Help with array / indexed property

Hi,
I am trying to save the value of multiple dropdowns in the Session Bean. Therefore, I created an index property "rule" in the Bean.
Each time the page is loadad, a different dropdown appears depending on the previous choices. If the ok button is clicked, the action is performed to save the current dropdown value in the index property:
public String button1_action() {
int cnt = 1;
// if page was loaded before, replace count
if (getAdminBean().getCount() > 0) {
cnt = getAdminBean().getCount() +1;
} else {
// save current count in Session
getAdminBean().setCount(cnt);
setValue("#{AdminBean.rule[cnt-1]}", selectme.getValue());
This is the error message:
Exception Details: javax.faces.el.PropertyNotFoundException
Error setting property '-1' in bean of type null
Possible Source of Error:
Class Name: com.sun.faces.el.PropertyResolverImpl
File Name: PropertyResolverImpl.java
Method Name: setValue
Line Number: 153
I have played around and even the following code would not work to save a value at the first position of the index property:
setValue("#{AdminBean.rule[0]}", selectme.getValue());
Can anyone help?
Thanks,
Nils

You can not set the index as you use here i.e
#{AdminBean.rule[cnt-1]}
is not correct. Because in JSF the "[" is used for some other purpose.
I would suggest you to use another property called "index"
setValue("#{AdminBean.index", cnt-1);
setValue("#{AdminBean.rule", selectme.getValue());
Inside the session bean, in the method setRule get the index (already set) and place your value in the correct indexed array.
Same logic you can use to get the value too
setValue("#{AdminBean.index", cnt-1);
getValue("#{AdminBean.rule");
the method getRule() should get the value for the index and return it.
- WInston
http://blogs.sun.com/roller/page/winston?catname=Creator

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would it output 1 * 1;
2 * 2;...
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devin

Ok...
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operator * cannot be applied to int[] :d
try
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if you were looking for the output stated change
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int[] winners = new int[5];
winners[0] = Lotto.drawBall();
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-> 8
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Here is my incomplete code at this moment:
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import java.util.Scanner;
import java.io.*;
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CountDieFaces.java:19: illegal start of type
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Edited by: Wootens on Oct 18, 2010 8:55 PM

D'oh!
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java.io.*;
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Hi all!
I have just start work with oracle. I have a problem with context index. Please help me. My problem is :
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So you want "/", "-" and "@" to link tokens, but you want "." to break numeric tokens?
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If you want to disable these NUMJOIN and NUMGROUP characters, so that numbers are always split into component tokens, then you can set both of the to the space character (it won't allow NULL or '', which would be more logical in my opinion).
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insert into foo values ('80-3 cong hoa');
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Hi
I have a big problem, i try to make a java class, where i can open a file and add new words, and to sort them in a right order
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The first situation is simpler. Just get an all upper or lower case copy of the strings, and then compare thosepublic int compare(Object o1, Object o2) {
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For the second way, your comparator will need to iterate over each pair of characters. If the characters are equal, ignoring case, then you compare them based on case. You pick whether upper is greater or less than lower.
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Thanks so much for your help.

public class Test {
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       for (int i = 0; i < intArray.length; i++) {
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hi friends
i am a new comer to java and I have been studying Arrays recently. I came across this program on the internet ( thanks to Peter Williams)
package DataStructures;
import java.util.NoSuchElementException;
* An array implementation of a stack
* @author Peter Williams
public class StackArray implements Stack {
private int top; // for storing next item
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stack = new Object[1];
top = 0;
public boolean isEmpty() {
return top == 0;
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if (top == stack.length) {
// expand the stack
Object[] newStack = new Object[2*stack.length];
System.arraycopy(stack, 0, newStack, 0, stack.length);
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figurativelly speaking:
if you take an array and put it standing on your tesk, so that start of array points to floor, and end of array points to roof, then you can start filling that array as stack.
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private static void setDobject(Rectangle [] setrect)
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Part 1 : An Array List of Rectangles
Enter length or 999 to exit: 3
Enter width: 2
Enter length or 999 to exit: 1
Enter width: 2
Enter length or 999 to exit: 10
Enter width: 20
Enter length or 999 to exit: 999
Rectangle: 3.0 by 2.0
Rectangle: 1.0 by 2.0
Rectangle: 10.0 by 20.0
Display Object with added item
Rectangle: 3.0 by 2.0
Rectangle: 1.0 by 2.0
Rectangle: 10.0 by 20.0
Rectangle: 9.0 by 9.0
Displaying Objects with SET item
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size:
0
at java.util.LinkedList.entry(LinkedList.java:365)
at java.util.LinkedList.set(LinkedList.java:328)
at Lab11.setDobject(Lab11.java:129)
at Lab11.main(Lab11.java:78)
Press any key to continue...
finally here is the Rectangle class i'm using:
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LinkedList<Rectangle> rects = new LinkedList<Rectangle>();rects is an empty LinkedList at this point. It has no elements added to it.
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scan.nextLine();
     listOfCities[i]=city;
     System.out.println(listOfCities[i]);
catch (Exception e) {
System.out.println(e);
return listOfCities;
public static void main(String args[]) {
Highway h = new Highway("out-of-order.txt");
h.sortCityArray();

the ouput is perfect according to the print lines if I use (increase the int where j is in the loop manually by one) :
     for(int i=0; i<cityArray.length ;i++)
          if(sortedCityArray[0].getNextCity().equals(cityArray.getCity())){
          sortedCityArray[0+1]=new City(cityArray[i].getCity(),cityArray[i].getNextCity(),cityArray[i].getLengthAB(),cityArray[i].getLengthAroundB(),cityArray[i].getSpeedAB());
          break;
     for(int i=0; i<cityArray.length ;i++)
          if(sortedCityArray[1].getNextCity().equals(cityArray[i].getCity())){
          sortedCityArray[1+1]=new City(cityArray[i].getCity(),cityArray[i].getNextCity(),cityArray[i].getLengthAB(),cityArray[i].getLengthAroundB(),cityArray[i].getSpeedAB());
     break;
          for(int i=0; i<cityArray.length ;i++)
          if(sortedCityArray[2].getNextCity().equals(cityArray[i].getCity())){
          sortedCityArray[2+1]=new City(cityArray[i].getCity(),cityArray[i].getNextCity(),cityArray[i].getLengthAB(),cityArray[i].getLengthAroundB(),cityArray[i].getSpeedAB());
     break;
          for(int i=0; i<cityArray.length ;i++)
          if(sortedCityArray[3].getNextCity().equals(cityArray[i].getCity())){
          sortedCityArray[3+1]=new City(cityArray[i].getCity(),cityArray[i].getNextCity(),cityArray[i].getLengthAB(),cityArray[i].getLengthAroundB(),cityArray[i].getSpeedAB());
     break;
But I cant do this for 200 elements. Are the loops nested right?
Edited by: modplan on Sep 22, 2008 6:49 PM

Need Small Help with Arrays.

I have this question i wanna ask...Could anyone help me with this code.
Assume that the array arr has been declared. how do i write a statement that assigns the next to last � element of the array to the variable x , which has already been declared.

Of course, if you don't know the size until run time, you'll want to check that the array size is greater than 1, else there won't BE a next to last element.

Need some help with Adobe Indexes

Hello Reader forum! I'm looking for help to make our lives in IT easier.
We have about 15 pdf files with pdx or index files setup for quick searching. They reside in seperate folders off of a network share.
Problem is we are about to migrate the share to a new server and about 50 to 60 users have there local installation setup pointing to those shares via \\UNCname. So once we move the share we will have problems, being that we would have to walk to each PC and manually update the index file locations for each user.
So my question/desire is to either copy the specific file that houses the index paths to all of the PC's or perhaps use VB Script to change all of the references automatically.
They should all be on 9.0 reader at least.
Any ideas, suggestions, point me in the right direction would be appreciated.

Ping this up to the top and looking for any help!

Help with arrays...Please Help

Hello,
Iam trying to make a library system. I have three classes, one for the GUI, User class, and Users class. User class instantiates an object with all the relevant data like, Name, Age, Address, etc. The Users class contains a array of User Objects.
With this program I have to be able to create users, display users and delete users. The problem Iam having is displaying them. (I think I correctly store the User Objectsin the array, and Iam having problems retreiving them). The thing is when I run the program I don't get any exception errors, just nothing gets displayed!
Here is part of my code:
public class Users {
//declaring variables
public Users (){
initialiseArray();
public void initialiseArray(){
userArray = new User [50];
// This method first checks to see if there is enough room for a new
// user object. If there is the object is added to the array, if there is'nt
// Then method expandUserArray is called to make room for the user
public void addUser( User user)
if (userArraySize == userArray.length) {
expandUserArray();
userArray[userArraySize] = user;
userArraySize++;
// In this method first the user is searched for in the array, if found
// Then method decreaseUserArray is called to delete the user
public void deleteUser ( User user )
location = 0;
while (location < userArraySize && userArray[location] != user) {
location++;
if (userArray[location] == user) {
decreaseUserArray(location);
public void displayUsers( ){
for (int i = 0; i < userArraySize; i++) {
usersInformation += "\n" + (userArray.getUserName());
usersInformation += "\t" + (userArray[i].getUserID());
usersInformation += "\t" + (userArray[i].getUserAddress());
public String getUserInformation(){
//usersInformation = userInformation.toString();
return usersInformation;
// The User is deleted by shifting all the above users one place down
private void decreaseUserArray(int loc)
userArray[loc] = userArray[userArraySize - 1];
userArray[userArraySize - 1] = null;
userArraySize--;
// This method increase the size of the array by 50%
private void expandUserArray( )
int newSize = (int) (userArray.length * increasePercentage);
User newUserArray[] = new User[newSize];
for (int i = 0; i < userArray.length; i++) {
newUserArray[i] = userArray[i];
userArray = newUserArray;
Is there anything wrong with my arrays??? Here is part of my code for action performed:
void addUserButton_actionPerformed(ActionEvent e) {
newUserName = userNameTextField.getText();
newUserAddress = userAdressTextField.getText();
newUserID = Integer.parseInt ( userIDTextField.getText());
User newUser = new User (newUserName, newUserAddress, newUserID);
Users users = new Users();
users.addUser(newUser);
clearButton();
void displayUsersButton_actionPerformed(ActionEvent e) {
Users users = new Users();
users.displayUsers();
displayUsersTextArea.append (users.getUserInformation());
void deleteUserButton_actionPerformed(ActionEvent e) {
//Still incomplete
Thanks for your help!

First, PLEASE USE THE SPECIAL TOKENS FOUND AT
http://forum.java.sun.com/faq.jsp#messageformat WHEN
POSTING CODE!!!! Sorry about that, Iam new and I did'nt know about Special Tokens.
As far as the problem, let me start out by asking if
you've considered using a class that implements the
List interface. Perhaps Vector or ArrayList would
make a better choice since they already handle
"growing" and "shrinking" for you.I tried using vector arrays but it got too complicated. It was very easy to add and remove objects from the vector but I never figured out how to display all the objects with all the data.
public void displayUsers( ){
for (int i = 0; i < userArraySize; i++) {
usersInformation += "\n" +
" + (userArray.getUserName()); //what is
usersInformation? Also, how does getUserName(),
getUserID(), getUserAddress() know which user object
to operate on if these are methods of userArray?
usersInformation += "\t" +
" + (userArray.getUserID()); //I'm guess you've
only posted "some" of your code.
usersInformation += "\t" +
" + (userArray.getUserAddress());//Try posting all
that you have so far, and please use the special
tokens to format your code.
}I made a mistake while I was cutting & pasting my code. It should be for example:
usersInformation += "\n" (userArray.getUserName());
The comment about instanciating a new Users for each
actionPerformed is on point. You are replacing your
Usres with a new object each time.Yep this was the problem. I just changed the constructor, declared and
created object of Users elsewhere.
Thanks for your help!

Help with Array of Arrays

import java.util.Arrays;
import java.util.Date;
import java.util.List;
public class StockDay
    private String[] stockDayData;
    List stockDays = new ArrayList();
    public StockDay(String stockData)
        stockDayData = new String[6];
        String[] stockDayData= stockData.split(",");
        stockDays.add(stockDayData[]);
}I have an outside class calling this class with a string of data separated by commas. I am trying to separate the data so that each time the method is called, each piece of the data (6 total) is put into an array list. Then that array list is put into an array list of arrays. I am sorry if I have not made this clear, I will try again. I want an array of arrays, and the interior arrays will contain 6 pieces of information each from the string that is given to the method, and each separated by commas.
Any help is much appreciated. I am also curious how I can accesses one piece of the data at a time, this is what I am thinking for this:
data = arraylist1[#].arraylist2[#]this would set data equal to whatever is in arraylist2[#]
Thank you very much.

ActingRude wrote:
I meant just a simple Array I guess.Note the difference between Array and array. Class names start with uppercase in java. There is a class called Array, but it's just a utility class, and isn't part of arrays.
.. like I am using above? I was under the impression that the biggest syntax difference between an array(fixed number of items) and an ArrayList(unfixed number of items) was the use of the [] and () That's one of many syntactical differences, yes, but the main difference is not in the syntax. arrays are part of the Java language, have special handling because of that, and are faster and smaller than ArrayLists. ArrayList is part of the API, and didn't exist until Java 1.2 (about 5-6 years into Java's life, I think), and is built on top of an array.
UnsupportedOperationException:
null (in java.util.AbstractList)I have no idea what is causing this, I can only assume that I am doing something wrong...It looks like you're tyring to add null to an ArrayList and it doesn't like it. I thought ArrayList accepted null elements, but I could be wrong. Paste in the exact line that's causing it, and any declarations necessary to clarify any variables used on that line.

Help with array / indexed property

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