import  java.util.*;
import  java.io.*;
import java.text.DecimalFormat;


public class PayrollDB extends Vector {

  public String  toString() {

    String st = "";
    DecimalFormat precision2 = new DecimalFormat( "0.00" );

    for (int i = 0; i < size(); i++) {
	st += ((Employee) get(i)).toString() + " earned $" +
        precision2.format( ((Employee) get(i)).earnings() ) + '\n';   
    }

    return st;
  }

  public void  load(BufferedReader  br, final String  DELIM) throws IOException {

    String inputLine;
    while((inputLine = br.readLine()) != null) {
      StringTokenizer  st = new  StringTokenizer(inputLine, DELIM);
      Employee employee;
      char symbol = st.nextToken().charAt(0);
      switch (symbol) {
        case 'B':  employee = new Boss( st.nextToken(), 
                                 st.nextToken(),
                                 Double.parseDouble(st.nextToken()));
                   add(employee);
                   break;
        case 'C':  employee = new CommissionWorker( st.nextToken(), 
                                 st.nextToken(),
                                 Double.parseDouble(st.nextToken()),
                                 Double.parseDouble(st.nextToken()),
                                 Integer.parseInt(st.nextToken()));
                   add(employee);
                   break;
        case 'P':  employee = new PieceWorker( st.nextToken(), 
                                 st.nextToken(),
                                 Double.parseDouble(st.nextToken()),
                                 Integer.parseInt(st.nextToken()));
                   add(employee);
                   break;
        case 'H':  employee = new HourlyWorker( st.nextToken(), 
                                 st.nextToken(),
                                 Double.parseDouble(st.nextToken()),
                                 Double.parseDouble(st.nextToken()));
                   add(employee);
                   break;
      }
    }
  }
}

import java.awt.*;
import java.applet.*;
import java.util.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class PayrollDBApplet extends Applet 
                           implements ActionListener,
				      ItemListener { 

  PayrollDB payrollDB;
  Choice employeeList;
  TextArea payReport;
  TextField employeeReport;
  Button bGenReport, bClearReport;

  public void init() {

    payrollDB = new PayrollDB();

    employeeList = new Choice();
    employeeReport = new TextField(50);
    payReport = new TextArea(10,50);

    bGenReport = new Button("Generate Report");
    bClearReport = new Button("Clear Report");

      try {
        URL address = new URL("http://personal.cityu.edu.hk/~dcywchan/2002ssd3/datafile.html");
        URLConnection data = address.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(data.getInputStream()));

        payrollDB.load(in,"_");

        for (int i = 0; i < payrollDB.size(); i++) {
	   employeeList.add( ((Employee) payrollDB.get(i)).toString()); 
        }

	add(employeeList);
        add(employeeReport);
        add(payReport);

        add(bGenReport);
        add(bClearReport);

        bGenReport.addActionListener(this);
        bClearReport.addActionListener(this);

        employeeList.addItemListener(this);

        in.close();

      } catch (MalformedURLException e) {
      } catch (IOException e) {
      }
  }

  public void actionPerformed(ActionEvent e) {

    if (e.getSource().equals(bGenReport)) {
       payReport.setText(payrollDB.toString());     
    }
    else if (e.getSource().equals(bClearReport)) {
            payReport.setText("");     
         }
  }

  public void itemStateChanged(ItemEvent ie) {

    StringTokenizer  st = new  StringTokenizer(employeeList.getSelectedItem(),":");
    String name = st.nextToken();

    name = st.nextToken();

    int i = 0;
    while (! name.equals( " " + ((Employee) payrollDB.get(i)).getFirstName() + " " +
                           ((Employee) payrollDB.get(i)).getLastName() ) ) {
        i++;
    }
 
    employeeReport.setText( ((Employee) payrollDB.get(i)).toString() + " earned $" +
                            ((Employee) payrollDB.get(i)).earnings() );
  }
}