Object [] data_property = {Color.black};
    property =  new  JComboBox(data_property);
    property.setRenderer( new  ColorListRenderer());



  public   class  ColorListRenderer  extends  DefaultListCellRenderer {

     public  Component getListCellRendererComponent(JComboBox list, Object value,  int  index,  boolean  isSelected,  boolean  hasFocus){

    setText((String)value);
    setBackground((Color)value);
     return   this ;
    }
  
}

   public   class  ColorListRenderer  extends  DefaultListCellRenderer {

     public  Component getListCellRendererComponent(JList list, Object value,  int  index,  boolean  isSelected,  boolean  hasFocus){
     
      JLabel label = (JLabel) super .getListCellRendererComponent(list, value, index,   isSelected, hasFocus);
      label.setBackground((Color)value);
      label.setText(" ");
       return  label;

    
    }

}