Java by API/javax.swing.event/DocumentListener

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implements DocumentListener

   <source lang="java">

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.InputVerifier; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JTextField; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.JTextComponent; public class MainClass {

 public static void main(String args[]) throws Exception {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JTextField nameTextField = new JTextField();
   frame.add(nameTextField, BorderLayout.NORTH);
   frame.add(new JTextField(), BorderLayout.SOUTH);
   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();
       try {
         System.out.println("Contents: " + source.getText(0, length));
       } catch (BadLocationException badLocationException) {
         System.out.println("Contents: Unknown");
       }
     }
   };
   nameTextField.getDocument().addDocumentListener(documentListener);
   
   frame.setSize(250, 100);
   frame.setVisible(true);
 }

}


      </source>