问JScrollPane滚动到最后添加的行

EN

import java.awt.TextArea;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;


public class Sample {

    public static void main(String[] args) {

        /*
         * Not on EDT
         */
        showAndFillTextArea("Not on EDT", 0, 0);

        /*
         * On EDT
         */
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                showAndFillTextArea("On EDT", 400, 0);
            }
        });
    }

    private static void showAndFillTextArea(String title, int x, int y) {

        JFrame frame = new JFrame(title);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextArea textArea = new JTextArea(20, 20);
        JScrollPane scrollPane = new JScrollPane(textArea);
        frame.getContentPane().add(scrollPane);
        frame.pack();
        frame.setLocation(x, y);
        frame.setVisible(true);
        for(int i = 0; i < 50; i++) {
            textArea.append("Line" + i + "\n");
        }
    }

}