How to read a file and save the line number of the last line read?

Hi,
I am using RandomAccessFile and file as my class. I am trying to read a log file as it gets updated and print it out to a java window. i so far have the framework setup but dont know how to save the last line number so.
i need this variable so i dont reprint out the same line numbers to the java window. please advise.
thanks!

hi,
i now have the line number of the last line read, but now when i reopen the file, how can i skip that number of lines?
thanks,

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Read multiple files and save all into one output file(AGAIN)

Hi, guys
I need your help for reading data from multiple files and save the results into one output file. When files are selected from file chooser, my program read the data line by line , do some calculations and save the result into the output. I made an array to store input files and it seems to be working fine, but when it comes to SaveFile() function, issues NullPointException message.
public class FileReduction1 extends JFrame implements ActionListener
   // GUI definition and layout
    /* ACTION PERFORMED */
    public void actionPerformed(ActionEvent event) {
        if (event.getActionCommand().equals("Open File")) getFileName();
    /* OPEN THE FILE */
    private void getFileName() {
        // Display file dialog so user can select file to open
     JFileChooser fileChooser = new JFileChooser();
     fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        fileChooser.setMultiSelectionEnabled(true);
     int result = fileChooser.showOpenDialog(this);
     // If cancel button selected return
     if (result == JFileChooser.CANCEL_OPTION) return;
        if (result == JFileChooser.APPROVE_OPTION)
         files = fileChooser.getSelectedFiles();
            textArea.setText("");
            if(files.length>0)
                filelist="";
                System.out.println("files length"+files.length);
                for(int i=0;i<files.length;i++)
                     System.out.println(files.getName());
filelist+=files[i].getName()+" ,";
if (checkFileName(files[i]) )
openButton.setEnabled(true);
readButton.setEnabled(true);
textArea.append("file "+files[i].getName()+"is a proper file"+"\n");
readFile(files[i]);
textfield.setText(filelist);
else{JOptionPane.showMessageDialog(this,"Please select file(s)",
                "Error 5: ",JOptionPane.ERROR_MESSAGE); }
     // Obtain selected file
/* READ FILE */
private void readFile(File fileName_in) {
// Disable read button
readButton.setEnabled(false);
// Dimension data structure
     getNumberOfLines(fileName_in);
     data = new String[numLines][4];
     // Read file
     readTheFile(fileName_in);
     // Rnable open button
     openButton.setEnabled(true);
/* GET NUMBER OF LINES */
/* Get number of lines in file and prepare data structure. */
private void getNumberOfLines(File fileName_in) {
int counter = 0;
     // Open the file
     openFile(fileName_in);
     // Loop through file incrementing counter
     try {
     String line = fileInput.readLine();
     while (line != null) {
     counter++;
          System.out.println("(" + counter + ") " + line);
line = fileInput.readLine();
     numLines = counter;
closeFile(fileName_in);
     catch(IOException ioException) {
     JOptionPane.showMessageDialog(this,"Error reading File",
               "Error 5: ",JOptionPane.ERROR_MESSAGE);
     closeFile(fileName_in);
     System.exit(1);
/* READ FILE */
private void readTheFile(File fileName_in)
// Open the file
//int row=0;
int col=0;
openFile(fileName_in);
System.out.println("Read the file");
// Loop through file incrementing counter
try
String line = fileInput.readLine();
while (line != null)
boolean containsDoubles = false;
double temp;
String[] lineParts = line.split("\t");
try
for (col=0;col<lineParts.length;col++)
temp=Double.parseDouble(lineParts[col]);
data[row][col] = lineParts[col];
containsDoubles = true;
System.out.print("data["+row+"]["+col+"]="+lineParts[col]+" ");
} catch (Exception e) {row=0; col=0; temp=0.0;}
if (containsDoubles){ row++;}
System.out.println();
line = fileInput.readLine();
catch(IOException ioException)
JOptionPane.showMessageDialog(this,"Error reading File", "Error 5: ",JOptionPane.ERROR_MESSAGE);
closeFile(fileName_in);
System.exit(1);
//System.out.println("length"+data.length);
closeFile(fileName_in);
process(fileName_in);
/* CHECK FILE NAME */
/* Return flase if selected file is a directory, access is denied or is
not a file name. */
private boolean checkFileName(File fileName_in) {
     if (fileName_in.exists()) {
     if (fileName_in.canRead()) {
          if (fileName_in.isFile()) return(true);
          else JOptionPane.showMessageDialog(null,
                    "ERROR 3: File is a directory");
     else JOptionPane.showMessageDialog(null,
                    "ERROR 2: Access denied");
     else JOptionPane.showMessageDialog(null,
                    "ERROR 1: No such file!");
     // Return
     return(false);
/* OPEN FILE */
private void openFile(File fileName_in) {
     try {
     // Open file
     FileReader file = new FileReader(fileName_in);
     fileInput = new BufferedReader(file);
     catch(IOException ioException) {
     JOptionPane.showMessageDialog(this,"Error Opening File",
               "Error 4: ",JOptionPane.ERROR_MESSAGE);
     textArea.append("OPEN FILE\n---------\n");
     textArea.append(fileName_in.getPath());
     textArea.append("\n");
     //System.out.println("File opened successfully");
/* CLOSE FILE */
private void closeFile(File fileName_in) {
if (fileInput != null) {
     try {
          fileInput.close();
     catch (IOException ioException) {
     JOptionPane.showMessageDialog(this,"Error Opening File",
               "Error 4: ",JOptionPane.ERROR_MESSAGE);
System.out.println("File closed");
private void process(File fileName_in) {
//getNumberOfLines();
     //data = new String[numLines][3];
     // Read file
double temp,temp1;
     //readTheFile();
//System.out.println("row:"+row);
//int number=data.length;
//System.out.println(number);
for (int i=0; i<row; i++)
temp=Double.parseDouble(data[i][1]);
sumx+=temp;
temp1=Double.parseDouble(data[i][3]);
sumy+=temp1;
multixy+=(temp*temp1);
square_x_sum+=(temp*temp);
square_y_sum+=(temp1*temp1);
//System.out.println("Sum(x)="+sumx);
double tempup=(row*multixy)-(sumx*sumy);
double tempdown=(row*square_x_sum)-(sumx*sumx);
slope=tempup/tempdown;
double tempbup=sumy-(slope*sumx);
intb=tempbup/row;
double tempside=(row*square_y_sum)-(sumy*sumy);
double cordown=Math.sqrt(tempdown*tempside);
corr=tempup/cordown;
r_sqrt=corr*corr;
     textArea.append("Data for file"+ fileName_in.getName()+" have been processed successfully.");
     textArea.append("\n");
     textArea.append("Please enter output file name including extension.");
System.out.println("number"+row);
System.out.println("slope(m)="+slope);
System.out.println("intecept b="+intb);
System.out.println("correlation="+corr);
System.out.println("correlation="+r_sqrt);
saveFile();
private void saveFile()
textArea.append("SAVE FILE\n---------\n");
if (openFile1())
     try {
          outputToFile();
catch (IOException ioException) {
          JOptionPane.showMessageDialog(this,"Error Writing to File",
               "Error",JOptionPane.ERROR_MESSAGE);
private boolean openFile1 ()
     // search for the file path
StringBuffer stringpath;
title=textfield1.getText().trim();
int temp=fileName_in.getName().length();
int temp_path=fileName_in.getPath().length();
int startd=(temp_path-temp);
stringpath=new StringBuffer(fileName_in.getPath());
stringpath.delete(startd, temp_path+1);
//System.out.println("file-path="+temp_path);
//System.out.println("length-file="+temp);
path=stringpath.toString();
fileName_out = new File(path, title);
//System.out.println(file_out.getName());
if (fileName_out==null || fileName_out.getName().equals(""))
     JOptionPane.showMessageDialog(this,"Invalid File name",
               "Invalid File name",JOptionPane.ERROR_MESSAGE);
     return(false);
     else
try
boolean created = fileName_out.createNewFile();
if(created)
fileOutput = new PrintWriter(new FileWriter(fileName_out));
fileOutput.println("File Name"+"\t"+"Slope(m)"+"\t"+"y-intercept(b)"+"\t"+"Coefficient(r)"+"\t"+"Correlation(R-Squared)");
return(true);
else
fileOutput = new PrintWriter(new FileWriter(fileName_out,true));
return(true);
catch (IOException exc)
JOptionPane.showMessageDialog(this,"Please enter the file name","Error",JOptionPane.ERROR_MESSAGE);
return(false);
private void outputToFile() throws IOException
// Initial output
     textArea.append("File name = " + fileName_out + "\n");
     // Test if data exists
     if (data != null)
     fileOutput.println(fileName_in.getName() +"\t"+ slope+"\t"+intb+"\t"+corr+"\t"+r_sqrt);
textArea.append("File output complete\n\n");
     else
textArea.append("No data\n\n");
     // End by closing file
initialcomp();
     fileOutput.close();
private void initialcomp()
slope=0.0;
intb=0.0;
corr=0.0;
r_sqrt=0.0;
sumx=0.0; sumy=0.0; multixy=0.0; square_x_sum=0.0; square_y_sum=0.0;
for(int i=0;i<data.length;i++)
for(int j=0;j<data[i].length;j++)
data[i][j]=null;
/* MAIN METHOD */
public static void main(String[] args) throws IOException
     // Create instance of class FileChooser
     FileReduction1 newFile = new FileReduction1("File Reduction Program");
     // Make window vissible
     newFile.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     newFile.setSize(500,400);
newFile.setVisible(true);
Sorry about the long lines.
As you can see, all input files saved in array called files, however when OpenFile1() function is called, it take input (fileName_in) as a single file not an array. I'm assuming this causes the exception.
When there's muptiple inputs, program should take each file from getFileName() to outputToFile() sequentially.
Does anybody have an idea to solve this?
Thanks a lot!!

you naming convention is confussing. you should follows Java naming convention..you have a getXXX but decalred the return type as "void"...get usully means to return something...
your code is doing too much..and hard to follows..
1. get the selected files
for each selected file
process the file and return the result
write out the result.
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        try{ in.close(); }
        catch (Exception e){}
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    BufferedReader in = null;
    int lineCount = 0;
    try{
        in = new BufferedReader(new FileReader(file));
        while ((in.readLine() != null)
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        return lineCount;
    finally{ closeResource (in); }
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    BufferedReader in = null;
    StringBuffer result = new StringBuffer();
    try{
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How to read a file and save the contents into array list

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Post code: BA1 74E
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can anyone help me please. thank you in advance.

thank you for your suggestion, but i have already started to code the readCustomer class using the Scanner.
the code i got so far is:
import java.util.Scanner;
import java.io.*;
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*// here is where i am struggling. i don't know how to get the information after the : sign*
}i am currently struggling with the processLine method?
also, i am not sure how to group a set of information and put them into the arraylist.
Any hint, please. Thank you.
Edited by: mujingyue on Feb 26, 2008 12:42 PM

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thanks in advance,
Ratheesh

hi,
y iam putting this double quotes is because i need this fieds as such.thats y.and what u have said is right ..this @id is a keyword by which i want to select records.could u pls help me out in doing this script.i f thsi @id is not to be mentioned in insert then where will i mention about this @id.Because it has to be incremented when its moved to next record.
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"@Id" number;
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a:=a+1;
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commit;
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hdfsgfjsgfjsfg
kshfkwhfl
kshfakh
kahflak
Xunit , YUNIT
1,2
2,3
5,4
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import java.io.*;
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If you are only trying to read in integers i would recommend a different approach. Try using the scanner class. It's new to 1.5 It basically splits up everything in the data source into tokens based on where there is white space. what might interest you is that it has methods to just retrieve primitive types ints, doubles etc.
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Scanner.html
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ECG000 1 171 26112 9:14:56 23/04/2002
ECG000 8 43(0) 8 127 79 -24066 0 AED trace
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I think this is what you're looking for:     private void FileExt() {
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How can I automatically fill and save PDF forms from an iSeries database file withouth viewing PDFs?

We have incoming data that we need to insert into a PDF form then save an individual PDF file for each record from the database table for our Image system. Data is coming from an iSeries file and I can Manually perform all the steps within the process, but this needs to be something that we can run from a scheduled job and should be a totally hands off process. The form is in Adobe Acrobat and I've been trying some of the JavaScript pieces, but can't seem to get everything to run automatically. I'm new to PC programming and can use any suggestions on how to handle this process.

You might want to post this to the Acrobat SDK forum here. For it to work with Acrobat, it cannot be a completely automated process, however, due to licensing (and technical) restrictions. There are a number of third-party APIs that might help. If you post again, include what format the data is in (FDF, XFDF, XML, XDP) and what programming languages you can work in.

In Pages I used to be able to edit a template and "save a version" to update the template. Now i have to rename the template to save the changes. Why is this happening? what happen to "save a version"? its no longer an option under "file".

In Pages, In the past, I was able to edit a template and "save a version" to update the template. Now i have to rename the template to save the changes. Why is this happening? what happen to "save a version"? its no longer an option under "file". And I can no longer open the actual template, when template is clicked, it automaticaly opens an "untitled" version???

In your description you say the first document opens as the Title you gave it.
Templates always open as Untitled so it sounds like you have saved a regular document, perhaps into your templates folder which is possible.
Since you have already worked on it and it has been previously saved, Lion will now Save for you and Save a Version is available
The other document does open as Untitled so sounds like a real template and as Peggy has pointed out will not have either Revert nor Save a Version until you Save it and have changed something in it.
This is a classic example of just how Apple's supposedly "simplification" of the process, is leading to confusion of what has happened. That the conditions and resulting actions from those conditions is so convoluted says it all.
It all reminds me of the Monty Python Life of Brian sketch with the "simplified" John Cleese instructions to the class, as to if you have a brother in an older dorm whether to hang your hat and bag on the hooks provided. The trouble is Apple does not get the joke, that it is transforming itself into a frequently self contradictory bumbling bureacracy. The price of unchallenged self appointed geniushood.
The incoherent half baked stumbling juggernaut has reached new triumphs with its edict on enforced Sandboxing on developers when it is unable to follow even its own instructions.
Peter

I uploaded photos in .jpg format to my iPad, but now all of those photos appear as .ithmb files and cannot be opened, even on the thumbdrive they originated from. How do I get them back to .jpgs?

I uploaded photos in .jpg format to my iPad, but now all of those photos appear as .ithmb files and cannot be opened, even on the thumbdrive they originated from. How do I get them back to .jpgs?

Sorry, should've mentioned some more information. I synced the ipad to the folder of photos. The original photos had file names like "_MG_4865.jpg" and after syncing the folder in Itunes, all files were now found in a folder called "iPod Photo Cache" which was filled with many folders with labels like "F23" etc. (There were ALOT of photos.) In those folders there are several files with names like "T343.ithmb". Not a .jpg to be found and I can't view any of the photos.

How to read a file and save the line number of the last line read?

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