[news.eclipse.newcomer] Re: Getting scroll pane to display bottom of tex

[JACK YAO <yaofahua@xxxxxxxxxxx>]

Peter Toye:
This is another test program. I started a new thread to append 100 
strings. When I commented the two lines , it always displayed the first 
    several lines, and when not, it displayed the last several lines. I 
think that maybe the two concurrent threads make the problem, each one 
only does half of the "right display" task. But because they are done 
separately in different threads, they can't work one by one.
Did you start a new thread to append or still have some other causes?
********************************************************
public class test extends JFrame implements ActionListener {
    JTextArea ta = new JTextArea(10, 10);
    int i = 0;
    JPanel p = new JPanel();
    JScrollPane sp = new JScrollPane(ta);
    public test() {
        p.add(sp);
        JButton btn = new JButton("test");
        btn.addActionListener(this);
        p.add(btn, BorderLayout.NORTH);
        this.add(p);
        pack();
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        new AddThread().start();
    }
    class AddThread extends Thread {
        public void run() {
            for (int i = 0; i < 100; i++) {
                ta.append("line :" + i + "\n");
                //JScrollBar sb = sp.getVerticalScrollBar();
                //sb.setValue(sb.getMaximum());
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    public static void main(String[] args) {
        new test();
    }
}
************************************************************

--
JACK YAO, Beijing, China