Java- how do I increment a variable whenever a file selected in JList?

Question

What I'm having problems with is that I have a list of 10 files in a JList. On a JButton, I have "attached file(s) 0." What I'm trying to achieve is when a user clicks on a file in the JList, the variable fileCount (represents the '0') will increment. Here is the code:

@Override
public void mouseClicked(MouseEvent arg0) {
        int idx = list_fileListing.getSelectedIndex();
        String eFiles[] = ig.getListOfFiles();

       if(idx == list_fileListing.getSelectedIndex()){
    fileCount++;
    }
}

Basically, if a file is selected, increment fileCount. Any suggestions as to how to accomplish this?

score 2 · Accepted Answer · answered Apr 03 '12 at 23:40

2

The JButton class has a setText() method like many of the other Swing component classes. You can use this method to overwrite the text that is currently on the JButton.

ex:

if(idx == list_fileListing.getSelectedIndex())
{
    fileCount++;
    yourButtonName.setText("attached file(s) " + fileCount);
}

hope this helps.

answered Apr 03 '12 at 23:40

Hunter McMillen

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That worked, but now the new problem is only registering 1 file if you decide to click on a different file in the list. Currently from your answer, every time a file is clicked, the fileCount will increment regardless of how many files I click on. What I need is every time the selection change, the fileCount resets to 0, then recounts selected files. – Apr 04 '12 at 01:20
Ok, well what event fires when you select more than one file? Once you figure what event is firing, you can check to see how many items were selected and increment by that amount. – Hunter McMillen Apr 04 '12 at 01:25
There is no even firing that I know of. After creating my list and testing it, I could already select multiple files in my list using Shift/Ctrl + click. Still trying to search if there is something that can check if the selection changed, but no luck so far... – Apr 04 '12 at 01:31
1

Try using the `getSelectedIndices()` method from the JList class, it should return an array of all the selected indexes. http://docs.oracle.com/javase/7/docs/api/javax/swing/JList.html#getSelectedIndices() – Hunter McMillen Apr 04 '12 at 01:36
Found the solution. ListSeletionListener. Then used getSelectedValueList and put it into a List, then got the size of it and put it into fileCount. Now it automatically updates the count according to whats selected. Thanks for the help :) – Apr 04 '12 at 02:36

Java- how do I increment a variable whenever a file selected in JList?

1 Answers1