如何使JTextArea移动滚动条

Question

I am working with Java Swing and I have put a JTextArea in a JScrollBar. What I want is the scrollbar to follow the data. For a example i want to write in the JTextArea the output of a for(;;) so i can see the latest (newest) values. How could I do that?

EDIT: I have edited the question to be more specific.

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class AutoScrollTextArea {

    static String text = "Lorem ipsum dolor sit amet, "
        +"consectetur adipiscing elit. "
        +"Integer vestibulum metus id elit malesuada mattis. "
        +"Aliquam non rutrum justo. Morbi eleifend nisi ut "
        +"turpis commodo nec ultricies arcu vehicula. "
        +"Donec varius neque at nunc pellentesque tincidunt. "
        +"Phasellus sed ante ut tortor fermentum posuere sed "
        +"sit amet tortor. Sed cursus magna a lacus mattis eleifend. "
        +"Aliquam congue faucibus purus vel commodo. "
        +"Fusce rutrum consectetur nibh nec facilisis. ";

    public static void main(String[] args) {

        Runnable r = new Runnable() {
            public void run() {
                JPanel gui = new JPanel(new BorderLayout(5,5));
                final JTextArea textArea = new JTextArea(10,60);
                textArea.setWrapStyleWord(true);
                textArea.setLineWrap(true);
                textArea.setEnabled(false);
                gui.add(new JScrollPane(textArea), BorderLayout.CENTER);

                JButton button = new JButton("Add Text");
                button.addActionListener( new ActionListener(){
                    public void actionPerformed(ActionEvent ae) {
                        textArea.append(text);
                        textArea.append(System.getProperty("line.separator"));
                        textArea.append(System.getProperty("line.separator"));
                    }
                } );
                gui.add(button, BorderLayout.SOUTH);

                JOptionPane.showMessageDialog(null, gui);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

( It happens automatically ;)

Answer 2

IF you are using JTextArea in JScrollPane then following should work:

JTextArea area = new JTextArea();
area.setWrapStyleWord(true);
area.setLineWrap(true);
JScrollPane pane = new JScrollPane(area);

Answer 3

文本区域滚动