JList retrieving data from a jlist

Question

How can I get the 3 individual strings from the JList? If I use model.elementAt I get the strings, but they are not separated from each other.

• How is the data stored in the JList?
• Can i perhaps get the data separated from each other by using an array?
• Is the data stored in a array?

while(resultaat.next()){
    model.addElement(resultaat.getString(1) + "  "
        + resultaat.getString(2) + "  "
        + resultaat.getString(3));
}

I use that line of code to add a bunch of strings to a JList model. The strings are from a mysql database.

Answer 1

Create some kind of container object that can represent the values you want, that is capable of displaying the values in the format that you want...

public class ListObject {
    private String[] values;
    public ListObject(String... values) {
        this.values = values;
    }

    public int size() {
        return values == null ? 0 : values.length;
    }

    public String get(int index) {
        return values == null ? null : values[index];
    }

    public String toString() {
        StringBuilder sb = new StringBuilder(64);
        if (values != null) {
            for (String value : values) {
                if (sb.length() > 0) {
                    sb.append(" ");
                }
                sb.append(value);
            }
        }
        return sb.toString();
    }
}

Add the wrapper object to the model...

while(resultaat.next()){
    model.addElement(new ListObject(resultaat.getString(1),
        resultaat.getString(2),
        resultaat.getString(3)));
}

And when you need to, retrieve the values...

String value = model.getElementAt(index).get(0);

For example

Answer 2

How is the data stored in the JList? - they are stored actualy in Model of jList so you must call jList.getModel().getElementAt() insteed of call only jList().getElement()

Can i perhaps get the data separated from each other by using an array? yes look at my example

Is the data stored in a array? No they are in model of jList

try this code to get your jlist model into array of object

// create array with Model size
Object[] arrayOfElements = new Object[yourjList.getModel().getSize()];

// easy loop for adding elements from jList to array
 for(int i = 0; i< yourjList.getModel().getSize(); i++){

                            arrayOfElements[i] = yourjList.getModel().getElementAt(i);
            }