Java學習筆記之JTextArea自動滾動到最後一行

實現文本區文本自動顯示到最後一行:JTextArea jta = new JTextArea(5,10);jta .selectAll();jta .setCaretPosition(textPane.getSelectedText().length());jta .requestFocus(); 下面是一個參考樣本:import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Demo extends JFrame { JTextPane textPane = new JTextPane(); JTextArea ja = new JTextArea(); public Demo() {  super("JTextPane Demo");  getContentPane().setLayout(new BorderLayout());  final JButton buttonHome = new JButton("Go to Home");  final JButton buttonEnd = new JButton("Go to End");  ActionListener positionHandler = new ActionListener() {   public void actionPerformed(ActionEvent e) {    if (e.getSource() == buttonHome) {     textPane.setCaretPosition(0);     textPane.requestFocus();    } else if (e.getSource() == buttonEnd) {     textPane.selectAll();     textPane.setCaretPosition(textPane.getSelectedText()       .length());     textPane.requestFocus();    }   }  };  buttonHome.addActionListener(positionHandler);  buttonEnd.addActionListener(positionHandler);  JPanel paneNorth = new JPanel();  JPanel paneSouth = new JPanel();  paneSouth.add(buttonHome);  paneSouth.add(buttonEnd);  getContentPane().add(paneSouth, BorderLayout.SOUTH);  paneNorth.setLayout(new BorderLayout());  paneNorth.add(new JScrollPane(textPane), BorderLayout.CENTER);  getContentPane().add(paneNorth, BorderLayout.CENTER);  setSize(300, 400);  show(); } public static void main(String[] args) {  Demo app = new Demo();  app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }}