判断两个日期是否为同一天

	SimpleDateFormat sf = new SimpleDateFormat("dd/MM/yyyy");//隨便寫一種日期格式
	String tadeDate = sf.format(trade.getTradeDate());//数据库中取到的日期
	String uiTradeDate = tradeDatePopupField.getValue() != null ? sf.format(formatDate(tradeDatePopupField.getValue())) : null;//UI上取到的日期
	String settlementDate = sf.format(trade.getSettlementDate());
	if(tadeDate != null && !tadeDate.equals(uiTradeDate)){
	  System.out.println("不是同一天"); 
	}