Java Swing - 如何添加自動(dòng)滾動(dòng)，當(dāng)文本添加到我的JScrollPane/JTextArea

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import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main extends JFrame {
  JTextArea txtMain;
  Main() {
    setSize(500, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(new BorderLayout());
    JScrollPane pane = new JScrollPane();
    txtMain = new JTextArea();
    pane.setViewportView(txtMain);
    this.add(pane, BorderLayout.CENTER);
    JButton btnAddText = new JButton("Add Text");
    btnAddText
        .addActionListener(e -> {
          txtMain.setText(txtMain.getText()
              + "\nLorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi sagittis id nibh vel rhoncus. ");
          String text = txtMain.getText();
          txtMain.setCaretPosition(text != null ? text.length() : 0);
        });
    add(btnAddText, BorderLayout.SOUTH);
    setVisible(true);
  }
  public static void main(String[] args) {
 
 
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