非法转换异常？

Question

我在代码中收到一条错误消息，用于查找支付 200 美元的员工的总工资 + 佣金金额。一旦输入了所有员工的总销售额，就应该打印出属于每个不同薪酬类别的员工数量。代码如下：

public static void main(String[]args){
    Scanner input = new Scanner(System.in);
    int basePay = 200; //$200 starting amount of pay
    int totalPay = 0; //total amount the employee will receive

    System.out.print("Enter the amount of employees: ");
    int employee = input.nextInt();

    int[]sales = new int[9]; //four different categories

    for(int i = 0; i < employee; i++){
        System.out.println("Enter the current employee's gross sales: ");
        int grossSales = input.nextInt();

        totalPay = (int) (basePay + (grossSales * 0.09)); //uses the formula for finding pay, and then casts it to an int

        if(totalPay <= 299.99){
            sales[0]++;
        }
        else if(totalPay <= 399.99){
            sales[1]++;
        }
        else if(totalPay <= 499.99){
            sales[2]++;
        }
        else if(totalPay <= 599.99){
            sales[3]++;
        }
        else if(totalPay <= 699.99){
            sales[4]++;
        }
        else if(totalPay <= 799.99){
            sales[5]++;
        }
        else if(totalPay <= 899.99){
            sales[6]++;
        }
        else if(totalPay <= 999.99){
            sales[7]++;
        }
        else if(totalPay >= 1000){
            sales[8]++;
        }
    }
    System.out.println("Total Sales\tAmount of employees");

    for(int i = 0; i < 11; i++){
        System.out.printf("%02d-%02d: ", i * 100, i * 100 + 99.99);
        System.out.print("\t" + sales[i]);
    }

    System.out.println("Checking array: " + Arrays.toString(sales));
}

这是我得到的确切错误消息：

00-Exception in thread "main" java.util.IllegalFormatConversionException: d != java.lang.Double
    at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)
    at java.util.Formatter$FormatSpecifier.printInteger(Unknown Source)
    at java.util.Formatter$FormatSpecifier.print(Unknown Source)
    at java.util.Formatter.format(Unknown Source)
    at java.io.PrintStream.format(Unknown Source)
    at java.io.PrintStream.printf(Unknown Source)
    at chapter7.Sales_comission.main(Sales_comission.java:54)

我相信这与双重转换有关，但我不确定它有什么问题？谁能帮我找出问题所在（编译时没有错误）？我也试过只有双打（包括数组），但这并没有解决问题。

Answer 1

'd' 表示整数，要么将其更改为'f'，要么将第二个参数转换为整数。

 System.out.printf("%02d-%02d: ", i * 100, (int)(i * 100 + 99.99));

详情请参阅Java String Formatter Doc。