用JAVA怎么编写录入班级人数和学员成绩计算班级学员的平均成绩

import java.util.Scanner;
public class Average {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int sco=0,sum=0,n;
double ave=0.0;
Scanner input=new Scanner(System.in);
System.out.println("请输入学生人数：");
n=input.nextInt();
for(int i=1;i