Array out of bound - weird
Hi,
I have spent quite sometime testing this but the result I am getting is not right and weird.
I have an array of classes of size 5
Table myTable = new Table[5];
I then use a for loop to initialize myTable class as:
for(int i=1; i<=myTable.length; i++)
myTable[i] = new myTable(i);
Is there anything wrong with that? For some reason I am getting array out of bound exception complaining that 5 is out of bound which is not.
Can anybody tell me what is wrong with this?
This is very simple and I am not even sure why I am getting this out of bound exception.
Thanks.
Abu_Muhammad wrote:
Can you try to run this?
int [] intarray = new int[6];
for(int i=1; i<6; i++)
System.out.println("value of i is " + i);
intarray[i] = i;
System.out.println("value of array is " + intarray);
This doesnt give an exception nor does the index start from 0. Then why doesnt the other loop work or why this works?
i < 6 means the loop will continue executing as long as i is less than 6. Once i reaches 5, the loop will break. If you used intarray.length there wouldn't be an ArrayIndexOutOfBounds exception, but nothing would happen to index 0, as you've missed it.
Edited by: xcd on Mar 23, 2010 3:11 PM
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Array out of bounds exception when outputting array to file
Could someone please tell me why i'm getting this array out of bounds exception?
public class Assignment1 {
public static void main(String[] names)throws IOException {
BufferedReader keyboard = null;
String userChoice;
String inputFile = null;
String studentData;
String searchFile = null;
String searchName;
String stringIn;
PrintWriter outputFile;
FileWriter fWriter = null;
BufferedReader fReader = null;
int first;
int last;
int mid;
int midValue;
int i;
int number;
// creates keyboard as a buffered input stream
keyboard = new BufferedReader(new InputStreamReader(System.in));
//prompts user to choose 1 or 2 to make a corresponding choice
System.out.println("Please Enter: ");
System.out.println("1 to Create a File: ");
System.out.println("2 to Search a File: ");
userChoice = keyboard.readLine(); //user enters 1 or 2
// converts a String into an int value
number = Integer.parseInt(userChoice);
fReader = new BufferedReader(new FileReader("studentData.txt"));
if (number == 1) {
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i=0;
//keep looping till sentinel
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System.out.println("Enter a name and press Enter. " +
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studentData = keyboard.readLine();
//loop for putting the names into the array
for(i=0; i<names.length; i++) ;
outputFile.println(names);
} [b]outputFile.close();package assignment1;
import java.io.*;
import java.util.*;
public class Assignment1 {
public static void main(String[] names)throws IOException {
BufferedReader keyboard = null;
String userChoice;
String inputFile = null;
String studentData;
String searchFile = null;
String searchName;
String stringIn;
PrintWriter outputFile;
FileWriter fWriter = null;
BufferedReader fReader = null;
int first;
int last;
int mid;
int midValue;
int i;
int number;
// creates keyboard as a buffered input stream
keyboard = new BufferedReader(new InputStreamReader(System.in));
//prompts user to choose 1 or 2 to make a corresponding choice
System.out.println("Please Enter: ");
System.out.println("1 to Create a File: ");
System.out.println("2 to Search a File: ");
userChoice = keyboard.readLine(); //user enters 1 or 2
// converts a String into an int value
number = Integer.parseInt(userChoice);
fReader = new BufferedReader(new FileReader("studentData.txt"));
if (number == 1) {
System.out.println("Please Enter the File Name to Create: ");
studentData = keyboard.readLine();
File file = new File("studentData.txt");
fWriter = new FileWriter("studentData.txt");
outputFile = new PrintWriter(fWriter);
names = new String[200];
i=0;
//keep looping till sentinel
while (studentData.equals("end") && studentData != null &&
i < names.length) {
if (studentData.equals("end")) break; //break and call sort
System.out.println("Enter a name and press Enter. " +
"Type 'end' and press Enter when done: ");
studentData = keyboard.readLine();
//loop for putting the names into the array
for(i=0; i<names.length; i++) ;
outputFile.println(names);
} outputFile.close();
//call selectionSort() to order the array
selectionSort(names);
// Now output to a file.
fWriter = new FileWriter("studentData.txt");
outputFile = new PrintWriter(fWriter);
} else if (number == 2) {
System.out.println("Please Enter a File Name to search: ");
searchFile = keyboard.readLine();
inputFile = ("studentData.txt");
} if (searchFile == "studentData.txt") {
// Input from a file. See input file streams.
fReader = new BufferedReader(new FileReader("studentData.txt"));
System.out.println("Please enter a Name to search for: ");
searchName = keyboard.readLine();
//enter binary search code
first = 0;
last = 199;
while (first < last)
mid = (first + last)/2; // Compute mid point.
if (searchName.compareTo(names[mid]) < 0) {
last = mid; // repeat search in bottom half.
} else if (searchName.compareTo(names[mid]) > 0) {
first = mid + 1; // Repeat search in top half.
} else {
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System.out.println("The Name IS in the file.");
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System.out.println("The Name IS NOT in the file.");
} else //if userChoice != 1 or 2, re-prompt then start over
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public static void selectionSort(String[] names) {
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int smallIndex;
int pass, j = 1, n = names.length;
String temp;
for (pass = 0; pass < n-1; pass++)
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do {
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smallIndex = pass;
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for (j = pass+1; j < n; j++)
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smallIndex = j;
temp = names[pass]; //swap
names[pass] =names[smallIndex];
names[smallIndex] = temp;
} while (j <= names.length);
//File file = new File("studentData.txt");
This is the output window:
init:
deps-jar:
compile:
run:
Please Enter:
1 to Create a File:
2 to Search a File:
1
Please Enter the File Name to Create:
test
Exception in thread "main" java.lang.NullPointerException
at assignment1.Assignment1.selectionSort(Assignment1.java:134)
at assignment1.Assignment1.main(Assignment1.java:73)
Java Result: 1
BUILD SUCCESSFUL (total time: 9 seconds) -
Deck Class, array out of bounds
I keep getting an "array out of bounds" exception when I run the program. I tried to make the array 666666 instead of just 52 and i still get that error. HELP!! ,
IM ONLY HAVING PROBLEMS WITH THE SHUFFLE METHOD
By the way, this time i REALLY cleaned up the class and It compliles correctly so it would help if you guys that posted last time would take a look at it again.
(and I know that the name of the class shoudl be card or something but MY teacher wanted it to be deck)
Any help greatly appreciated and if you see any other errors in logic or code please tell me!
this is the testing class im using
public class DeckTester{
public static void main ( String[] args ){
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System.out.println(" ");
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Deck.printDeck ( newDeck );
}and this is the deck class
import java.lang.Math;
class Deck
int suit, rank;
/////////////////////////////////////////// CONSTRUCTORS
public Deck () {
this.suit = 0; this.rank = 0;
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/////////////////////////////////////////// PRINT CARD
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String[] ranks = { "narf", "Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King" };
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public static Deck[] makeDeck(){
int index = 0;
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for (int rank = 1; rank <= 13; rank++) {
deck[index] = new Deck (suit, rank);
index++;
return deck;
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public static void printDeck (Deck[] deck) {
for (int i=0; i<deck.length; i++) {
printCard (deck);
/////////////////////////////////////////// PRINT FIRST 5
public static void printFirstFive (Deck[] deck){
int x = -1;
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private static int numberCard() {
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from each hand. In shuffling it is not always the
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else if( percent >= 70 && percent <=79 ){
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else if( percent >= 80 && percent <=84 ){
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else if( percent >= 85 && percent <=89 ){
numberCards = 6;}
else if( percent >= 90 && percent <=92 ){
numberCards = 7;}
else if( percent >= 93 && percent <=95 ){
numberCards = 8;}
else if( percent >= 96 && percent <=97 ){
numberCards = 9;}
else{ numberCards = 10; }
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}//end numberCards METHOD
/////////////////////////////////////////// END CLASS
}//end class
/////////////////////////////////////////// ENDWooo, you;ve made this far to complicated. Lets start with a class called Card, let just imagine this exists, we won;t go into any more detail. Now lets look at a class called Deck, which has a collection of cards.
class Deck {
private java.util.Vector cards = new java.util.Vector();
Deck() {
for (int i = 0; i < 52, i++) {
cards.add(new Card(i));
} //this method adds 52 cards to the vector
public Card getCardAt(i) {
return (Card) cards.removeElementAt(i); //can't remember exact method
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int index = Random.nextInt() * 52;
return getCardAt(index);
public int getSize() {
return cards.size();
}Okay, this method has 52 cards and you can either get one at the specificed index or get a random card. Because the cards are removed when they are returned you will never get the same card twice. There is no point in shuffling them if you just return a random card ;)
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while (d.getSize() > players.length) {
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Always remember the KISS process:
Keep It Simple, Stupid :) -
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Good evening all,
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I read the arrays tutorial and understand all that's described there but with what I've learned you have to start your array out at zero like I did. Should I use the variable name that I gave it in lieu of zero?No. The point is that since you didn't provide any arguments when you started your program, there is no arr[0] or arr[anything else]. It doesn't matter if you put an int literal between the brackets or a variable or a method that returns int. You can't access elements that don't exist.
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I have an applet on my website which behaves perfectly when I view the page using my home Mac (iBook running Panther).
When I view the same page with a Windows machine at my local library I get an Array Bounds error.
'Advanced options' is disabled (and anyway I am not familiar with Windows) so I can't get any more specific information.
Can anyone suggest what I should do next?
To see the error go to www.hrat.btinternet.co.uk
then click on Interactive EEG Atlas
then click on Currently available EEG records
finally pick any record eg. male age 58
the Mac shows an 8 channel EEG record (wiggly lines)
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HRT
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It is possible that N might still be 0 in which case mArrays[0] would be undefined.
This could happen (I think only happen) if the following method did not function
i.e. no word was found and the method exited with eof=true :-
public void findWord(String theWord)
do // skip until the parameter word is found
tok=readToken();
if (tok==theFileTokenizer.TT_EOF)
// System.out.println("eof in findword "+theWord);
eof=true;
return;
} while (((tok!=theFileTokenizer.TT_WORD)
& (theFileTokenizer.sval!=theWord)));
// System.out.println("Find "+theWord+" Tok "+tok+" word="+theFileTokenizer.sval);
Class theFileTokenizer is set up on opening the file
public void openMontagefile()
URL url = null;
try // sets up the Tokenizer
url = new URL (getCodeBase()+"EEGfolder/"+theMontagefolder+"/montages.txt");
URLConnection uc = url.openConnection();
uc.connect();
is = uc.getInputStream();
theFileTokenizer = new StreamTokenizer(is);
theFileTokenizer.eolIsSignificant(true);
theFileTokenizer.slashStarComments(true);
catch (Exception e)
System.out.println("Can't read Montage data " + e);
// System.out.println("Montage file opened");
and my best guess so far is that in some Java VM implementations StreamTokenizer is wrongly
(or differently) implemented.
Does all this make sense?
HRT -
Array Out of Bounds Exception. Where?
Hello,
I am developing an application using Visual Cafe 3.0. The application access a file every minute to read a new line and show data in a MultiList. First the code reads the header of the file to get all options, and then reads a new line avery minute to get results for that options.
It is something like this:
Option1, option2, option3,...
1234, 45, 0, ...
532, 23, 2, ...
and so on...
Code is quite large, and I call a method which is generating the exception (java.lang.ArrayOutofBoundsException). Exception is reached after a random number of calls to that method each time.
I have some variables declared in the method and some other declared outside of that method because I use them in other part of the code.
I catch the exception in the method which calls this method (outside following code)
Here is the method that is failing.
Please can anyone see where is the code reaching that exception?
//These are variables used outside the method
String[] lista_op = new String[100];
boolean[] lista_bo = new boolean[100];
String[] lista_va = new String[100];
int n_opciones = 0;
int lon = 0;
char[] resultados;
//And this is the method
//Basically I pass a line of text to the method and the length (actually I am not using that variable and some others)
//Length of all arrays is 100, but number of used items is about 50
public void results(char[] resultados, int lon)
int opciones = 0;
int i = 0;
int j = 0;
int n = 0;
int c = 0;
int b = 0;
int z = 0;
int datoentero = 0;
int datoanterior = 0;
char coma = ',';
String dato = "";
String vacio = "";
String datoantes = "";
String cadena1 = "";
String cadena2 = "";
//int[] pos = new int[100];
multilista.adjustHeadings();
//Bucle de busqueda de opciones seleccionadas y
//extraccion de datos
while (c < n_opciones){
if (lista_bo[c] == false){
lista_va[b] = lista_op[c];
//pos[b] = c;
n = c + 3;
// Bucle de busqueda de resultados
for ( j = 0; i < n; j++){
if (resultados[j] == coma){
i++;
i = 0;
while (resultados[j] != coma){
dato = dato + resultados[j];
j++;
// Fin de bucle de busqueda de resultados
cadena1 = lista_va;
datoentero = Integer.parseInt(dato);
//textArea1.append(" " + datoentero);
while (z < Lista_seleccion.getItemCount()){
cadena2 = Lista_seleccion.getItem(z);
if (cadena1.equals(cadena2)){
datoantes = multilista.getCellText(z, 1);
if (!datoantes.equals(vacio)){
//textArea1.append("&" + datoantes + "&");
datoanterior = Integer.parseInt(datoantes);
datoentero = datoentero + datoanterior;
multilista.addTextCell(z, 1, Integer.toString(datoentero));
//grafica(datoentero, z);
//notificar(datoentero, z);
z++;
z = 0;
//textArea1.append(" " + dato + " " + c + " " + n);
b++;
c++;
dato = "";
//Fin de bucle de busqueda de opciones seleccionadas
opciones = Lista_seleccion.getItemCount();
while (i < opciones){
multilista.addTextCell(i, 0, Lista_seleccion.getItem(i));
i++;The piece of code I showed before works for me when I do
System.out.println(sw.toString());
I haven't tried to append it to a text area, but if you say it gives you problem you could try with this:
// .. keeping the first 3 lines of my previos code
StringTokenizer st = new StringTokenizer(sw.toString());
while (st.hasMoreTokens()) {
textArea.append(st.nextToken());
textArea.append("\n"); // newline
} -
Struts Issue with Array out of bounds.
Hi all I am having a struts issue trying to work with indexedProperty, mostly because I don't quite follow what the eception is saying here. I am not certain how to interpret the values given to me here. Hopefully someone can point out the braindead thing that I am missing, thanks in advance. I have been fightinging with this one for a while and unfortunately haven't had much luck on the struts mailing list, so I am hoping someone here might be able to give me the nugget of information that I am missing.
java.lang.IndexOutOfBoundsException: Index: 6, Size: 0
java.util.ArrayList.RangeCheck(ArrayList.java:546)
java.util.ArrayList.get(ArrayList.java:321)
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:433)
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:340)
org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:684)
org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:884)
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:816)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)Hi all I am having a struts issue trying to workwith
indexedProperty, mostly because I don't quitefollow
what the eception is saying here. I am notcertain
how to interpret the values given to me here.
Hopefully someone can point out the braindeadthing
that I am missing, thanks in advance. I have
been
fightinging with this one for a while and
unfortunately haven't had much luck on thestruts
mailing list, so I am hoping someone here mightbe
able to give me the nugget of information that Iam
missing.
java.lang.IndexOutOfBoundsException: Index: 6,Size:
0Well, your array has a size of 0, but you'reasking
for the 7th item (yourArray[6])
That's likely not very helpful, but it's all I gotYou're right it isn't really that helpful, but i do
appreciate your taking a moment to reply. The part
that is really confusing me is how on earth it is
making it to the 6th position before it has a problem
as this is an array of size 100 and I iterate through
the entire thing. Well, the array that is causing this error not an array of size 100, it's an array of size 0. So I'm curious as to what array it's complaining about... -
I've seen several posts here and did a search of this but still haven't seen a fix for it.
I have a large object view with a nested synthetic table. The parent table has about 130 columns, the child about 70. If I use xmlGen.getxml and select say, 'select cust_no from invoices_ov where invno = 10024' then that will create my document. Actually I can get all of the parent columns in the select. If however I select * from the view, I get the following:
<?xml version = '1.0'?>
<ERROR_RESULT>oracle.xml.sql.OracleXMLSQLException: java.lang.ArrayIndexOutOfBou
ndsException</ERROR_RESULT>
In my search on the error I see that xmlgen has been getting this error since 1999 (I didn't even know xmlgen was around in 99).
Does this problem have a fix? Is it a parser error? Is it just the number of columns?
BTW, I am using all of the latest availble XML downloads on oracle 8.1.6.1.2. Plenty of memory on client and server. With the invno = 10024, it will only return 1 parent record and 1 child record.
I also have another object just like this (master detail) that works great. It only has about 50 columns.
Thanks,
LewisI worked on this and got a work around. Apparently, I made a change to the type and that's when it started erroring out. What I do now when I make a change is recreate the type and the object view, exit sql*plus, re-enter sql*plus and re-run xmlgen. Oddly enough that fixed it. I logged a tar on this and gave them a script to recreate it. The tar # is 1104094.996.
-
J2EE Deployment - Array Out of Bounds exception
Hi,
I have a problem with JDev 10.1.2 (1811). When I try and deploy a standard J2EE application (built using Struts / EJB, nothing particularly fancy) I get the error message:
Target platform is Standard J2EE.
java.lang.ArrayIndexOutOfBoundsException: 20086
at oracle.ide.net.JarIndex.buildIndex(JarIndex.java:410)
at oracle.ide.net.JarUtil.getJarIndex(JarUtil.java:197)
(etc)The funny thing is, it was working right up until this morning. It's been in development for a couple of months now and it's been working fine. The only thing I did this morning is add in some input validation (i.e., add in one more class). It all compiles fine. One thing that did happen is, is deploy the WAR file by mistake, and then immediately try and deploy the EAR file from the same deployment profile. If the WAR file was still deploying, I don't know whether that would have messed anything up!
Deployment works on another project though (in another workspace).
anyone have any ideas?
Thanks!
PhillOk, I feel rather stupid. I had two projects, 'Model' and 'ViewController'. I'd cleaned out the 'deploy' directory on the View Controller, but had forgotten to clean out the deploy directory on the 'Model' project. Clearing it out worked!
Strange error message though.
Thanks! -
Out of bounds error with an array.
Dear all,
java.lang.ArrayIndexOutOfBoundsException: 1
I keep getting this error message when I try and use a for loop to step through an array of which the upper bound is 'count'.
I feel as if I have tried all permutations of spelling out the possible values of the vertices, using .length etc but all to no avail.
Here is one bit of code that is getting this error:
public String toString(){
int i = 0;
for (i = 0; i == count; i++);{
System.out.println (+ vertices.getX() + + vertices[i].getY());
return "";
The reason for the return "" is to get rid of another error that used to say no return value.
I'll happily try any suggestions, I just want to get my program working.
Thanks
PS I have read through the recent postings on this but I can't see how they answer my query.Thanks for spotting the semi colon in the wrong place it seems to have sorted out that bit, but I've now got another array out of bounds exception 0 on a different bit.
public double perimeter (){
double perimeter = 0;
//int i = 0;
for ( int i = 0; i < (count -1) ; i++){
perimeter = perimeter + ( vertices.distance(vertices[i + 1]));
perimeter = perimeter + ( vertices[0].distance(vertices[count]));
return perimeter;
This bit of code is supposed to calculate the perimeter of any polygon. So my algorithm was to start at vertices[0] use the distance method to calculate the distance between that one and the next one all the way up to the last one in the array vertices[count]. And then calculate the distance from the first vertice to the last and add that on to make the total.
The line that is being spat out is
perimeter = perimeter + ( vertices.distance(vertices[i + 1]));
I can't see why.
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