loading times excessive strengthening JList large

I have a request [url http://r0k.us/graphics/SIHwheel.html] using a JList. The size is variable and can be recharged with a different list of things. So far, the size of the list max has been about 1600 and (re) boots were quick, a matter of a few seconds for the 1600-element of the list.

Now, I would like to work with the largest lists, one with more 4,000 items and one with more 60 000. The 4 000 element we load in 20 seconds approximately (more than double the list 1 600 - element). The 60 000 elements takes several hours - so much I did not right it ends. The problem is, the more items there, more it takes to add a new item.

Here is a simplified version of the reset from the list. Note that the 'model' is the data represented by the list.

class simpler
{
    final DefaultListModel model = new DefaultListModel();
    private JList               list;
// following line in GUI initialization
//        list = new JList(model);

    private void getSortedNames(int sortCmd)
    {
        int howbig = 50000;
        ColorName worker;
        String hexName[];

        // clear-out old elements
        list.clearSelection();
        model.removeAllElements();  // without this line, even small lists take long time
        model.ensureCapacity(howbig);  // just added hoping it would help.  It doesn't.

        for (int i = 0; i < howbig; i++)
        {
if ((i % 16) == 1) System.out.print(i + " ");
            hexName = new String[2];
//            worker = ColorName.findColorName(i);
//            hexName[0] = worker.getHex();
//            hexName[1] = worker.getName();
hexName[0] = Integer.toString(i);
hexName[1] = Integer.toString(i + 1);
            model.addElement(hexName);
        }
    }
}

In the loop lines that start on the first column is debugging stuff. I wasn't sure if the slowdown was due to findColorName() or addElement(), so I got out of the game findColorName(). No effect on the speed, so I'm sure it's in Voodoo addElement() where lies the problem of gradual slowdown.

If I do not create a new hexName] each iteration, the process is extremely fast. Of course, creating 50,000 items of list of the same instance of the same data.

After studying [url http://docs.oracle.com/javase/1.4.2/docs/api/javax/swing/DefaultListModel.html] class DefaultListModel, I tried to replace model.addElements (hexName) with two model.set (i, hexName) and model.setElementAt (hexName, i). Both have led to errors of execution, with the crash of Jlist. (In some cases the rest of the program would continue.) I don't know what is the difference between the set() and setElementAt(), but none worked. I was hoping with all JList prealloue advance, it would be quicker set by index rather than add at the end. Maybe it would be if the operation could end without crashing.

Does anyone have an idea how to speed this up?

I tried to respond point by point to your previous answer but came to the conclusion that I really don't understand what you're trying to do. I'm reeling when talking about resolution 60 000 colors so I can't continue with this argument. I know that by using a list of length approximately 60,000 goes against all my experience of GUI, and everything I've read about the usefulness of GUI. I try to limit areas not drop more than 15 Articles and lists to no more than 60 Articles and would never ever consider never again 1,000 items so much 60 000!

For JComboBox and JTables and JLists should rarely add an element at a time especially if the length is important. For each item added to that an event is sent to all the listeners. If you add 60 000 items, you get 60 000 events but is only really needed! Think in terms of wrapper classes that implement the desired models. Think about having several converters that render an entry given in the model in various ways. Think of sort without actually create copies or sort the real objects; indirect kind is very very powerful. Think about other models packing and respond to events sent by these packaged models.

For a customer, I read at the start of a database in an event focused on the list of tuples. I have several TableModels used to display different views of the data that everyone reacts to events generated by the original list. When the original list is updated by the user all other models receive events that show the change and update any necessary prior to notifying the graphical interface it needs to update the display. Each JTable has a set of specific converters. Other rendering engine, I never copy the data or create versions of string data to display.

Tags: Java

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