Swing/FontCanDisplay のバックアップ(No.1)

int code = 0x1F512;
JLabel label = new JLabel(new String(Character.toChars(code)));
label.setFont(label.getFont().deriveFont(24f));
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setVerticalAlignment(SwingConstants.CENTER);

String[] columnNames = {"family", "name", "postscript name", "canDisplay", "isEmpty"};
DefaultTableModel model = new DefaultTableModel(null, columnNames) {
  @Override public boolean isCellEditable(int row, int column) {
    return false;
  }

  @Override public Class<?> getColumnClass(int column) {
    return column > 2 ? Boolean.class : String.class;
  }
};
JTable table = new JTable(model);
Font[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
Stream.of(fonts)
    .map(f -> {
      String txt = new String(Character.toChars(code));
      FontRenderContext frc = getFontMetrics(f).getFontRenderContext();
      return new Object[] {
          f.getFamily(),
          f.getName(),
          f.getPSName(),
          f.canDisplay(code),
          f.createGlyphVector(frc, txt).getVisualBounds().isEmpty()
      };
    })
.forEach(model::addRow);