java - 求平均值、最小值、最大值和范围

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我是 Java 初学者，我的作业阻止了我编写一段代码来查找输入的平均值、最小值、最大值和范围。这是我的全部代码，尚未完成。平均值很好，但我写的最小值和最大值甚至没有读过。谁能帮我将最小值和最大值连接到我的输入？

package averages;
import java.util.Scanner;

public class Averages {

public static void main(String[] args) {
    //initialize variables
    double sum =0;
    int count = 0;
    double grade =0;
    //initialize scanner and input
    System.out.print("Enter Grades, enter -1 to end the set:");
    Scanner in = new Scanner (System.in);
    //Process data until sentinel is entered
    while (grade != -1)
    {
        grade = in.nextDouble();
        if (grade != -1)
        {
            sum = sum + grade;
            count++;
        }
    }
   // Finding the average
    if(count > 0)
    {
        double average = sum/ count;
        System.out.println("Grade Average: "+average);
    }
    else
    {
        System.out.println("No Data");
    }
    //Finding largest grade
    double largest = in.nextDouble();
    while(in.hasNextDouble())
    {
        double input = in.nextDouble();
        if(input > largest)
        {
            largest = input;
        }
        System.out.println(largest);
    //Finding smallest grade    
    double smallest = in.nextDouble();
    while (in.hasNextDouble())
    {
        double input1 = in.nextDouble();
        if(input1 < smallest)
        {
            smallest = input;

        }
        System.out.println(smallest);
    }}}}

Answer 1

public static void main(String args[]) {

    //initialize variables
    double sum = 0;
    int count = 0;
    double grade = 0;
    double largest = Double.MIN_VALUE;
    double smallest = Double.MAX_VALUE;
    //initialize scanner and input
    System.out.print("Enter Grades, enter -1 to end the set:");
    Scanner in = new Scanner(System.in);
    //Process data until sentinel is entered
    while (grade != -1) {
        grade = in.nextDouble();
        if (grade != -1) {
            sum = sum + grade;
            if (grade > largest) {
                largest = grade;
            }
            if (grade < smallest) {
                smallest = grade;
            }

            count++;
        }
    }
    // Finding the average
    if (count > 0) {
        double average = sum / count;
        System.out.println("Grade Average: " + average);
        System.out.println("Max Grade: " + largest);
        System.out.println("Min Grade: " + smallest);
    } else {
        System.out.println("No Data");
    }
}