Convert List containing objecs to multidimensional Array

Question

I have a ArrayList of objects. Suppose, the object is a class something like this...

public class User {

     String userId;
     String name;
     String account_created;
     String date_Of_Birth;

     //setters and getters
  }

Iam inserting the data into the list from an external source (like database)

List<User> usersList = new UserManager().totalUsersList();

I created a new Array for columns

String[] columns = new String[] { "Id", "Name", "Account Created", "Date of Birth" };

Iam want to send the List data into multidimensional array. Something like ...

String[][] usersData = new String[usersList.size()][4];

for (User user : usersList) {
    //usersData = usersData + {"","","",""} ; --> Need to add data into Array while iterating the over the list
}

How can i send data from List into the array : usersData

Iam sending the data into an array for displaying in a JTable(Swing).

Any Suggestions ...... ???

Community · Accepted Answer · 2017-05-23 11:43:34Z

2

Any Suggestions ...... ???

Don't. Maintain the structure of the data and create a custom TableModel (extending from something like AbstractTableModel) and use the List<User> as the data buffer

See How to Use Tables for more details and this for example

edited May 23, 2017 at 11:43

CommunityBot

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answered Apr 24, 2015 at 7:04

MadProgrammer

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Comments

Eran · Accepted Answer · 2015-04-24 07:05:12Z

1

You need a traditional for loop in order to use the indices :

for (int i=0; i<usersList.size(); i++) {
    User userTO = usersList.get(i);
    usersData[i] = new String[] {usetTO.getUserID(),...,...,...};
}

answered Apr 24, 2015 at 7:05

Eran

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