JTableのソートアイコンを変更

Icon emptyIcon = new Icon() {
  @Override public void paintIcon(Component c, Graphics g, int x, int y) {}
  @Override public int getIconWidth(){
    return 0;
  }
  @Override public int getIconHeight() {
    return 0;
  }
};
UIManager.put("Table.ascendingSortIcon", new IconUIResource(emptyIcon));
UIManager.put("Table.descendingSortIcon", new IconUIResource(emptyIcon));