java - efficient adding

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this is my code

C#

int i = 0;
    while(i < 1000000)
    {
        list.addItem("v", i);
        i = i + 1;
    }

this works fine but, is very inefficient because the program stops responding while adding a large amount, I was wondering if there is better code then this? I want it to add the numbers into the listbox or combobox with-out this lagging, is this possible?

Posted 12-Aug-13 21:45pm

C.CoderCreator

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max_nowak 13-Aug-13 3:58am

If you intend to add 1000000 items to your control on your gui, then I think there's no way around of dealing with some lag. Anyway, why would you even want to do that? What's your use case?

[no name] 13-Aug-13 4:08am

I intent on making a program which generates seeds for mincraft, and allow the user get a huge amount to choose from, I want it to be a very unique, seed generator and nor like the rest.

max_nowak 13-Aug-13 4:17am

You could still split up the work of filling the list in multiple threads. Say, one thread handles the first 500000 and at the same time the second thread starts from 500000 and runs till 1000000

Richard MacCutchan 13-Aug-13 5:54am

That's like using a steamhammer to crack a nut, and all you are getting is the sequenc 1 to 1000000. Use the Random() method to generate more truly random numbers.

[no name] 13-Aug-13 5:55am

I did that, just didn't show it

Richard MacCutchan 13-Aug-13 5:59am

Sorry, what do you mean?

[no name] 13-Aug-13 6:00am

sorry, read your comment wrong

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TorstenH. · Answer 1 · 2013-08-14T01:26:00

Solution 3

Different approach:

make up a textbox, limit the values and validate entered numbers.

Posted 14-Aug-13 1:26am

TorstenH.

Stephen Hewison · Answer 2 · 2013-08-13T00:14:00

My advice would be to create a number of cascade lists.

First list has:

0 - 99999
100000 - 199999
200000 - 299999
e.t.c.

Second list break down the next choice into a similar number of options.

0 - 9999
10000 - 19999
e.t.c.

And repeat until an exact number is selected.

That way you shouldn't have more than 100 list items over several lists.

Mehdi Gholam · Answer 3 · 2013-08-13T00:15:00

Solution 2

If you want to add content to a listbox or anything similar try using a StringBuilder instead of writing one at a time (bulk add your content), see here : http://docs.oracle.com/javase/tutorial/java/data/buffers.html[^]

Posted 13-Aug-13 0:15am

Mehdi Gholam