How can I read a specific character from a text file?
Hi All!
I would like to read a specific character from a text file, e.g. the 2012th character in a text file with 7034 characters.
How can I do this?
Thanks
Johannes
just use the skip(long) method of the input stream that reads the text file and skip over the desired number of bytes
Similar Messages
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How can i read all the lines from a text file in specific places and use the data ?
string[] lines = File.ReadAllLines(@"c:\wmiclasses\wmiclasses1.txt");
for (int i = 0; i < lines.Length; i++)
if (lines[i].StartsWith("ComboBox"))
And this is how the text file content look like:
ComboBox Name cmbxOption
Classes Win32_1394Controller
Classes Win32_1394ControllerDevice
ComboBox Name cmbxStorage
Classes Win32_LogicalFileSecuritySetting
Classes Win32_TapeDrive
What i need to do is some things:
1. Each time the line start with ComboBox then to get only the ComboBox name from the line for example cmbxOption.
Since i have already this ComboBoxes in my form1 designer i need to identify where the cmbxOption start and end and when the next ComboBox start cmbxStorage.
2. To get all the lines of the current ComboBox for example this lines belong to cmbxOption:
Classes Win32_1394Controller
Classes Win32_1394ControllerDevice
3. To create from each line a Key and Value for example from the line:
Classes Win32_1394Controller
Then the key will be Win32_1394Controller and the value will be only 1394Controller
Then the second line key Win32_1394ControllerDevice and value only 1394ControllerDevice
4. To add to the correct belonging ComboBox only the value 1394Controller.
5. To make that when i select in the ComboBox for example in cmbxOption the item 1394Controller it will act like i selected Win32_1394Controller.
For example in this event:
private void cmbxOption_SelectedIndexChanged(object sender, EventArgs e)
InsertInfo(cmbxOption.SelectedItem.ToString(), ref lstDisplayHardware, chkHardware.Checked);
In need that the SelectedItem will be Win32_1394Controller but the user will see in the cmbxOption only 1394Controller without the Win32_
This is the start of the method InsertInfo
private void InsertInfo(string Key, ref ListView lst, bool DontInsertNull)
That's why i need that the Key will be Win32_1394Controller but i want that the user will see in the ComboBox only 1394Controller without the Win32_Hello,
Here is a running start on getting specific lines in the case lines starting with ComboBox. I took your data and placed it into a text file named TextFile1.txt in the bin\debug folder. Code below was done in
a console app.
using System;
using System.IO;
using System.Linq;
namespace ConsoleApplication1
internal class Program
private static void Main(string[] args)
var result =
from T in File.ReadAllLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "TextFile1.txt"))
.Select((line, index) => new { Line = line, Index = index })
.Where((s) => s.Line.StartsWith("ComboBox"))
select T
).ToList();
if (result.Count > 0)
foreach (var item in result)
Console.WriteLine("Line: {0} Data: {1}", item.Index, item.Line);
Console.ReadLine();
Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my webpage under my profile but do not reply to forum questions. -
How can I add random mail signatures from a text file?
I'm trying to add a different quote to every email that I write... is there a program or way for Mail to pluck and append a quote at random from a external file of quotes? (I'm not talking about the standard "Random" feature built into Mail.)
There must be one out there, but I can't find it. I'm using Snow Leopard and Mail 4.5Hello,
Here is a running start on getting specific lines in the case lines starting with ComboBox. I took your data and placed it into a text file named TextFile1.txt in the bin\debug folder. Code below was done in
a console app.
using System;
using System.IO;
using System.Linq;
namespace ConsoleApplication1
internal class Program
private static void Main(string[] args)
var result =
from T in File.ReadAllLines(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "TextFile1.txt"))
.Select((line, index) => new { Line = line, Index = index })
.Where((s) => s.Line.StartsWith("ComboBox"))
select T
).ToList();
if (result.Count > 0)
foreach (var item in result)
Console.WriteLine("Line: {0} Data: {1}", item.Index, item.Line);
Console.ReadLine();
Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my webpage under my profile but do not reply to forum questions. -
How can I create a Document object from a text file (myFile.txt)
Hi everybody:
Thank you for reading this message.
I am trying to find a method to convert a text file ( I have it in a File object) to a Document object.
I read the Java API but it is strange, I do not know if I have to create an AbstractDocument, it is really strange for me.
Any comment is welcome,
Regards,
JBDocument is an interface, and AbstractDocument is abstract, so you
can't create either of those directly. Assuming you are dealing with a
a plain text file, you could do something like
// Not catching any exceptions that get thrown
File file = /* file you already have */
String eol = System.getProperty( "line.separator" );
int eolLen = eol.length();
FileReader reader = new FileReader( file );
BufferedReader buffer = new BufferedReader( reader );
PlainDocument doc = new PlainDocument();
for ( String line = buffer.readLine() ; line != null ; line = buffer.readLine() ) {
int len = doc.getLength();
if ( len > 0 ) {
doc.insertString( len, eol, null );
len += eolLen;
doc.insertString( len, line, null );
}and now you have a document.
: jay -
How can I save one specific page from a .pdf file into it's own .pdf file?
I've got this 4 page pdf file, and I need to save just one page from it. I know that there's the option of using the select tool and doing a copy/paste to an image file, but I'm trying to keep it as a .pdf and I can't seem to figure it out. Any help would be much appreciated.
Perhaps this solutions workability will depend a lot on what type and generation of PDF you got and the tech built into the program suggested....
But ! (never-the-less)
You could try to see if the "Free PDF to Word Doc Converter version 1.1" will work for you....
I know it will not get you a single page .PDF but if the program works you could get a .Doc of which you might have the possibility to save a single page after editing it !(?) -
How can I use Automator to extract specific Data from a text file?
I have several hundred text files that contain a bunch of information. I only need six values from each file and ideally I need them as columns in an excel file.
How can I use Automator to extract specific Data from the text files and either create a new text file or excel file with the info? I have looked all over but can't find a solution. If anyone could please help I would be eternally grateful!!! If there is another, better solution than automator, please let me know!
Example of File Contents:
Link Time =
DD/MMM/YYYY
Random
Text
161 179
bytes of CODE memory (+ 68 range fill )
16 789
bytes of DATA memory (+ 59 absolute )
1 875
bytes of XDATA memory (+ 1 855 absolute )
90 783
bytes of FARCODE memory
What I would like to have as a final file:
EXCEL COLUMN1
Column 2
Column3
Column4
Column5
Column6
MM/DD/YYYY
filename1
161179
16789
1875
90783
MM/DD/YYYY
filename2
xxxxxx
xxxxx
xxxx
xxxxx
MM/DD/YYYY
filename3
xxxxxx
xxxxx
xxxx
xxxxx
Is this possible? I can't imagine having to go through each and every file one by one. Please help!!!Hello
You may try the following AppleScript script. It will ask you to choose a root folder where to start searching for *.map files and then create a CSV file named "out.csv" on desktop which you may import to Excel.
set f to (choose folder with prompt "Choose the root folder to start searching")'s POSIX path
if f ends with "/" then set f to f's text 1 thru -2
do shell script "/usr/bin/perl -CSDA -w <<'EOF' - " & f's quoted form & " > ~/Desktop/out.csv
use strict;
use open IN => ':crlf';
chdir $ARGV[0] or die qq($!);
local $/ = qq(\\0);
my @ff = map {chomp; $_} qx(find . -type f -iname '*.map' -print0);
local $/ = qq(\\n);
# CSV spec
# - record separator is CRLF
# - field separator is comma
# - every field is quoted
# - text encoding is UTF-8
local $\\ = qq(\\015\\012); # CRLF
local $, = qq(,); # COMMA
# print column header row
my @dd = ('column 1', 'column 2', 'column 3', 'column 4', 'column 5', 'column 6');
print map { s/\"/\"\"/og; qq(\").$_.qq(\"); } @dd;
# print data row per each file
while (@ff) {
my $f = shift @ff; # file path
if ( ! open(IN, '<', $f) ) {
warn qq(Failed to open $f: $!);
next;
$f =~ s%^.*/%%og; # file name
@dd = ('', $f, '', '', '', '');
while (<IN>) {
chomp;
$dd[0] = \"$2/$1/$3\" if m%Link Time\\s+=\\s+([0-9]{2})/([0-9]{2})/([0-9]{4})%o;
($dd[2] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of CODE\\s/o;
($dd[3] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of DATA\\s/o;
($dd[4] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of XDATA\\s/o;
($dd[5] = $1) =~ s/ //g if m/([0-9 ]+)\\s+bytes of FARCODE\\s/o;
last unless grep { /^$/ } @dd;
close IN;
print map { s/\"/\"\"/og; qq(\").$_.qq(\"); } @dd;
EOF
Hope this may help,
H -
How can i get the all values from the Property file to Hashtable?
how can i get the all values from the Property file to Hashtable?
ok,consider my property file name is pro.PROPERTIES
and it contain
8326=sun developer
4306=sun java developer
3943=java developer
how can i get the all keys & values from the pro.PROPERTIES to hashtable
plz help guys..............The Properties class is already a subclass of Hashtable. So if you have a Properties object, you already have a Hashtable. So all you need to do is the first part of that:Properties props = new Properties();
InputStream is = new FileInputStream("tivoli.properties");
props.load(is); -
How can i remove the phone number from the text messages that i receive in the notification center
how can i remove the phone number from the text messages that i receive in the notification center?
You choose whether to see text messages in Notification Center or not. If you elect to see them, they will display the phone number (unless they are from a contact in your contacts list).
You can choose not to see them at Settings > Notification Center > Messages. -
I can't read in a date from a txt file
Im not sure of the code needed to read in a date from the text file, this is an example of the text file:
1
2
2003
ie,
day
month year
I have to read in this date, this is the set method for the date:
public void setPurchaseDate (int d, int m, int y)
new Date(d,m,y);
And this is the code that I have tried using to readin the date:
PurchaseDate=(Integer.parseInt(line),Integer.parseInt(line),Integer.parseInt(line));now i know its wrong, I just dont know what the code should be!!
Cheersok, I am going to go through it and see what values I can and cant read in, here is the code i am trying to use:
private void addx()
FileReader fin;
int noBooks;
int itemNum;
String title;
String subject;
double costNew;
double costPaid;
String isbn;
double sellingPrice = 0;
int noAuthors;
int day;
int month;
int year;
String seperator = "#";
Book[] book = new Book[9];
try
fin = new FileReader("Books.txt");
BufferedReader buff = new BufferedReader(fin);
String line = buff.readLine();
int count= 0;
//read in Number of books
noBooks=Integer.parseInt(line);
while( line != null)
//Read in item number
itemNum = Integer.parseInt(line);
//Read in title
title = buff.readLine();
//Read in number of authors
noAuthors=Integer.parseInt(line);
//Read each line in as an author until number of authors reached
ArrayList authors = new ArrayList();
for(int i=0; i < noAuthors ; i++)
authors.add(buff.readLine());
//Read in cost new
costNew = Double.parseDouble(line);
//Read in subject
subject = buff.readLine();
//Read in ISBN
isbn = buff.readLine();
//Read in purchase day
day = Integer.parseInt(line);
//Read in purchase month
month=Integer.parseInt (line);
//Read in purchase year
year = Integer.parseInt (line);
//Read in cost paid
costPaid = Double.parseDouble(line);
line = buff.readLine();
//Pass date, month and year values to array
Date purchaseDate =new Date(day,month,year);
//Pass values to constructor
if (line.equals(seperator))
book[count++] = new Book(itemNum, title, authors, subject, purchaseDate,costNew,costPaid,isbn, sellingPrice,noAuthors);
// line = buff.readLine();
System.out.println(book.toString());
catch(Exception ex)
System.out.println(ex.toString());
} -
Reading a Random Line from a Text File
Hello,
I have a program that reads from a text file words. I currently have a text file around 800KB of words. The problem is, if I try to load this into an arraylist so I can use it in my application, it takes wayy long to load. I was wondering if there was a way to just read a random line from the text file.
Here is my code, and the text file that the program reads from is called 'wordFile'
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class WordColor extends JFrame{
public WordColor(){
super("WordColor");
setSize(1000,500);
setVisible(true);
add(new WordPanel());
public static void main(String[]r){
JFrame f = new WordColor();
class WordPanel extends JPanel implements KeyListener{
private Graphics2D pane;
private Image img;
private char[]characterList;
private CharacterPosition[]positions;
private int charcounter = 0;
private String initialWord;
private File wordFile = new File("C:\\Documents and Settings\\My Documents\\Java\\projects\\WordColorWords.txt");
private FontMetrics fm;
private javax.swing.Timer timer;
public final static int START = 20;
public final static int delay = 10;
public final static int BOTTOMLINE = 375;
public final static int buffer = 15;
public final static int distance = 4;
public final static Color[] colors = new Color[]{Color.red,Color.blue,Color.green,Color.yellow,Color.cyan,
Color.magenta,Color.orange,Color.pink};
public static String[] words;
public static int descent;
public static int YAXIS = 75;
public static int SIZE = 72;
public WordPanel(){
words = readWords();
setLayout(new BorderLayout());
initialWord = getWord();
characterList = new char[initialWord.length()];
for (int i=0; i<initialWord.length();i++){
characterList[i] = initialWord.charAt(i);
setFocusable(true);
addKeyListener(this);
timer = new javax.swing.Timer(delay,new ActionListener(){
public void actionPerformed(ActionEvent evt){
YAXIS += 1;
drawWords();
if (YAXIS + descent - buffer >= BOTTOMLINE) lose();
if (allColorsOn()) win();
public void paintComponent(Graphics g){
super.paintComponent(g);
if (img == null){
img = createImage(getWidth(),getHeight());
pane = (Graphics2D)img.getGraphics();
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
pane.setFont(new Font("Arial",Font.BOLD,SIZE));
pane.setColor(Color.black);
drawThickLine(pane,getWidth(),5);
fm = g.getFontMetrics(new Font("Arial",Font.BOLD,SIZE));
descent = fm.getDescent();
distributePositions();
drawWords();
timer.start();
g.drawImage(img,0,0,this);
private void distributePositions(){
int xaxis = START;
positions = new CharacterPosition[characterList.length];
int counter = 0;
for (char c: characterList){
CharacterPosition cp = new CharacterPosition(c,xaxis, Color.black);
positions[counter] = cp;
counter++;
xaxis += fm.charWidth(c)+distance;
private void drawThickLine(Graphics2D pane, int width, int thickness){
pane.setColor(Color.black);
for (int j = BOTTOMLINE;j<BOTTOMLINE+1+thickness;j++){
pane.drawLine(0,j,width,j);
private void drawWords(){
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
drawThickLine(pane,getWidth(),5);
for (CharacterPosition cp: positions){
int x = cp.getX();
char print = cp.getChar();
pane.setColor(cp.getColor());
pane.drawString(""+print,x,YAXIS);
repaint();
private boolean allColorsOn(){
for (CharacterPosition cp: positions){
if (cp.getColor() == Color.black) return false;
return true;
private Color randomColor(){
int rand = (int)(Math.random()*colors.length);
return colors[rand];
private void restart(){
charcounter = 0;
for (CharacterPosition cp: positions){
cp.setColor(Color.black);
private void win(){
timer.stop();
newWord();
private void newWord(){
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
repaint();
drawThickLine(pane,getWidth(),5);
YAXIS = 75;
initialWord = getWord();
characterList = new char[initialWord.length()];
for (int i=0; i<initialWord.length();i++){
characterList[i] = initialWord.charAt(i);
distributePositions();
charcounter = 0;
drawWords();
timer.start();
private void lose(){
timer.stop();
pane.setColor(Color.white);
pane.fillRect(0,0,getWidth(),getHeight());
pane.setColor(Color.red);
pane.drawString("Sorry, You Lose!",50,150);
repaint();
removeKeyListener(this);
final JPanel p1 = new JPanel();
JButton again = new JButton("Play Again?");
p1.add(again);
add(p1,"South");
p1.setBackground(Color.white);
validate();
again.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
remove(p1);
addKeyListener(WordPanel.this);
newWord();
private String getWord(){
int rand = (int)(Math.random()*words.length);
return words[rand];
private String[] readWords(){
ArrayList<String> arr = new ArrayList<String>();
try{
BufferedReader buff = new BufferedReader(new FileReader(wordFile));
try{
String line = null;
while (( line = buff.readLine()) != null){
line = line.toUpperCase();
arr.add(line);
finally{
buff.close();
catch(Exception e){e.printStackTrace();}
Object[] objects = arr.toArray();
String[] words = new String[objects.length];
int count = 0;
for (Object o: objects){
words[count] = (String)o;
count++;
return words;
public void keyPressed(KeyEvent evt){
char tempchar = evt.getKeyChar();
String character = ""+tempchar;
if (character.equalsIgnoreCase(""+positions[charcounter].getChar())){
positions[charcounter].setColor(randomColor());
charcounter++;
else if (evt.isShiftDown()){
evt.consume();
else{
restart();
drawWords();
public void keyTyped(KeyEvent evt){}
public void keyReleased(KeyEvent evt){}
class CharacterPosition{
private int xaxis;
private char character;
private Color color;
public CharacterPosition(char c, int x, Color col){
xaxis = x;
character = c;
color = col;
public int getX(){
return xaxis;
public char getChar(){
return character;
public Color getColor(){
return color;
public void setColor(Color c){
color = c;
}I thought that maybe serializing the ArrayList might be faster than creating the ArrayList by iterating over each line in the text file. But alas, I was wrong. Here's my code anyway:
class WordList extends ArrayList<String>{
long updated;
WordList readWordList(File file) throws Exception{
WordList list = new WordList();
BufferedReader in = new BufferedReader(new FileReader(file));
String line = null;
while ((line = in.readLine()) != null){
list.add(line);
in.close();
list.updated = file.lastModified();
return list;
WordList wordList;
File datFile = new File("words.dat");
File txtFile = new File("input.txt");
if (datFile.exists()){
ObjectInputStream input = new ObjectInputStream(new FileInputStream(datFile));
wordList = (WordList)input.readObject();
if (wordList.updated < txtFile.lastModified()){
//if the text file has been updated, re-read it
wordList = readWordList(txtFile);
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
output.writeObject(wordList);
output.close();
} else {
//serialized list does not exist--create it
wordList = readWordList(txtFile);
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
output.writeObject(wordList);
output.close();
}The text file contained one random sequence of letters per line. For example:
hwnuu
nhpgaucah
zfbylzt
hwnc
gicgwkhStats:
Text file size: 892K
Serialized file size: 1.1MB
Time to read from text file: 795ms
Time to read from serialized file: 1216ms -
Reading in an array from a text file
I'm trying to use a text file to load in some configuratin
data (using actionscript 3) I have it working ok for simple stuff
like gamename=Chess&gamescore=100 , etc... but some of the data
needs to be in an array. Can someone please point me in the right
direction to how I can read in an array from a text file?
Thanks!the easiest way is to create a string with the (soon-to-be)
array elements separated by a delimiter (like a double comma). read
in your string, then use the split() method of strings to split
your string into an array. -
How can we generate the reports in html or text file formats?
Hi,
Is there any package that can help in creating HTMLDB reports in .txt files or .html files? (Similar to TEXT_IO in Oracle Forms)
How can we generate the reports in html or text file formats from HTMLDB?
Thanks in Advance
RenjithHello all.
Bi Publisher is great, but has a very high price tag. It's even more expensive than Forms & Reports Services. We are considering APEX to replace Forms & Reports on the web, but the reporting limitations are still a problem.
I wonder if there is another option.
Thanks -
How can I remove the blue background from my PDFs files
How can I remove the blue background from my PDFs files
Which tutorial?
Answers are in your HTML and CSS code. What is the link to your online test page?
Nancy O. -
How can I read a line of numbers in a file?
Hello everybody,
I have a ziped.file organized in this way:
number1 number 2 number3 name1, name2, name3
number_of points information_about_number_of_point
number4 number4 number4 number4
number4 number4 number4 number4
number4 number4
number5 number5 number5 number5 number5 number5
number5 number5 number5 number5 number5 number5
number5 number5 number6 number6 number6 number6
number6 number6 number6 number6 number6 number6
number6 number6
My problem is to save number1 number 2 number3 and in number_of points in 3 different variable, and number4 number5 and number 6 in 3 different array. How can I do this?
The beginning of my file is:
10000 3.50000 0.00000 Teff, logg, [M/H]
52790 number of wavelength points
1.000000000000000e+01 1.200000000000000e+01 1.400000000000000e+01 1.600000000000000e+01 (end of3th line)
1.800000000000000e+01 2.000000000000000e+01 2.200000000000000e+01 2.400000000000000e+01 (end of 4th line)
The number 52790 is the same for number4, number 5 and number6.
Number4 are organized in 4 columns, number5 and 6 in 6 coloums and the spacing is always the same.
Could you help me please?Thank you and sorry for my terrible english!I'm not sure if I understand completely, but basically you just need to read & parse your files.
Use a lexer/parser tool like JavaCC if it's advanced parsing, or if it's something very simple (like assigning variables) then you can just use the String.split() method to break up your file into tokens. See below for examples of the "simple way"...
If you have any questions, don't hesitate to ask!
I need to save my informazioni in this way:
var1=number1
var2=number2
var3=number3If you wish to access these variables in a Java program, you could split up your file into tokens and then place the values in a map (variable/value pairs). I don't know how efficient this is, but it works nicely. You can change this for arrays, objects, etc.. right now it's only set up for ints.
Here's a very simple example with some code. Below is the text file...
my_var = 123
my_age = 16
x_pos = 2
err=2 //syntax error. must separate tokens with whitespaceTo get your variables from the text file:
Map<String, Integer> map;
//read text file and put it into string
//then use tokenExample to get a Map for that string
map = tokenExample(textfileString); //see below
//and finally assign your variables
int my_var = map.get("my_var");
int my_age = map.get("my_age");
int x_pos = map.get("x_pos");
The tokenExample(String) method
This method breaks the speified string into tokens, and returns a Map with all of the variable name/value pairs in the string.
public static Map<String, Integer> tokenExample(String text) {
//Sets up our tokens.
final String ASSIGN = "=";
final String NUMBER = "\\d+";
final String VARIABLE = "[a-zA-Z]([a-zA-Z]|_|[0-9])*";
//Map for our variable/value pairs
Map<String, Integer> variables = new Hashtable<String, Integer>();
String[] splitText = text.split("\\s+"); //Splits by whitespace
String varName = null;
boolean assigning = false;
//cycles through each token and decides what to do
for(String value : splitText) {
//if it's a variable, we set up it's name for later
if (value.matches(VARIABLE)) {
varName = value;
//if it's an assignment operator, we get ready to assign the variable
else if (value.matches(ASSIGN)) {
assigning = true;
//if it's a number, we put it into our hashmap
else if (value.matches(NUMBER)) {
//if there's no problem with the last two tokens
if (varName!=null & assigning==true) {
variables.put(varName, Integer.parseInt(value));
assigning=false; //reset for next time
varName=null;
//some sort of syntax error
else {
assigning=false;
varName=null;
System.err.println("Syntax error: cannot find token "+value);
}//end loop
return variables;
}See also:
http://mindprod.com/jgloss/regex.html
http://java.sun.com/docs/books/tutorial/extra/regex/
http://www.javaregex.com/tutorial.html -
How to input data into an arraylist from a text file?
I am trying to take data from a text file and put that data into an arraylist. First here is the text file:
[item1, 10, 125.0, item2, 10, 12.0, item3, 20, 158.0]
3
4530.0
[item5, 65, 555.5, item4, 29, 689.0]
2
56088.5
[item7, 84, 34.5, item6, 103, 0.5, item8, 85, 1.36]
3
3065.1The text between the [ ] is the output from my arraylists. I have three arraylists. The first [ ] belongs to arraylist A, the second to arraylist B, and the third to arraylist C. The format of the arraylists is this:
<item name>,<# in stock>,<value of one item>
The first number below the arraylists in the text file represents the number of items in the list. The second number below the arraylists represents the total value of the items in the arraylists.
Here is the class file I have (yes, it does everything):
import java.io.*;
import java.util.Scanner;
import java.util.ArrayList;
public class Inventory extends Object
public int toAdd = 0;
private boolean done = false; //Are we done yet?
public String strItemName; //The name of the item type.
public int intNumInStock; //The number in stock of that type.
public double dblValueOfOneItem; //The value of one item.
public String strNumberInStock;
public double dblTotalValueA; //The total value of warehouse A.
public double dblTotalValueB; //The total value of warehouse B.
public double dblTotalValueC; //The total value of warehouse C.
public int intWarehouseAItemCount; //Counter for items in warehouse A.
public int intWarehouseBItemCount; //Counter for items in warehouse B.
public int intWarehouseCItemCount; //Counter for items in warehouse C.
ArrayList warehouseAList = new ArrayList(); //Create the Warehouse A ArrayList.
ArrayList warehouseBList = new ArrayList(); //Create the Warehouse B arrayList.
ArrayList warehouseCList = new ArrayList(); //Create the Warehouse C arrayList.
/** Construct a new Inventory object. */
public Inventory()
super();
/**Add items to the Warehouse A ArrayList.*/
private void createWareHouseA()
System.out.println("!" + toAdd + " item types will be added to warehouse A.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseAList : " +
warehouseAList.size());
//Add items to the array List
warehouseAList.add(this.strItemName);
warehouseAList.add(this.strNumberInStock);
warehouseAList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseAList.size());
/**Add items to the Warehouse B ArrayList.*/
private void createWareHouseB()
System.out.println("!" + toAdd + " item types will be added to warehouse B.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseBList : " +
warehouseBList.size());
//Add items to the array List
warehouseBList.add(this.strItemName);
warehouseBList.add(this.strNumberInStock);
warehouseBList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseBList.size());
/**Add items to the Warehouse C ArrayList.*/
private void createWareHouseC()
System.out.println("!" + toAdd + " item types will be added to warehouse C.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseCList : " +
warehouseCList.size());
//Add items to the array List
warehouseCList.add(this.strItemName);
warehouseCList.add(this.strNumberInStock);
warehouseCList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseCList.size());
/**Interpret the commands entered by the user.*/
public void cmdInterpreter()
this.displayHelp();
Scanner cin = new Scanner(System.in);
while (!this.done)
System.out.print(">");
//"line" equals the next line of input.
String line = cin.nextLine();
this.executeCmd(line);
/**Execute one line entered by the user.
* @param cmdLN; The command entered by the user to execute. */
private void executeCmd(String cmdLN)
Scanner line = new Scanner(cmdLN);
if (line.hasNext())
String cmd = line.next();
//What to do when users enter the various commands below.
if (cmd.equals("help"))
this.displayHelp();
else if (cmd.equals("Q!"))
this.done = true;
else if (cmd.equals("F") && line.hasNext())
this.inputFromFile(line.next());
else if (cmd.equals("K") && line.hasNext())
int numItemsToAdd = Integer.valueOf( line.next() ).intValue();
this.toAdd = numItemsToAdd;
this.inputFromKeyboard(numItemsToAdd);
/**What to do if input comes from a file.
* @param inputFile; The name of the input file to process.*/
private void inputFromFile(String inputFile)
Scanner cin = new Scanner(System.in);
System.out.println("!Using input file " + inputFile + ".");
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
System.out.println("!Using output file " + outputFile + ".");
try
BufferedReader in = new BufferedReader(new FileReader(inputFile));
//Scanner in = new Scanner(new File(inputFile));
//Initialize the String variables.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
String line7 = null;
String line8 = null;
String line9 = null;
System.out.println(in.equals(",") + " see?");
//System.out.println((char)(char)in.read() + " experiment");
/**This loop assigns values to the string variables based on the
* values on each line in the input file. */
while(in.readLine() != null)
line1 = in.readLine();
line2 = in.readLine();
line3 = in.readLine();
line4 = in.readLine();
line5 = in.readLine();
line6 = in.readLine();
line7 = in.readLine();
line8 = in.readLine();
line9 = in.readLine();
//Print the contents of each line in the input file.
System.out.println("!value of line 1: " + line1);
System.out.println("!value of line 2: " + line2);
System.out.println("!value of line 3: " + line3);
System.out.println("!value of line 4: " + line4);
System.out.println("!value of line 5: " + line5);
System.out.println("!value of line 6: " + line6);
System.out.println("!value of line 7: " + line7);
System.out.println("!value of line 8: " + line8);
System.out.println("!value of line 9: " + line9);
/**Add items to the warehouses.*/
warehouseAList.add(line1);
warehouseBList.add(line4);
warehouseCList.add(line7);
/**Add the item count and total value for warehouse A.*/
int intLine2 = Integer.valueOf(line2).intValue();
this.intWarehouseAItemCount = intLine2;
double dblLine3 = Double.valueOf(line3).doubleValue();
this.dblTotalValueA = dblLine3;
/**Add the item count and total value for warehouse B.*/
int intLine5 = Integer.valueOf(line5).intValue();
this.intWarehouseBItemCount = intLine5;
double dblLine6 = Double.valueOf(line6).doubleValue();
this.dblTotalValueB = dblLine6;
/**Add the item count and total value for warehouse C.*/
int intLine8 = Integer.valueOf(line8).intValue();
this.intWarehouseCItemCount = intLine8;
double dblLine9 = Double.valueOf(line9).doubleValue();
this.dblTotalValueC = dblLine9;
/**Ask the user how many items to add or delete from inventory.*/
System.out.print("Enter the number to add to inventory for " +
warehouseAList.get(0) + ":");
String toAddOrDel = cin.next();
/**Print the contents of all the warehouses. */
System.out.println(" ");
//Print the contents of warehouse A.
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse A:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse A.
System.out.println(warehouseAList);
//Print the total amount of items in warehouse A.
System.out.println("Total items: " + this.intWarehouseAItemCount);
//Print the total value of the items in warehouse A.
System.out.println("Total value: " + this.dblTotalValueA);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse B:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse B.
System.out.println("!warehouseB: " + warehouseBList);
//Print the total amount of items in warehouse B.
System.out.println("Total items: " + this.intWarehouseBItemCount);
//Print the total value of the items in warehouse B.
System.out.println("Total value: " + this.dblTotalValueB);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse C:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse C.
System.out.println("!warehouseC: " + warehouseCList);
//Print the total amount of items in warehouse C.
System.out.println("Total items: " + this.intWarehouseCItemCount);
//Print the total value of the items in warehouse C.
System.out.println("Total value: " + this.dblTotalValueC);
in.close();
catch (FileNotFoundException e)
System.out.println("!Error: Unable to open file for reading.");
catch (EOFException e)
System.out.println("!Error: EOF encountered, file may be corrupted.");
catch (IOException e)
System.out.println("!Error: Cannot read from file.");
/**What to do if input comes from the keyboard.
* @param numItems; The total number of items that will be added to the
* Warehouse(s). */
public void inputFromKeyboard(int numItems)
System.out.println("!You will be adding " + numItems + " items to " +
"inventory from the keyboard. ");
this.toAdd = numItems;
Scanner cin = new Scanner(System.in);
//Prompt user for name of output file.
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
/**This loop asks the user for information about the item(s) and inputs
*them into the appropriate array.*/
int count = 0;
while (numItems > count)
//Item name.
System.out.print("!Item name: ");
String addItemName = cin.next();
//Number in stock.
System.out.print("!Number in stock: ");
String addNumInStock = cin.next();
//Initial warehouse.
System.out.print("!Initial warehouse(A,B,C): ");
String addInitWarehouse = cin.next();
//Value of one item.
System.out.print("!Value of one item: ");
String addValueOfOneItem = cin.next();
//Add or delete from inventory
System.out.print("!Enter amount to add or delete from inventory: ");
String strAddOrDelete = cin.next();
System.out.println("!Amount to add or delete: " + strAddOrDelete);
//Cast
int intAddNumInStock = Integer.valueOf(addNumInStock).intValue();
double doubleAddValueOfOneItem = Double.valueOf(addValueOfOneItem).doubleValue();
int intAddOrDelete = Integer.valueOf(strAddOrDelete).intValue();
/**Add intAddNumInStock with intAddOrDelete to determine the amount
* to add or delete from inventory (If a user wishes to remove items
* from inventory simply add negative values). */
intAddNumInStock = intAddNumInStock + intAddOrDelete;
System.out.println("!Inventory after modifications: " + strAddOrDelete);
this.strItemName = addItemName;
this.intNumInStock = intAddNumInStock;
this.dblValueOfOneItem = doubleAddValueOfOneItem;
//Put items into warehouse A if appropriate.
if (intAddNumInStock < 25)
//Increment the warehouse A item count.
this.intWarehouseAItemCount = this.intWarehouseAItemCount + 1;
//Calculate the total value of warehouse A.
this.dblTotalValueA = this.dblTotalValueA + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse A array list.
this.createWareHouseA();
//Put items into warehouse B if appropriate.
if (intAddNumInStock >= 25)
if (intAddNumInStock < 75)
//Increment the warehouse B item count.
this.intWarehouseBItemCount = this.intWarehouseBItemCount + 1;
//Calculate the total value of warehouse B.
this.dblTotalValueB = this.dblTotalValueB + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse B array list.
this.createWareHouseB();
//Put items into warehouse C if appropriate.
if (intAddNumInStock >= 75)
//Increment the warehouse C item count.
this.intWarehouseCItemCount = this.intWarehouseCItemCount + 1;
//Calculate the total value of warehouse C.
this.dblTotalValueC = this.dblTotalValueC + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse C array list.
this.createWareHouseC();
//display helpful information.
System.out.println("!--------------------------------");
System.out.println("!" + addItemName + " is the item name.");
System.out.println("!" + addNumInStock + " is the number in stock.");
System.out.println("!" + addInitWarehouse + " is the initial warehouse.");
System.out.println("!" + addValueOfOneItem + " is the value of one item.");
System.out.println("!--------------------------------------------------");
//Increment the counters.
count++;
/**Create and write to the output file. */
try
//Use the output file specified by the user.
PrintWriter out = new PrintWriter(outputFile);
/**Write warehouse A details.*/
//Blank the first line.
out.println(" ");
//Write the array list for warehouse A.
out.println(warehouseAList);
//Write the amount of items in warehouse A.
out.println(intWarehouseAItemCount);
//Write the total value for warehouse A.
out.println(dblTotalValueA);
/**Write warehosue B details.*/
//Write the array list for warehouse B.
out.println(warehouseBList);
//Write the amount of items in warehouse B.
out.println(intWarehouseBItemCount);
//Write the total value for warehouse B.
out.println(dblTotalValueB);
/**Write warehouse C details.*/
//Write the array list for warehouse C.
out.println(warehouseCList);
//Write the amount of items in warehouse C.
out.println(intWarehouseCItemCount);
//Write the total value for warehouse C.
out.println(dblTotalValueC);
//Close the output file.
out.close();
catch (FileNotFoundException e)
System.out.println("Error: Unable to open file for reading.");
catch (IOException e)
System.out.println("Error: Cannot read from file.");
/**View the contents and the value of each warehouse.*/
System.out.println("!---------------Inventory Summary------------------");
System.out.println("!--------------------------------------------------");
System.out.println("!--------------------LEGEND:-----------------------");
System.out.println("!<item type>, <amount in stock>,<value of one item>");
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse A:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse A.
System.out.println(warehouseAList);
//Total items in warehouse A.
System.out.println("Total items: " + intWarehouseAItemCount);
//Display total value of warehouse A.
System.out.println("Total value: " + "$" + dblTotalValueA);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse B:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse B.
System.out.println(warehouseBList);
//Total items in warehouse B.
System.out.println("Total items: " + intWarehouseBItemCount);
//Display total value of warehouse B.
System.out.println("Total value: " + "$" + dblTotalValueB);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse C:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse C.
System.out.println(warehouseCList);
//Total items in warehouse C.
System.out.println("Total items: " + intWarehouseCItemCount);
//Display total value of warehouse C.
System.out.println("Total value: " + "$" + dblTotalValueC);
/**Display a help message.*/
private void displayHelp()
System.out.println("!--------------------------------");
System.out.println("! General Help:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'help' display this help message.");
System.out.println("!'Q!' quit this program.");
System.out.println("!--------------------------------");
System.out.println("! Input File Specific Commands:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'F' <name> type F followed by the name of the " +
"file to be used for input.");
System.out.println("!---------------------------------------");
System.out.println("! Input From Keyboard Specific Commands:");
System.out.println("!---------------------------------------");
System.out.println("! ");
System.out.println("!'K' <number> type K followed by the number of " +
"items that will be added. ");
System.out.println("! ");
}Program file:
public class InventoryProg
public static void main(String[] args)
//Create a new Inventory object.
Inventory test = new Inventory();
//Execute the command interpreter.
test.cmdInterpreter();
}Right now I am stuck on this and I cannot progress any further until I figure out how to input the data in the text file back into a arraylist.
Thanks in advance.Thanks but I figured it out. Heres a sample of the code i used to solve my problem:
try
//Warehouse A BufferedReader.
BufferedReader inA = new BufferedReader(new FileReader(inputFileWarehouseA));
//Warehouse B BufferedReader.
BufferedReader inB = new BufferedReader(new FileReader(inputFileWarehouseB));
//Warehouse C BufferedReader.
BufferedReader inC = new BufferedReader(new FileReader(inputFileWarehouseC));
//Warehouse details BufferedReader.
BufferedReader inDetails = new BufferedReader(new FileReader(inputFileDetails));
//Will hold values in warehouse arraylists.
String lineA = null;
String lineB = null;
String lineC = null;
//Will hold the details of each warehouse.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
//Get the item count and total value for each warehouse.
while(inDetails.readLine() != null)
line1 = inDetails.readLine();
line2 = inDetails.readLine();
line3 = inDetails.readLine();
line4 = inDetails.readLine();
line5 = inDetails.readLine();
line6 = inDetails.readLine();
/**Assign the item count and total value to warehouse A.*/
//Cast.
int intLine1 = Integer.valueOf(line1).intValue();
double dblLine2 = Double.valueOf(line2).doubleValue();
//Assign the values.
this.intWarehouseAItemCount = intLine1;
this.dblTotalValueA = dblLine2;
/**Assign the item count and total value to warehouse B.*/
//Cast.
int intLine3 = Integer.valueOf(line3).intValue();
double dblLine4 = Double.valueOf(line4).doubleValue();
//Assign the values.
this.intWarehouseBItemCount = intLine3;
this.dblTotalValueB = dblLine4;
/**Assign the item count and total value to warehouse C.*/
//Cast.
int intLine5 = Integer.valueOf(line5).intValue();
double dblLine6 = Double.valueOf(line6).doubleValue();
//Assign the values.
this.intWarehouseCItemCount = intLine5;
this.dblTotalValueC = dblLine6;
/**Put the items back into the warehouses arraylists. */
//Add items to warehouse A.
while((lineA = inA.readLine()) != null)
warehouseAList.add(lineA);
//Add items to warehouse B.
while((lineB = inB.readLine()) != null)
warehouseBList.add(lineB);
//Add items to warehouse C.
while((lineC = inC.readLine()) != null)
warehouseCList.add(lineC);
}(this isn't the whole try statement its pretty long)
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