Question

我能够获得正确的最高值和最低值，但它没有使用该值设置正确的月份。以下是RainFall Class和Rainfall计划。以下是我输入的值（2.1,1.7,3.5,2.6,3.7,1.6,3.9,2.6,2.9,4.3,2.4,3.7）。我将在最后展示结果。

/**
 * 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
    }

}

测试程序：

/**
 * 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.");

    }

}

结果如下：

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.

正如您所看到的，最高月份应该是10月而不是4月，最低月份应该是6月而不是1月。

提前感谢您提供的任何帮助。

Answer 1

您的问题是/dist会返回最低月份的降雨量，不是最低月份的指数。因此，以下表达没有意义：

getRainLowest

您基本上需要定义一个不同的方法，该方法给出最低月份的指数，而不是最低月份的降雨量。最高月份也是如此。

Answer 2

myRainFall.getRainHighest（）返回最高降雨量值而不是最高降雨量值的指数。在打印正确的月份时，您需要获得最高降雨量的指数。

Answer 3

通过调用总降雨量并减去一个月，您可以获得最低/最高的月份。所以4.3 - 1作为int是3，这是4月bc它是第4个月你算0 1 2 3.

我会创建另一个从0开始的变量，并在看到它的较低时将其设置为索引。

Answer 4

谢谢大家。我回去并更改了代码以找到最高和最低索引，然后添加了一个get语句来返回该索引值。

尝试使用最高和最低值显示正确的月份

4 个答案: