AddingDocumentListenerJTextFieldSample.java Source code

Introduction

Here is the source code for AddingDocumentListenerJTextFieldSample.java

Source

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);
    }
}