Store boolean array as text file

Hi there
I'm having some trouble storinge a 25x25 2D array of booleans in a text file.
First I make the 2D array a 1D array, and then I change it to a number, but here something already goes wrong, not the full number is stored, presumably because the array is this big?
Any help will be much appreciated!
Solved!
Go to Solution.
Attachments:
Store 2D boolean array LV10.vi ‏17 KB

You can also convert the 2D boolean array into 1D array of numbers and save to text file and then read back to load the original 2D Boolean array
The best solution is the one you find it by yourself
Attachments:
2D Boolean to String.vi ‏16 KB

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Write Text Data Array to text file

Greetings all. I hope someone can help me as I am really under the gun. The attached vi shows the basics of what I am trying to do. I have already written a vi that takes the Cal Data Array and prints it out in a nicely formatted report. My problem is that the powers that be also want the data saved to a generic text file that can be copied and printed out anywhere they like. As such, I need to save the data to a generic text file in column format such that it will all fit on one page in landscape mode. There are a total of 12 columns of data. I have been trying to create something that would format each column to a specific length instead of them all being the same. No luck so far. Basically, I need columns 1,2,3,8 and 12 to be length of 5. The rest a length of 9. I have tried to place the formatting part in a for loop with the formatting in a case, but it does not appear to work. I really need this quick so if anyone has any ideas, please help. As always, I really appreciate the assistance.
Thanks,
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Attachments:
Write Cal Data to Text File.vi ‏21 KB

pincpanter's is a good solution. Beat me to it while I was away building an example. Similiar approach using two for loops and case statement. Here is my suggestion anyway....
cheers
David
Message Edited by David Crawford on 11-23-2005 09:37 AM
Attachments:
Write Text Data Array to text file.vi ‏31 KB

Using ArrayList to store Lines in a text File

Hey Guys,
I have the following program that I am using to read a text file and store each word in each line in an ArrayList. But I am getting the following error;
Exception in thread "main" java.util.ConcurrentModificationException
     at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
     at java.util.AbstractList$Itr.next(AbstractList.java:420)
     at bus.OrderReader.parseLine(OrderReader.java:50)
     at bus.OrderReader.main(OrderReader.java:32) The code is as follows;
package bus;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;
import java.util.Collection;
import java.util.ArrayList;
import java.util.Iterator;
public class OrderReader {
    static Collection bread = new ArrayList();
    static Collection filling = new ArrayList();
    static Iterator iter1 = filling.iterator();
    static Iterator iter2 = bread.iterator();
     private static int counter;
public static void main(String args[]){
    Scanner s = null;
    try {
        s = new Scanner(new BufferedReader(new FileReader("/Users/admin/Documents/workspace2/OBS/WebContent/WriteMe.txt")));
        s.useDelimiter("\r");
        while(s.hasNext()) {
            parseLine(s.next());
            counter++;
        s.close();
    catch(FileNotFoundException e) {
        System.out.println("cannot find the file");
        //ignore for now
    public static void parseLine(String line) {
        Scanner lineScanner = new Scanner(line);
        lineScanner.useDelimiter("#");
            bread.add(lineScanner.next());
            filling.add(lineScanner.next());
            System.out.println(iter1.next());
            System.out.println(iter2.next());
}I do not understand why this does not work. Can someone please point me in the right direction?
Thank You
Jaz

Instead of doing this:
bread.add(lineScanner.next());
filling.add(lineScanner.next());
System.out.println(iter1.next());
System.out.println(iter2.next());where presumably you're just printing what you just
barely added, do this:
Object breadObject = lineScanner.next();
Object fillingObject = lineScanner.next();
bread.add(breadObject);
filling.add(fillingObject);
System.out.println(breadObject);
System.out.println(fillingObject);
And get rid of the now unused iterators.Im not sure I understand quiet what is happening here. Are you creating a primitive data type of type Object and then storing all the values in that variable?
why would I do this when this only allows me to view the very last element that was added to the list? I want to view the entire list.
Thanks
Jaz
Message was edited by:
DontKnowJack

How to Store something in a text file.

Store the record of the session in a text file.
please can any one tell me how can i create this thing.
i cerate the button but does not work correctly and i can not save any calculation/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Math.*;
import java.math.BigInteger;
public class Calculator2 extends JFrame implements ActionListener{
JLabel lN1, lN2,lN3;//here are the Label.
JTextField tN1, tN2;// here the place for the text field.
JButton btnAdd,btnSub,btnMul,btnDiv,btnClear,btnSave; JTextArea outArea;//all our Button which are in the program.
Calculator2(){//constructor.
Box box=Box.createVerticalBox();//creation of the box.
// input
lN1=new JLabel("Write first number"); box.add(lN1);//creation of the input,the number which we want use.
tN1=new JTextField(100); tN1.setEditable(true); box.add(tN1);//allows or prevents the user editing the text
lN2=new JLabel("write second number"); box.add(lN2);
tN2=new JTextField(100); tN2.setEditable(true); box.add(tN2);
// buttons
btnAdd=new JButton("+"); btnAdd.addActionListener(this); box.add(btnAdd);// button of addition operation
// setPreferredSize();
btnSub=new JButton("-"); btnSub.addActionListener(this); box.add(btnSub);// button of subtraction operation
btnMul=new JButton("*"); btnMul.addActionListener(this); box.add(btnMul);// button of multiplication operation
btnDiv=new JButton("/"); btnDiv.addActionListener(this); box.add(btnDiv);// button of division operation
btnClear=new JButton("Clear"); btnClear.addActionListener(this); box.add(btnClear);// button of Clear operation
btnSave=new JButton("Save"); btnSave.addActionListener(this); box.add(btnSave);// button of save operation
// Output
String desc="This is a simple integer calculator\n";//here the out put with text area.
outArea=new JTextArea(desc,30,60);//out put area with the hight and length.
ScrollPane scrollPane=new ScrollPane();//Creates an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed
scrollPane.add(outArea);
box.add(scrollPane);
Container c=getContentPane();
c.add(box);
c.setBackground(Color.green);//back ground color.
setTitle("Calculator");//title
setSize(600,375);//size
setVisible(true);// visiblity of the program.
private void showStatus(String status) {
lN3.setText(status);
public void actionPerformed(ActionEvent actionEvent){
if(actionEvent.getSource()==btnClear){
outArea.selectAll(); outArea.cut();
} else {
String sN1=tN1.getText(), sN2=tN2.getText(), sOp="";
BigInteger bN1=new BigInteger(sN1);
BigInteger bN2=new BigInteger(sN2);
BigInteger bRes=BigInteger.ZERO, bResDiv[]={BigInteger.ZERO,BigInteger.ZERO};
BigInteger bRemainder=BigInteger.ZERO;
if(actionEvent.getSource()==btnAdd){bRes=bN1.add(bN2); sOp=" + ";}
if(actionEvent.getSource()==btnSub){bRes=bN1.subtract(bN2); sOp=" - ";}
if(actionEvent.getSource()==btnMul){bRes=bN1.multiply(bN2); sOp=" * ";}
if(actionEvent.getSource()==btnDiv){sOp=" / ";
            if(bN2.signum()!=0)bResDiv=bN1.divideAndRemainder(bN2);//Math.signum() tells you what sign a number is....
            //returns zero if the argument is zero, 1.0 if the argument is greater than zero,
            //-1.0 if the argument is less than zero
            bRes=bResDiv[0]; bRemainder=bResDiv[1];
if(sOp.equals(" / ") && bN2.signum()==0){
// showStatus("Cannot divide by zero");
} else {
outArea.append(bN1.toString() + sOp+bN2.toString() + " = " + bRes.toString() + "\n");
if(actionEvent.getSource()==btnDiv)outArea.append("Remainder = "+bRemainder.toString()+"\n");
public static void main(String[] args) {//the main method of the program.
new Calculator2().setVisible(true);
}

// This is a simple calculator that calculate 4 mathematical operations, addition,
// subtraction, multiplication and division.
// Author: Jean Chedid.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Math.*;
import java.math.BigInteger;
public class Calculator2 extends JFrame implements ActionListener{
    JLabel lN1, lN2,lN3;//here are the Label.
    JTextField tN1, tN2;// here the place for the text field.
    JButton btnAdd,btnSub,btnMul,btnDiv,btnClear,btnSave; JTextArea outArea;//all our Button which are in the program.
    Calculator2(){//constructor.
        Box box=Box.createVerticalBox();//creation of the box.
        // input
        lN1=new JLabel("Write first number"); box.add(lN1);//creation of the input,the number which we want use.
        tN1=new JTextField(100); tN1.setEditable(true); box.add(tN1);//allows or prevents the user editing the text
        lN2=new JLabel("write second number"); box.add(lN2);
        tN2=new JTextField(100); tN2.setEditable(true); box.add(tN2);
        // buttons
        btnAdd=new JButton("+"); btnAdd.addActionListener(this); box.add(btnAdd);// button of addition operation
        // setPreferredSize();
        btnSub=new JButton("-"); btnSub.addActionListener(this); box.add(btnSub);// button of subtraction operation
        btnMul=new JButton("*"); btnMul.addActionListener(this); box.add(btnMul);// button of multiplication operation
        btnDiv=new JButton("/"); btnDiv.addActionListener(this); box.add(btnDiv);// button of division operation
        btnClear=new JButton("Clear"); btnClear.addActionListener(this); box.add(btnClear);// button of Clear operation
        btnSave=new JButton("Save"); btnSave.addActionListener(this); box.add(btnSave);// button of save operation
        // Output
        String desc="This is a simple integer calculator\n";//here the out put with text area.
        outArea=new JTextArea(desc,30,60);//out put area with the hight and length.
        ScrollPane scrollPane=new ScrollPane();//Creates an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed
        scrollPane.add(outArea);
        box.add(scrollPane);
        Container c=getContentPane();
        c.add(box);
        c.setBackground(Color.green);//back ground color.
        setTitle("Calculator");//title
        setSize(600,375);//size
        setVisible(true);// visiblity of the program.
     private void showStatus(String status) {
     lN3.setText(status);
    public void actionPerformed(ActionEvent actionEvent){
        if(actionEvent.getSource()==btnClear){
            outArea.selectAll(); outArea.cut();
        } else {
            String sN1=tN1.getText(), sN2=tN2.getText(), sOp="";
            BigInteger bN1=new BigInteger(sN1);
            BigInteger bN2=new BigInteger(sN2);
            BigInteger bRes=BigInteger.ZERO, bResDiv[]={BigInteger.ZERO,BigInteger.ZERO};
            BigInteger bRemainder=BigInteger.ZERO;
            if(actionEvent.getSource()==btnAdd){bRes=bN1.add(bN2); sOp=" + ";}
            if(actionEvent.getSource()==btnSub){bRes=bN1.subtract(bN2); sOp=" - ";}
            if(actionEvent.getSource()==btnMul){bRes=bN1.multiply(bN2); sOp=" * ";}
            if(actionEvent.getSource()==btnDiv){sOp=" / ";
            if(bN2.signum()!=0)bResDiv=bN1.divideAndRemainder(bN2);//Math.signum() tells you what sign a number is....
            //returns zero if the argument is zero, 1.0 if the argument is greater than zero,
            //-1.0 if the argument is less than zero
            bRes=bResDiv[0]; bRemainder=bResDiv[1];
            if(sOp.equals(" / ") && bN2.signum()==0){
                // showStatus("Cannot divide by zero");
            } else {
                outArea.append(bN1.toString() + sOp+bN2.toString() + " = " + bRes.toString() + "\n");
                if(actionEvent.getSource()==btnDiv)outArea.append("Remainder = "+bRemainder.toString()+"\n");
    public static void main(String[] args) {//the main method of the program.
        new Calculator2().setVisible(true);
}

Read in array from text file

hello,
i have managed to save the content of a 2d array to a text file, but i am a bit stuck reading it back and placing the data back into a 2d array.
i have a Scanner object that can read the the integers from the file using nextInt(), but i am not sure how to place them back into the 2d array.
i need something like:
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thanks

morris7 wrote:
but it doesnt like the for loop.1) You'll have to be much more specific than this if you want "helpful" help.
2) You may need to call inputStream.nextLine() after the inner for loop but inside the outer for loop.
3) Always, always use curly brackets "{" and "}" to enclose your for loops, while loops, if and else statements. They may seem like extra work if you are only processing one line, but they will save your life someday. Always.
4) Consider closing your scanner in a finally block.

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Hi All,
powershell script Method required to read a value from registry and then taking the backup of that values in some text file.
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I think you need to read this first:
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Hi,
Ti load:
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(We would also need to know your LabVIEW version. If you have a very old version, things would be quite different.)
As Smercurio_fc already mentioned, the option to "prepend array size" would make things much easier here, because then you would read it as a single 2D array.
Here's how that would look like. This is probably the recommended solution, just for simplicity reasons.
Not prepending the size is more useful if you write the data in increments, but later want to read it as one.
Message Edited by altenbach on 11-15-2008 09:02 AM
LabVIEW Champion . Do more with less code and in less time .
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SaveRestore2D.png ‏21 KB

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I have written code to store words in a text file. they appear in the text file as shown below.
word1
word2
word3
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try
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How do I read a text file line by line and store to array

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Well, you got the pseudo code:
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Hello
I have question and i do not know how to do this.
can any one explain for me how i can save something in a text file.
i create calculator,and there is one question i need to do it:((Store the record of the session in a text file. ))
what i need to write some codes and so on.
please can u give idea ?

Alena,
Here's my static FileUtilz class, which includes a writeFile method, and several other handy methods.
package krc.io;
import java.util.Collection;
import java.util.List;
import java.util.ArrayList;
import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.Arrays;
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      //compare contents (buffer by buffer)
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        inB = new FileInputStream(fileB);
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        byte[] bfrB = new byte[bfrSize];
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          sizeB = inA.read(bfrB);
          if ( sizeA != sizeB ) {
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          } else if ( sizeA == 0 ) {
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    public static String basename(String path, boolean cutExtension)
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        if (cutExtension) {
            int i = fname.lastIndexOf(".");
            if (i > 0) {
                fname = fname.substring(0,i);
        return fname;
    public static String dirname(String path)
        return (new File(path)).getParent();
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How to save input from a text file in to array

I got this assignment, and almost have no clue, and my teacher doesn't even teaches us anything
This is what i am suppose to do
5. The program must store the following data about each student in this Talent Show:
* The student's name (store as a String)
* The student's average time score [only for the events they competed in] (store as a Double)
Note: Some of the data comes directly from the text file, and some of the data must be calculated from the data that is read from the file.
6. The program must search through all of the student's scores to find the student who has the minumum average time of all students.
7. You must calculate how many events each student played. Zero values are not counted.
8. You must then generate a report on the screen that prints out
* the total number of students in the competition,
* the winning student's ...
o name
o times
o average time (rounded to one decimal places)
Sample output
btw this is the data file
Bart Simpson
7.5
12.3
7.8
19.2
9.9
5.3
8.5
11.8
2.2
4.6
Stewie Griffin
9.5
29.7
7.8
22.5
9.9
12.6
8.5
0
8.2
0
Pinky
2.5
0
1.8
0
3.9
0
6.5
0
5.2
12.1
Rocky N Bullwinkle
10.0
22.2
9.5
17.5
9.9
1.5
8.7
23.7
9.2
11.0
Angelica Pickles
5.5
11.1
6.8
12.2
7.9
13.3
8.1
5.1
7.2
7.9
Pink Panther
8.5
5.5
8.8
6.6
8.9
7.7
9.9
8.8
2.2
9.9
Josie
9.5
0
8.8
12.2
9.9
0
8.5
0
9.2
5.3
Rogue
8.5
1.1
7.8
2.2
7.9
3.3
7.5
4.4
8.2
5.5
Usagi Tsukino
8.5
15.5
8.8
30.1
9.9
19.7
9.5
11.0
8.2
8.6
Yosemite Sam
0
15.2
0
29.5
3.9
0
0
16.0
0
7.7
My code so far
import java.io.*;
public class test
    public static void main (String [] args)
        FileInputStream File1;
        DataInputStream In;
        String fileInput = "";
        try
           File1 = new FileInputStream ("data.txt");
            In = new DataInputStream (File1);
            while (In.available () > 0)
                fileInput = In.readLine ();
                System.out.println (fileInput);
            In.close ();
        catch (FileNotFoundException e)
            System.out.println ("Error - this file does not exist");
        catch (IOException e)
            System.out.println ("error=" + e.toString ());
}My question, how do i save the data in to an array, and how do i seperatly save names in to different array, and their scores in to different arrays
bte he said you can use scanner class
Thanks
Edited by: supahsain08 on Mar 26, 2008 2:55 PM

supahsain08 wrote:
Well, you are not in my class and you don't even know my teacher
who are you to judge meHe is jaded by our experiences here. 99% of posters who complain that the teacher doesn't teach have adequate (note that I didn't say good) teachers, but it's the student who is failing to take responsibility for his own education. It is after all your responsibility and complaining won't help you any.
Good luck.

Read a text file into array

Can anyone let me know how to get read the values column wise from the text file and put each column in each arrays.
for eg: if we have 4 columns in the text file then the values will be stored in 4 arrays.
Thanks in advance
Regards
Kutty

Use a two dimensional array to store your data, and use the StringTokenizer class to split up the lines as you read them in from the file.

Retrieving two dimensional arrays from a text file.

Good evening
I am having a problem with reading a text file, and putting this info into a 2D array to be put into a table.
I have the table already(but no code to add rows to the table incase the array increases)
The array is called Product[a][ b ]
where a is the product number(the row), and b are details about this product.
The file i want to be read looks like this:
data.txt
CPU|AMD|X2, 64bit, 2GHz|$150|9
Video card|NVidia|7800 GTX 256MB|$400|4
e.g. product[2][4] would equal 4
Basically: Type, manufacturer, specifications, price, amount in stock.
the "splitter" or "field terminator" is "|"
This is what i want it to do:
Store fileline into single string,
split string and put it in product[ j ][ i ]
repeat with next lines until nothing is read anymore.
This is the code I have so far:
try{
        FileReader textFileReader = new FileReader("C://BACKUP2//data.txt");
        BufferedReader textReader = new BufferedReader(textFileReader);
        for(int j=0; j<0; j++){
             for(int i=0; i<6; i++){ //i starts at 0, condition: i is under 6, 1 is added to i at each loop/update.
                   ProductT = textReader.readLine();
                   textReader.close();
                   for(String Product[j] : ProductT.split("|")){ //this line is completly wrong, but i don't know how else to do it.
     // for counting for the number of columns
catch (IOException e) {System.out.println(e);}
I don't even think this code makes any bloody sense, I don't know if I'm approaching it correctly.
Would anyone be gracious enough to give me a helping hand and tell me what/how to change my code?
from what I see, the problem lies less in the loops, but more in the splitting of the string. no function seems to like 2D arrays :(

So this is where I stand:
     //Reading
    try{
        FileReader textFileReader = new FileReader("C://BACKUP2//data.txt");
        BufferedReader textReader = new BufferedReader(textFileReader);
        for(int j=0; j>0; j++){ // this will go on forever now or what?
// yes, this will loop forever, which is fine as long as you break out of the loop when you reach the end of the file (which is indicated by textReader.readLine() returning null)
             // replace the for(String currentField : ProductT.split("|")) loop with this one
             //for(int i=0; i<6; i++){ //i starts at 0, condition: i is under 6, 1 is added to i at update.
                  String inputline = textReader.readLine();    // read a single line from the file each time through the loop
                  //while (inputline != null) {
                        if (inputline != null) {    // check if the end of the file has been reached
                       //ProductT = textReader.readLine(); //put to single string
                   //textReader.close(); //shut it off    // move this line to the end of processing, you don't want to close the file until you've read everything from it.
                   //for(String currentField : ProductT.split("|")){   //Split string...      according to JBuilder "The local variable currentField is never read"
                         // switch this loop to use the regular for( ; ; ) type, that way you will have another counter to use as the second index in the product assignment
                                     //currentField = Product[j];
                    product[i][] = currentField; // use the index of the second loop as the second index here
else {
break; // break out of the loop when end of file is reached
     //} // the for i etc. end here
} // End for j et cetera...
     } //end Try
catch (IOException e) {System.out.println(e);}
//cut the crap
// close the reader here
ok - so I am not quite sure about what you mean here
"Assign each of the 5 fields to the five [][j]
positions of the array. "
should i put 5 "fors" in there? - currently the
program is compiling - although they do not appear in
the table.I put comments in the code that should answer those questions.
The code for the table is
Object[][] data = {
          {Product[0][0], Product[0][1],
               Product[0][2], Product[0][3], Product[0][4]},
               {Product[1][0], Product[1][1],
Product[1][2], Product[1][3],
uct[1][3], Product[1][4]},
                      {Product[2][0], Product[2][1],
Product[2][2], Product[2][3],
ct[2][3], Product[2][4]},
                          {Product[3][0], Product[3][1],
Product[3][2],
Product[3][2], Product[3][3], Product[3][4]},
                {Product[4][0], Product[4][1],
Product[4][2],
Product[4][2], Product[4][3], Product[4][4]},
;If I do not declare any of these strings (e.g. I have
only declared Product[0-2][] oldschol style) an error
occurs, telling me that
Caused by:
java.lang.ArrayIndexOutOfBoundsException: 3
     at data.<init>(data.java:112)
     ... 5 more
When you declare product, you'll need to give it a size for both dimensions. The first dimension will be the number of lines to be read from the file. You'll need to know this before allocating the array, so either count them in the file, (if that's good enough for this assignment) or loop through the file once before reading it to count the lines. The second dimension of the array will be 5, since that's how many fields each line has.
btw; do I give those duke stars when all problems of
my life(currently: reading the two dimensional
string) have been resolved?I don't know about [i]all the problems of your life, but when the topic of the thread has been solved, then give them to whoever helped. :)

Store boolean array as text file

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