Writing/reading 3 arrays in one file

hello guys
i am trying to write 3 different arrays(size 25) in one file and seek to retrieve them independently to generate a comparative graph of performance in a different window, as i m designing a biological simulator.
please help me here as i m not sure how to write/read them individually in one file.
thanks a lot in advance
avi

Just write them to a sequentual access file and separate them with some sort of special character. Otherwise use random access files because you know the length of the arrays. http://java.sun.com/docs/books/tutorial/essential/io/rafs.html
I would go with the first because it is the easiest.

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Writing multiple images to one file using ImageIO

I am having trouble saving and reading multiple images from to/from one file. Here is the best i can come up with:
//this is utilizing an ObjectOutputStream because i need to also save some objects to the file
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oos.writeInt(ImageTable.size());
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The code does run and saves something, although it is hard to tell exactly what it is saving since it is all in png format, it also loads the first image properly.

Is it possible to pack the different images in one big image?Conversely, some image formats let you store multiple images in a single image file.
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import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import java.util.*;
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import java.util.List;
public class MultiImageTest {
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        URL url2 = new URL("http://today.java.net/jag/bio/JAG2001small.jpg");
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Java writing out bytes from one file, reading back in again

Hi, I'm having some trouble with bytes.
I have one program which outputs the following bytes into a file (using Printstream.write() - I'm sure that this program is working fine):
4 0 64 0 4 0 128 0 63 223 64 20 4 16 130 0 60 16 64 1 63 223 79 236 64 16 195 232 116 63 255 232 148 0 0 0
I'm then reading in the bytes using the code given on this page (http://www.exampledepot.com/egs/java.io/File2ByteArray.html)
and I get...
4 0 64 0 4 0 -128 0 63 -33 64 20 4 16 -126 0 60 16 64 1 63 -33 79 -20 64 16 -61 -24 116 63 -1 -24 -108 0 0 0
As you can see I now have negative numbers - I noticed that if I do 256 + (the negative number) then i get the number I originally wrote out
I tried fixing this when I read in by doing
bytes[i] = (byte) (256 + bytes);
but it doesn't change anything
how can I either change it so it reads in the bytes exactly as i wrote them out, or write a bit of code that takes the negatives and converts them to the original positives?
thx

Unconditional wrote:
Integer x1 = (bytes[i] << 24) & 0xFF;
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                  Integer x3 = (bytes[i+2] << 8) & 0xFF;
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returns
x1 0 x2 0 x3 0 x4 0
x1 0 x2 0 x3 0 x4 4
x1 0 x2 0 x3 0 x4 0
x1 0 x2 0 x3 0 x4 128
x1 0 x2 0 x3 0 x4 0
x1 0 x2 0 x3 0 x4 63
x1 0 x2 0 x3 0 x4 223
x1 0 x2 0 x3 0 x4 64
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Help!! Trying to writing an array to a file without having to rewrite the old data every time.

Hey Everyone,
I have a vi that takes a 2D array and writes it to an xml file. The purpose for this is to characterize the pathloss through a dowkey 10x10 matrix at varies frequencies. I use this program to create a look-up table for the switch matrix so when I conduct one of my automated tests I can obtain an accurate measurment. The problem with this is I am taking about 299 data points per switch matrix combination leading me to over 32000 data points in the look-up table. The reason I use xml is because each data point needs a header so I can parse through the look-up table with another one of my vi's when I need that pathloss. What I am trying to fix is that when my vi writes to a file it writes one array at a time to save memory space. When it writes it rewrites the old data then the new data. As the number of data points increase so does the lag time to write to the file. By the time I am done it takes about five hours to fully write to the file. Does anyone know of a way to write continuesly write to a file without having to rewrite all of the old data? Attached is my vi for writing to the file, my vi for searching through the file, and an example of one of my look-up tables.
Thanks,
Dustin
Solved!
Go to Solution.
Attachments:
Find Array_TestStand.vi ‏22 KB
Write to XML.vi ‏21 KB
Pathloss_Array_tests.zip ‏149 KB

dlovell wroteoes anyone know of a way to write continuesly write to a file without having to rewrite all of the old data?
The only way to do that is to only append to the end of your file. This would probably require some rewriting of your header information.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to read arrays from a file

hi i was curious if i have a data file something like this
34 12 10 5 4 3
23 12 11 19 18
42 32 23 12 11
how can i read this data file and lines into three different arrays
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          //int[] myArray1 = new int[10];
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lol you stupid fookks.
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int[] array2=new int[s2.length];
for(int i=0;i<s2.length;i++)
array2[i]=Integer.parseInt(s2[i]);
s=bf.readLine();
String s3[]=s.split("\\s");
int[] array3=new int[s3.length];
for(int i=0;i<s3.length;i++)
array3[i]=Integer.parseInt(s3[i]);
kiss my asian a$$ you all think i am a dumb fok well you know what you have freakin attitude problems. i can do it on my own also you all dumb senior foks. i asked for help warnerja not for your stupid a$$ comments fok yuou.... i am not a freakin newbie just new to this file. stuff. thats all all i was doing was asking for help

Writing int [ ] Array in a file

Hye
Can you tell me which Stream I can use to write an Integer Array (defined as int [ 7000]) in a file .txt
I want to write as a whole not one by one.
Thanks

import java.util.Vector;
import java.io.*;
public class Queue extends Vector {
** FIFO, first in first out
Queue() {
super();
void put(Object o) {
addElement(o);
Object get() {
if (isEmpty()) return null;
    Object o = firstElement();
    removeElement(o);
    return o;
Object peek() {
if (isEmpty()) return null;
    return firstElement();
To serialize (save the Queue state to a file) :
public static void main(String args[]) {
Queue theQueue;
theQueue = new Queue();
theQueue.put(new int[]{1, 2, 3, 4});
theQueue.put("ABCDE");
theQueue.put(new Integer(3));
System.out.println(theQueue.toString());
// serialize the Queue
System.out.println("serializing theQueue");
try {
      FileOutputStream fout = new FileOutputStream("thequeue.dat");
      ObjectOutputStream oos = new ObjectOutputStream(fout);
      oos.writeObject(theQueue);
      oos.close();
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To unserialize (to load a previously saved Queue) :
public static void main(String args[]) {
   Queue theQueue;
   theQueue = new Queue();
   // unserialize the Queue
   System.out.println("unserializing theQueue");
   try {
    FileInputStream fin = new FileInputStream("thequeue.dat");
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Writing random array positions to file

Hi all.
I have an array of 1000 positions each consisting of a String.
I want to write the strings equally to two seperate text files which i have managed without any probs.
The problem is i want to write these strings in a total random order so each time its run different strings would end up in different files and in total different order.
i know how to generate a random number but not sure how to access all positions of the array but in random order.
Any help would be appreciated.
thanks

The Random class has methods that generate random ints.
You can use those ints to index the array and get the String from that position.
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Random.html

WLST define array in properties file and access in WLST

Hi Guys,
Just had a question, I am developing WLST script to configure WebLogic manage server instances and want to do in much way that user need to update properties file and then WLST/python reads it and logic in the script will configure # of manage server instances specified in properties file..
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You don't have to define you parameter as an array (a=['one'],['two'], etc) at the properties file. I think that this is a good way to do what you want:
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Hi,
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Thanks,
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Deploy and retest.
cheers
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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");
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private int currentProductIndex;
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public Inventory6() {
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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()]);
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// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
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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();
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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();
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jPanel2 = new javax.swing.JPanel();
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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();
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prodNameField.setEditable(false);
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colorField.setEditable(false);
colorField.addActionListener(new java.awt.event.ActionListener() {
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colorFieldActionPerformed(evt);
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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);
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jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
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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))
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.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)
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.addComponent(invenValueLbl))
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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.

How to read from a text file one character at a time?

Hello
I wish to read from a text file in a for loop and that on every iteration i read one charachter and proceed to the next one.
can anyone help me?
Lavi

lava wrote:
I wish to read from a text file in a for loop and that on every iteration i read one charachter and proceed to the next one.
can anyone help me?
Some additional comments:
You really don't want to read any file one character at a time, because it is highly inefficient. More typically, you read the entire file into memory with one operation (or at least a large chunk, if the file is gigantic) and then do the rest of the operations in memory. One easy way to analyze it one byte at a time would be to use "string to byte array" and then autoindex into a FOR loop, for example.
Of course you could also read the file directly as a U8 array instead of a string.
Message Edited by altenbach on 06-10-2008 08:57 AM
LabVIEW Champion . Do more with less code and in less time .

Expdp with parallel writing in one file at a time on OS

Hi friends,
I am facing a strange issue.Despite giving parallel=x parameter the expdp is writing on only one file on OS level at a time,although it is writing into multiple files sequentially (not concurrently)
While on other servers i see that expdp is able to start writing in multiple files concurrently. Following is the sample log
of my expdp .
++++++++++++++++++++
Export: Release 10.2.0.3.0 - 64bit Production on Friday, 15 April, 2011 3:06:50
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
Starting "CNVAPPDBO4"."EXPDP_BL1_DOCUMENT": CNVAPPDBO4/********@EXTTKS1 tables=BL1_DOCUMENT DUMPFILE=DUMP1_S:Expdp_BL1_DOCUMENT_%U.dmp LOGFILE=LOG1_S:Expdp_BL1_DOCUMENT.log CONTENT=DATA_ONLY FILESIZE=5G EXCLUDE=INDEX,STATISTICS,CONSTRAINT,GRANT PARALLEL=6 JOB_NAME=Expdp_BL1_DOCUMENT
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 23.93 GB
. . exported "CNVAPPDBO4"."BL1_DOCUMENT" 17.87 GB 150951906 rows
Master table "CNVAPPDBO4"."EXPDP_BL1_DOCUMENT" successfully loaded/unloaded
Dump file set for CNVAPPDBO4.EXPDP_BL1_DOCUMENT is:
/tksmig/load2/oracle/postpaidamd/DUMP1_S/Expdp_BL1_DOCUMENT_01.dmp
/tksmig/load2/oracle/postpaidamd/DUMP1_S/Expdp_BL1_DOCUMENT_02.dmp
/tksmig/load2/oracle/postpaidamd/DUMP1_S/Expdp_BL1_DOCUMENT_03.dmp
/tksmig/load2/oracle/postpaidamd/DUMP1_S/Expdp_BL1_DOCUMENT_04.dmp
Job "CNVAPPDBO4"."EXPDP_BL1_DOCUMENT" successfully completed at 03:23:14
++++++++++++++++++++
uname -aHP-UX ocsmigbrndapp3 B.11.31 U ia64 3522246036 unlimited-user license
Is it hitting any known bug? Please suggest.
regds,
kunwar

PARALLEL always using with DUMPFILE=filename_*%U*.dmp. Did yoy put the same parameter on target server?
PARALLEL clause depend on server resources. If the system resources allow, the number of parallel processes should be set to the number of dump files being created.

Read from one file ... and write

I had written below code to read from a file
which has input in below format...
$ filla
% dillla
I wrote a code to read from the below file and I want to write into another file...
in another format...like
filla, $
dilla, %
I wrote as below... but my code doesn't work....i commented most of the code becoz I doubt ....
I read the file...line by line...
each line has two words one is special characters($ or %) and the other is some name... separated by space..
I stored both in different arrays...and thought to write them in output file...
import java.io.*;
public class data
     public static void main(String args[])
          int kMaxLines = 60000;
            String[][] valuePairs = new String[2][kMaxLines];
            String symbol [] = new String[kMaxLines];
         String name [] = new String[kMaxLines];
         int k = 0;
                 try
                FileInputStream fstream = new FileInputStream("c:/inputs.txt");
                  DataInputStream datastream = new DataInputStream(fstream);
                  BufferedReader br = new BufferedReader(new InputStreamReader(datastream));
                  //FileWriter output = new FileWriter("c:/output.txt");
             //BufferedWriter bw = new BufferedWriter(output);
                  String names;
                  String strLine;
                  int line = 0;
                  while ((strLine = br.readLine()) != null)
                       String temp_strs[] = strLine.split(" ");
                      for (int j = 0; j < 2; j++)
                      valuePairs[j][line] = temp_strs[j];
                     //System.out.println(temp_strs[0] + " " + temp_strs[1]);
                      symbol[k]= temp_strs[0];
                      name[k]=temp_strs[1];
                      line++;
                      k++;
                  for (k=0; k < kMaxLines; k ++)
                  System.out.println(symbol[k]+ "" + name[k]); // when I print it is giving null value...
                  } // so what I do to get those values into global array...
                      datastream.close();
          // to write to file
             //String names_str;
                    //bw.write("@relation train");
              //for(k=0; k<kMaxLines; k++)
              // names_str = names+""+name[k];
               //bw.write("@attribute names" + " {"+names_str+"}");
               //bw.write("@attribute class {+,-}");
               //bw.write("@data"+"\n");
              // for (k=0;k<kMaxLines; k++)
               //bw.write("name[k]+","+symbol[k]");
                 catch (Exception e)
                //file not found exception...
                      e.printStackTrace();

Why the multiple arrays?
I'd just read it into List<String[]>... an extensible collection of "the fields on each line"... then you just write them out as required.
    second-field + comma + first-field.
I suggest your next move should be to take a backup copy of your current class then rip-all that commented-out code out of it, and reformat it properly... starting from a clean(er) slate... then try swapping over to a List<String[]> instead of that cumbersome String[][] matrix.
Try that... if you get stuckeroonied then don't be afraid to ask again.
Cheers. Keith.

Writing data from two different acquisition rates into one file

Hi,
I'm using a compactRIO, and I have an anemometer outputting data at 4Hz to the serial port on the controller, and I am using a 9237 module to read strain from two channels at 40Hz. I would like to record all this data in one file, but I'm unsure how to have the data points match up with respect to time since they are read at different rates. Basically I have 10 strain data points for every one anemometer data point, but that one data point needs to somehow be associated with the other 10 read in the same amount of time. It would be okay to "extend" the slower data to the 10 strain points, and likewise to the next ten when the anemometer refreshes its values.
Thanks for any input!
Andrew

Check out the Queue multi-plexer vi from the examples. C:\Program Files\National Instruments\LabVIEW 2009\examples\general\queue.llb\Queue Multiplexer.vi
If each data acquisition loop enqueues data to one file writing loop the data is writen in order. Queues are really a good way to multiplex data sources
Message Edited by Jeff Bohrer on 01-29-2010 09:44 AM
Jeff

Help with writing, reading a file...

I'm writing a program that writes a number to a file and then reads it again each time it is loaded. It's like a counter, the number starts out being 0, then when the program is run again the number will be two, and so on and so on. I've never been good with writing incrementer type things and files, so could you help me out? Remember, the program writes a single number to the file, and then adds one to that number each time the program is run, so it starts at zero and goes up by one each time it is run.
-Thanks... I just came back from vacation and my Java skills are somewhat lacking :P

open old file -> get the number -> create a new file -> write new number

Writing/reading 3 arrays in one file

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