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problem with HardwareStore.java

2 replies on 1 page. Most recent reply: Apr 27, 2006 5:44 AM by Matthias Neumair

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Robert Wyatt

Posts: 2
Nickname: novice37
Registered: Apr, 2006

problem with HardwareStore.java

Posted: Apr 22, 2006 3:32 PM

I'm having trouble with HardwareStore.Java. I'm trying to add an additional column called total cost. There will be a total of five columns: record number, quantity, toolname, cost, and total cost. I'm posting the code below...any suggestions on getting this to work are greatly appreciated.

/*
* HardwareStore.java
* Program simulates hardware store inventory checking. import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;

public class HardwareStore extends JFrame {
private UpdateDialog updateDialog;
private NewDialog newDialog;
private DeleteDialog deleteDialog;
private InventoryDialog inventoryDialog;
private JMenuItem newItem, updateItem, deleteItem,
inventoryItem, exitItem;
private JDesktopPane desktop;
private RandomAccessFile file;
private Record records[];
private final int SIZE = 46;
private int recordSize;

public HardwareStore(int size)
{
super( "Hardware Store" );

recordSize = size;
records = new Record[ recordSize ];

// open file
try {
file = new RandomAccessFile( "hardware.dat", "rw" );

int numRecords = (int)(file.length()/SIZE);

if (numRecords == 0) {
// new file

for ( int i = 0; i < recordSize; i++ ) {
file.seek(i * SIZE);
records[ i ] = new Record();
records[ i ].write( file );
}
} else {
// existing fle

if (recordSize != numRecords)
System.out.println("Caution: Existing file has " +
numRecords + " records, which is different " +
"from the number: " + recordSize +
" that you entered. You can only create or " +
"update within the range of records that is the " +
"smaller of the two");
int minimum = Math.min(recordSize, numRecords);

for ( int i = 0; i < minimum; i++ ) {
file.seek(i * SIZE);
records[ i ] = new Record();
records[ i ].read(file);
}

if (recordSize > minimum)
// Increase the file size with blank records
for ( int i = minimum; i < recordSize; i++ ) {
file.seek(i * SIZE);
records[ i ] = new Record();
records[ i ].write( file );
}
}
}

catch ( IOException ioException ) {
System.err.println( ioException.toString() );
System.exit( 1 );
}

newDialog = new NewDialog( file, recordSize );
updateDialog = new UpdateDialog( file, recordSize );
deleteDialog = new DeleteDialog( file, recordSize );
inventoryDialog = new InventoryDialog( file, recordSize );

// set up GUI
Container container = getContentPane();
desktop = new JDesktopPane();
container.add( desktop );
desktop.add( newDialog );
desktop.add( updateDialog );
desktop.add( deleteDialog );
desktop.add( inventoryDialog );

JMenuBar menuBar = new JMenuBar();
setJMenuBar( menuBar );

JMenu fileMenu = new JMenu( "File" );
menuBar.add( fileMenu );

newItem = new JMenuItem( "New Record" );
newItem.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
newDialog.setVisible( true );
}

} // end anonymous inner class

); // end call to addActionListener

updateItem = new JMenuItem( "Update Record" );
updateItem.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
updateDialog.setVisible( true );
}

} // end anonymous inner class

); // end call to addActionListener

deleteItem = new JMenuItem( "Delete Record" );
deleteItem.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
deleteDialog.setVisible( true );
}

} // end anonymous inner class

); // end call to addActionListener

inventoryItem = new JMenuItem( "Show Inventory" );
inventoryItem.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
inventoryDialog.setVisible( true );
inventoryDialog.display();
}

} // end anonymous inner class

); // end call to addActionListener

exitItem = new JMenuItem( "Exit" );
exitItem.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
try {
file.close();
}

catch ( IOException ioException ) {
System.exit( 1 );
}

System.exit( 0 );
}

} // end anonymous inner class

); // end call to addActionListener

fileMenu.add( newItem );
fileMenu.add( updateItem );
fileMenu.add( deleteItem );
fileMenu.addSeparator();
fileMenu.add( inventoryItem );
fileMenu.addSeparator();
fileMenu.add( exitItem );

setDefaultCloseOperation( WindowConstants.DO_NOTHING_ON_CLOSE );

setSize( 370, 330 );
setVisible( true );

} // end constructor

public static void main( String args[] )
{
if (args.length != 1) {
System.out.println("Synopsis: java HardwareStore record_size");
System.exit(-1);
}
new HardwareStore(Integer.parseInt(args[0]));
}

} // end class HardwareStore

// class for updating records
class UpdateDialog extends JInternalFrame implements ActionListener{

// add declarations here

public UpdateDialog( RandomAccessFile updateFile, int size )
{
super( "Update Record" );

// add the body here

}

// process events
public void actionPerformed( ActionEvent event )
{
// add body here

} // end method actionPerformed

// clear text fields
private void clear()
{
// add body here
}

} // end class UpdateDialog

// class for creating new records
class NewDialog extends JInternalFrame implements ActionListener {

private RandomAccessFile file;
private JTextField recordField, toolField, quantityField, costField, totalcostField;
private JLabel recordLabel, toolLabel, quantityLabel, costLabel, totalcostLabel;
private JButton saveButton, cancelButton;
private Record data;
private int recordNumber;
private int recordSize;

public NewDialog( RandomAccessFile newFile, int size )
{
super( "New Record" );

recordSize = size;
file = newFile;
data = new Record();

// set up GUI
recordLabel = new JLabel( "Record Number" );
recordField= new JTextField( 10 );
toolLabel = new JLabel( "Tool Name" );
toolField = new JTextField( 10 );
quantityLabel = new JLabel( "Quantity" );
quantityField = new JTextField( 10 );
costLabel = new JLabel( "Cost" );
costField = new JTextField( 10 );
totalcostLabel = new JLabel ( "TotalCost");
totalcostField = new JTextField( 12);

saveButton = new JButton( "Save Changes" );
cancelButton = new JButton( "Cancel" );

saveButton.addActionListener( this );
cancelButton.addActionListener( this );

Container container = getContentPane();
container.setLayout( new GridLayout( 5, 2 ) );
container.add( recordLabel );
container.add( recordField );
container.add( toolLabel );
container.add( toolField );
container.add( quantityLabel );
container.add( quantityField );
container.add( costLabel );
container.add( costField );
container.add( totalcostLabel);
container.add( totalcostField);
container.add( saveButton );
container.add( cancelButton );

setSize( 300, 150 );
setVisible( false );
}

// process events
public void actionPerformed( ActionEvent event )
{
// save button
if ( event.getSource() == saveButton ) {

recordNumber = Integer.parseInt( recordField.getText() );

// check if record number is within range
if ( recordNumber < 1 || recordNumber > recordSize ) {
JOptionPane.showMessageDialog( this, "Invalid record number",
"Account Error", JOptionPane.ERROR_MESSAGE );
clear();
return;
}

// set file-pointer to appropriate location
try {
file.seek( ( recordNumber - 1 ) * data.SIZE );
data.read( file );
}

catch ( IOException ioException ) {
JOptionPane.showMessageDialog( this,
"Error while reading from file",
"Read Error", JOptionPane.ERROR_MESSAGE );
}

// record number already exists
if ( data.getRecordNumber() != 0 ) {
JOptionPane.showMessageDialog( this,
"Record number already exists",
"Duplicate record number", JOptionPane.ERROR_MESSAGE );
clear();
return;
}

// set values of new record and write to file
try {
data.setRecordNumber( recordNumber );
data.setToolName( toolField.getText() );
data.setQuantity(
Integer.parseInt( quantityField.getText() ) );
data.setCost( ( new Double(
costField.getText() ) ).doubleValue() );
file.seek( ( recordNumber - 1 ) * data.SIZE );
data.write( file );
}

catch ( IOException ioException ) {
JOptionPane.showMessageDialog( this,
"Error while writing to file",
"Write Error", JOptionPane.ERROR_MESSAGE );
return;
}

setVisible( false );
clear();
}

// cancel button
else if ( event.getSource() == cancelButton ) {
setVisible( false );
clear();
}

} // end method actionPerformed

// clear text fields
private void clear()
{
recordField.setText( "" );
toolField.setText( "" );
quantityField.setText( "" );
costField.setText( "" );
totalcostField.setText( "");
}

} // end class NewDialog

// class for deleting records
class DeleteDialog extends JInternalFrame implements ActionListener {

// add declarations here

public DeleteDialog( RandomAccessFile deleteFile, int size )
{
super( "Delete Record" );

// add body here
}

// process events
public void actionPerformed( ActionEvent event )
{
// add body here

} // end method actionPerformed

} // end class DeleteDialog

// class for displaying records
class InventoryDialog extends JInternalFrame {

private RandomAccessFile file;
private JTextArea displayArea;
private JButton closeButton;
private JScrollPane scroller;
private Record data;
private int recordSize;

public InventoryDialog( RandomAccessFile deleteFile, int size )
{
super( "Inventory" );

recordSize = size;
file = deleteFile;
data = new Record();

displayArea = new JTextArea( 300, 200 );
displayArea.setEditable( false );
scroller = new JScrollPane( displayArea );

closeButton = new JButton( "Close" );
closeButton.addActionListener(

new ActionListener() { // anonymous inner class

public void actionPerformed( ActionEvent event )
{
setVisible( false );
}

} // end anonymous inner class

); // end call to addActionListener

Container container = getContentPane();
container.setLayout( new BorderLayout() );
container.add( scroller, BorderLayout.CENTER );
container.add( closeButton, BorderLayout.SOUTH );

setSize( 350, 275 );
setVisible( false );
}

// display tool inventory
public void display()
{
displayArea.setText( "Record #\tTool Name\tQuantity\tCost\tTotalCost\n" );

try {
for ( int i = 0; i < recordSize; i++ ) {

file.seek( ( i ) * data.SIZE );
data.read( file );

if ( data.getRecordNumber() != 0 )
displayArea.append( data.getRecordNumber() + "\t" +
data.getToolName() + "\t" + data.getQuantity() + "\t" +
data.getCost() + "\t" + data.getTotalCost() + "\n" );
}
}

// error reading from file
catch ( IOException ioException ) {
JOptionPane.showMessageDialog( this,
"Error during read from file",
"Read Error", JOptionPane.ERROR_MESSAGE );
}
}

} // end class InventoryDialog

Robert Wyatt

Posts: 2
Nickname: novice37
Registered: Apr, 2006

Re: problem with HardwareStore.java

Posted: Apr 26, 2006 1:11 PM

thanks for all the help and suggestions

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: problem with HardwareStore.java

Posted: Apr 27, 2006 5:44 AM

You didn't even format your post.
You really expect someone to read this?

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