CODEWITHSUNDEEP
javaswing
danrodi
danrodi

Reputation: 296

Adding an object to the list after deleting another object in Java

I have this piece of code, which creates a list:

rightPanel.add(Box.createRigidArea(new Dimension(20, 20)));
final DefaultListModel model = new DefaultListModel();
for(int i=0;i<nameData.length;i++){
    if(nameData[i]==null) break;
        model.addElement(nameData[i]);
    }
final JList list = new JList();
list.setModel(model);
JScrollPane listScroller = new JScrollPane(list);
listScroller.setPreferredSize(new Dimension(250, 80));
listScroller.setAlignmentX(LEFT_ALIGNMENT);
rightPanel.add(listScroller);

When I select the object from that list, I have a button which it makes it possible to delete the selected object:

rightPanel.add(Box.createRigidArea(new Dimension(20, 20)));
final JButton deleteConfirmButton = new JButton("Kustuta");
deleteConfirmButton.setEnabled(false);
rightPanel.add(deleteConfirmButton);
deleteConfirmButton.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e)
    {
        model.removeElementAt(listIndex);
        nameData[listIndex] = null;
        deleteConfirmButton.setEnabled(false);
    }
});

But after deleting the object, when I'm trying to add a new object to the same array that the list is made of, it won't show the changes in the list anymore.

Upvotes: 1

Views: 99

Answers (1)

dic19
dic19

Reputation: 17971

Here:

//Adds the data from the textfield to corresponding string.
String name = nameTextField.getText();
String eMail = eMailTextField.getText();
String dateOfBirth = dateOfBirthTextField.getText();
String address = addressTextField.getText();

//Stores the string data in an array.
nameData[n] = name;
eMailData[n] = eMail;
dateOfBirthData[n] = dateOfBirth;
addressData[n] = address;

Why do you have plenty of arrays such as nameData[], emailData[] etc ? Don't be better create a class to hold this info instead? For instance:

class Data {

    String name;
    String email;
    Date dateOfBirth;
    String address;

    public Data(String name, String email, Date dateOfBirth, String address){ ... }

    // getters and setters here
}

Then in your list model you can add Data objects like this:

String name = nameTextField.getText();
String eMail = eMailTextField.getText();
String dateOfBirth = dateOfBirthTextField.getText();
String address = addressTextField.getText();

DefaultListModel model = (DefaultListModel)list.getModel();
model.add(new Data(name, eMail, dateOfBirth, address));

Please take a carefully read to How to Use Lists tutorial. It's your friend.

Upvotes: 2

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