Java font size - how to change the JTextArea, JTextPane, JEditorPane font size

I'm currently writing a customized text editor in Java, and as part of that, I want to make it easy for the user to increase or decrease the font size in the text editing area (technically a JTextPane). I didn't expect this to be easy, but I've been pleasantly surprised that the following approach seems to work just fine:

 * Reduce the size of the font in the JTextPane editor area.
public void doSmallerFontSizeAction()
  // get the current font
  Font f = editingArea.getFont();

  // create a new, smaller font from the current font
  Font f2 = new Font(f.getFontName(), f.getStyle(), f.getSize()-1);

  // set the new font in the editing area

Java smaller font size action - discussion

As you can see from that code, I do the following things:

  • I get the current font from the JTextPane.
  • I create the Font f2 by using that font information, but making the font size one size smaller.
  • I set my new font on the JTextPane.

This changes the font for the entire JTextPane, which is what I want. (Although the JTextPane has many more font features, I'm just creating a simple text editor, so I'm only using one font at a time in the text editing area.)

It's also worth mentioning that I have a similar method that increases the text area font size. As you can imagine, the code is identical, except I increment the font size by one instead of decrementing it.

Java font size methods comes from JTextComponent

As mentioned, I'm using this code with a JTextPane but the getFont and setFont methods both come from the JTextComponent class, so I expect this same approach would work with the JTextField JTextArea and JEditorPane classes as well.