Reading one line from a text file into an array

i want to read one line from a text file into an array, and then the next line into a different array. both arays are type string...i have this:
public static void readAndProcessData(FileInputStream stream){
     InputStreamReader iStrReader = new InputStreamReader (stream);
     BufferedReader reader = new BufferedReader (iStrReader);
     String line = "";          
     try{
     int i = 0;
          while (line != null){                 
               names[i] = reader.readLine();
               score[i] = reader.readLine();
               line = reader.readLine();
               i++;                
          }catch (IOException e){
          System.out.println("Error in file access");
this section calls it:
try{                         
     FileInputStream stream = new FileInputStream("ISU.txt");
          HighScore.readAndProcessData(stream);
          stream.close();
          names = HighScore.getNames();
          scores = HighScore.getScores();
     }catch(IOException e){
          System.out.println("Error in accessing file." + e.toString());
it gives me an array index out of bounds error

oh wait I see it when I looked at the original quote.
They array you made called names or the other one is prob too small for the amount of names that you have in the file. Hence as I increases it eventually goes out of bounds of the array so you should probably resize the array if that happens.

Similar Messages

  • How to read some lines from a text file using java.

    hi,
    i m new to java and i want to read some lines from a text file based on some string occurrence in the file. This file to be read in steps.
    we only want to read the file upto the first Occurrence of "TEXT" string.
    How to do it ,,,
    Kinldy give the code
    Regards,
    Sagar
    this is the text file
    dfgjdjj
    sfjhjkd
    ghjkdg
    hjkdgh TEXT
    ikeyt
    ujt
    jk
    tyk TEXT
    rukl
    r

    Hendawy wrote:
    Since the word "TEXT" is formed of 4 letters, you would read the text file 4 bytes by four bytes. Wrong on two counts. First, the file may not be encoded 1 byte per character. It could be utf-16 in which case it would be two byte per character. Second, even if it were 1 byte per character, the string "Text" may not start on a 4 byte boundary.
    Consider a FileInputStream object "fis" that points to your text file. use fis.read(byte[] array, int offset, int len) to read every four bytes. Convert the "TEXT" String into a byte array "TEXT".getBytes(), and yous the Arrays class to compare the equality of the read bytes with your "TEXT".getBytes()Wrong since it relies on my second point and will fail when fis.read(byte[] array, int offset, int len) does not read 4 bytes (as is no guaranteed to). Check the Javadoc. Also, the file may not be encoded with the default character encoding.
    The problem is easily solved by reading a line at a time using a BufferedReader wrapping an InputStreamReader wrapping a FileInputStream and specifying the correct character encoding.
    Edited by: sabre150 on Apr 29, 2009 2:13 PM

  • How to read every line from a text file???

    How can i read every line from my text file ("eka.txt")
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    import java.util.*;
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    Try this code, Hope it servers your purpose.
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    import java.util.*;
    class Testi {
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              BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
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              FileReader fis =new FileReader(inputFile);
              BufferedReader bis = new BufferedReader(fis);
              String test=bis.readLine();
              while(test != null) {
                   StringTokenizer st = new StringTokenizer(test," ");
                   while(st.hasMoreTokens())
                        System.out.println(st.nextToken());
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    That is not my problem . i already read it char by char.. i am getting complete line..But this process is taking to much time..So thats why i directly wanna read complete line or word to save time..

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    Krt_malta wrote:
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  • How to read some records from a text file into java(not all records)

    hello,
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    this snipet reads a text file line by line from line 1 to 3
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  • Having trouble reading specific lines from a text file and displaying them in a listbox

    I am trying to read specific lines from all of the text files in a folder that are reports. When I run the application I get the information from the first text file and then it returns this error: "A first chance exception of type 'System.ArgumentOutOfRangeException'
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    Sorry I'm just beginning coding and I'm still a noob. Any help is appreciated. Thank you!

    Ok, so if I'm following this correctly you should be able to just loop through all of the files in that folder whose file name matches the pattern and then read the first 22 lines, recording only the first and the last.
    Exactly how you store the animal data probably depends on how you are going to display it and what else you are going to do with it.  Is there anything other than name and cage number that should be associated with each animal?
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    Public Property Name As String
    Public Property Cage As String
    Public Overrides Function ToString() As String
    Return String.Format("{0} - {1}", Name, Cage)
    End Function
    End Class
    With that you can use a routine like the following to loop through all of the files and read each one:
    Dim animals As New List(Of Animal)
    Dim folderPath As String = "E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\"
    For Each filePath As String In System.IO.Directory.GetFiles(folderPath, "Report Q?.txt")
    Using reader As New System.IO.StreamReader(filePath)
    Dim lineIndex As Integer = 0
    Dim currentAnimal As New Animal
    While Not reader.EndOfStream
    Dim line As String = reader.ReadLine
    If lineIndex = 0 Then
    currentAnimal.Name = line
    ElseIf lineIndex = 22 Then
    currentAnimal.Cage = line
    Exit While
    End If
    lineIndex += 1
    End While
    animals.Add(currentAnimal)
    End Using
    Next
    'do something to display the animals list
    Then you might bind the animals list to a ListBox, or loop through the list and populate a ListView.  If you decided to fill a datatable instead of making Animal instances, then you might bind the resulting table to a DataGridView.
    There are lots of options depending on what you want and what all you need to do.
    Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

  • How to read specific lines from a text file using external table or any other method?

    Hi,
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    row2:   8,9,878,78,657,575,7,5,,,7,7
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    There are various ways to do this.  I would be inclined to use SQL*Loader.  That way you can load it from the client or the server and you can use a SQL*Loader sequence to preserve the row order in the text file.  I would load the whole row as a varray into a staging table, then use the TABLE and MOD functions to load the individual numbers from only the odd rows.  Please see the demonstration below.
    SCOTT@orcl12c> HOST TYPE text_file.csv
    1,2,2,3,3,34,4,4,4,5,5,5,,,5
    8,9,878,78,657,575,7,5,,,7,7
    101,201
    102,202
    SCOTT@orcl12c> HOST TYPE test.ctl
    LOAD DATA
    INFILE text_file.csv
    INTO TABLE staging
    FIELDS TERMINATED BY ','
    TRAILING NULLCOLS
    (whole_row VARRAY TERMINATED BY '/n' (x INTEGER EXTERNAL),
    rn SEQUENCE)
    SCOTT@orcl12c> CREATE TABLE staging
      2    (rn         NUMBER,
      3     whole_row  SYS.OdciNumberList)
      4  /
    Table created.
    SCOTT@orcl12c> HOST SQLLDR scott/tiger CONTROL=test.ctl LOG=test.log
    SQL*Loader: Release 12.1.0.1.0 - Production on Tue Aug 27 13:48:37 2013
    Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.
    Path used:      Conventional
    Commit point reached - logical record count 4
    Table STAGING:
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    Check the log file:
      test.log
    for more information about the load.
    SCOTT@orcl12c> CREATE TABLE a_table
      2    (rn       NUMBER,
      3     data  NUMBER)
      4  /
    Table created.
    SCOTT@orcl12c> INSERT INTO a_table (rn, data)
      2  SELECT s.rn,
      3         t.COLUMN_VALUE data
      4  FROM   staging s,
      5         TABLE (s.whole_row) t
      6  WHERE  MOD (rn, 2) != 0
      7  /
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      2  /
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             1          1
             1          2
             1          2
             1          3
             1          3
             1         34
             1          4
             1          4
             1          4
             1          5
             1          5
             1          5
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             3        201
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  • Reading a Random Line from a Text File

    Hello,
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    import java.awt.*;
    import java.awt.geom.*;
    import javax.swing.*;
    import java.awt.event.*;
    import java.io.*;
    import java.util.*;
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         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,
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         public static String[] words;
         public static int descent;
         public static int YAXIS = 75;
         public static int SIZE = 72;
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              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);
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                   public void actionPerformed(ActionEvent evt){
                        YAXIS += 1;
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                   img = createImage(getWidth(),getHeight());
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                   pane.setColor(Color.white);
                   pane.fillRect(0,0,getWidth(),getHeight());
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                   pane.setColor(Color.black);
                   drawThickLine(pane,getWidth(),5);
                   fm = g.getFontMetrics(new Font("Arial",Font.BOLD,SIZE));
                   descent = fm.getDescent();
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              int xaxis = START;
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              int counter = 0;
              for (char c: characterList){
                   CharacterPosition cp = new CharacterPosition(c,xaxis, Color.black);
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              for (int j = BOTTOMLINE;j<BOTTOMLINE+1+thickness;j++){
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              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);
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         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();
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         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);
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              charcounter = 0;
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              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();
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      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 certain lines of a text file and boundary testing ...

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