Question

I have created a JDialog in NetBeans and a custom constructor as follows:

public AnimatedProgress(java.awt.Frame parent, boolean modal, JTable table) {
    super(parent, modal);
    initComponents();
    setLocationRelativeTo(parent);
    progressLabel.setText("Collecting Table Data. . .");
    Object[][] data = getJTableData(table); // Simple method to collect data and store in Object[][] array
    progressLabel.setText("Processing Data. . .");
    processData(data);
    progressLabel.setText("Data Processed. . .");
}

Now I called this JDialog as:

new AnimatedProgress(this, true, dataTable).setVisible(True);

My problem is, as Java calls the constructor, all the codes in constructor gets executed first and then the dialog appears with final result.

How can I make my JDialog appears first and then process the methods: getTableData() and processData()??

Answer 1

Here is a sample use of SwingWorker:

public class BackgroundThread extends SwingWorker<Void, Void>
{
    private JTable table;

    public BackgroundThread(JTable table)
    {
        this.table = table;
    }

    @Override
    public Void doInBackground() throws Exception
    {
        /*
            If getJTableData() or processData() are not static,
            pass a reference of your class which has these methods
            and call them via that reference
        */
        Object[][] data = getJTableData(table);
        publish("Processing Data. . .");
        processData(data);
        publish("Data Processed. . .");
        return null;
    }

    @Override
    public void process(List<String> chunks)
    {
        for(String chunk : chunks) progressLabel.setText(chunk);
    }
}

Then change you constructor to this:

public AnimatedProgress(java.awt.Frame parent, boolean modal, JTable table)
{
    super(parent, modal);
    initComponents();
    setLocationRelativeTo(parent);
    setVisible(true);
    new BackgroundThread(table).execute();
}

I didn’t test it, but I hope it works.