Question

我写了一个关于计算一年下雨平均值的程序，给我最高和最低的数量，但是我收到了一个错误，我无法修复它。

这是我的主要代码：`

public class Rainfall {

//field 
private double [] rain;

public void Rainfall (double [] array) {

    rain = new double [array.length] ; 

    for (int i=0; i < array.length ; i++) 

        rain [i] = array [i];   
}

//Methods
public double getTotal() {

    double total = 0;

    for ( double r : rain)

total +=r;
    return total;

}

public double getAverage () {

    double a = getTotal () / rain.length;

    return a;
}

public double getHighest () { 

    double highest = rain [0];

    for (int i=0 ; i < rain.length; i++) { 

        if (rain [i] > highest) ;
        highest = rain [i];
}
    return highest;         
}

public double getLowest () {

    double lowest = rain [0];

    for ( int i=0; i <rain.length; i++) { 

        if (rain [i] < lowest) ;

        lowest = rain [i];
    }
    return lowest;
}

}

` 这是演示：

`
  import java.util.Scanner;
  import java.text.DecimalFormat;


  public class RainFallDemo { 

    public static void main (String [] args ) throws NullPointerException
 { 


        final int year1 = 12;

        double [] rains = new double [year1];

        getData (rains) ;

        Rainfall rainfallData = new Rainfall ();

        DecimalFormat values = new DecimalFormat ("#0.00") ;

        System.out.println("The total rain is" + values.format(rainfallData.getTotal()));
        System.out.println("The average is " + values.format (rainfallData.getAverage()));
        System.out.println("The highest rain is " + values.format (rainfallData.getHighest()));
        System.out.println("The lowest is " + values.format (rainfallData.getLowest()));




    }

    public static void getData (double [] array) {

        Scanner keyboard = new Scanner (System.in) ;

        for ( int i=0 ; i < array.length; i++) 
        {

            System.out.println ("what was the amont of rain for month  " + (i + 1) + "?");

            array [i] = keyboard.nextDouble ();

            while (array[i] < 0 )
            {
                System.out.print ( " Invalid input. You entered a negative number. Enter a" + 
            "value that is greater than zero");
            array [i] = keyboard.nextDouble ();

            }
    }
}
}`

我得到了错误的最低和最高错误，程序必须显示哪个月的输出中最低和最高，但我无法弄清楚代码!!

Answer 1

删除if行末尾的分号。这导致if在为真时执行空语句。然后无论如何都会执行下一行。

java中RainFall程序的输出错误

1 个答案: