Hello mizinnocent-ga,
As promised, I am delivering the source code for the GUI application
as you requested before your deadline time. Below is all the code -
you will need to place it all in a file called CarFrame.java, save it
in a new folder, and then compile it with the following command:
> javac CarFrame.java
The program also depends on a text file (the contents of which is also
listed below). Place this information in a file called carData.txt and
save it to the same folder where you saved your source code.
---------------BEGIN SOURCE CODE--------------------
// importing all required libraries
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
/*
The CarFrame class is an implementation of the JFrame and
also contains the main method. Usage:
> java CarFrame
Note that the file carData.txt must be in the same directory as
all compiled code.
*/
public class CarFrame extends JFrame
{
public static JTabbedPane index;
public static CarLot myCarLot;
public CarFrame()
{
// setting window properties
this.setSize(Toolkit.getDefaultToolkit().getScreenSize());
this.setDefaultCloseOperation(3);
this.setTitle("Car Park System");
this.setResizable(false);
Color newColor = new Color(0.2f, 0.1f, 0.8f, 0.1f);
// creating Car Lot object
myCarLot = new CarLot(15, "carData.txt");
// building tabbed panel display
index = new JTabbedPane();
index.setBackground(newColor);
final JPanel statusTab = Status.startup();
final JPanel addOrRemoveCarTab = AddOrRemoveCar.startup();
// adding tabs to tabbed panel
index.addTab("Lot Status", statusTab);
index.addTab("Add Or Remove Cars", addOrRemoveCarTab);
// setting content pane
this.getContentPane().add(index);
}
public static void main(String[] args)
{
// initialize frame and set visible
CarFrame main = new CarFrame();
main.setVisible(true);
}
}
class CarLot
{
// class variables
private Vector registeredDrivers;
private Vector parkingStalls;
private String dataFile;
private int maxLotSize;
// constructor
public CarLot(int maxSize, String fileName)
{
registeredDrivers = new Vector();
parkingStalls = new Vector();
maxLotSize = maxSize;
dataFile = fileName;
loadData();
}
public String getDataFileName()
{
return dataFile;
}
public int getMaxSize()
{
return maxLotSize;
}
public int carCount()
{
return parkingStalls.size();
}
// Input: license plate number
// Output: Stall number in parking lot
// Error State: returned String is ""
public String findStallLocation(String licenseNum)
{
String currentStall = "";
String returnVal = "";
for(int i = 0; i < parkingStalls.size(); i++)
{
currentStall = (String)parkingStalls.elementAt(i);
if(licenseNum.equals(currentStall))
{
returnVal = Integer.toString(i);
break;
}
}
return returnVal;
}
// Loads data from file (maintain persistence upon close)
public int loadData()
{
// each row in the data file represents a registered car
// format:
// licensePlateNum|currentlyParked
FileReader file;
BufferedReader buffer;
StringTokenizer tokens;
String currentLine = "";
String licensePlate = "";
String currentlyParked = "";
try
{
file = new FileReader(dataFile);
buffer = new BufferedReader(file);
// read and parse each line in the file
while((currentLine = buffer.readLine()) != null)
{
int returnVal = 0;
tokens = new StringTokenizer(currentLine, "|");
licensePlate = tokens.nextToken();
currentlyParked = tokens.nextToken();
// load all registered drivers
registeredDrivers.addElement(licensePlate);
// load car into stall if status is "Y"
if(currentlyParked.equals("Y"))
{
if(parkingStalls.size() < maxLotSize)
{
parkingStalls.addElement(licensePlate);
}
else
{
returnVal = -1;
}
}
}
}
catch(FileNotFoundException f)
{
return -1;
}
catch(IOException io)
{
return -1;
}
return 0;
}
// Saves status data upon request to data file
public int saveData()
{
FileWriter writer = null;
PrintWriter printer = null;
String currentRecord = "";
String licensePlate = "";
String parkedPlates = "";
String currentlyParked = "";
try
{
writer = new FileWriter(dataFile);
printer = new PrintWriter(writer);
// build data record by parsing Vectors
for(int i = 0; i < registeredDrivers.size(); i++)
{
licensePlate = (String)registeredDrivers.elementAt(i);
currentlyParked = "N";
for(int j = 0; j < parkingStalls.size(); j++)
{
parkedPlates = (String)parkingStalls.elementAt(j);
if(parkedPlates.equals(licensePlate))
{
currentlyParked = "Y";
break;
}
}
currentRecord = licensePlate + "|" + currentlyParked;
// output record to file
printer.println(currentRecord);
}
// close output streams
writer.close();
printer.close();
}
catch(IOException io)
{
return -1;
}
return 0;
}
public boolean carEnter(String licenseNum)
{
String parkedCar = "";
boolean alreadyHere = false;
// Check stalls to see if car is already parked
for(int i = 0; i < parkingStalls.size(); i++)
{
parkedCar = (String)parkingStalls.elementAt(i);
if(parkedCar.equals(licenseNum))
{
alreadyHere = true;
}
}
// car is not already parked
if(!alreadyHere)
{
// space is still available
if(!lotFull())
{
parkingStalls.addElement(licenseNum);
return true;
}
// space not available
else
{
return false;
}
}
// car already parked in lot
else
{
return false;
}
}
public boolean carExit(String licenseNum)
{
boolean returnVal = false; //default return value
String parkedCar = "";
// searching for car in stalls
for(int i = 0; i < parkingStalls.size(); i++)
{
parkedCar = (String)parkingStalls.elementAt(i);
// car found
if(parkedCar.equals(licenseNum))
{
parkingStalls.removeElementAt(i);
returnVal = true;
break;
}
}
return returnVal;
}
public boolean lotFull()
{
// compare stalls occupied to max lot size
if(parkingStalls.size() == maxLotSize)
{
return true;
}
else
{
return false;
}
}
}
/*
Provides the graphical layout for the Status tab
*/
class Status
{
public static JPanel statusTab = new JPanel();
public static JPanel statusScreen1;
static JTextField licensePlateField = new JTextField(20);
// retrieves Status panel and sets visible
static JPanel startup()
{
statusScreen1 = Status.getStatusScreen1();
statusTab.add(statusScreen1);
statusScreen1.setVisible(true);
return statusTab;
}
//defines and retrieves Status panel
static JPanel getStatusScreen1()
{
statusScreen1 = new JPanel(new FlowLayout());
JPanel generalPanel = new JPanel();
generalPanel.setLayout(new BoxLayout(generalPanel,
BoxLayout.Y_AXIS));
generalPanel.add(Box.createVerticalStrut(170));
JPanel holderPanel = new JPanel(new BorderLayout());
holderPanel.setLayout(new BoxLayout(holderPanel,
BoxLayout.Y_AXIS));
JPanel criteriaPanel = new JPanel();
criteriaPanel.setLayout(new BoxLayout(criteriaPanel,
BoxLayout.X_AXIS));
JLabel licensePlateLabel = new JLabel("License Plate Number:");
Font textFont = new Font("SanSerif", Font.PLAIN, 24);
Font textFieldFont = new Font("Serif", Font.PLAIN, 20);
licensePlateLabel.setFont(textFont);
licensePlateField.setFont(textFieldFont);
criteriaPanel.add(Box.createHorizontalStrut(40));
criteriaPanel.add(licensePlateLabel);
criteriaPanel.add(licensePlateField);
criteriaPanel.add(Box.createHorizontalStrut(40));
final JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new BoxLayout(buttonPanel,
BoxLayout.X_AXIS));
JButton lotCapacityButton = new JButton("Check Lot Capacity");
JButton saveStateButton = new JButton("Save Lot State");
JButton findStallButton = new JButton("Locate Vehicle");
JButton clearButton = new JButton(" Clear ");
lotCapacityButton.setFont(textFont);
saveStateButton.setFont(textFont);
findStallButton.setFont(textFont);
clearButton.setFont(textFont);
buttonPanel.add(Box.createHorizontalStrut(10));
buttonPanel.add(lotCapacityButton);
buttonPanel.add(saveStateButton);
buttonPanel.add(findStallButton);
buttonPanel.add(clearButton);
holderPanel.add(criteriaPanel);
holderPanel.add(Box.createVerticalStrut(30));
holderPanel.add(buttonPanel);
generalPanel.add(holderPanel);
statusScreen1.add(generalPanel);
statusScreen1.add(Box.createHorizontalStrut(150));
// button listener for lot capacity
lotCapacityButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// Retrieve required information
String licensePlate = licensePlateField.getText().trim();
int totalCapacity = CarFrame.myCarLot.getMaxSize();
int currentlyOccupied = CarFrame.myCarLot.carCount();
int freeSpace = totalCapacity - currentlyOccupied;
// Print dialog box
JOptionPane.showMessageDialog((Component) buttonPanel,
"Total Capacity: " + totalCapacity +
"\nCurrently Occupied: " + currentlyOccupied +
"\nFree Space: " + freeSpace,
"Current Car Lot Statistics",
JOptionPane.INFORMATION_MESSAGE);
// reset active tab and field data
CarFrame.index.setSelectedIndex(0);
licensePlateField.setText("");
}
});
// button listener for save state
saveStateButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// perform save operation
int result = CarFrame.myCarLot.saveData();
// check if successful and report results
if(result == 0)
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"Data for all registered users has been updated in file: " +
CarFrame.myCarLot.getDataFileName(),
"Data Stored Successfully", JOptionPane.INFORMATION_MESSAGE);
}
else
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"Data could not be stored!",
"Data Extract Failure", JOptionPane.ERROR_MESSAGE);
}
// reset active tab and field data
CarFrame.index.setSelectedIndex(0);
licensePlateField.setText("");
}
});
// button listener for car location search
findStallButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// retrieve input and perform search
String licensePlate = licensePlateField.getText().trim();
String stallNumber =
CarFrame.myCarLot.findStallLocation(licensePlate);
// check operation result and report using dialog boxes
if(!stallNumber.equals(""))
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"Location of car #" + licensePlate + ":" +
"\nStall " + stallNumber,
"Car Location Found",
JOptionPane.INFORMATION_MESSAGE);
}
else
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"Location of car #" + licensePlate + ":"
+ "Could not be found." +
"\nThe vehicle is either not registered or not currently
parked.",
"Car Location Found", JOptionPane.ERROR_MESSAGE);
}
// reset active tab and field data
CarFrame.index.setSelectedIndex(0);
licensePlateField.setText("");
}
});
// button listener for clear
clearButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{
// reset license plate field
licensePlateField.setText("");
}
});
return statusScreen1;
}
}
/*
Provides the graphical layout for the Add or Remove Car tab
*/
class AddOrRemoveCar
{
public static JPanel addOrRemoveCarTab = new JPanel();
public static JPanel addOrRemoveCarScreen1;
static JTextField licensePlateField = new JTextField(20);
// Retrieves and returns add/remove car panel
static JPanel startup()
{ addOrRemoveCarScreen1 =
AddOrRemoveCar.getAddOrRemoveCarScreen1();
addOrRemoveCarTab.add(addOrRemoveCarScreen1);
addOrRemoveCarScreen1.setVisible(true);
return addOrRemoveCarTab;
}
// Defines and returns graphical components for screen
static JPanel getAddOrRemoveCarScreen1()
{
addOrRemoveCarScreen1 = new JPanel(new FlowLayout());
JPanel generalPanel = new JPanel();
generalPanel.setLayout(new BoxLayout(generalPanel,
BoxLayout.Y_AXIS));
generalPanel.add(Box.createVerticalStrut(170));
JPanel holderPanel = new JPanel(new BorderLayout());
holderPanel.setLayout(new BoxLayout(holderPanel, BoxLayout.X_AXIS));
JPanel criteriaPanel = new JPanel(new FlowLayout());
JLabel licensePlateLabel = new JLabel("License Plate
Number:",
SwingConstants.RIGHT);
Font textFont = new Font("SanSerif", Font.PLAIN, 24);
Font textFieldFont = new Font("Serif", Font.PLAIN, 20);
licensePlateLabel.setFont(textFont);
licensePlateField.setFont(textFieldFont);
criteriaPanel.add(licensePlateLabel);
criteriaPanel.add(licensePlateField);
final JPanel buttonPanel = new JPanel(new FlowLayout());
buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.X_AXIS));
JButton addButton = new JButton("Add Car to Lot");
JButton removeButton = new JButton("Remove Car from Lot");
JButton clearButton = new JButton("Clear Data");
addButton.setFont(textFont);
removeButton.setFont(textFont);
clearButton.setFont(textFont);
buttonPanel.add(Box.createHorizontalStrut(10));
buttonPanel.add(addButton);
buttonPanel.add(removeButton);
buttonPanel.add(clearButton);
holderPanel.add(criteriaPanel);
generalPanel.add(holderPanel);
holderPanel.add(Box.createVerticalStrut(75));
generalPanel.add(buttonPanel);
addOrRemoveCarScreen1.add(generalPanel);
addOrRemoveCarScreen1.add(Box.createHorizontalStrut(100));
// button listener for adding car to lot
addButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String licensePlate = licensePlateField.getText().trim();
// check validity of input
if((licensePlate.length() == 0))
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"Please fill in the field and try again",
"Blank Field",
JOptionPane.ERROR_MESSAGE);
}
else
{
// perform enter operation
boolean result = CarFrame.myCarLot.carEnter(licensePlate);
// check outcome and report results
if(!result)
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"This license plate is either not registered or is already in the
lot. " +
"Please try again.",
"Invalid Operation", JOptionPane.ERROR_MESSAGE);
}
else
{
int another = JOptionPane.showConfirmDialog((Component)
buttonPanel, "The car has been added. Add another car to the lot?",
"Add Car",
JOptionPane.YES_NO_OPTION);
// reset input field
licensePlateField.setText("");
// change tabs based on user input
if(another == JOptionPane.NO_OPTION)
{
CarFrame.index.setSelectedIndex(0);
}
}
}
}
});
// button listener for removing car from lot
removeButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// retrieve input data
String licensePlate = licensePlateField.getText().trim();
// check data validity
if((licensePlate.length() == 0))
{
// invalid
JOptionPane.showMessageDialog((Component) buttonPanel,
"Please fill in the field and try again",
"Blank Field", JOptionPane.ERROR_MESSAGE);
}
else
{
// valid
// perform exit operation
boolean result = CarFrame.myCarLot.carExit(licensePlate);
// check outcome and report results
if(!result)
{
JOptionPane.showMessageDialog((Component) buttonPanel,
"This license plate is invalid or is already in the lot. Please try
again.",
"Invalid Operation", JOptionPane.ERROR_MESSAGE);
}
else
{
int another = JOptionPane.showConfirmDialog((Component)
buttonPanel, "The car has been removed. Remove another car?", "Add
Car",
JOptionPane.YES_NO_OPTION);
licensePlateField.setText("");
if(another == JOptionPane.NO_OPTION)
{
CarFrame.index.setSelectedIndex(0);
}
}
}
}
});
// button listener for clear button
clearButton.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e)
{
// reset text field
licensePlateField.setText("");
}
});
return addOrRemoveCarScreen1;
}
}
---------------END SOURCE CODE--------------------
---------------BEGIN DATA FILE--------------------
00000000|Y
11111111|N
22222222|Y
33333333|N
44444444|N
55555555|N
66666666|Y
77777777|N
88888888|Y
99999999|Y
10101010|N
11011011|Y
12012012|Y
13013013|N
14014014|Y
15015015|Y
16016016|N
17017017|N
18018018|Y
19019019|Y
---------------END DATA FILE--------------------
The content above (especially the source code) may have lines that are
broken as a result of being posted in this forum - something we have
to deal with. I have tried to write the code such that this is avoided
as much as possible :)
I have done my best to comment the code throughout so you shouldn't
have a problem following it, but let me know if you have a specific
concerns.
Cheers!
answerguru-ga |
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