java - 从 java 中的函数返回 double 和 int 值

Question

我想从 GUI 中的函数接收两个值，其中一个是 double，另一个是 int 类型。在我的检查利润接口(interface)中，我希望有两个变量的值，即profitAmount和quantityItemSold，以通过类register.java中计算的值进行更新，因为我实现java对象是通过引用传递的，所以我制作了DoubleprofitAmount和IntegerquantityItemSold的对象和通过各自的对象将它们传递给 gui 的函数。

类(class)列表

//checkProfitOfItemInterface.java

if(checkButton==btnNewButtonCheck){

    shop.checkProfit(jTextFieldItemCode.getText(),jTextFieldDate.getText(),profitAmount,quantityOfItemSold);
    System.out.println("Quantity:  "+ quantityOfItemSold + "  Profit: "+ profitAmount); 
    //model.addRow(arg0);
    model.addRow(new Object[]{"s","s",quantityOfItemSold,"s",profitAmount});
}

//shop.java

public void checkProfit(String itemCode, String date, Double profitAmount, Integer quantityOfItemSold) {

    int itemCodeInt = Integer.parseInt(itemCode);
    ItemDescription objItemDescription =itemDescriptions.get(itemCodeInt); 
    register.checkProfit(itemCode,objItemDescription,date,profitAmount,quantityOfItemSold);

}

//注册.java

public void checkProfit(String itemCode, ItemDescription itemDescription, String enteredDate,Double profitAmount, Integer quantityOfItemSold1) {

    int itemCodeInt = Integer.parseInt(itemCode);

    //GET no of sales being saved in register
    int noOfSales = sales.size();
    double salePrice=0;
    double purchasePrice =0;

    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
    Date saleDate=null;
    Date enteredDateToCheckProfitFrom = null;


    int quantityOfItemSold =0;


    for(int i=0;i<noOfSales;i++){

        Sale objSale= sales.get(i);

        //get date of required sale 
        saleDate =  objSale.getDateOfSale();
        try {
            enteredDateToCheckProfitFrom = sdf.parse(enteredDate);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //compared entered date to required sale date
        int value = enteredDateToCheckProfitFrom.compareTo(saleDate);

        if(value >= 0){

        quantityOfItemSold += objSale.getCountOfItemsInSale(itemCodeInt);
        }

    }

    salePrice =itemDescription.getSalePrice();
    purchasePrice = itemDescription.getPurchasePrice();

    double profitOnSaleOfOneItem = salePrice - purchasePrice;

    double totalProfit = quantityOfItemSold * profitOnSaleOfOneItem;

    profitAmount = totalProfit;
    quantityOfItemSold1 = quantityOfItemSold;

    System.out.println("Quantity:  "+ quantityOfItemSold1 + "  Profit: "+ profitAmount);

}

Answer 1

听起来您想使用 Pair 类来保存 Double 和 Integer 对象。

Generic pair class