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);
    }
}