import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class StudentServerInterfaceClient extends JApplet {
  // Declare a Student instance
  private StudentServerInterface student;

  private boolean isStandalone; // Is applet or application

  private JButton jbtGetScore = new JButton("Get Score");
  private JTextField jtfName = new JTextField();
  private JTextField jtfScore = new JTextField();

  public void init() {
    // Initialize RMI
    initializeRMI();

    JPanel jPanel1 = new JPanel();
    jPanel1.setLayout(new GridLayout(2, 2));
    jPanel1.add(new JLabel("Name"));
    jPanel1.add(jtfName);
    jPanel1.add(new JLabel("Score"));
    jPanel1.add(jtfScore);

    add(jbtGetScore, BorderLayout.SOUTH);
    add(jPanel1, BorderLayout.CENTER);

    jbtGetScore.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
        getScore();
      }
    });
  }

  private void getScore() {
    try {
      // Get student score
      double score = student.findScore(jtfName.getText().trim());

      // Display the result
      if (score < 0)
        jtfScore.setText("Not found");
      else
        jtfScore.setText(new Double(score).toString());
    }
    catch(Exception ex) {
      ex.printStackTrace();
    }
  }

  /** Initialize RMI */
  protected void initializeRMI() {
    String host = "";
    if (!isStandalone) host = getCodeBase().getHost();

    try {
      Registry registry = LocateRegistry.getRegistry(host);
      student = (StudentServerInterface)
        registry.lookup("StudentServerInterfaceImpl");
      System.out.println("Server object " + student + " found");
    }
    catch(Exception ex) {
      System.out.println(ex);
    }
  }

  /** Main method */
  public static void main(String[] args) {
    StudentServerInterfaceClient applet =
      new StudentServerInterfaceClient();
    applet.isStandalone = true;
    JFrame frame = new JFrame();
    frame.setTitle("StudentServerInterfaceClient");
    frame.add(applet, BorderLayout.CENTER);
    frame.setSize(250, 150);
    applet.init();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(3);
  }
}