TextIO

public class Greeting {
/* This program asks the user's name and then
greets the user by name. This program depends
on the non-standard class, TextIO.
public static void main(String[] args) {
String usersName; // The user's name, as entered by the user.
String upperCaseName; // The user's name, converted to uppercase letters.
TextIO.put("Please enter your name: ");
usersName = TextIO.getln();
upperCaseName = usersName.toUpperCase();
TextIO.putln("Hello, " + upperCaseName + ", nice to meet you!");
} // end main()
} // end class
I got above program from below given link
http://www.faqs.org/docs/javap/c2/ex-2-3-answer.html
I am unable to compile this program as i am getting the below given error
3 errors found:
File: F:\practicals\oop\ROUGH\Greeting.java [line: 14]
Error: cannot find symbol
symbol : variable TextIO
location: class Greeting
File: F:\practicals\oop\ROUGH\Greeting.java [line: 15]
Error: cannot find symbol
symbol : variable TextIO
location: class Greeting
File: F:\practicals\oop\ROUGH\Greeting.java [line: 19]
Error: cannot find symbol
symbol : variable TextIO
location: class Greeting
i also tried using import statement like java.io.*; and java.util.*; at top
i am using: Dr Java IDE and have installed java 1.5
If anybody helps me it would be great help as i am strucked in begining of the tutorial, as author is using this TextIO class more often in his tutorial
Thanks in advance
Suresh
Call Coordinator
HP India
Bangalore
Edited by: suryafromkoppal on Jul 5, 2008 3:24 PM

suryafromkoppal wrote:
public class Greeting {
/* This program asks the user's name and then
greets the user by name. This program depends
on the non-standard class, TextIO.
*/That comment tells you - just as your compiler is telling you - that compiling your application depends on a class that is not part of the standard java library. You need to make sure that when you are compiling, you are including the location of the TextIO class in your classpath. I'd recommend reading the tutorial (I didn't check out the link), but I'm sure they provide some information on finding the TextIO class so that you can compile the examples.

Similar Messages

Having trouble finding out why i get "cannot find symbol variable textio"

Im trying to write a romanNumeral converter program.
I dont know what else im doing wrong!
Please help me to see and understand what i did wrong!

Please help me to see and understand what i did wrong!You are using something called 'textio'
The compiler doesn't know what that is.
It is telling you exactly that.

Import textio.ConsoleIO

i have been told to write a program using import textio.ConsoleIO but when i try to use it i am told it does not exsist

There is no such package in the default API.
Whoever told you too do such a thing (prof, teacher, book, on line tutorial) should have told you where to get the package.
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I made the download of NetBeans IDE 4.0 and itdoesn't recognise the TextIO.
EX:
int abc = TextIO.getInt();
What do I do ? Is there any other way to input text ?I just took a quick peek at the Javadocs for all the core classes, but TextIO
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Writing data into files using VHDL Textio

Hi
I was trying to write nos. from 1 to 8 into a text file using the below program.
process
type IntegerFileType is file of integer;
file data_out: IntegerFileType ;
variable fstatus: FILE_OPEN_STATUS;
variable coun: natural:= 1;
begin
file_open(fstatus,data_out,"myfile.txt",write_mode);
for i in 1 to 8 loop
write(data_out, coun);
coun := coun + 1;
end loop;
file_close(data_out);
wait; -- an artificial way to stop the process
end process;
But getting the below attached result..
Can you please help me out what could be wrong with the program.
Thanks & regards
Madhur

Do you want the numbers in the file to be human readable ASCII?
Then you'll need to convert your coun to a string.
declare another variable of type line (type access to string).
do a write() to the line, then a writeline() to the file.
natural'image(coun) will convert coun to a string.
Google should help you find example code that will help.

Can I write to a text file on local HDD from forms appl?

Hi All,
We have 8i database being accessed by 6i forms application using web-based arch. Clients are on windowsNT/window2000. Is it possible to dump some data in a text file from forms application (by pressing a button) on local hard disk? User is looking something similar to sqlplus spool in forms 6i. Is this possible? User is specific about file being created in local machine and not on server(utl_file/dbms_pipe). Any ideas?
Thanks.

You can find explanation and a quick start guide on PJCs on the Forms Upgrade Center at:
I think the following code can give you a starting point for a PJC (based on text_item) that will do it.
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To activate this PJC you will use something like SET_CUSTOM_PROPERTY ('text_item1', 1, 'WRITE', :text_item1);
In your form.
import oracle.forms.ui.VTextField;
import java.io.FileOutputStream;
import oracle.forms.properties.ID;
public class textio extends VTextField
public final static ID WRITE = ID.registerProperty("WRITE");
String a = "hello";
public textio()
public boolean setProperty(ID p0, Object p1)
if (p0==WRITE)
try
FileOutputStream fileOut = new FileOutputStream("c:\\temp\\textio.txt");
fileOut.write(p1.toString().getBytes());
fileOut.close();
} catch (Exception ex)
ex.printStackTrace();
}

How to Implement simple Timer in this code

Hi there guys,
This is a small ftp client that i wrote. It has encryption and all bulit into it. I want to initiate the sendfile function every 5 minutes.
The program starts with the displaymenu function wherein a menu with various options is displayed.
How Do i Do that? I went online and tried doing it myself but cud not possibly think of a reason as to why my changes were not working.
Here is the basic code. I earnestly hope that some of you guys out there will help me. This is a very simple problem and sometimes it is the finer point that eludes us. any help will be deeply appreciated
import java.net.*;
import java.io.*;
import java.util.*;
import java.lang.*;
import javax.crypto.*;
import java.util.regex.*;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
class FTPClient
     public static void main(String args[]) throws Exception
          Socket soc=new Socket("127.0.0.1",5217);
          transferfileClient t=new transferfileClient(soc);
          t.displayMenu();
class transferfileClient
     Socket ClientSoc;
     DataInputStream din;
     DataOutputStream dout;
     BufferedReader br;
     transferfileClient(Socket soc)
          try
               ClientSoc=soc;
               din=new DataInputStream(ClientSoc.getInputStream());
               dout=new DataOutputStream(ClientSoc.getOutputStream());
               br=new BufferedReader(new InputStreamReader(System.in));
          catch(Exception ex)
     //encrypto routine starts
class DesEncrypter {
       Cipher ecipher;
        Cipher dcipher;
        // 8-byte Salt
        byte[] salt = {
            (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
            (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
        // Iteration count
        int iterationCount = 19;
        DesEncrypter(String passPhrase) {
            try {
                         // Create the key
                         KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
                         SecretKey key = SecretKeyFactory.getInstance(
                         "PBEWithMD5AndDES").generateSecret(keySpec);
                         ecipher = Cipher.getInstance(key.getAlgorithm());
                         dcipher = Cipher.getInstance(key.getAlgorithm());
                         // Prepare the parameter to the ciphers
                         AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
                         // Create the ciphers
                         ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
                         dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
            } catch (java.security.InvalidAlgorithmParameterException e) {
            } catch (java.security.spec.InvalidKeySpecException e) {
            } catch (javax.crypto.NoSuchPaddingException e) {
            } catch (java.security.NoSuchAlgorithmException e) {
            } catch (java.security.InvalidKeyException e) {
        // Buffer used to transport the bytes from one stream to another
        byte[] buf = new byte[1024];
        public void encrypt(InputStream in, OutputStream out) {
            try {
                // Bytes written to out will be encrypted
                out = new CipherOutputStream(out, ecipher);
                // Read in the cleartext bytes and write to out to encrypt
                int numRead = 0;
                while ((numRead = in.read(buf)) >= 0) {
                    out.write(buf, 0, numRead);
                out.close();
            } catch (java.io.IOException e) {
        public void decrypt(InputStream in, OutputStream out) {
            try {
                // Bytes read from in will be decrypted
                in = new CipherInputStream(in, dcipher);
                // Read in the decrypted bytes and write the cleartext to out
                int numRead = 0;
                while ((numRead = in.read(buf)) >= 0) {
                    out.write(buf, 0, numRead);
                out.close();
            } catch (java.io.IOException e) {
}     //encryptor routine ends
     void SendFile() throws Exception
                         String directoryName; // Directory name entered by the user.
                         File directory;        // File object referring to the directory.
                         String[] files;        // Array of file names in the directory.
                         //TextIO.put("Enter a directory name: ");
                         //directoryName = TextIO.getln().trim();
                         directory = new File ( "E:\\FTP-encrypted\\FTPClient" ) ;
                    if (directory.isDirectory() == false) {
                    if (directory.exists() == false)
                    System.out.println("There is no such directory!");
                    else
                    System.out.println("That file is not a directory.");
            else {
                files = directory.list();
                System.out.println("Files in directory \"" + directory + "\":");
                for (int i = 0; i < files.length; i++)
                         String patternStr = "xml";
                         Pattern pattern = Pattern.compile(patternStr);
                         Matcher matcher = pattern.matcher(files);
                         boolean matchFound = matcher.find();
                                   if (matchFound) {
                                   dout.writeUTF("SEND");
                                   System.out.println(" " + files[i]);
                                   String filename;
                                   filename=files[i];
                                   File f=new File(filename);
                                   dout.writeUTF(filename);
          String msgFromServer=din.readUTF();
          if(msgFromServer.compareTo("File Already Exists")==0)
               String Option;
               System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
               Option=br.readLine();
               if(Option=="Y")
                    dout.writeUTF("Y");
               else
                    dout.writeUTF("N");
                    return;
          System.out.println("Sending File ...");
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               System.out.println("Secret key generated ...");
               // Create encrypter/decrypter class
               DesEncrypter encrypter = new DesEncrypter("My Pass Phrase!");
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               encrypter.encrypt(fino,
               new FileOutputStream("ciphertext.txt"));
               System.out.println("generated ...");
               fino.close();
               FileInputStream fin=new FileInputStream("ciphertext.txt");
          int ch;
          do
               ch=fin.read();
               dout.writeUTF(String.valueOf(ch));
          while(ch!=-1);
          fin.close();
          boolean success = (new File("ciphertext.txt")).delete();
               if (success) {
                              System.out.println("temp file deleted .../n/n");
          for (int j = 0; j < 999999999; j++){}
}//pattermatch loop ends here
else
                         { System.out.println("   " + "Not an XML file-------->" +files[i]); }
          }// for loop ends here for files in directory
               }//else loop ends for directory files listing
     System.out.println(din.readUTF());
     }//sendfile ends here
     void ReceiveFile() throws Exception
          String fileName;
          System.out.print("Enter File Name :");
          fileName=br.readLine();
          dout.writeUTF(fileName);
          String msgFromServer=din.readUTF();
          if(msgFromServer.compareTo("File Not Found")==0)
               System.out.println("File not found on Server ...");
               return;
          else if(msgFromServer.compareTo("READY")==0)
               System.out.println("Receiving File ...");
               File f=new File(fileName);
               if(f.exists())
                    String Option;
                    System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
                    Option=br.readLine();
                    if(Option=="N")
                         dout.flush();
                         return;
               FileOutputStream fout=new FileOutputStream(f);
               int ch;
               String temp;
               do
                    temp=din.readUTF();
                    ch=Integer.parseInt(temp);
                    if(ch!=-1)
                         fout.write(ch);
               }while(ch!=-1);
               fout.close();
               System.out.println(din.readUTF());
     public void displayMenu() throws Exception
          while(true)
               System.out.println("[ MENU ]");
               System.out.println("1. Send File");
               System.out.println("2. Receive File");
               System.out.println("3. Exit");
               System.out.print("\nEnter Choice :");
               int choice;
               choice=Integer.parseInt(br.readLine());
               if(choice==1)
                    SendFile();
               else if(choice==2)
                    dout.writeUTF("GET");
                    ReceiveFile();
               else
                    dout.writeUTF("DISCONNECT");
                    System.exit(1);

here is a simple demo of a Timer usage.
public class Scheduler{
    private Timer timer = null;
    private FTPClient client = null;
    public static void main(String args[]){
        new Scheduler(5000);
    public Scheduler(int seconds) {
        client = new FTPClient();
        timer = new Timer();
        timer.schedule(new fileTransferTask(), seconds*1000);
        timer.scheduleAtFixedRate(new FileTransferTask(client), seconds, seconds);
public class FileTransferTask extends TimerTask{
    private FTPClient client = null;
    public FileTransferTask(FTPClient client){
        this.client = client;
    public void run(){
        client.sendFile();
public class FTPClient{
    public void sendFile(){
         // code to send the file by FTP
}the timer will will schedule the "task": scheduleAtFixRate( TimerTask, long delay, long interval)
It basically spawn a thread (this thread is the class that you
implements TimerTask..which in this example is the FileTransferTask)
The thread will then sleep until the time specified and once it wake..it
will execute the code in the the run() method. This is why you want to
pass a reference of any class that this TimerTask will use (that's why
we pass the FTPClient reference..so we can invoke the object's
sendFile method).

Opening an *.txt file in oracle forms 4.5

I am facing this problem I want to call an text file from a certain location and display the same when an user hits a particular button which has to be done in Oracle Forms 4.5.
Could u pls help me

If you want to display the *.txt file use ole object to do that and if you want to read the data from the text file and display in the text field then use textio package.
Hope this helps you.
Regards
Gaurav

Help (Timed program)

I�ve done this game, that if the user takes more than 30 sec. to answer, the program, when the user answer, tells that the time has been more that 30 sec. so the answer is not valid;
I would like that the program, during the time the user is answering, displays the time passing and when it reaches 30 sec. it stops and says to the user that the time has passed, and that there is no more time, so the correct answer would be (for example) **-;
Does someone knows how to do this?
Thank�s for all your posts!
import java.io.*;
public class J24{
    public static void main(String[] args){
        String[] game, result;
        game=new String[3176];
        result=new String[3176];
        TextReader readfile;
        String name="JOGO24.txt";
        try{
            readfile = new TextReader(new FileReader(name));
        catch (TextReader.Error e) {
            System.out.println("\n\n\nAN ERROR OCURRED DURING READING FILE!");
            return;
        catch (FileNotFoundException e) {
            return;
        char c1, c2, c3, c4;
        int count;
        count=0;
        try{
            while(readfile.eof()==false){
                c1=readfile.getChar();
                c2=readfile.getChar();
                c3=readfile.getChar();
                c4=readfile.getChar();
                String str = new StringBuffer().append(c1).append(c2).append(c3).append(c4).toString();
                game[count]=str;
                c1=readfile.getChar();
                c2=readfile.getChar();
                c3=readfile.getChar();
                String str2= new StringBuffer().append(c1).append(c2).append(c3).toString();
                result[count]=str2;
                count++;
        finally{
            readfile.close();
        int ran=0;
        String Res;
        ran=(int)(Math.random()*3176)+1;
        boolean rpt=false;
        while (rpt==false){
            System.out.println("\n\nI ll give you 4 numbers and you have to find 4 operations to give 24. Ex.:");
            System.out.println("8802");
            System.out.println("8+8+0*2=24; You enter: ++*");
            System.out.println("\n---YOU HAVE 30 SECONDS!!!---");
            System.out.println("\nOk?");
            rpt=TextIO.getBoolean();
        ran=(int) (Math.random()*3176)+1;
        System.out.println("\n\n");
        System.out.println("Number to be 24: "+game[ran]);//ran
        long startTime = System.currentTimeMillis();
        Res=TextIO.getWord();
        long endTime= System.currentTimeMillis();
        if(endTime-startTime>30000){
            System.out.println("");
            System.out.println("Your Passed 30 Seconds!!!");
            if(Res==result[ran]){//ran
                System.out.println("But, in any case it is correct");
            }else{
                System.out.println("And the correct answer would be "+ result[ran]);
            System.exit(0);
        if(Res==result[ran]){//ran
            System.out.println("Correct!");
        }else{
            System.out.println("Correct answer would be "+ result[ran]);
}

Hi,
Which hardware are you using??
Nevertheless, you will find an example VI with examples shipped with labVIEW called "temperature system demo.vi" a simulated temperature measurement program.
replace the temp simulation with hardware thermocouple acquisition VI's
That VI it might suit your purpose
find attached that VI
Any doubts, do get back
regards
Dev
Message Edited by devchander on 03-08-2006 10:48 PM
Attachments:
Temperature System Demo.llb ‏188 KB

Can't compile - URGENT

hi. hope someone can help. this is important, it's for my coursework at uni.
I have downloaded the new java 1.4.1_01 and installed. i set the paths in my IDE to it, everything great, but if I compile, it says:
"Registry key 'Software\JavaSoft\Java Runtime Environment\CurrentVersion'
has value '1.4', but '1.3' is required.
Error: could not find java.dll
Error: could not find Java 2 Runtime Environment."
How do I fix it?????
Before, all was fine with JDK 1.3.1 but then problems happened, tried re-installing, no luck so I moved to the new version, this is what is happening.
PLEASE this is urgent, can someone help?
thanks

a right...someone from my uni must have the same problem.
any way, problem sorted, I re-installed the JDK and SDK and it's working now.
but how can I import the .java files I need for my course?
I have this code:
import textio.ConsoleIO;
import Date;
import Calander;
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but it produces an error:
C:\coursework2\mainapplication.java:16: '.' expected
import Date;
^
C:\coursework2\mainapplication.java:17: '.' expected
import Calander;
^
C:\coursework2\Date.java:15: package Calander does not exist
import Calander.java;
^
3 errors
Process completed.
what should I do?
I tried deleting the .java; but that didn't help at all.
any help, is appreciated

Webutil and SQLLDR

It used to be on the client server when we run a batch file with sqlldr from a form, a cmd window would open and we can actually see a count of the records, and if we want we could make it that the user would have to click a button to close the cmd window and return to the form.
Now with the web version and webutil, I was able to make the batch file work and the data is loaded into a table, however, when the cmd window opens, it stays blank and you cannot see what is happening.
Is there a way to get the same performance as the client server version?
Thanks
George

Hi,
You can read the output/log file using textio (implemented through webutil)
and give a message to the end user.
Alternatively use the webutil host to open a command window and pass batch file which will do the sql ldr ....
Rajesh Alex

Can someone test a prog for me, and help reading from an exty file

Okay, I have a program to calculate the Pearson product-moment correlation coefficient ( http://en.wikipedia.org/wiki/Pearson_correlation_coefficient ) from an external file that I've just written for an assignment on Monday.
I can't actually run it because I can't find a machine with Java on that works, though I can compile it. Why is a long story, but University Admin are going to feel my wrath.
I would like two things.
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14.234 54.4534
376.56 432.2332
23432. 23234.23
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The file follows:
// Import packages
     import java.io.*; // Import all the Java input/output packages
     import java.util.StringTokenizer; // Import a utility package
class Pearsontwo
public static void main (String[] args)
     /* Define variables.
          (double any number with decimal point.
          ints take integer value) */
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                    sumxx, sumyy,          // sum of x squared and y squared
                    sumxy;                    // sum of products of x and y
          int n;                              // n is number of lines
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     //     (Enhancement: use user input. This requires the use of System.in which is a bit complicated.
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          //fileName = TextIO.getInt();
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BufferedReader br;     // Will be used to read the file
String line;          // Will be used to hold a line read from the file
StringTokenizer st; // Will be used to break a line into separate words
          String firstWord, secondWord;     // File will be read as string type
double firstNumber, secondNumber;     // that need to be converted into numbers.
try // if an error occurs, go to the "catch" block below
// Create a buffered file reader for the file
     br = new BufferedReader (new FileReader(fileName));
// Continue to read lines whilst there is one or more left to read
                    while (br.ready())
                    {   line= br.readLine();               // Read one line of the file
                         st = new StringTokenizer(line);     // Prepare to split the line into "words"
                         // Get the first two words (invalid --> error --> catch)
                              firstWord = st.nextToken();
                              secondWord = st.nextToken();
                         // Turn words into numbers (invalid --> error --> catch)
                              firstNumber = Double.parseDouble(firstWord);
                              secondNumber = Double.parseDouble(secondWord);
                         // Add the numbers to the previously stored numbers
                              sumx = sumx + firstNumber;
                              sumy = sumy + secondNumber;
                              sumxx = sumxx + (firstNumber * firstNumber);
                              sumyy = sumyy + (secondNumber * secondNumber);
                              n = n++; add one to the value of n.
// Close the file
br.close();
// Handle any error in opening the file
               catch (Exception e)
               {   System.err.println("File input error.\nPlease amend the file " + fileName);
          //     Calcuate r in stages, variance and covariance first.
               double variancex = (sumx2 - (sumx * sumx / n)) / (n - 1);     // calculates the variance of x ...
               double variancey = (sumx2 - (sumx * sumx / n)) / (n - 1);     // ... and y
               double covariance = (sumx * sumy - sumx * sumy / n ) / (n - 1);     // and the covariance of x and y
               double r = covariance / Math.sqrt(variancex * variancey);     // and the Pearson r value
               // Printout
               System.out.print("The Pearson product-moment correlation for these data is:" );
               System.out.println ( r );
               // Also print to file ?
Cheers,
Duncan.
(Note: this is my own work by Duncan Harris at Cariff University, so I'm not plaigerising anyone other than myself if I post it here and it subsequently gets found by one of the course organisers who have given permission for this sort of thing anyway!)

"I can't actually run it because I can't find a machine with Java on that works, though I can compile it. Why is a long story, but University Admin are going to feel my wrath."
I'm sure they're worried.
I don't understand this. You can compile, but not run? This makes no sense at all.
Why can't you simply download the JDK from Sun and install it on a machine? You could both compile and run then.
You don't need a pop-up dialog box to get an input file name from a user. The command prompt is quite sufficient.

Reading from text file gives IndexOutOfBoundsException error

Dear All
I really need your help in doing my assignment as soon as possible
I am reading from a text file the following data
4231781,Ali,AlAli
4321790,Adnan,AlAli
using two classes first one is
public class Student
private String studFName;
private String studLName;
private String studID;
private double assignment1;
private double assignment2;
private double final_exam;
private double total;
public String getstudfName() {
return studFName;
public void setstudfName(String studFName) {
this.studFName = studFName;
public String getstudlName() {
return studLName;
public void setstudlName(String studLName) {
this.studLName = studLName;
public String getstudid() {
return studID;
public void setStudID(String studID){
this.studID = studID;
public double getAssignment1() {
return assignment1;
public void setAssignment1(double Assignment1) {
this.assignment1 = assignment1;
public double getAssignment2() {
return assignment1;
public void setAssignment2(double Assignment2) {
this.assignment2 = assignment2;
public double getFinal_exam() {
return final_exam;
public void setFinal_exam(double final_exam) {
this.final_exam = final_exam;
public double getTotal() {
return total;
public void setTotal(double total) {
this.total = total;
Student[] students = new Student[30];
the second is manager one which is:
import java.io.*;
import java.io.IOException;
import java.util.Arrays;
import java.util.ArrayList;
public class manager {
public static Student[] students = new Student[30];
public static void main(String args[]) {
// We want to let the user specify which file we should open
// on the command-line. E.g., 'java TextIO TextIO.java'.
if(args.length != 1) {
System.err.println("usage: java manager (file_name)");
System.exit(1);
// We're going to read lines from 'input', which will be attached
// to a text-file opened for reading.
BufferedReader input = null;
try {
FileReader file = new FileReader(args[0]); // Open the file.
input = new BufferedReader(file); // Tie 'input' to this file.
catch(FileNotFoundException x) { // The file may not exist.
System.err.println("File not found: " + args[0]);
System.exit(2);
// Now we read the file, line by line, echoing each line to
// the terminal.
try {
String line;
// Student[] students = new Student[30];
while( (line = input.readLine()) != null ) {
// System.out.println(line);
int m = line.indexOf(",");
int j = line.lastIndexOf(",");
String sID = line.substring(0,m);
String sfn = line.substring(m+1,j) ;
String sln = line.substring(j+1);
int n = 0;
students[n] = new Student();
students[n].setStudID(sID);
students[n].setstudfName(sfn);
students[n].setstudlName(sln);
students[n].setAssignment1(0.0);
students[n].setAssignment2(0.0);
students[n].setFinal_exam(0.0);
students[n].setTotal(0.0);
++n;
catch(IOException x) {
x.printStackTrace();
// Arrays.sort(Student.students);
int length = args.length;
System.out.println();
// System.out.println("Sorted by stuID");
for (int i=0; i<length; i++) {
System.out.print("Student ID "+students.getstudid() + "|||");
System.out.print("Student Fname "+students[i].getstudfName() + "|||");
System.out.print("Student name "+students[i].getstudlName());
when I comile progrma it doesn't give any error but when I run it gives me the following exception:
java.lang.String.substring. IndexOutOfBoundsException string index out of range : -1
as can be seen from the manager class I form the read line from readline method as follows:
int m = line.indexOf(",");
int j = line.lastIndexOf(",");
String sID = line.substring(0,m);
String sfn = line.substring(m+1,j) ;
String sln = line.substring(j+1);
Therefore, student ID should be read from the beggining tel the character before the comma (,) then from the character after first comma tel that before second comma will be firstname, finally the rest after second comma will be last name.
I want my program to read all lines in the text file and put them in order as above forming the array like database record and print them all.
Could you please Help me in this matter friends as soon as possible.
Regards,
Java_Hobby

please, format you code first (select your java code and hit the code button), then post all the error log message.

Java Interface as problems

Hi this code for java i am having major problems. I am a newbie to java so please be kind and hope in the feature i can master java and then help to each others. I will include the show GUI class later.
My main problem is how to assign events to the button so that it preforms a calculation.
Second what should make my GUI run properly and what actions do i need to take.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ConvertValues extends JPanel {
public class ConvertValues {
     JFrame window;
     JComboBox inputcombo,outputcombo;
     JRadioButton Length,Mass,Volume,Temperature;
     JButton = new JButton("Convert");
     JTextField outputtext, inputtext;
     public ConvertValues(){
          window = new JFrame("Imperial to Metric Converter");
          window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          window.setSize(600,600);
          window.setVisible(true);
          addRadioButtons();
          addComboBox();
          public void addPanel(){
          Public JPanel getPanel();
          JPanel wrapper = new JPanel();
          wrapper.setLayout(new BorderLayout());
          wrapper.setBorder(BorderFactory.createEmptyBorder(13,13,13,13));
          JPanel centre = new JPanel ();
          centre.setLayout(new GridLayout(2,2));
          public void addRadiobButton(){
          JRadioButton RadioButton = new JRadioButton();
          JPanel rbut = new JPanel();
          rbut1.setLayout(new GridLayout(4,4));
          JPanel panel1 = new JPanel();
          JLabel metric = new JLabel (" Length Metric Values")
          panel1.add(metric);
          rbut1.add (panel1);
          JPanel panel2 = new JPanel();
          JTextField text1 = new JTextField (13);
          panel2.add(text1);
          rbut1.add(panel2);
          JPanel panel3 = new JPanel();
          JLabel imperial = new JLabel ("Length Imperial Values")
          panel3.add(Imperial);
          rbut1.add (panel3);
          JPanel panel4 = new JPanel();
          JTextField text2 = new JTextField (13);
          panel4.add(text2);
          rbut1.add(panel4);
          JPanel rbut2 = new JPanel();
          rbut2.setLayout(new GridLayout (4,4));
          JPanel panel5 = new JPanel ();
          JLabel metric2 = new JLabel ("Liquid Metric Values");
          panel5.add(metric2)
          rbut2.add(panel5);
          JPanel panel6 = new JPanel ();
          JTextField text3 = new JTextField (13);
          panel6.add(text3);
          rbut2.add(panel6);
          JPanel panel7 = new JPanel ();
          JLabel imperial2 = new JLabel ("Liquid Imperial Values");
          panel5.add(imperial2)
          rbut2.add(pane7);
          JPanel panel8 = new JPanel ();
          JTextField text4 = new JTextField (13);
          panel8.add(text4);
          rbut2.add(panel8);
          JPanel rbut3 = new JPanel();
          rbut3.setLayout(new GridLayout (4,4));
          JPanel panel9 = new JPanel ();
          JLabel metric3 = new JLabel (" Mass Metric Values");
          panel9.add(metric3)
          rbut3.add(panel9);
          JPanel panel10 = new JPanel ();
          JTextField text5 = new JTextField (13);
          panel10.add(text5);
          rbut3.add(panel10);
          JPanel panel11 = new JPanel ();
          JLabel imperial3 = new JLabel ("Mass Imperial Values");
          panel11.add(imperial3)
          rbut3.add(pane11);
          JPanel panel12 = new JPanel ();
          JTextField text6 = new JTextField (13);
          panel12.add(text6);
          rbut3.add(panel12);
          JPanel rbut4 = new JPanel();
          rbut4.setLayout(new GridLayout (4,4));
          JPanel panel13 = new JPanel ();
          JLabel metric4 = new JLabel (" Temperature Metric Values");
          panel13.add(metric4)
          rbut4.add(panel13);
          JPanel panel14 = new JPanel ();
          JTextField text6 = new JTextField (13);
          panel14.add(text6);
          rbut4.add(panel14);
          JPanel panel15 = new JPanel ();
          JLabel imperial4 = new JLabel ("Temperature Imperial Values");
          panel15.add(imperial4)
          rbut4.add(pane15);
          JPanel panel16 = new JPanel ();
          JTextField text7 = new JTextField (13);
          panel16.add(text7);
          rbut4.add(panel16);
          radiopanel.add("Length","rbut1")
          radiopanel.add("Liquid Mass","rbut2")
          radiopanel.add("Mass","rbut3")
          radiopanel.add("Temperature","rbut4")
          public void addComboBox(){
          JPanel panel17 = new JPanel();
          String[] str = {"Milliimeters", "Centimeters", "Meters", "Kilometers"};
          JComboBox metricvalues = newJComboBox(str);
          panel17.add(metricvalues);
          rbut1.add(panel17);
          JPanel panel18 = new JPanel();
          String[] str2 = {"Inch", "Foot", "Yard", "Mile"};
          JComboBox imperialvalues = newJComboBox(str2);
          panel18.add(imperialvalues);
          rbut1.add(panel18);
          JPanel panel19 = new JPanel();
          String[] str3 = {"Litres", "Millilitres", "Litres"};
          JComboBox metricvalues = newJComboBox(str3);
          panel19.add(metricvalues);
          rbut2.add(panel19);
          JPanel panel20 = new JPanel();
          String[] str4 = {"Fluid", "Ounce", "Pint", "Quart", "Gallon"};
          JComboBox imperialvalues = newJComboBox(str4);
          panel20.add(imperialvalues);
          rbut2.add(panel20);
          JPanel panel21 = new JPanel();
          String[] str5 = {"Grammes", "Kilogrammes", "Metric Tonne"};
          JComboBox metricvalues = newJComboBox(str5);
          panel21.add(metricvalues);
          rbut3.add(panel21);
          JPanel panel22 = new JPanel();
          String[] str6 = {"Ounce", "Pound", "Stone", "Long Ton"};
          JComboBox imperialvalues = newJComboBox(str6);
          panel22.add(imperialvalues);
          rbut3.add(panel22);
          JPanel panel23 = new JPanel();
          String[] str6 = {"Grammes", "Kilogrammes", "Metric Tonne"};
          JComboBox metricvalues = newJComboBox(str6);
          panel23.add(metricvalues);
          rbut4.add(panel23);
          JPanel panel24 = new JPanel();
          String[] str7 = {"Ounce", "Pound", "Stone", "Long Ton"};
          JComboBox imperialvalues = newJComboBox(str7);
          panel24.add(imperialvalues);
          rbut4.add(panel24);
          frame.getContentPane().add(center, BorderLayout.CENTER);
          public void addLabelandtext();{
          inputlabel = new JLabel("Enter Value");
          valuelabel = new JLabel("0");
          metricLabel = new JLabel ("Metric Value");
          imperial value = new JLabel("Imperial Value");
          outputtext = new JTextField(8);
          inputtext = new JTextField (8);
          JPanel labelpanel = new JPanel();
          labelpanel.add(inputlabel);
          labelpanel.add(mJPanel panel25 = new JPanel();
          labelpanel.add(imperiallabel);
          labelpanel.add(valuelabel);
          labelpanel.add(outputtext);
          labelpanel.add(inputtext);
          JPanel top = new JPanel(new GridLayout(5,3));
          middle.add(labelpanel);
          frame.getContentPane().add(middle,BorderLayout.SOUTH);
          public void ConvertButton();{
               JPanel panel25 = new JPanel();
               JButton convert = new JButton ("CONVERT");
               Convert.addActionListener(this);
               panel25.add(convert);
               rbut1.add(panel 25));
               JPanel panel26 = new JPanel();
               JButton convert = new JButton ("CONVERT");
               Convert.addActionListener(this);
               panel26.add(convert);
               rbut2.add(panel 26));
               JPanel panel27 = new JPanel();
               JButton convert = new JButton ("CONVERT");
               Convert.addActionListener(this);
               panel27.add(convert);
               rbut3.add(panel 27));
               JPanel panel28 = new JPanel();
               JButton convert = new JButton ("CONVERT");
               Convert.addActionListener(this);
               panel28.add(convert);
               rbut4.add(panel 28));
          public void LengthConverter();{
          Let measurement = TextIO.getDouble()
          Let units = TextIO.getlnword();
          if the units are inches
               Let inches = measurement
          else if the units are milimeters
               Let inches = measurement*25.4
          else if the units are Foot
               Let centirmeter = measurement*30.48
          else if the units are Yard
               Let meter = measurement*0.9144
          else if the units are mile
               let kilometers = measurement*1.609
          else if the unit are meters
               let centimeters = measurement*100
          else
               The units are wrong!
               Print an error message and stop processing
          let milimeter = inches/25.4
          let foot = centimeters/30.48
          let Yard = meter/0.9144
          let mile = kilometers/1.609
          let meter = centimeter/100
          dispay the results
          public void VolumeConverter();{
               Let measurement = TextIO.getDouble()
          Let units = TextIO.getlnword();
          if the units are Fluid Ounce
               Let Fluid Ounce = measurement
          else if the units are mililitres
               Let Fluid Ounce = measurement*28.41
          else if the units are Pint
               Let Litres = measurement*0.568
          else if the units are Quart
               Let Litres = measurement*1.14
          else if the units are Gallon
               let litres = measurement*4.54
          else if the unit are litres
               let centilitres = measurement*100
          else
               The units are wrong!
               Print an error message and stop processing
          let mililitres = Fluid Ounce/28.4
          let Pint = Litres/0.568
          let Quart = Litre/1.14
          let Gallon = Litres/4.54
          let litre = centilitre/100
          dispay the results
          public void WeightConverter();{
               Let measurement = TextIO.getDouble()
          Let units = TextIO.getlnword();
          if the units are Ounce
               Let Ounce = measurement
          else if the units are Grammes
               Let Ounce = measurement*28.35
          else if the units are Pound
               Let kilograms = measurement*0.4536
          else if the units are Stone
               Let Kilogrammes = measurement*6.3503
          else if the units are Longton
               let metric tonne = measurement*1.016
          else if the unit are Gramme
               let Killogram = measurement*100
          else
               The units are wrong!
               Print an error message and stop processing
          let Gramme = Ounce/28.35
          let Pound = Kilogram/0.4536
          let Stone = Killogrammes/6.3503
          let Longton = metrictonne/1.016
          let Gramme = Kilogram/100
          dispay the results
          private static void createAndShowGUI();{
               ConvertValues newScreen = new ConvertValues();
     }

My main problem is how to assign events to the button so that it preforms a calculation. [url http://java.sun.com/docs/books/tutorial/uiswing/components/button.html]How to Use Buttons
Also, use the "Code Formatting Tags" when posting code so it retains its original formatting and is readable.

Can't get dupe checking working

I'm currently making an inventory management system in java for college. The user enters a two letter combination (specified in a 2d array, the other side holds the full name for display purposes later). Now I also need to check whether or not the item number has already been entered. This is where I have a problem, it compiles fine but it just doesn't work at all. Here is the item number function, I know its something really small that I'm not seeing. Thanks for any help.
     public static void setItemNo()
          int index = 0;
          String item;
          error = true;
          do
               //get item number
               System.out.print("\n\t\tEnter an item number: ");
               item = TextIO.getlnString();
               item = item.toUpperCase();
               //checking for duplicate entries
               for (int dupeCheck = 0; dupeCheck == publicItemNumber.length; dupeCheck++)
                    if (item == publicItemNumber[dupeCheck])
                         System.out.print("\n\t\titem already entered");
                         dispmenu();
               //item length not equal to 5
               if (item.length() != 5)
                    //item length must be five, it isn't
                    System.out.print("\n\t\tPlease enter a vailid item number\n");
                    error = true;
               //passed error check, item number is 5 chars!
               else
                    error = false;
          }while(error == true);
          //now we check if the first two chars are actually letters
          found = false;
          String firstTwoCharacters = item.substring(0,2);
          while ((found == false) && (index < depts.length))
               if (depts[index][0].equals(firstTwoCharacters))
                    found = true;
                    publicItemNumber[counter] = item;
                    return;
               else if ((found == false) && (index < depts.length))
                    found = false;
                    index = index + 1;
          if (found == false)
               System.out.print("\n\t\tPlease enter a valid number!\n\n");
               return;
     }

In this line:
if (item == publicItemNumber[dupeCheck])Use ".equals" to compare the values. They are Strings. You do it correctly in the 'while' loop near the bottom.

TextIO

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