JAVA -从键盘上输入若干个学生的成绩，统计并输出最高成绩、最低成绩和平均成绩，当输入负数时结束输入。

1. 1. 1. 1. package com.hg.demo;
         3. import java.util.Scanner;
         5. public class demo02 {
         7.   public static void main(String[] args) {
         8.          // TODO Auto-generated method stub
         9.         double max = 0;
         10.         double min = 0;
         11.         double sum = 0;
         12.         
         13.          Scanner scanner = new Scanner(System.in);
         14.          System.out.println("请输入学生成绩：");
         15.          double b= scanner.nextDouble();
         16.          min = b;
         17.          max = b;
         18.          sum+=b;
         19.          int m = 1;
         20.          while(scanner.hasNextDouble()) {
         21.                 double a = scanner.nextDouble();
         22.                 if (a<0) {
         23.                        break;
         24.                 }
         25.                 if (a>max) {
         26.                        max = a;
         27.                 }
         28.                 if (a<min) {
         29.                        min = a;
         30.                 }
         31.                 sum += a;
         32.                 m++;
         33.          }
         34.          System.out.println("最大值为："+max);
         35.          System.out.println("最小值为："+min);
         36.          System.out.println("总和为："+sum);
         37.          System.out.println("个数为："+m);
         38.          System.out.println("平均值为："+sum/m);
         39.         
         40.          scanner.close();
         41.   }
         42.  
         43. }