React to the document update insert changed event

   

import java.awt.Container;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class DocumentListenerDemo extends JFrame implements DocumentListener {
  private JTextField hourField = new JTextField("12", 3);

  private JTextField minuteField = new JTextField("00", 3);

  private JLabel label = new JLabel();

  public DocumentListenerDemo() {
    setTitle("TextTest");
    setSize(500, 200);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });

    Container contentPane = getContentPane();

    JPanel p = new JPanel();

    p.add(hourField);
    hourField.getDocument().addDocumentListener(this);

    p.add(minuteField);
    minuteField.getDocument().addDocumentListener(this);

    contentPane.add(p, "Center");
    contentPane.add(label, "North");

  }

  public void insertUpdate(DocumentEvent e) {
    label.setText(e.toString());
  }

  public void removeUpdate(DocumentEvent e) {
    label.setText(e.toString());
  }

  public void changedUpdate(DocumentEvent e) {
  }

  public static void main(String[] args) {
    JFrame frame = new DocumentListenerDemo();
    frame.show();
  }

}

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React to the document update insert changed event : Document Event « Swing JFC « Java

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