Friends, I need some inputs about my java program. My program is supposed to store 3 information into an ArrayList so-called arrayOne at each runtime:
1. Unique ID
2. Boolean Value
3. data.
Let's assume I give first input a = 5, compile & run: Result - arrayOne.
Second Input a = 24, compile & run: Result - arrayOne.
Aim: To compare these two result arrays after runtime.
How to extract the results & compare these 2 result arrays after runtime that can automatically check the data & boolean value?
please advise and I'll post my program then...
28 8867
Friends, I need some inputs about my java program. My program is supposed to store 3 information into an ArrayList so-called arrayOne at each runtime:
1. Unique ID
2. Boolean Value
3. data.
Let's assume I give first input a = 5, compile & run: Result - arrayOne.
Second Input a = 24, compile & run: Result - arrayOne.
Aim: To compare these two result arrays after runtime.
How to extract the results & compare these 2 result arrays after runtime that can automatically check the data & boolean value?
please advise and I'll post my program then...
If you want the results after the program has exited then you need to write the results to a file or database.
If you want the results after the program has exited then you need to write the results to a file or database.
Please give me some pointer on how to write result into a file ..
and compare them ...at least any web page for my reading..thanks a lot
Please give me some pointer on how to write result into a file ..
and compare them ...at least any web page for my reading..thanks a lot
Last week's tip of the week talked about writing to a textfile. In this case however you should write the Arraylist to the file as an object using serialization.
Last week's tip of the week talked about writing to a textfile. In this case however you should write the Arraylist to the file as an object using serialization.
Yes, I've gone through it and I do remember last time you taught me how to transfer/export result into a file using FileOutputStream.
Now I managed to get it done. Next, how am I supposed to do to compare the second result(new input) after second program has exited?
hope you can guide me please...
o ya I print result in a txt file...or maybe I need to print in other format in order for me to compare them automatically? idea please...thank you
Yes, I've gone through it and I do remember last time you taught me how to transfer/export result into a file using FileOutputStream.
Now I managed to get it done. Next, how am I supposed to do to compare the second result(new input) after second program has exited?
hope you can guide me please...
o ya I print result in a txt file...or maybe I need to print in other format in order for me to compare them automatically? idea please...thank you
If you wrote the ArrayList to the file as an object like you should have then you can retrieve it using the readObject method of ObjectInputStream and type cast it to the ArrayList.
If you wrote the ArrayList to the file as an object like you should have then you can retrieve it using the readObject method of ObjectInputStream and type cast it to the ArrayList.
From my understanding, what you mean is while the second program is still running retrieve the first output from text file using the readObject() from ObjectInputStream class and automatically compare them?
please correct me if I'm wrong...
From my understanding, what you mean is while the second program is still running retrieve the first output from text file using the readObject() from ObjectInputStream class and automatically compare them?
please correct me if I'm wrong...
I'm not too sure about the "automatically" part but that's the jists of it.
I'm not too sure about the "automatically" part but that's the jists of it.
Alright, thanks for your valuable idea. Please guide me how to retrieve the first executed program result...Do I need to call readObject() from the ArrayList place or create another new method - ObjectInputStream or from here: - public static void print(String s)
-
{
-
try
-
{
-
FileOutputStream fout;
-
fout = new FileOutputStream ("output.txt",true);
-
new PrintStream(fout).println (s);
-
fout.close();
-
}
-
-
catch (IOException ex)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
ex.printStackTrace();
-
}
-
}
Alright, thanks for your valuable idea. Please guide me how to retrieve the first executed program result...Do I need to call readObject() from the ArrayList place or create another new method - ObjectInputStream or from here: - public static void print(String s)
-
{
-
try
-
{
-
FileOutputStream fout;
-
fout = new FileOutputStream ("output.txt",true);
-
new PrintStream(fout).println (s);
-
fout.close();
-
}
-
-
catch (IOException ex)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
ex.printStackTrace();
-
}
-
}
What is that code suppposed to be doing?
You should write the ArrayList to the file using an ObjectOutputstream first in the first program, then you can retrieve it from the file in the second program
What is that code suppposed to be doing?
You should write the ArrayList to the file using an ObjectOutputstream first in the first program, then you can retrieve it from the file in the second program
In general the final result of my program is to collect/store 3 types of data:
1. Unique ID
2. Boolean Value
3. data.
I use ArrayList to store those information -
List listOne = new ArrayList();
-
....
-
//looping for collect required data
-
....
-
listOne.add(new Entry(ID, data, value));
-
print("ID: " +uniqueID);
-
print("Data: " +data);
-
print("value: " +value);
-
Now you mean I have to change the ArrayList to the file using an ObjectOutputstream? But how..please gimme some pointer...
In general the final result of my program is to collect/store 3 types of data:
1. Unique ID
2. Boolean Value
3. data.
I use ArrayList to store those information -
List listOne = new ArrayList();
-
....
-
//looping for collect required data
-
....
-
listOne.add(new Entry(ID, data, value));
-
print("ID: " +uniqueID);
-
print("Data: " +data);
-
print("value: " +value);
-
Now you mean I have to change the ArrayList to the file using an ObjectOutputstream? But how..please gimme some pointer...
You write the whole arraylist as one object to a file and then retrieve it later. You write it to a file using ObjectOutputStream. Look at the docs for this class and see how can use it to store the whole arraylist into a file.
You write the whole arraylist as one object to a file and then retrieve it later. You write it to a file using ObjectOutputStream. Look at the docs for this class and see how can use it to store the whole arraylist into a file.
Firstly, I've tried to write ArrayList as one object to a file, is that something like this? please check as I compile everything okay..but problem during runtime. -
try
-
{
-
// Create a stream for writing.
-
FileOutputStream fout = new FileOutputStream ("output.txt",true);
-
// Next, create an object that can write to that file.
-
ObjectOutputStream oOutStream = new ObjectOutputStream( fout );
-
-
// Save each object.
-
oOutStream.writeObject(listOne);
-
-
oOutStream.flush();
-
new PrintStream(fout).println (s);
-
fout.close();
-
-
}
Firstly, I've tried to write ArrayList as one object to a file, is that something like this? please check as I compile everything okay..but problem during runtime. -
try
-
{
-
// Create a stream for writing.
-
FileOutputStream fout = new FileOutputStream ("output.txt",true);
-
// Next, create an object that can write to that file.
-
ObjectOutputStream oOutStream = new ObjectOutputStream( fout );
-
-
// Save each object.
-
oOutStream.writeObject(listOne);
-
-
oOutStream.flush();
-
new PrintStream(fout).println (s);
-
fout.close();
-
-
}
Should be fine. I'm not sure what the line - new PrintStream(fout).println (s);
is doing there though
Should be fine. I'm not sure what the line - new PrintStream(fout).println (s);
is doing there though
Still the same if I comment the line ..it's okay. i'll figure it out...
How about to retrieve back the data...? Let say after I finish this phase which is in the first program run - write result into a file namely A.
Second time I run program with different input produce new result, I do comparison directly in here by retrieve file A? Do I have to write to a new file namely B first or how, any idea...? thank you
Hi,
If my understanding on your requirement is right, you want to have a program which will read the inputs (say the different data - id, boolean,data) and store them into an ArrayList. For every run [assume, as of now your requirement is only 2 times], the program should compare the individual values of the present run with that of the previously entered values.
In order to get the previously entered values, we should store the data somewhere so that we can fetch it later. Since the control/scope is lost once the program execution finishes, we can't store the data with any variables. The only way is to store it to any permanent storage medium so that you can get it back. Thats why the SERIALIZATION comes in - the easy way of managing things.
You can think Serialization as equal to store it into the database but with the different arena. {thats not our scope now, i assume you are comfortable with serialization by now}.
Now, the main part is, for every time you run, you first get the values from the user and populate your arraylist object with these values. Then fetch the previous values and compare the individual attributes/values.
What you can do is,
(a) Keep a counter variable which you append it to the end of the file.
You retrieve this value and increment it for the next file to be stored.But you should store the counter variable also in another file !!
(b) You can append the current datetime value with the filename while storing it. No matter how many files are present, you just keep writing a new file everytime. While retrieving, you just instantiate different arraylist objects as that of number of files in the directory. Then you can compare the values.
Hope this helps....
Hi,
If my understanding on your requirement is right, you want to have a program which will read the inputs (say the different data - id, boolean,data) and store them into an ArrayList. For every run [assume, as of now your requirement is only 2 times], the program should compare the individual values of the present run with that of the previously entered values.
In order to get the previously entered values, we should store the data somewhere so that we can fetch it later. Since the control/scope is lost once the program execution finishes, we can't store the data with any variables. The only way is to store it to any permanent storage medium so that you can get it back. Thats why the SERIALIZATION comes in - the easy way of managing things.
You can think Serialization as equal to store it into the database but with the different arena. {thats not our scope now, i assume you are comfortable with serialization by now}.
Now, the main part is, for every time you run, you first get the values from the user and populate your arraylist object with these values. Then fetch the previous values and compare the individual attributes/values.
What you can do is,
(a) Keep a counter variable which you append it to the end of the file.
You retrieve this value and increment it for the next file to be stored.But you should store the counter variable also in another file !!
(b) You can append the current datetime value with the filename while storing it. No matter how many files are present, you just keep writing a new file everytime. While retrieving, you just instantiate different arraylist objects as that of number of files in the directory. Then you can compare the values.
Hope this helps....
Thank you friend. Your understanding about my aim is absolutely RIGHT.
After reading your notes I now know what is SERIALIZATION for (at least).
I would say that I need to proper digest your advice on how to implement it in my program...
Just one thing I don't get here is counter variable. If I am not mistaken, can I say that counter variable here is same as ArrayList size (in my case is oneList.size())?
Or I do have to create/generate a new variable as counter?Here I have class Entry (id, boolean,data).....
Thanks again....I shall try it first and see how it goes..
Hi,
You are correct. The counter i meant to say was what you generate to keep track of the files.. So inorder to create the new value which is incremental of the previous value, you need the previous value. Thats why i told you should store the counter value also in a separate file.
Say, for the first time, you store the arraylist contents through Serialization in the file named "ArrayListContents-1.txt". The next iteration should store it in "ArrayListContents-2.txt". Right? For generating the 2, you need the previous value 1. Where would you take it? You should have stored it somewhere else and retrieve it now for incrementing it to be used this time.
Hope this clears..
Good luck.
Hi,
You are correct. The counter i meant to say was what you generate to keep track of the files.. So inorder to create the new value which is incremental of the previous value, you need the previous value. Thats why i told you should store the counter value also in a separate file.
Say, for the first time, you store the arraylist contents through Serialization in the file named "ArrayListContents-1.txt". The next iteration should store it in "ArrayListContents-2.txt". Right? For generating the 2, you need the previous value 1. Where would you take it? You should have stored it somewhere else and retrieve it now for incrementing it to be used this time.
Hope this clears..
Good luck.
Phew! I feel dizzy doing this assignment, really :)
Now, I experience what you meant..It's complicated in second execution.
First part is done fairly easy (after you guys helped me), now I have problem on how to retrieve the ArrayListContents-2.txt.
At first I tried to make a loop from the current Entry size and retrieve the first output but having CONFLICT with the first Entry size that also has same variable name. oh god sorry if I make you confuse....I don't how to explain...If possible please take a look at my codes below: -
listOne.add(new Entry(uniqueID, data, booleanValue));
-
try
-
{
-
FileOutputStream fout = new FileOutputStream (FILENAME, true);
-
ObjectOutputStream oos = new ObjectOutputStream( fout );
-
oos.writeObject(uniqueID);
-
oos.writeObject(data);
-
oos.writeObject(booleanValue);
-
-
oos.flush();
-
fout.close();
-
-
FileInputStream fis = new FileInputStream(FILENAME);
-
ObjectInputStream ois = new ObjectInputStream(fis);
-
Object obj = ois.readObject();
-
-
List<Entry> listFromFile = (ArrayList) obj;
-
for (Entry listOne: listFromFile)
-
{
-
try
-
{
-
FileInputStream fis1 = new FileInputStream("output1.txt"); //DO I HAVE TO CREATE NEW FIS FOR READING THE FIRST OUTPUT FILE?
-
ObjectInputStream ois1 = new ObjectInputStream(fis1);
-
Object obj1 = ois1.readObject();
-
-
for (int i = 0; i <listOne.size(); i++) //HERE IS THE CONFLICT!! - SAME ARRAYLIST NAME CREATED
-
{
-
Entry myEnt = (Entry)listOne.get(i);
-
-
if(myEnt.equalsId((Entry)listOne.get(i)))
-
{
-
if(myEnt.equalsData((Entry)listOne.get(i)))
-
{
-
if(myEnt.equals((Entry)listOne.get(i)))
-
{
-
System.out.println ("1");
-
-
}
-
else
-
{
-
System.out.println ("2");
-
}
-
}
-
else
-
{
-
System.out.println ("3");
-
-
}
-
}
-
}
-
}
-
-
catch (FileNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
catch (IOException e)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
e.printStackTrace();
-
}
-
catch (ClassNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
}
-
-
}
-
catch (FileNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
catch (IOException e)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
e.printStackTrace();
-
}
-
catch (ClassNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
-
}
Phew! I feel dizzy doing this assignment, really :)
Now, I experience what you meant..It's complicated in second execution.
First part is done fairly easy (after you guys helped me), now I have problem on how to retrieve the ArrayListContents-2.txt.
At first I tried to make a loop from the current Entry size and retrieve the first output but having CONFLICT with the first Entry size that also has same variable name. oh god sorry if I make you confuse....I don't how to explain...If possible please take a look at my codes below: -
listOne.add(new Entry(uniqueID, data, booleanValue));
-
try
-
{
-
FileOutputStream fout = new FileOutputStream (FILENAME, true);
-
ObjectOutputStream oos = new ObjectOutputStream( fout );
-
oos.writeObject(uniqueID);
-
oos.writeObject(data);
-
oos.writeObject(booleanValue);
-
-
oos.flush();
-
fout.close();
-
-
FileInputStream fis = new FileInputStream(FILENAME);
-
ObjectInputStream ois = new ObjectInputStream(fis);
-
Object obj = ois.readObject();
-
-
List<Entry> listFromFile = (ArrayList) obj;
-
for (Entry listOne: listFromFile)
-
{
-
try
-
{
-
FileInputStream fis1 = new FileInputStream("output1.txt"); //DO I HAVE TO CREATE NEW FIS FOR READING THE FIRST OUTPUT FILE?
-
ObjectInputStream ois1 = new ObjectInputStream(fis1);
-
Object obj1 = ois1.readObject();
-
-
for (int i = 0; i <listOne.size(); i++) //HERE IS THE CONFLICT!! - SAME ARRAYLIST NAME CREATED
-
{
-
Entry myEnt = (Entry)listOne.get(i);
-
-
if(myEnt.equalsId((Entry)listOne.get(i)))
-
{
-
if(myEnt.equalsData((Entry)listOne.get(i)))
-
{
-
if(myEnt.equals((Entry)listOne.get(i)))
-
{
-
System.out.println ("1");
-
-
}
-
else
-
{
-
System.out.println ("2");
-
}
-
}
-
else
-
{
-
System.out.println ("3");
-
-
}
-
}
-
}
-
}
-
-
catch (FileNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
catch (IOException e)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
e.printStackTrace();
-
}
-
catch (ClassNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
}
-
-
}
-
catch (FileNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
catch (IOException e)
-
{
-
System.out.println("There was a problem creating/writing to the temp file");
-
e.printStackTrace();
-
}
-
catch (ClassNotFoundException e)
-
{
-
e.printStackTrace();
-
}
-
-
}
You know you can just use one text file and one ArrayList of ArrayLists.
You always use that ArrayList to add new ArrayLists and so to the file you are working with only one ArrayList and it becomes easier to store and get.
Yes thats right.. you could use a single file and a collection of ArrayLists in case you need to go for more and repeated runs.
Yes thats right.. you could use a single file and a collection of ArrayLists in case you need to go for more and repeated runs.
But friends, how to do that..
Since the first execution will produce one ArrayList of Entry (MANY entries) with 3 attributes (for each entry) in a text file, then for the second execution, if I just use the same text file don't you think that it will replace the first output?
But then you're definitely right to just use a single file and collection of arraylists because I need to go for many loops in order to compare the attributes...but how?
Please guide me...........thanks a lot
But friends, how to do that..
Since the first execution will produce one ArrayList of Entry (MANY entries) with 3 attributes (for each entry) in a text file, then for the second execution, if I just use the same text file don't you think that it will replace the first output?
But then you're definitely right to just use a single file and collection of arraylists because I need to go for many loops in order to compare the attributes...but how?
Please guide me...........thanks a lot
Before you write again to the ArrayList you first retrieve the one previously written to the file. then you add the new ArrayList to that ArrayList and write back the ArrayList of ArrayLists.
Before you write again to the ArrayList you first retrieve the one previously written to the file. then you add the new ArrayList to that ArrayList and write back the ArrayList of ArrayLists.
I'm still working on it..by the way, friend of mine once said that I maybe need to change to FileReader/FileWriter in order to for me to save each attribute in a single line....and read the file line by line...
grr...clueless..
I'm still working on it..by the way, friend of mine once said that I maybe need to change to FileReader/FileWriter in order to for me to save each attribute in a single line....and read the file line by line...
grr...clueless..
No. don't write line by line. You'd have to break up the ArrayList into into it's contents first and regroup them again when you read them. Just write one arraylist object to the file using serialization and if you need to add another arraylist then just add it as an element of that arraylist.
No. don't write line by line. You'd have to break up the ArrayList into into it's contents first and regroup them again when you read them. Just write one arraylist object to the file using serialization and if you need to add another arraylist then just add it as an element of that arraylist.
Ok. The first execution output file written in per entry as one ArrayList variable - listOne.
Then for second time I don't know how to read them..what's the code to readObject:
this is my codes but I think it's wrong... -
List<Entry> listOne = new ArrayList<Entry>();
-
....
-
try
-
{
-
/* RETRIEVE THE ONE PREVIOUSLY WRITTEN TO THE FILE */
-
FileInputStream fis = new FileInputStream(FILENAME);
-
ObjectInputStream ois = new ObjectInputStream(fis);
-
-
Object position = (listOne)ois.readObject(); //HERE- HOW TO RETRIEVE THEM AS THERE ARE 3 ATTRIBUTES THAT I HAVE TO COMPARE
-
Object number = (listOne)ois.readObject();
-
value = ....
-
Ok. The first execution output file written in per entry as one ArrayList variable - listOne.
Then for second time I don't know how to read them..what's the code to readObject:
this is my codes but I think it's wrong... -
List<Entry> listOne = new ArrayList<Entry>();
-
....
-
try
-
{
-
/* RETRIEVE THE ONE PREVIOUSLY WRITTEN TO THE FILE */
-
FileInputStream fis = new FileInputStream(FILENAME);
-
ObjectInputStream ois = new ObjectInputStream(fis);
-
-
Object position = (listOne)ois.readObject(); //HERE- HOW TO RETRIEVE THEM AS THERE ARE 3 ATTRIBUTES THAT I HAVE TO COMPARE
-
Object number = (listOne)ois.readObject();
-
value = ....
-
Where is the ArrayList of ArrayLists?
You are supposed to have something like - ArrayList lists = new ArrayList();
-
-
ArrayList listOne = new ArrayList();
-
//add stuff to listOne
-
lists.add(listOne);
-
-
then write lists to the file and save it there.
In program 2 get lists (using readObject) from the file.
get listOne using
listOne = lists.get(0);
If you want to save another arraylist in program 2 then simply to
lists.add(listTwo);
And you now have two arraylists inside lists. You can then overwrite the previous lists with this new one e.t.c
Where is the ArrayList of ArrayLists?
You are supposed to have something like - ArrayList lists = new ArrayList();
-
-
ArrayList listOne = new ArrayList();
-
//add stuff to listOne
-
lists.add(listOne);
-
-
then write lists to the file and save it there.
In program 2 get lists (using readObject) from the file.
get listOne using
listOne = lists.get(0);
If you want to save another arraylist in program 2 then simply to
lists.add(listTwo);
And you now have two arraylists inside lists. You can then overwrite the previous lists with this new one e.t.c
I don't have ArrayList of ArrayLists (I think).. I only have - List<Entry>listOne = new ArrayList<Entry>();
Because of I have class Entry which I think is the same as what you mentioned ArrayList in here. I don't know. maybe you can have a look at the Entry Class as below: - class Entry
-
{
-
public Object IdNumber;
-
public Object data;
-
public boolean value;
-
-
public Entry(Object IdNumber, Object data, boolean value)
-
{
-
this.IdNumber = IdNumber;
-
this.data = data;
-
this.value = value;
-
}
-
-
public boolean equals(Entry e)
-
{
-
return value != e.value;
-
}
-
}
So I just add stuff to listOne such this: - listOne.add(new Entry( IdNumber, data, value));
Then, that's why I write these 3 attributes in a text file like this: -
oos.writeObject ( IdNumber); //CAN I WRITE EACH OBJECT ONE BY ONE TO TEXT FILE? THEN LATER I GONNA HAVE PROBLEM HOW/WHAT IS THE CODE TO RETRIEVE THEM.
-
oos.writeObject(data); //save each object
-
oos.writeObject(value);
-
oos.flush();
-
fout.close();
So still do I need to create an ArrayList to replace the Entry? I understand what you meant here, because later I have to retrieve them one ArrayList per ArrayList. In my case, can it be as Entry per entry?
Please teach me how/what is the code...thanks a lot.
does anyone care to share some ideas with me about ArrayLists? Really appreciate any help. Thank You.
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The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM).
In this month's session, we are pleased to welcome back...
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by: Vimpel783 |
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Hello!
Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
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by: ArrayDB |
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The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
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by: CloudSolutions |
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Introduction:
For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
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by: Defcon1945 |
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I'm trying to learn Python using Pycharm but import shutil doesn't work
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by: Shællîpôpï 09 |
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If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....
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by: Faith0G |
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I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
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by: isladogs |
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The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome former...
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