嘗試獲取正確的月份以顯示最高和最低值

Question

我能夠獲得正確的最高和最低值，但它並沒有為該值輸入正確的月份。 以下是RainFall類和Rainfall程序。 這是我輸入的值（2.1、1.7、3.5、2.6、3.7、1.6、3.9、2.6、2.9、4.3、2.4、3.7）。 我將在最后顯示結果。

/**
 * RainFall class 
 */

public class RainFall 
{
    private double[] rainValue; //Rain entered by user
    private int months = 12; //Number of months in a year
    /**
    * Constructor
    */

    public RainFall(double[] rainArray)
    {
        rainValue = rainArray;
    }
    /**
     * The getRainSum method returns the sum of all 
     * rainfall for the year. 
     */
    public double getRainSum() 
    {
        double sum = 0.0; //Accumulator

        //Get sum of all values in the rain array.
        for (double value : rainValue)
            sum += value;

        return sum;


    }

    /**
     *The get RainAverage method returns the monthly  
     *rainfall average. 
     */
    public double getRainAverage()
    {
        return getRainSum() / months;
    }

    /**
     * The getRainHighest method returns the highest
     * rainfall month for the year.
     */
    public double getRainHighest()
    {
        double highest = rainValue[0]; //Get value at index 0

        //Search array for the highest value.
        for(int index = 1; index < rainValue.length; index++)
        {
            if (rainValue[index] > highest)
                highest = rainValue[index];
        }
        return highest; // return highest value
    }

    /**
     * The getRainLowest method returns the lowest
     * rainfall month for the year
     */
    public double getRainLowest()
    {
        double lowest = rainValue[0]; //Get value at index 0

        //Search array for the lowest value.
        for (int index = 1; index < rainValue.length; index++)
        {
            if (rainValue[index] < lowest)
                lowest = rainValue[index];
        }
    return lowest; //return lowest value
    }

}

測試程序：

/**
 * This program demonstrates the RainFall class.
 */
public class RainTest {

    public static void main(String[] args) 
    {

        String[] months = { "January", "February", "March",
                "April", "May", "June", "July",
                "August", "September", "October",
                "November", "December" }; //Months of the year

        //Crate an array to hold the rain values
        double[] rain = new double[12];

        //Create a Scanner object for keyboard input.
        Scanner keyboard = new Scanner(System.in);
        //Get rain values and store them 
        //in the rain array
        for (int index = 0; index < months.length; index++)
        {           
            System.out.print("Enter rain value for " + months[(index)] + ":");
            rain[index] = keyboard.nextDouble();
            if (rain[index] <0)
            {
                System.out.println("You can not use a negative number.\n");
                index--;
            }

        }

        /**
         * Create a RainFall object, passing the rain array 
         * as an argument to the constructor.
         */
        RainFall myRainFall = new RainFall(rain);

        //Display total rainfall
        System.out.println("The total rainfall for the year is: " + myRainFall.getRainSum());

        //Display average rainfall 
        System.out.println("The average rainfall for the year is: " + myRainFall.getRainAverage());

        //Display highest rainfall

        System.out.println("The month with the highest rainfall was " + months[(int) myRainFall.getRainHighest() -1] +" with " 
                            + myRainFall.getRainHighest() +" inches.");

        //Display lowest rainfall

        System.out.println("The month with the lowest rainfall was "  + months[(int) myRainFall.getRainLowest() -1] + " with " 
                           + myRainFall.getRainLowest() +" inches.");

    }

}

結果如下：

Enter rain value for January:2.1
Enter rain value for February:1.7
Enter rain value for March:3.5
Enter rain value for April:2.6
Enter rain value for May:3.7
Enter rain value for June:1.6
Enter rain value for July:3.9
Enter rain value for August:2.6
Enter rain value for September:2.9
Enter rain value for October:4.3
Enter rain value for November:2.4
Enter rain value for December:3.7
The total rainfall for the year is: 35.0
The average rainfall for the year is: 2.9166666666666665
The month with the highest rainfall was April with 4.3 inches.
The month with the lowest rainfall was January with 1.6 inches.

如您所見，最高月份應該是10月而不是4月，而最低月份應該是6月而不是1月。

預先感謝您提供的任何幫助。

Answer 1

您的問題是， getRainLowest返回的是最低月份的降雨量， 而不是最低月份的索引。 因此，以下表達式沒有任何意義：

months[(int) myRainFall.getRainLowest() - 1]

基本上，您需要定義一種不同的方法，該方法給出最低月份的索引，而不是最低月份的降雨量。 最高月份保持不變。

Answer 2

myRainFall.getRainHighest（）返回最高降雨值，而不是最高降雨值的索引。 您需要在打印正確的月份時獲得最高降雨值的索引。

Answer 3

通過調用其總降雨量並減去一個，可以得出哪個月最低/最高。 因此，作為整數的4.3-1是3，即公元前4月，這是第4個月，您數為0 1 2 3。

我將創建另一個從0開始的變量，並在看到其較低值時將其設置為索引。

Answer 4

謝謝大家。 我返回並更改了代碼以找到最高和最低索引，然后添加了一條get語句以返回該索引值。