JEditorPane mit unsichtbarem Text

javax.swing.JEditorPane
Möchte man Text in einer JEditorPane verstecken, so kann man sich eines kleines Tricks bedienen.
Man erzeugt einen Style mit eine Fontgröße von 0 Pixeln:

import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
import java.awt.BorderLayout;
import java.awt.Container;
 
public class UnvisibleText extends JFrame {
   public UnvisibleText() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setSize(400, 300);
      setLocationRelativeTo(null);
 
      init();
   }
 
   private void init() {
      Container cp = getContentPane();
      cp.setLayout(new BorderLayout());
      JEditorPane editor = new JEditorPane();
      cp.add(new JScrollPane(editor), BorderLayout.CENTER);
 
      initEditorWithText(editor);
   }
 
   private void initEditorWithText(JEditorPane editor) {
      editor.setContentType("text/rtf");
      StyledDocument doc = (StyledDocument) editor.getDocument();
      Style defaultStyle = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
      Style invisibleStyle = doc.addStyle("invisible", defaultStyle);
      StyleConstants.setFontSize(invisibleStyle, 0);
      StyleConstants.setForeground(invisibleStyle, editor.getBackground());
      try {
         doc.insertString(doc.getLength(), "Hello ", null);
         doc.insertString(doc.getLength(), "crazy ", doc.getStyle("invisible"));
         doc.insertString(doc.getLength(), "world!", null);
         System.out.println("Gesamter Text: " + doc.getText(0, doc.getLength()));
      } catch (BadLocationException e) {
         e.printStackTrace();
      }
   }
 
   public static void main(String[] args) {
      new UnvisibleText().setVisible(true);
   }
}