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Java Swing - 如何從JTextPane獲取DefaultCaret

我們想知道如何從JTextPane獲取DefaultCaret。 
import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.DefaultCaret;

public class Main extends JFrame {
  JPanel panel = new JPanel();
  public static void main(String[] args) {
    Main frame = new Main();
    frame.setVisible(true);
  }

  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    panel.setLayout(new BorderLayout());
    setContentPane(panel);
    JTextPane textA = new JTextPane();
    textA.setName("text");
    textA.setContentType("text/html");
    DefaultCaret caret = (DefaultCaret) textA.getCaret();
    caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
    JScrollPane filler = new JScrollPane(textA,
        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
        JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

    JTextPane textB = new JTextPane();
    textB.setName("text" + "_T");
    textB.setFont(textA.getFont());
    DefaultCaret caret_T = (DefaultCaret) textB.getCaret();
    caret_T.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
    JScrollPane filler_T = new JScrollPane(textB,
        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
        JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    panel.add(filler, BorderLayout.NORTH);
    panel.add(filler_T, BorderLayout.CENTER);
    pack();
  }
}