Array of cfc object help

I just picked up coldfusion about a month ago, so my
coldfusion lingo sucks. I have been programming in C++ for over 5
years now and will be using a lot of C++ terminology to help avoid
any confusion. I am writing a cfc function that preforms web
servicing. This function needs to return an object/class that is
defined in another coldfusion function. I can do this without a
problem if I only need to return one instance of this object.
However, I cannot seem to return an array of this object (I need to
return multiple instances of this object, kind of like a query, but
for programming purposes it needs to stay as an object).
It seems that the webservicing function hates my return type.
If I try to make an array of the object, it does not like array or
the object as the return type. However, when I take this function
out of the cfc, and make it a cfm, it gets the array of objects
just fine. So, I think I am having issues with the return type on
the <cffunction> tag. So I came up with the idea of creating
another object which will hold an array of the first object and
using the second object as the return type. Here is some psuedo
code of the function I am working on:
<cffunction name="SelectGames" access="remote"
returntype="ArrayOfGames" output="false">


<cfobject component = "myArray" name>
<cfobject component="games" name="test">
<cfset counter = 0>
<cfloop query="getevents">
<cfset counter = counter + 1>
<cfset test.Game_id = event_id>
<cfset test.gameDate = eventdate>
<cfset test.Starttime = starttime>
<cfset test.Place = place>
<cfset test.Level = level>
<cfset test.Sport = sport>
<cfset test.Gender = division>
<cfset test.Opponent = opponent_id>
<cfset test.Type = type>
<cfset test.Link = spec_name>
<cfset myArray.gamesArray[counter] = test>
</cfloop>
<cfreturn myArray>
</cffunction>
It keeps telling me that it does not recognize the return
type.
Here are examples of the two objects I am using from the 2
dif. cfc files:
<cfcomponent>
<cfproperty name="gamesArray" type="array">
</cfcomponent>
<cfcomponent>
<cfproperty name="Game_id" type="numeric">
<cfproperty name="gameDate" type="date">
<cfproperty name="Starttime" type="string">
<cfproperty name="Place" type="string">
<cfproperty name="Level" type="string">
<cfproperty name="Sport" type="string">
<cfproperty name="Gender" type="string">
<cfproperty name="Opponent" type="string">
<cfproperty name="Type" type="string">
<cfproperty name="Link" type="string">
</cfcomponent>
Feel free to post any questions to clear anything up, I know
this is confusing and I probably did a poor job of explaining my
problem. Also, if I throw this code into a cfm and try to make an
array of games, it works, this is the code I got it to work with:
<cfset myArray = newArray(1)>
<cfloop query="getevents">
<cfset counter = counter + 1>
<cfset test.Game_id = event_id>
<cfset test.gameDate = eventdate>
<cfset test.Starttime = starttime>
<cfset test.Place = place>
<cfset test.Level = level>
<cfset test.Sport = sport>
<cfset test.Gender = division>
<cfset test.Opponent = opponent_id>
<cfset test.Type = type>
<cfset test.Link = spec_name>
<cfset myArray[counter] = test>
</cfloop>
I guess my problem is I do not know how to specify a type for
an array.

The return type of this FUNCTION would be returnType="array".
No matter
what kind of data the array contained.
That's what I get for fast proofing.
Ian Skinner wrote:
> I would have to play with your code more if this does
not clear it up
> for you, but lets start with this simple concept first.
>
> You mentioned "typing the array" several times.
ColdFusion is typeless,
> you don't type an array, it is just array. An array of
strings is the
> same as an array of integers which is the same as an
array of objects.
>
> So if you had a function something like this.
>
> <cffunction returnType="array" ...>
> <cfset theArray = arrayNew()>
>
> <cfloop ...>
> <cfset arrayAppend(theArray, newObject)>
> </cfloop>
>
> <cfreturn theArray>
> </cffunction>
>
> The return type of this function would be
returnType="array". No matter what
> kind of data the array contained.
>
> mwiley63 wrote:
>> I just picked up coldfusion about a month ago, so my
coldfusion lingo
>> sucks. I have been programming in C++ for over 5
years now and will
>> be using a lot of C++ terminology to help avoid any
confusion. I am
>> writing a cfc function that preforms web servicing.
This function
>> needs to return an object/class that is defined in
another coldfusion
>> function. I can do this without a problem if I only
need to return
>> one instance of this object. However, I cannot seem
to return an
>> array of this object (I need to return multiple
instances of this
>> object, kind of like a query, but for programming
purposes it needs to
>> stay as an object).
>> It seems that the webservicing function hates my
return type. If I
>> try to make an array of the object, it does not like
array or the
>> object as the return type. However, when I take this
function out of
>> the cfc, and make it a cfm, it gets the array of
objects just fine.
>> So, I think I am having issues with the return type
on the
>> <cffunction> tag. So I came up with the idea
of creating another
>> object which will hold an array of the first object
and using the
>> second object as the return type. Here is some
psuedo code of the
>> function I am working on:
>>
>> <cffunction name="SelectGames" access="remote"
>> returntype="ArrayOfGames" output="false">
>> 
>> 
>> <cfobject component = "myArray" name>
>> <cfobject component="games" name="test">
>> <cfset counter = 0>
>> <cfloop query="getevents">
>> <cfset counter = counter + 1>
>> <cfset test.Game_id = event_id>
>> <cfset test.gameDate = eventdate>
>> <cfset test.Starttime = starttime>
>> <cfset test.Place = place>
>> <cfset test.Level = level>
>> <cfset test.Sport = sport>
>> <cfset test.Gender = division>
>> <cfset test.Opponent = opponent_id>
>> <cfset test.Type = type>
>> <cfset test.Link = spec_name>
>> <cfset myArray.gamesArray[counter] = test>
>> </cfloop>
>> <cfreturn myArray>
>> </cffunction>
>>
>> It keeps telling me that it does not recognize the
return type.
>> Here are examples of the two objects I am using from
the 2 dif. cfc
>> files:
>> <cfcomponent>
>> <cfproperty name="gamesArray" type="array">
>> </cfcomponent>
>> <cfcomponent>
>> <cfproperty name="Game_id" type="numeric">
>> <cfproperty name="gameDate" type="date">
>> <cfproperty name="Starttime" type="string">
>> <cfproperty name="Place" type="string">
>> <cfproperty name="Level" type="string">
>> <cfproperty name="Sport" type="string">
>> <cfproperty name="Gender" type="string">
>> <cfproperty name="Opponent" type="string">
>> <cfproperty name="Type" type="string">
>> <cfproperty name="Link" type="string">
>> </cfcomponent>
>>
>> Feel free to post any questions to clear anything
up, I know this is
>> confusing and I probably did a poor job of
explaining my problem.
>> Also, if I throw this code into a cfm and try to
make an array of
>> games, it works, this is the code I got it to work
with:
>> <cfset myArray = newArray(1)>
>> <cfloop query="getevents">
>> <cfset counter = counter + 1>
>> <cfset test.Game_id = event_id>
>> <cfset test.gameDate = eventdate>
>> <cfset test.Starttime = starttime>
>> <cfset test.Place = place>
>> <cfset test.Level = level>
>> <cfset test.Sport = sport>
>> <cfset test.Gender = division>
>> <cfset test.Opponent = opponent_id>
>> <cfset test.Type = type>
>> <cfset test.Link = spec_name>
>> <cfset myArray[counter] = test>
>> </cfloop>
>>
>> I guess my problem is I do not know how to specify a
type for an array.
>>

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For the benefit of others, here is Deck displayed with code tags:
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InputObject SideIndicator
@{Agent= Virtual Server in vCenterServer; Backupse... <=
What I am trying to get is just the name of the server, which should be $arrDifferent[0] or possibly $arrDifferent.Client. Once I have the name(s) of the servers that are different, then I can do stuff with that. So either I am not accessing the array
right, building the array right, or using Compare-Object correctly.
Thank you!
Sample opening lines from the report
" CommCells > myComCellServer (Reports) >"
" myComCellServer -"
" 30 day SLA"
CommCell Details
" Client"," Agent"," Instance"," Backupset"," Subclient"," Reason"," Last Job Id"," Last Job End"," Last Job Status"
" myServerA"," vCenterServer"," VMware"," defaultBackupSet"," default"," No Job within SLA Period"," 496223"," Nov 17, 2014"," Killed"
" myServerB"," Oracle Database"," myDataBase"," default"," default"," No Job within SLA Period"," 0"," N/A"," N/A"
Entire script
# things to add
# what date was server entered in list
# how many days has server been on list
# add temp.status = pre-existing, new, removed from list
# copy sla_master before making changes. Copy to archive folder, automate rolling 90 days?
## 20150114 Created script ##
#declare global variables
$global:arrNewServers = @()
$global:arrMasterServers = @()
$global:countNewServers = 1
function Get-NewServers
Param($path)
Write-Host "Since we're skipping the 1st 6 lines, create test to check for opening lines of report from CommVault."
write-host "If not original report, break out of script"
Write-Host ""
#skip 5 to include headers, 6 for no headers
(Get-Content -path $path | Select-Object -Skip 6) | Set-Content $path
$sourceNewServers = get-content -path $path
$global:countNewServers = 1
foreach ($line in $sourceNewServers)
#declare array to hold object temporarily
$temp = @{}
$tempLine = $line.Split(",")
#get and assign values
$temp.Client = $tempLine[0].Substring(2, $tempLine[0].Length-3)
$temp.Agent = $tempLine[1].Substring(2, $tempLine[1].Length-3)
$temp.Backupset = $tempLine[3].Substring(2, $tempLine[3].Length-3)
$temp.Reason = $tempLine[5].Substring(2, $tempLine[5].Length-3)
#write temp object to array
$global:arrNewServers += New-Object -TypeName psobject -Property $temp
#increment counter
$global:countNewServers ++
Write-Host ""
$exportYN = Read-Host "Do you want to export new servers to new master list?"
$exportYN = $exportYN.ToUpper()
if ($exportYN -eq "Y")
$exportPath = Read-Host "Enter full path to export to"
Write-Host "Exporting to $($exportPath)"
foreach ($server in $arrNewServers)
$newtext = $Server.Client + ", " + $Server.Agent + ", " + $Server.Backupset + ", " + $Server.Reason
Add-Content -Path $exportPath -Value $newtext
function Get-MasterServers
Param($path)
$sourceMaster = get-content -path $path
$global:countMasterServers = 1
foreach ($line in $sourceMaster)
#declare array to hold object temporarily
$temp = @{}
$tempLine = $line.Split(",")
#get and assign values
$temp.Client = $tempLine[0]
$temp.Agent = $tempLine[1]
$temp.Backupset = $tempLine[2]
$temp.Reason = $tempLine[3]
#write temp object to array
$global:arrMasterServers += New-Object -TypeName psobject -Property $temp
#increment counter
$global:countMasterServers ++
function Compare-NewAgainstMaster
Write-Host "Total entries (arrMasterServers): $($countMasterServers)"
Write-Host "Total entries (arrNewServers): $($countNewServers)"
Write-Host "Comparing new against master"
#Compare-Object $arrMasterServers $arrNewServers
$arrDifferent = @(Compare-Object $arrMasterServers $arrNewServers)
Write-Host "There are $($arrDifferent.Count) differences."
foreach ($item in $arrDifferent)
$item
## BEGIN CODE ##
cls
$getMasterServersYN = Read-Host "Do you want to get master servers?"
$getMasterServersYN = $getMasterServersYN.ToUpper()
if ($getMasterServersYN -eq "Y")
$filePathMaster = Read-Host "Enter full path and file name to master server list"
$temp = Test-Path $filePathMaster
if ($temp -eq $false)
Read-Host "File not found ($($filePathMaster)), press any key to exit script"
exit
Get-MasterServers -path $filePathMaster
$getNewServersYN = Read-Host "Do you want to get new servers?"
$getNewServersYN = $getNewServersYN.ToUpper()
if ($getNewServersYN -eq "Y")
$filePathNewServers = Read-Host "Enter full path and file name to new server list"
$temp = Test-Path $filePathNewServers
if ($temp -eq $false)
Read-Host "File not found ($($filePath)), press any key to exit script"
exit
Get-NewServers -path $filePathNewServers
#$global:arrNewServers | format-table client, agent, backupset, reason -AutoSize
#Write-Host ""
#Write-Host "Total entries (arrNewServers): $($countNewServers)"
#Write-Host ""
#$global:arrMasterServers | format-table client, agent, backupset, reason -AutoSize
#Write-Host ""
#Write-Host "Total entries (arrMasterServers): $($countMasterServers)"
#Write-Host ""
Compare-NewAgainstMaster

do not do this:
$arrDifferent = @(Compare-Object $arrMasterServers $arrNewServers)
Try this:
$arrDifferent = Compare-Object $arrMasterServers $arrNewServers -PassThru
¯\_(ツ)_/¯
This is what made the difference. I guess you don't have to declare arrDifferent as an array, it is automatically created as an array when Compare-Object runs and fills it with the results of the compare operation. I'll look at that "pass thru" option
in a little more detail. Thank you very much!
Yes - this is the way PowerShell works. You do not need to write so much code once you understand what PS can and is doing.
¯\_(ツ)_/¯

How to pass Array of Java objects to Callable statement

Hi ,
I need to know how can I pass an array of objects to PL/SQL stored procedure using callable statement.
So I am having and array list of some object say xyz which has two attributes string and double type.
Now I need to pass this to a PL/SQL Procedure as IN parameter.
Now I have gone through some documentation for the same and found that we can use ArrayDescriptor tp create array (java.sql.ARRAY).
And we will use a record type from SQL to map this to our array of java objects.
So my question is how this mapping of java object's two attribute will be done to the TYPE in SQL? can we also pass this array as a package Table?
Please help
Thanks

I seem to remember that that is in one of Oracle's online sample programs.
http://www.oracle.com/technology/sample_code/tech/java/sqlj_jdbc/index.html

How to call a method using a array of that object?

hey, another array question
for example i have 2 classes one name class and a driver
inside the name class i have method that gets the name
public Name getName1( ) {return name1;}
my question is if i created an array of Name objects in my driver with the following line
Name [ ] n1 = new Name [ ] ;
and i wanna call methods inside the name class using my array of Name that i created how do i do it?
thanks in advance

thanks for the reply Maxx
another question regarding arrays
for example if im doing an array of objects Name[ ] n1 = new Name [ ]
and i have a method that removes the name if its the same as the user input
if (n1[ i ].getName.equals(myName))
/ / if they equal it removes it,
else,
/ / the n[ 1 ] stays the same
ive search the forum for previous questions on this but their examples doesnt seems to work, can anyone help? also if end up using this remove method that checks the elements in n1 if it matches it will remove it what should i do to avoid nullpointerexceptions if i wanna shift it all down?
thanks in advance

Passing Array of java objects to and from oracle database-Complete Example

Hi all ,
I am posting a working example of Passing Array of java objects to and from oracle database . I have struggled a lot to get it working and since finally its working , postinmg it here so that it coudl be helpful to the rest of the folks.
First thinsg first
i) Create a Java Value Object which you want to pass .
create or replace and compile java source named Person as
import java.sql.*;
import java.io.*;
public class Person implements SQLData
private String sql_type = "PERSON_T";
public int person_id;
public String person_name;
public Person () {}
public String getSQLTypeName() throws SQLException { return sql_type; }
public void readSQL(SQLInput stream, String typeName) throws SQLException
sql_type = typeName;
person_id = stream.readInt();
person_name = stream.readString();
public void writeSQL(SQLOutput stream) throws SQLException
stream.writeInt (person_id);
stream.writeString (person_name);
ii) Once you created a Java class compile this class in sql plus. Just Copy paste and run it in SQL .
you should see a message called "Java created."
iii) Now create your object Types
CREATE TYPE person_t AS OBJECT
EXTERNAL NAME 'Person' LANGUAGE JAVA
USING SQLData (
person_id NUMBER(9) EXTERNAL NAME 'person_id',
person_name VARCHAR2(30) EXTERNAL NAME 'person_name'
iv) Now create a table of Objects
CREATE TYPE person_tab IS TABLE OF person_t;
v) Now create your procedure . Ensure that you create dummy table called "person_test" for loggiing values.
create or replace
procedure give_me_an_array( p_array in person_tab,p_arrayout out person_tab)
as
l_person_id Number;
l_person_name Varchar2(200);
l_person person_t;
l_p_arrayout person_tab;
errm Varchar2(2000);
begin
     l_p_arrayout := person_tab();
for i in 1 .. p_array.count
loop
     l_p_arrayout.extend;
     insert into person_test values(p_array(i).person_id, 'in Record '||p_array(i).person_name);
     l_person_id := p_array(i).person_id;
     l_person_name := p_array(i).person_name;
     l_person := person_t(null,null);
     l_person.person_id := l_person_id + 5;
     l_person.person_name := 'Out Record ' ||l_person_name ;
     l_p_arrayout(i) := l_person;
end loop;
p_arrayout := l_p_arrayout;
     l_person_id := p_arrayout.count;
for i in 1 .. p_arrayout.count
loop
insert into person_test values(l_person_id, p_arrayout(i).person_name);
end loop;
commit;
EXCEPTION WHEN OTHERS THEN
     errm := SQLERRM;
     insert into person_test values(-1, errm);
     commit;
end;
vi) Now finally create your java class which will invoke the pl/sql procedure and get the updated value array and then display it on your screen>Alternatively you can also check the "person_test" tbale
import java.util.Date;
import java.io.*;
import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.driver.*;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class ArrayDemo
public static void passArray() throws SQLException
Connection conn = getConnection();
ArrayDemo a = new ArrayDemo();
Person pn1 = new Person();
pn1.person_id = 1;
pn1.person_name = "SunilKumar";
Person pn2 = new Person();
pn2.person_id = 2;
pn2.person_name = "Superb";
Person pn3 = new Person();
pn3.person_id = 31;
pn3.person_name = "Outstanding";
Person[] P_arr = {pn1, pn2, pn3};
Person[] P_arr_out = new Person[3];
ArrayDescriptor descriptor =
ArrayDescriptor.createDescriptor( "PERSON_TAB", conn );
ARRAY array_to_pass =
new ARRAY( descriptor, conn, P_arr);
OracleCallableStatement ps =
(OracleCallableStatement )conn.prepareCall
( "begin give_me_an_array(?,?); end;" );
ps.setARRAY( 1, array_to_pass );
     ps.registerOutParameter( 2, OracleTypes.ARRAY,"PERSON_TAB" );
     ps.execute();
     oracle.sql.ARRAY returnArray = (oracle.sql.ARRAY)ps.getArray(2);
Object[] personDetails = (Object[]) returnArray.getArray();
Person person_record = new Person();
for (int i = 0; i < personDetails.length; i++) {
          person_record = (Person)personDetails;
          System.out.println( "row " + i + " = '" + person_record.person_name +"'" );
                    public static void main (String args[]){
     try
                         ArrayDemo tfc = new ArrayDemo();
                         tfc.passArray();
     catch(Exception e) {
                    e.printStackTrace();
          public static Connection getConnection() {
     try
                         Class.forName ("oracle.jdbc.OracleDriver");
                         return DriverManager.getConnection("jdbc:oracle:thin:@<<HostNanem>>:1523:VIS",
                         "username", "password");
     catch(Exception SQLe) {
                    System.out.println("IN EXCEPTION BLOCK ");
                    return null;
and thats it. you are done.
Hope it atleast helps people to get started. Comments are appreciated. I can be reached at ([email protected]) or [email protected]
Thanks
Sunil.s

Hi Sunil,
I've a similar situation where I'm trying to insert Java objects in db using bulk insert. My issue is with performance for which I've created a new thread.
http://forum.java.sun.com/thread.jspa?threadID=5270260&tstart=30
I ran into your code and looked into it. You've used the Person object array and directly passing it to the oracle.sql.ARRAY constructor. Just curios if this works, cos my understanding is that you need to create a oracle.sql.STRUCT out of ur java object collection and pass it to the ARRAY constructor. I tried ur way but got this runtime exception.
java.sql.SQLException: Fail to convert to internal representation: JavaBulkInsertNew$Option@10bbf9e
                    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
                    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
                    at oracle.jdbc.oracore.OracleTypeADT.toDatum(OracleTypeADT.java:239)
                    at oracle.jdbc.oracore.OracleTypeADT.toDatumArray(OracleTypeADT.java:274)
                    at oracle.jdbc.oracore.OracleTypeUPT.toDatumArray(OracleTypeUPT.java:115)
                    at oracle.sql.ArrayDescriptor.toOracleArray(ArrayDescriptor.java:1314)
                    at oracle.sql.ARRAY.<init>(ARRAY.java:152)
                    at JavaBulkInsertNew.main(JavaBulkInsertNew.java:76)
Here's a code snippet I used :
Object optionVal[] =   {optionArr[0]};   // optionArr[0] is an Option object which has three properties
oracle.sql.ArrayDescriptor empArrayDescriptor = oracle.sql.ArrayDescriptor.createDescriptor("TT_EMP_TEST",conn);
ARRAY empArray = new ARRAY(empArrayDescriptor,conn,optionVal);If you visit my thread, u'll see that I'm using STRUCT and then pass it to the ARRAY constructor, which works well, except for the performance issue.
I'll appreciate if you can provide some information.
Regards,
Shamik

Best way to perform the same task wih arrays of different Objects

Hello all.
This isn't an XPath question, it's a much lower-level Java Object question, but it involves XPath. I hope that doesn't distract from the question, or confuse anything.
I have 4-5 different types of Objects (call them A, B, C, etc.) that each contain an array of other Objects (call them a[], b[], c[], etc.)
a, b, c, etc., each have an Xpath object and and XPathExpression. When I create each XPath object I assign it a NamespaceContext object which contains the namespaces needed for that XPath.
When I create, for example, an A object, I pass is constructor an array of a and an array of Namespaces. With each a object I need to:
1. create a NamespaceContext object
2. go through all the Namespace objects and if its route matches,
(if Namespace.route == a.getRoute() )
3. add that Namespace to the NamespaceContext Object,
4. assign the NamespaceContext to the XPath object, and finally
5. create the a object, passing it the XPath object
My problem / question is: I also have to do the same thing with B and b[], C and c[], etc. It's not that long of a process, not that much code, but all the same, I was wondering what the best way to write this code once would be, and have it work for all the different types of Objects.
In other words, I'd like to write a mehod, call it assignNamespaces(), that accepts an array of Objects(a[], b[], c[], etc.) and an array of Namespaces, creates the XPath Object for each a, b, c, etc., and that creates and returns an array of a[],b[],c[], etc., sending the XPath Object as a parameter.
That way when I create for example an A Object, I call:
class A
ObjectsWithXpath[] objectsWithXPath;
this..objectsWithXPath = assignNamespaces(objectsWithXPath,namespaces);
Should the assgnNamespaces() method simply use Class.forName() to see what type of Object it is and do a cast accordingly, or is there some other, more elegant way of doing this?
I hope I've explained myself, and haven't bored you ...
Thanks in advance,
Bob

Thanks for your reply!
I poked around a bit looking into Factory classes. I've used them a million times but never actually made one. At any rate, they seem like a good idea when you have a bunch of different classes that are similar but not equal.
In my case my classes ONLY have the XPathExpression in common. Which means that I'd have to make a base abstract class with a bunch of methods of which only a percentage are defined by any class that extends it. In other words, if I had 3 classes -- a, b and c -- that extend the base abstract class, and each had 5 getters and setters, the base abstract class would have 15 methods, 5 only used by a, 5 only used by b and 5 only used by c.
It seemed a bit ugly to me. Besides, I only have 3 classes. I decided to factor out the inner loop, which is about 70% of the code, stick it in a utility class, and call it from there. I am repeating some code still, but it isn't that bad, and it saves me having to define an interface, an abstract class, a Factory class, etc.
It ain't perfect, but then nothing ever is.
Thanks for all the help! Viva the Java community!
Bob

Array of an Object

I hope this is the right place to post this but here goes. I am trying to create an array of an object which I have created to store basic details of various people, I have declared the array like this people[] Person = new people[5]; //people is the name of the object but whenever i try to assign values to one of objects, for example Person[number].setName(textName.getText()); //number is predetermined array value to use it throws a null pointer exception. If I define a single instance such as people Person = new people(); it works fine but I specifically need and array. Any help would be greatly appreciated.

I have to say thanks again, it is working now, all that's left is to change is the naming conventions <img class="emoticon" src="images/emoticons/happy.gif" border="0" alt="" />.

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!

Array of cfc object help

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