How to calculate the time to render a JTable?

Question

Hi all,
I have a table that is taking quite some time to render after I edit one of its cells.
I'd like to know the complete amount of time it takes to render all the cells.
Considering the cells are rendered inside the java classes, I have no clue how can I do that.
Any help would be appreciated.

Answer 1

878279 wrote:
Tried VisualVM and it's really a nice tool. The problem is that it shows only the time for each method to run.Exactly, so if you look at the event queue thread and drill down you can see which method is 'taking quite some time' after you did an edit. Note that you typically need to drill down a bit into the Swing painting stack but ultimate it's end up in the methods you wrote.
See for example: http://imageshack.us/photo/my-images/827/simplecpusampling.png/ when sampling this program:
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class TestCPUSampling {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                DefaultTableModel slowModel = new DefaultTableModel(5, 5) {
                    @Override
                    public Object getValueAt(int row, int column) {
                        try {
                            Thread.sleep(10);
                        catch (InterruptedException e) {
                            e.printStackTrace();
                        return super.getValueAt(row, column);
                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.getContentPane().add(new JTable(slowModel));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
}Obviously Oracle should do something about that horribly slow Thread#sleep() method...
But if your getValueAt() is called 15 million times, then it's more likely you have a loop like a TableModelListener which modifies the table model when the table model changes.