Writing to Muliple Parts of a File

Writing a large scale application that involves several threads that read different parts of a file, correct their respective part, and recreate the file.
Is it possible for each of the threads to write to different parts of the same file simultaneously?
Speed is an issue here so any tips would be helpful thanks.

spacecadet,
Succinctly. No.
Use separate physical files for each working portion of the table. It's called striping. Google it.
Any other brilliant ideas?

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Problem with ArrayLists and writing and reading from a .dat file (I think)

I'm brand new to this forum, but I'm sure hoping someone can help me with a problem I'm having with ArrayLists. This program was originally created with an array of objects that were displayed on a GUI with jtextFields, then cycling thru them via jButtons: First, Next, Previous, Last. Now I need to add the ability to modify, delete and add records. Both iterations of this program needed to write to and read from a .dat file.
It worked just like it was suppose to when I used just the array, but now I need to use a "dynamic array" that will grow or shrink as needed: i.e. an ArrayList.
When I aded the ArrayList I had the ArrayList use toArray() to fill my original array so I could continue to use all the methods I'd created for using with my array. Now I'm getting a nullPointerException every time I try to run my program, which means somewhere I'm NOT filling my array ???? But, I'm writing just fine to my .dat file, which is confusing me to no end!
It's a long program, and I apologize for the length, but here it is. There are also 2 class files, a parent and 1 child below Inventory6. This was written in NetBeans IDE 5.5.1.
Thank you in advance for any help anyone can give me!
LabyBC
package my.Inventory6;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.io.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.lang.IllegalStateException;
import java.util.NoSuchElementException;
import java.util.ArrayList;
import java.text.NumberFormat;
// Class Inventory6
public class Inventory6 extends javax.swing.JFrame {
private static InventoryPlusColor[] inventory;
private static ArrayList inList;
// create a tool that insure the specified format for a double number, when displayed
private DecimalFormat doubleFormat = new DecimalFormat( "0.00" );
private DecimalFormat singleFormat = new DecimalFormat( "0");
// the index within the array of products of the current displayed product
private int currentProductIndex;
/** Creates new form Inventory6 */
public Inventory6() {
initComponents();
currentProductIndex = 0;
} // end Inventory6()
private static InventoryPlusColor[] getInventory() {
ArrayList<InventoryPlusColor> inList = new ArrayList<InventoryPlusColor>();
inList.add(new InventoryPlusColor(1, "Couch", 3, 1250.00, "Blue"));
inList.add(new InventoryPlusColor(2, "Recliner", 10, 525.00, "Green"));
inList.add(new InventoryPlusColor(3, "Chair", 6, 125.00, "Mahogany"));
inList.add(new InventoryPlusColor(4, "Pedestal Table", 2, 4598.00, "Oak"));
inList.add(new InventoryPlusColor(5, "Sleeper Sofa", 4, 850.00, "Yellow"));
inList.add(new InventoryPlusColor(6, "Rocking Chair", 2, 459.00, "Tweed"));
inList.add(new InventoryPlusColor(7, "Couch", 4, 990.00, "Red"));
inList.add(new InventoryPlusColor(8, "Chair", 12, 54.00, "Pine"));
inList.add(new InventoryPlusColor(9, "Ottoman", 3, 110.00, "Black"));
inList.add(new InventoryPlusColor(10, "Chest of Drawers", 5, 598.00, "White"));
for (int j = 0; j < inList.size(); j++)
System.out.println(inList);
InventoryPlusColor[] inventory = (InventoryPlusColor[]) inList.toArray
(new InventoryPlusColor[inList.size()]);
return inventory;
} // end getInventory() method
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
IDNumberLbl = new javax.swing.JLabel();
IDNumberField = new javax.swing.JTextField();
prodNameLbl = new javax.swing.JLabel();
prodNameField = new javax.swing.JTextField();
colorLbl = new javax.swing.JLabel();
colorField = new javax.swing.JTextField();
unitsInStockLbl = new javax.swing.JLabel();
unitsInStockField = new javax.swing.JTextField();
unitPriceLbl = new javax.swing.JLabel();
unitPriceField = new javax.swing.JTextField();
invenValueLbl = new javax.swing.JLabel();
invenValueField = new javax.swing.JTextField();
restockingFeeLbl = new javax.swing.JLabel();
restockingFeeField = new javax.swing.JTextField();
jbtFirst = new javax.swing.JButton();
jbtNext = new javax.swing.JButton();
jbtPrevious = new javax.swing.JButton();
jbtLast = new javax.swing.JButton();
jbtAdd = new javax.swing.JButton();
jbtDelete = new javax.swing.JButton();
jbtModify = new javax.swing.JButton();
jbtSave = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
searchIDNumLbl = new javax.swing.JLabel();
searchIDNumbField = new javax.swing.JTextField();
jbtSearch = new javax.swing.JButton();
searchResults = new javax.swing.JLabel();
jbtExit = new javax.swing.JButton();
jbtExitwoSave = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(), "Inventory Program"));
IDNumberLbl.setText("ID Number");
IDNumberField.setEditable(false);
prodNameLbl.setText("Product Name");
prodNameField.setEditable(false);
colorLbl.setText("Product Color");
colorField.setEditable(false);
colorField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
colorFieldActionPerformed(evt);
unitsInStockLbl.setText("Units In Stock");
unitsInStockField.setEditable(false);
unitPriceLbl.setText("Unit Price $");
unitPriceField.setEditable(false);
invenValueLbl.setText("Inventory Value $");
invenValueField.setEditable(false);
restockingFeeLbl.setText("5% Restocking Fee $");
restockingFeeField.setEditable(false);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(unitPriceLbl)
.addComponent(unitsInStockLbl)
.addComponent(colorLbl)
.addComponent(prodNameLbl)
.addComponent(IDNumberLbl)
.addComponent(restockingFeeLbl)
.addComponent(invenValueLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(IDNumberField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(prodNameField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(colorField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(unitsInStockField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(unitPriceField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(restockingFeeField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(invenValueField, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE))
.addContainerGap())
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(IDNumberLbl)
.addComponent(IDNumberField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(prodNameLbl)
.addComponent(prodNameField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(colorField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(colorLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(unitsInStockField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(unitsInStockLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(unitPriceField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(unitPriceLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(restockingFeeField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(restockingFeeLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 10, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(invenValueField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(invenValueLbl))
.addContainerGap())
jbtFirst.setText("First");
jbtFirst.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtFirstActionPerformed(evt);
jbtNext.setText("Next");
jbtNext.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtNextActionPerformed(evt);
jbtPrevious.setText("Previous");
jbtPrevious.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtPreviousActionPerformed(evt);
jbtLast.setText("Last");
jbtLast.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtLastActionPerformed(evt);
jbtAdd.setText("Add");
jbtAdd.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtAddActionPerformed(evt);
jbtDelete.setText("Delete");
jbtModify.setText("Modify");
jbtModify.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtModifyActionPerformed(evt);
jbtSave.setText("Save");
jbtSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtSaveActionPerformed(evt);
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(), "Search by:"));
searchIDNumLbl.setText("Item Number:");
jbtSearch.setText("Search");
searchResults.setFont(new java.awt.Font("Tahoma", 1, 12));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(searchIDNumLbl)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(259, 259, 259)
.addComponent(searchResults, javax.swing.GroupLayout.PREFERRED_SIZE, 213, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jbtSearch, javax.swing.GroupLayout.PREFERRED_SIZE, 83, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(searchIDNumbField, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(searchIDNumLbl)
.addComponent(searchIDNumbField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(32, 32, 32)
.addComponent(searchResults, javax.swing.GroupLayout.PREFERRED_SIZE, 17, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtSearch)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
jbtExit.setText("Save and Exit");
jbtExit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtExitActionPerformed(evt);
jbtExitwoSave.setText("Exit");
jbtExitwoSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtExitwoSaveActionPerformed(evt);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 44, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jbtExitwoSave, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jbtExit)))
.addGroup(layout.createSequentialGroup()
.addComponent(jbtFirst)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtNext)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtPrevious)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtLast))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(12, 12, 12)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jbtAdd)
.addComponent(jbtDelete)
.addComponent(jbtModify)
.addComponent(jbtSave))))
.addContainerGap())
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jbtFirst, jbtLast, jbtNext, jbtPrevious});
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jbtAdd, jbtDelete, jbtModify, jbtSave});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(21, 21, 21)
.addComponent(jbtAdd)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtDelete)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtModify)
.addGap(39, 39, 39)
.addComponent(jbtSave))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbtFirst)
.addComponent(jbtNext)
.addComponent(jbtPrevious)
.addComponent(jbtLast))
.addGap(15, 15, 15)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(jbtExit)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtExitwoSave)))
.addContainerGap())
pack();
}// </editor-fold>
private void jbtExitwoSaveActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
private void jbtSaveActionPerformed(java.awt.event.ActionEvent evt) {
String prodNameMod, colorMod;
double unitsInStockMod, unitPriceMod;
int idNumMod;
idNumMod = Integer.parseInt(IDNumberField.getText());
prodNameMod = prodNameField.getText();
unitsInStockMod = Double.parseDouble(unitsInStockField.getText());
unitPriceMod = Double.parseDouble(unitPriceField.getText());
colorMod = colorField.getText();
if(currentProductIndex == inventory.length) {
inList.add(new InventoryPlusColor(idNumMod, prodNameMod,
unitsInStockMod, unitPriceMod, colorMod));
InventoryPlusColor[] inventory = (InventoryPlusColor[]) inList.toArray
(new InventoryPlusColor[inList.size()]);
} else {
inventory[currentProductIndex].setIDNumber(idNumMod);
inventory[currentProductIndex].setProdName(prodNameMod);
inventory[currentProductIndex].setUnitsInStock(unitsInStockMod);
inventory[currentProductIndex].setUnitPrice(unitPriceMod);
inventory[currentProductIndex].setColor(colorMod);
displayProduct(inventory[currentProductIndex]);
private static void writeInventory(InventoryPlusColor i,
DataOutputStream out) {
try {
out.writeInt(i.getIDNumber());
out.writeUTF(i.getProdName());
out.writeDouble(i.getUnitsInStock());
out.writeDouble(i.getUnitPrice());
out.writeUTF(i.getColor());
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception writing data",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} //end writeInventory()
private static DataOutputStream openOutputStream(String name) {
DataOutputStream out = null;
try {
File file = new File(name);
out =
new DataOutputStream(
new BufferedOutputStream(
new FileOutputStream(file)));
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Error", "", JOptionPane.ERROR_MESSAGE);
System.exit(0);
return out;
} // end openOutputStream()
private static void closeFile(DataOutputStream out) {
try {
out.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception closing file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end closeFile()
private static DataInputStream getStream(String name) {
DataInputStream in = null;
try {
File file = new File(name);
in = new DataInputStream(
new BufferedInputStream(
new FileInputStream(file)));
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(null, "The file doesn't exist",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Error creating file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
return in;
private static void closeInputFile(DataInputStream in) {
try {
in.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception closing file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end closeInputFile()
private double entireInventory() {
// a temporary double variable that the method will return ...
// after each product's inventory is added to it
double entireInventory = 0;
// loop to control number of products
for (int index = 0; index < inventory.length; index++) {
// add each inventory to the entire inventory
entireInventory += inventory[index].setInventoryValue();
} // end loop to control number of products
return entireInventory;
} // end method entireInventory
private void jbtLastActionPerformed(java.awt.event.ActionEvent evt) {
currentProductIndex = inventory.length-1; // move to the last product
// display the information for the last product
displayProduct(inventory[currentProductIndex]);
private void jbtPreviousActionPerformed(java.awt.event.ActionEvent evt) {
if (currentProductIndex != 0) // it's not the first product displayed
currentProductIndex -- ; // move to the previous product (decrement the current index)
} else // the first product is displayed
currentProductIndex = inventory.length-1; // move to the last product
// after the current product index is set, display the information for that product
displayProduct(inventory[currentProductIndex]);
private void jbtNextActionPerformed(java.awt.event.ActionEvent evt) {
if (currentProductIndex != inventory.length-1) // it's not the last product displayed
currentProductIndex ++ ; // move to the next product (increment the current index)
} else // the last product is displayed
currentProductIndex = 0; // move to the first product
// after the current product index is set, display the information for that product
displayProduct(inventory[currentProductIndex]);
private void jbtFirstActionPerformed(java.awt.event.ActionEvent evt) {
currentProductIndex = 0;
// display the information for the first product
displayProduct(inventory[currentProductIndex]);
private void colorFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
private void jbtModifyActionPerformed(java.awt.event.ActionEvent evt) {
prodNameField.setEditable(true);
prodNameField.setFocusable(true);
unitsInStockField.setEditable(true);
unitPriceField.setEditable(true);
private void jbtAddActionPerformed(java.awt.event.ActionEvent evt) {
IDNumberField.setText("");
IDNumberField.setEditable(true);
prodNameField.setText("");
prodNameField.setEditable(true);
colorField.setText("");
colorField.setEditable(true);
unitsInStockField.setText("");
unitsInStockField.setEditable(true);
unitPriceField.setText("");
unitPriceField.setEditable(true);
restockingFeeField.setText("");
invenValueField.setText("");
currentProductIndex = inventory.length;
private void jbtExitActionPerformed(java.awt.event.ActionEvent evt) {
DataOutputStream out = openOutputStream("inventory.dat");
for (InventoryPlusColor i : inventory)
writeInventory(i, out);
closeFile(out);
System.exit(0);
private static InventoryPlusColor readProduct(DataInputStream in) {
int idNum = 0;
String prodName = "";
double inStock = 0.0;
double pric

BalusC -- The line that gives me my NullPointerException is when I call the "DisplayProduct()" method. Its a dumb question, but with NetBeans how do I find out which reference could be null? I'm not very familiar with how NetBeans works with finding out how to debug. Any help you can give me would be greatly appreciated.The IDE is com-plete-ly irrelevant. It's all about the source code.
Do you understand anyway when and why a NullPointerException is been thrown? It is a subclass of RuntimeException and those kind of exceptions are very trival and generally indicate an design/logic/thinking fault in your code.
SomeObject someObject = null; // The someObject reference is null.
someObject.doSomething(); // Invoking a reference which is null would throw NPE.

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import java.awt.image.*;
import java.io.*;
import Acme.*;
import Acme.JPM.Encoders.*;
public class Gif extends Canvas{
     public void encodeGif(byte[] imageData){
          //create toolkit obarrayPointerect
          Toolkit t = Toolkit.getDefaultToolkit();
          MediaTracker tracker = new MediaTracker(this);
          //decode specified Gif cover
          Image img = t.createImage(imageData);
          tracker.addImage(img,0);
          try{
               tracker.waitForAll();
          catch(InterruptedException e){
          System.out.println("Tracker interrupted.");
          //retrive picture from image
          int[] pix = new int[img.getWidth(this) * img.getHeight(this)];
          PixelGrabber pg = new PixelGrabber(img, 0, 0, img.getWidth(this), img.getHeight(this), pix, 0, img.getWidth(this));
          try{ pg.grabPixels();
          } catch (InterruptedException ioe) {
               System.err.println("Interrupted");
          if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
          System.err.println("image fetch aborted or errored");
          return;
          //put into byte array
          byte[] pixels = new byte[img.getWidth(this) * img.getHeight(this)];
          for(int arrayPointer=0;arrayPointer<pix.length;arrayPointer++){
               pixels[arrayPointer] = new Integer(pix[arrayPointer]).byteValue();
          //edit pixels not implemented yet
//assign edited pixels to an image
          img = t.createImage(pixels);
          // Now encode the image using ACME free GIF encoder (www.acme.com)
          try{
               FileOutputStream fos = new FileOutputStream("D:\\result.gif");
               GifEncoder encoder = new GifEncoder(img, fos);
               encoder.encode();
               fos.close();
          }catch(IOException e) {
          System.out.println("FATAL IOException "+e);
From this i get a single pixel in my output gif file. Is there a way of swapping out the edited pixels with the origonal pixels in the image file? or an alternative way to write back the complete file.
Thanks a lot
MickyT

ive managed to solve it. For those who come across this thread and want to know the solution i needed to use MemoryImageSource with the pixels inorder to pass them to the createImage method :o)

Part of sender File name at the receiver side?

Hello All,
My requirement is like this.
iam picking the file from FTP server and place the file in another FTP server with out mapping.
I need to use part of sender file name to create the receiver side along with current date.
for example.
sender side file name : LM01000008.txt
recevier side file name need to generate : LM01dd/mm/yyyy
Please let me know how to achive this.
i tried with the blog given below, but partial file name is not possible with that blog.
http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=(J2EE3417100)ID0229698450DB11989196758750510369End?blog=/pub/wlg/6400
Thanks and Regards,
chinna

Hi Chinna,
Use this code
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMMdd");
String timestamp = dateformat.format(new Date());
String newfilename=fileName+timestamp+".txt";
// change to new file name
conf.put(key, newfilename);
return "";
Regards
Suraj

Reading a File by Knowing a part of the file name

Hi Java Gurus,
Can I copy a file to another location by knowing a part of the file name.I know the extension of the file and part of the file name.Can I copy such a file to another directory?
Eg :
0099999999_JAPPLIC_20090320.pdf is the file name.
I know the file name contains 'JAPPLIC' .Can I use this clue and the extension of the file to copy the file to another directory.
Please let me know whether it is possible or not.
Regards,
Rakesh.

Hi ,
I used the below code and I was able to solve the problem.I was able to select the files of the required extension and serach for the file names containing the text I know and use such files and move to another directory.It may be helpfulk to you people
public class FileDeletion {
public static void main (String args[]) {
     String e = "";
     String d = "C:\\TCCTouchpoints\\Attachments_Export\\outbound";
     String newFileLoc = "C:\\TCCTouchpoints\\Attachments_Export\\move";
ExtensionFilter filter = new ExtensionFilter(e);
File dir = new File(d);
File newLoc = null;
String[] list = dir.list(filter);
if (list.length == 0) return;
System.out.println("File Length "+list.length);
ArrayList fileNames = new ArrayList();
for (int i = 0; i < list.length; i++) {
/*file = new File(d + list);
boolean isdeleted = file.delete();
System.out.print(file);
System.out.println( " deleted " + isdeleted);*/
     System.out.println(list[i]);
     if(list[i].contains("_F5029.03_")){
          fileNames.add(list[i]);
          //System.out.println(list[i]);
dir = null;
for(int i=0;i<fileNames.size();i++){
     dir = new File(d+"\\"+fileNames.get(i));
     newLoc = new File(newFileLoc+"\\"+fileNames.get(i));
     if(dir.renameTo(newLoc)){
          System.out.println(dir + " is moved to "+ newLoc);
     }else {
          System.out.println("***** " dir " is not moved to "+ newLoc);
     dir = null; newLoc = null;
for(int i=0;i<list.length;i++){
     dir = new File(d+"\\"+list[i]);
     dir.delete();
class ExtensionFilter implements FilenameFilter {
private String extension;
public ExtensionFilter( String extension ) {
this.extension = extension;
public boolean accept(File dir, String name) {
return (name.endsWith(extension));
Thanks for replying .......

How to not append '.PART' to the file name of the currently downloading file, and just download the file with its normal filename

In Windows, when Firefox (I'm currently using 7.0) downloads a file, it appends ''.PART'' to the file name of the currently downloading file and just renames it to its original file name after it finishes downloading.
I sometimes like to watch a currently downloading video file, so it will be better if Firefox just downloads the file to its actual filename (like what Opera does), so I can easily double click the incompletely downloaded file and watch it with the video player assigned to that file extension, rather than the awkward ''Right click -> Open With -> Choose Default Program'' route with .part files.
Does anyone know how to set Firefox to do this?

It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox and prevents Firefox from renaming the .part file.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.
See "Disable virus scanning in Firefox preferences - Windows"
* http://kb.mozillazine.org/Unable_to_save_or_download_files

SSIS - creating part of the file name from an id in the database

I am trying to figure out how to pull an "id" from my data source to include in the file name. Right now the file name created looks like customer_002_timestamp.txt. I need to add the id to the file name and I need to grab it at the time I get
the data, so then the file name becomes customer_002_id_timestamp.txt.
My data source is Oracle and I am using Attunity, so I do not have the capability of using the resultset found in the SQL Task because I have to use the data task.
Has anyone ever extracted an id from a query against Oracle using the Attunity connector to add as part of the file name? If so, how would I add that to my control flow task?
Thanks in advance for any assistance.

Is it a static id value you want
Then you can just use a SSIS variable to hold value from resultset in execute sql task
Then inside your data flow you can use an expression for setting value of another variable which can be used for setting filename in your destination task. The expression will include logic to concatenate id variable also which we populated in the previous
step.
Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
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When I download files, firefox is adding " .part " to the file name and the file won't open, but if i back the .part out, it opens fine.

Firefox seems to be adding " .part " to the file names of files I downoad. Here's an example:
YuT9iNv8.pdf.part
I cannot open this file because it can't find an application.
If I back out the .part, I get a box asking if I want to change the extension to .pdf I check yes, and everything works fine. It doesn't happen with other browsers (Safai).

I get the error message saying the file could not be downloaded due because there is no enough disk space.
How large is your HD and how much space do you have left?

SAPCAR: could not open for writing SAPCAR (error 28). Text file busy

Hi,
I´m trying to decompress this file( is for a kernel upgrade):
SAPEXE_15-10006264.SAR
And when I do SAPCAR u2013xvf SAPEXE_15-10006264.SAR, SAPCAR only decompress a few files and I´ve this error:
SAPCAR: could not open for writing SAPCAR (error 28). Text file busy
Instead when I decompress the SAPEXEDB_15-10006263.SAR, SAPCAR does this correctly. I´ve tried to download again the file but the error is always the same.Could someone help me?
Best regards,

Hi,
Now, I´ve unpacked the files but when I do the file copy (in order to upgrade the kernel), I´ve these errors:
cp: cannot create /usr/sap/SMD/exe/jcontrol: Text file busy
cp: cannot create /usr/sap/SMD/exe/jlaunch: Text file busy
cp: cannot create /usr/sap/SMD/exe/libicudata.sl.30: Text file busy
cp: cannot create /usr/sap/SMD/exe/libicui18n.sl.30: Text file busy
cp: cannot create /usr/sap/SMD/exe/libicuuc.sl.30: Text file busy
cp: cannot create /usr/sap/SMD/exe/sapstart: Text file busy
cp: cannot create /usr/sap/SMD/exe/sapstartsrv: Text file busy
So could you help me?
Best regards,

I'v downloaded a tv series,paid for it, its in my itunes but with exclamation marks next to it, every time it tries to download the series it says "part of the file seems to be corrupted" and tells me to redownload it.Tried that and it comes up the same.

I'v downloaded a tv series,paid for it, its in my itunes but with exclamation marks next to it, every time it tries to download the series it says "part of the file seems to be corrupted" and tells me to redownload it.Tried that 8 times and it comes up the same. What do I do?

Clear the contents of ...iTunes\iTunes Media\Download and try one more time.
If the problem recurs use the "report a problem" links in your account history and explain what has happened so far. There may be a problem with the source rather than your download of it.
tt2

Everytime i try and download any apps i get an error message telling me that part of the file seems to be corrupted. How do i resolve this issue

Everytime i try and download any apps i get an error message telling me that part of the file seems to be corrupted. How do i resolve this issue

Could be.
This may be hard to believe, but I think my problem was that the built-in WiFi adapter on my HP desktop had
gotten flaky. I switched to a Buffalo USB WiFi and the problem immediately disappeared. I never saw any errors, etc. from the Ralink adapter. Strange. Might try another type of connection to the Internet.

[svn:fx-trunk] 9317: Added ASDoc version tagging to all parts of these files where it was missing .

Revision: 9317
Author:   [email protected]
Date:     2009-08-14 14:13:16 -0700 (Fri, 14 Aug 2009)
Log Message:
Added ASDoc version tagging to all parts of these files where it was missing. Code builds and Checkintest passes.
Modified Paths:
    flex/sdk/trunk/frameworks/projects/rpc/src/mx/messaging/Channel.as
    flex/sdk/trunk/frameworks/projects/rpc/src/mx/messaging/MessageAgent.as

Thats good news.

To import a part of a file

sorry, my English leaves much to be desired...
I'd like to know the reason why Adobe Premiere pro has not the possibility of importing into a project only a part of a file already on a hard disc.
Very frequently we need to import into our project only few seconds or at most few minutes of a file already on a hard disc, and it is absurd to import the whole file and to take up a lot of GB.
Moreover, in my opinion a very good import function would have to offer the possibility of import the chosen part of the physical file direcly into the same library of our project...
What do you think about?

Also, in order to ingest only part of a long clip, Prelude must transcode it to a Digital Intermediate. And that DOES create a new file that takes up hard drive space. That is fine with me except for the "transcode" part.
I have asked for this capability without transcoding and was pleased to get a response from an Adobe engineer asking me how I thought it should work.
I explained that it should be possible to slice up a file without changing the codec or causing a generational loss. That only applies to all I-Frame footage, of course.
With a long GOP even if the user said to cut at 1;31;04, unless the long GOP started with that frame (a one in 29.97 chance perhaps) the cuts should begin at the beginning of the GOP. And end at the end of a long GOP.
In fact, I said I was not opposed to a full second or so of handles before and after the cuts. It might be a hassle for some of us, but it would save problems for lots of people.
Let's face it, sometimes we don't need the entire 30 minute clip. But it isn't tape so we can't just capture the parts we want. So we get stuck with huge files. I would like to see a bunch of shorter, usable files on my hard drive instead of one long one. Besides, you could make notes in the Metadata and do a better job of organizing if you had smaller files - if you are the type to use clips from various shoots in various projects.

Can i remove a particular part of a file?

I have a file. I want to remove a particular of that file. I have that Outputstream for that particular portion. How can i do it?
Thanks

use the bufferedinputstream to read the part of the file and write onto the same file using bufferedoutputstream or create a new file and write onto it.... simple.

Writing to Muliple Parts of a File

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