Thanks to devsundar I found out how to make the selected text in a JEditorPane bold/underline/italics/whatever. How can I set the Font Size of the selected Text in a JEditorPane?
My Current Method Of changing bold/italics/etc:
 AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
    StyleConstants.StrikeThrough, true);
 pane.getStyledDocument().setCharacterAttributes(pane.getSelectionStart(),
    pane.getSelectionEnd(), aset, true);
