A sample for Font usage in Codename One that goes over all of the "big pieces" in Codename One fonts to display a large catalog of "whats available"

FontCatalog.java

private Label createForFont(Font fnt, String s) {
  Label l = new Label(s);
  l.getUnselectedStyle().setFont(fnt);
  return l;
}

public void showForm() {
  GridLayout gr = new GridLayout(5);
  gr.setAutoFit(true);
  Form hi = new Form("Fonts", gr);
  
  int fontSize = Display.getInstance().convertToPixels(3);
  
  // requires Handlee-Regular.ttf in the src folder root!
  Font ttfFont = Font.createTrueTypeFont("Handlee", "Handlee-Regular.ttf").
                      derive(fontSize, Font.STYLE_PLAIN);
  
  Font smallPlainSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL);
  Font mediumPlainSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
  Font largePlainSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_LARGE);
  Font smallBoldSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_SMALL);
  Font mediumBoldSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_MEDIUM);
  Font largeBoldSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_LARGE);
  Font smallItalicSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_ITALIC, Font.SIZE_SMALL);
  Font mediumItalicSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_ITALIC, Font.SIZE_MEDIUM);
  Font largeItalicSystemFont = Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_ITALIC, Font.SIZE_LARGE);
  
  Font smallPlainMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_PLAIN, Font.SIZE_SMALL);
  Font mediumPlainMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
  Font largePlainMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_PLAIN, Font.SIZE_LARGE);
  Font smallBoldMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_SMALL);
  Font mediumBoldMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_MEDIUM);
  Font largeBoldMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_LARGE);
  Font smallItalicMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_ITALIC, Font.SIZE_SMALL);
  Font mediumItalicMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_ITALIC, Font.SIZE_MEDIUM);
  Font largeItalicMonospaceFont = Font.createSystemFont(Font.FACE_MONOSPACE, Font.STYLE_ITALIC, Font.SIZE_LARGE);
  
  Font smallPlainProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_SMALL);
  Font mediumPlainProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
  Font largePlainProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_LARGE);
  Font smallBoldProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL);
  Font mediumBoldProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_MEDIUM);
  Font largeBoldProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_LARGE);
  Font smallItalicProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_ITALIC, Font.SIZE_SMALL);
  Font mediumItalicProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_ITALIC, Font.SIZE_MEDIUM);
  Font largeItalicProportionalFont = Font.createSystemFont(Font.FACE_PROPORTIONAL, Font.STYLE_ITALIC, Font.SIZE_LARGE);
  
  String[] nativeFontTypes = {
      "native:MainThin", "native:MainLight", "native:MainRegular", "native:MainBold", "native:MainBlack",
      "native:ItalicThin", "native:ItalicLight", "native:ItalicRegular", "native:ItalicBold", "native:ItalicBlack"};
  
  for(String s : nativeFontTypes) {
      Font tt  = Font.createTrueTypeFont(s, s).derive(fontSize, Font.STYLE_PLAIN);
      hi.add(createForFont(tt, s));
  }
  
  hi.add(createForFont(ttfFont, "Handlee TTF Font")).
          add(createForFont(smallPlainSystemFont, "smallPlainSystemFont")).
          add(createForFont(mediumPlainSystemFont, "mediumPlainSystemFont")).
          add(createForFont(largePlainSystemFont, "largePlainSystemFont")).
          add(createForFont(smallBoldSystemFont, "smallBoldSystemFont")).
          add(createForFont(mediumBoldSystemFont, "mediumBoldSystemFont")).
          add(createForFont(largeBoldSystemFont, "largeBoldSystemFont")).
          add(createForFont(smallPlainSystemFont, "smallItalicSystemFont")).
          add(createForFont(mediumItalicSystemFont, "mediumItalicSystemFont")).
          add(createForFont(largeItalicSystemFont, "largeItalicSystemFont")).
  
          add(createForFont(smallPlainMonospaceFont, "smallPlainMonospaceFont")).
          add(createForFont(mediumPlainMonospaceFont, "mediumPlainMonospaceFont")).
          add(createForFont(largePlainMonospaceFont, "largePlainMonospaceFont")).
          add(createForFont(smallBoldMonospaceFont, "smallBoldMonospaceFont")).
          add(createForFont(mediumBoldMonospaceFont, "mediumBoldMonospaceFont")).
          add(createForFont(largeBoldMonospaceFont, "largeBoldMonospaceFont")).
          add(createForFont(smallItalicMonospaceFont, "smallItalicMonospaceFont")).
          add(createForFont(mediumItalicMonospaceFont, "mediumItalicMonospaceFont")).
          add(createForFont(largeItalicMonospaceFont, "largeItalicMonospaceFont")).
  
          add(createForFont(smallPlainProportionalFont, "smallPlainProportionalFont")).
          add(createForFont(mediumPlainProportionalFont, "mediumPlainProportionalFont")).
          add(createForFont(largePlainProportionalFont, "largePlainProportionalFont")).
          add(createForFont(smallBoldProportionalFont, "smallBoldProportionalFont")).
          add(createForFont(mediumBoldProportionalFont, "mediumBoldProportionalFont")).
          add(createForFont(largeBoldProportionalFont, "largeBoldProportionalFont")).
          add(createForFont(smallItalicProportionalFont, "smallItalicProportionalFont")).
          add(createForFont(mediumItalicProportionalFont, "mediumItalicProportionalFont")).
          add(createForFont(largeItalicProportionalFont, "largeItalicProportionalFont"));
  
  hi.show();
}

Sample usage of Font.

From the Codename One project