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JLabel : PropertyChangeListener

JTextField : DocumentListener

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
 
public class TestClass {
    JLabel mLabel = new JLabel("TEST");
    JTextField mTextField = new JTextField("TEST");
 
    TestClass() {
        mLabel.addPropertyChangeListener(new MyChangeListener());
        mTextField.getDocument().addDocumentListener(new MyDocumentListener());
    }
 
    private class MyChangeListener implements PropertyChangeListener {
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            if ("text".equals(evt.getPropertyName())) {
 
            }
        }
    }
 
    private class MyDocumentListener implements DocumentListener {
        @Override
        public void insertUpdate(DocumentEvent e) {
 
        }
 
        @Override
        public void removeUpdate(DocumentEvent e) {
 
        }
 
        @Override
        public void changedUpdate(DocumentEvent e) {
 
        }
    }
}