java - 仅打印用户输入的且严格小于平均值的数字

Question

现在计算平均值，我正在尝试仅在其自己的行中打印出严格小于平均值的用户输入。我尝试这样做，但是出现错误“二元运算符“<”的错误操作数。

import java.util.Scanner;
    public class avg
    {
        public static void main (String args[])
        {
            Scanner in = new Scanner(System.in);
            System.out.println("Enter some numbers(Ctrl-d to quit):");
            double[] myArray = new double[10];
            int howMany = 0;
            double sum=0 ;
            double avg=0;
            while (in.hasNextDouble()) // Ctrl-D to terminate
            {
                double userVal = in.nextDouble();
                myArray[howMany++] = userVal;

                if ( howMany >= myArray.length )
                {
                    //myArray.length = myArray.length * 2;
                    double[] tempArray = new double[2 * myArray.length];

                    for (int i = 0; i < howMany; i++)
                        tempArray[i] = myArray[i];
                    myArray = tempArray;        
                }
            }
            for (int i = howMany - 1; i >= 0; i--)
            {
            sum += myArray[i];
            }
            avg = sum/howMany;
            System.out.print("Average: "+ avg);
            System.out.println(myArray<avg);// to print numbers that the user entered only which are strictly less than the avg. This did not work//

    }
}

Answer 1

for (int i = howMany - 1; i >= 0; i--){
     sum+=myArray[i];//sum up the array
}
avg = sum / howMany;

要在一行中打印每个double:

System.out.println(avg);

for (int i = 0; i < howMany; i++) {
    if(myArray[i] < avg){
        System.out.println(myArray[i]);//single line for every double
    }
}

在一行中打印所有double:

String oneLine = "["; 
int lowerAvg = 0;
for (int i = 0; i < howMany; i++) {
if(myArray[i] < avg){
        oneLine += (i > 0 && ++lowerAvg > 0)?", ":""; // add separator
        oneLine += (myArray[i]);
    }
}
oneLine+="]";
System.out.println(oneLine);//prints like [1.0, 2.0, ...]

使用 Java 8:

avg = Arrays.stream(myArray, 0, howMany).average().orElse(0);
final double finalAvg = avg;//final variable to use in filter condition
System.out.println(finalAvg);
Arrays.stream(myArray, 0, howMany).filter(x -> x < finalAvg).forEach(System.out::println);//will print every double in a single line
System.out.println(Arrays.toString(Arrays.stream(myArray, 0, howMany).filter(x -> x < finalAvg).toArray()));//Will print the array like [1.0, 2.0, ...]