import java.util.*;

/**
 * This class models a hotel reesrvation system
 *
 * @author Terence (adopted from Reservation)
 * @version 1.0.0
 */
public class NewReservation {

	/**
	 * occupancy is an array that indicates the occupant of each room.  
	 * If there are no occupants, it is marked null
	 */
	public static String[] occupancy;

	/* MAX_ROOMS is the maximum number of rooms.and also represent the array size */
	private int MAX_ROOMS = 5;

	/**
	 * Creates a list of rooms and make them available (by setting them to null).
	 */
	public NewReservation()  {

		/* creates the array of occupancy for the size of MAX_ROOMS */
		occupancy = new String[MAX_ROOMS];

		/* 
		 * The following is not necessary, since a newly constructed array
		 * will have null values by default. But we will set them to null
		 * for illustrative purposes.
		 */
		for (int index = 0; index < occupancy.length; index++)  {
			occupancy[index] = null;
		}
	}


	............the rest of the program
}

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

/**
 * This is GUI tester to test the hotel reservation class
 *
 * @author Terence (adopted from HotelReservation)
 * @version 1.0.0
 */
public class GUIReservationTester extends Applet
	implements ActionListener {

	private TextField input, output;
        private TextArea testOutput;
	private Button reserveButton , cancelButton ;

	private NewReservation reservation;

	/**
	 * Initializes widgets and creates layouts.
         *	
	 */
	public void init()  {
	
		reservation  = new NewReservation();

		input = new TextField(15);
		output = new TextField(30);
		testOutput = new TextArea(10,50);

		reserveButton  = new Button("Reserve");
		cancelButton  = new Button("Cancel");
	

		add(reserveButton );
		add(cancelButton );
		add(input);
		add(output);
                add(testOutput);
	
		reserveButton.addActionListener(this);
		cancelButton.addActionListener(this);
	}

	private void reserve(String customer)  {
	
		if (reservation.reserve (customer)) {
			output.setText("Reservation has been made for " + customer + ".");
		} else {
			output.setText ("The hotel is full.");
		}
		input.setText("");
	}

	private void cancel(String customer)  {

		if (reservation.cancel (customer)) {
			output.setText("Reservation has been canceled for " + customer + ".");
		} else {
			 output.setText (customer + " has no reservation at this hotel.");
		}
		input.setText("");
	}

	private void listOccupancy()  {
	
		String s = "";
		int size = reservation.occupancy.length;

                for (int i=0; i < size; i++) {
			s = s + reservation.occupancy[i] + '\n';
                }

		testOutput.setText(s);
	}

	/**
	 * Process the button events.
	 *
	 * @param e  the event generated.
	 */
	public void actionPerformed(ActionEvent evt)  {

		if (evt.getSource().equals(reserveButton ))  {
				reserve(input.getText());
			} else {
				cancel(input.getText());
			}

		listOccupancy();
		
	}
}