不给,我按你的方法做不行!这是帮助说明: changedUpdate public void changedUpdate(DocumentEvent e) Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY). This tracks the changed offset via the event. Specified by: changedUpdate in interface DocumentListener Parameters:e - the DocumentEvent
public class MyFrame extends JFrame implements Serializable,DocumentListener中,没有写changedUpdate(javax.swing.event.DocumentEvent),当然不成了,你实现了DocumentListener接口的呀,需要重写changeUpdate方法的,以及removeUpdate和insertUpdate方法。
changedUpdate
public void changedUpdate(DocumentEvent e)
Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY). This tracks the changed offset via the event.
Specified by: changedUpdate in interface DocumentListener
Parameters:e - the DocumentEvent
changedUpdate()
insertUpdate()
removeUpdate()
三个方法。