Finding num values, and min/ max values in Java

I am struggling with this code. I need to write a program that reads in an arbitrary num of data points from standerd input. Then returns the number of values, the min/max, and average value. I have not made much progress but here is all i have. Thanks in advance for help.

import java.util.Scanner; 
public class Assignment4 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String Date = 0;
        while (inputStream.hasNextDouble ()) {

                date = inputStream.nextDouble ();

                System.out.println ();
        }
    }

}