|
| |
| 15. 13. 3. 监听JTextField事件，DocumentListener |
|
|
|
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;
public class AddingDocumentListenerJTextFieldSample {
public static void main(String args[]) {
final JFrame frame = new JFrame("Default Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField textField = new JTextField();
frame.add(textField, BorderLayout.NORTH);
DocumentListener documentListener = new DocumentListener() {
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
String typeString = null;
if (type.equals(DocumentEvent.EventType.CHANGE)) {
typeString = "Change";
} else if (type.equals(DocumentEvent.EventType.INSERT)) {
typeString = "Insert";
} else if (type.equals(DocumentEvent.EventType.REMOVE)) {
typeString = "Remove";
}
System.out.print("Type : " + typeString);
Document source = documentEvent.getDocument();
int length = source.getLength();
System.out.println("Length: " + length);
}
};
textField.getDocument().addDocumentListener(documentListener);
frame.setSize(250, 150);
frame.setVisible(true);
}
}
|
|
|
