Question

这是关于在toString方法中定位字符串的问题：即“获得利润”部分。我知道这可以通过单独的showProfit()方法来实现，但问题不允许。必须使用toString()方法显示所有内容。

public String toString(){
    String str = String.format("%-10s", drinkID);

    str += String.format("%15s%.2f", "Cost Price: $",drinkCostPrice);
    str += String.format("%20s%.2f", "Selling Price: $", drinkSellPrice);
    str += String.format("%18s%d", "Quantity Sold: ", drinkQuantitySold);
    str += String.format("\nProfit Earned for %s:$%.2f", drinkID, computeProfit());
    return str;
}

哪个输出：

    latte       Cost Price: $2.00    Selling Price: $3.50   Quantity Sold: 30
    Profit Earned for latte:$45.00
    mocca       Cost Price: $2.00    Selling Price: $4.00   Quantity Sold: 30
    Profit Earned for mocca:$60.00
    espresso    Cost Price: $1.00    Selling Price: $3.00   Quantity Sold: 20
    Profit Earned for espresso:$40.00

但我要输出的是：

    latte       Cost Price: $2.00    Selling Price: $3.50   Quantity Sold: 30
    mocca       Cost Price: $2.00    Selling Price: $4.00   Quantity Sold: 30
    espresso    Cost Price: $1.00    Selling Price: $3.00   Quantity Sold: 20

    Profit Earned for latte:$45.00
    Profit Earned for mocca:$60.00
    Profit Earned for espresso:$40.00

即。 “获利”部分分开。

如何在不使用其他功能的情况下完成这项工作？

Answer 1

使用while循环浏览Drink[]或<List>Drink以获取：

latte Cost Price: $2.00 Selling Price: $3.50 Quantity Sold: 30 mocca Cost Price: $2.00 Selling Price: $4.00 Quantity Sold: 30 espresso Cost Price: $1.00 Selling Price: $3.00 Quantity Sold: 20
然后第二次循环再次运行它们以打印出所赚取的利润。你可以用一种方法完成所有这些。

定位在toString（）方法中，Java

1 个答案: