ObjectOutputStream(socket.getOutputStream());
            // Get text field
            String name = jtfName.getText().trim();
            String seatNo = jtfSeatNo.getText().trim();
            // Create a Student object and send to the server
            Customer s = new Customer(name, seatNo);
            toServer.writeObject(s);
        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}
/** Run the applet as an application */
public static void main(String[] args) {
    // Create a frame
    JFrame frame = new JFrame("Register Student Client");
    // Create an instance of the applet
    CustomerClient applet = new CustomerClient();
    applet.isStandAlone = true;
    // Get host
    if (args.length == 1) {
        applet.host = args[0];
    // Add the applet instance to the frame
    }
    frame.add(applet, BorderLayout.CENTER);
    // Invoke init() and start()
    applet.init();
    applet.start();
    // Display the frame
    frame.pack();
    frame.setVisible(true);
}
} 
CustomerServer.java
import java.io.*;
import java.net.*;
public class CustomerServer {
private String name;
private int i;
private ObjectOutputStream outputToFile;
private ObjectInputStream inputFromClient;
public static void main(String[] args) {
    new CustomerServer();
}
public CustomerServer() {
    Customer[] a = new Customer[30];
    try {
        // Create a server socket
        ServerSocket serverSocket = new ServerSocket(8000);
        System.out.println("Server started ");
        // Create an object ouput stream
        outputToFile = new ObjectOutputStream(
                new FileOutputStream("student.dat", true));
        while (true) {
            // Listen for a new connection request
            Socket socket = serverSocket.accept();
            // Create an input stream from the socket
            inputFromClient =
                    new ObjectInputStream(socket.getInputStream());
            // Read from input
            //Object object = inputFromClient.readObject();
            for (int k = 0; k <= 2; k++) {
                if (a[k] == null) {
                    a[k] = (Customer) inputFromClient.readObject();
                    // Write to the file
                    outputToFile.writeObject(a[k]);
                    //System.out.println("A new student object is stored");
                    System.out.println(a[k].getName());
                    break;
                }
                if (k == 2) {
                    //fully booked
                    outputToFile.writeObject("All seats are booked");
                    break;
                }
            }
        }
    } catch (ClassNotFoundException ex) {
        ex.printStackTrace();
    } catch (IOException ex) {
        ex.printStackTrace();
    } finally {
        try {
            inputFromClient.close();
            outputToFile.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}
}
Customer.java
public class Customer implements java.io.Serializable {
private String name;
private String seatno;
public Customer(String name, String seatno) {
    this.name = name;
    this.seatno = seatno;
}
public String getName() {
    return name;
}
public String getSeatNo() {
    return seatno;
}
}