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Thread: Timer inside loop

  1. #1
    Junior Member
    Join Date
    Apr 2012
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    Default Timer inside loop

    Hello. On button click, I have some loop and inside it I want to append jTextArea with some data. I want to do it for example every 3 seconds. For example:
    answer1 printed 11:13:10
    answer1 printed 11:13:13
    answer3 printed 11:13:16
    answer4 printed 11:13:19

    and so on.

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            if (kiek > 0 && jTextArea1.getLineCount() > 0) {
                String str;
                BufferedReader reader = new BufferedReader(
                        new StringReader(jTextArea1.getText()));
                double prog = 0;
                try {
                    while ((str = reader.readLine()) != null) {
                        if (str.length() > 0) {
                            jTextArea2.append("Working with IP " + str + "\n");
                            for (int j = 0; j < a.size(); j++) {
                                jTextArea2.append(a.get(j) + "\n");
                        prog += (double) 100 / (double) jTextArea1.getLineCount();
                        jProgressBar1.setValue((int) (prog));
                } catch (IOException ex) {

    I get each line of other TextArea, print it to current, and also add some information from ArrayList a jTextArea2.append(a.get(j) + "\n");

    All I want is that every output to textarea would be periodical for example for 3 seconds.
    I tried to do it with Thread.pause(); but in that way, it is waiting for all function to end, and then outputs all data in one time.

  2. #2
    Administrator copeg's Avatar
    Join Date
    Oct 2009
    Thanked 832 Times in 772 Posts
    Blog Entries

    Default Re: Timer inside loop

    Swing is single threaded, bog down that single thread with sleep or pause and you bog down that thread and lock up the gui. Use a swing timer, which seems more appropriately suited for your needs

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