在编写学生成绩表时，大体做出来了，可是不会写每科成绩的最高分与每科成绩的平均分。

import java.util.Scanner;
public class fanxu{
 public static void main(String args[]){
    Scanner input =new Scanner(System.in);
    System.out.println("你要输入多少个学生？");
    int renshu=input.nextInt();
    System.out.println("你要输入多少个科目？");
    int courseNum=input.nextInt();
    String name[]=new String[renshu];
    String course[]=new String[courseNum];
    int number[][]=new int[renshu][courseNum];
    int sum[]=new int[renshu];
    int avg[]=new int[renshu];
   String str[]=new String[renshu];
    for(int i=0;i<course.length;i++){
       System.out.println("请你输入第"+(i+1)+"个科目名称");
       course[i]=input.next();
       }      
        for(int i=0;i<renshu;i++){
            int s=0;
       System.out.println("请你输入第"+(i+1)+"学生名字");
       name[i]=input.next();
       String str11="";
       for(int j=0;j<courseNum;j++){
            System.out.println("这个学生"+name[i]+course[j]+"的成绩：");
            number[i][j]=input.nextInt();  
            s=s+number[i][j];
             str11=str11+number[i][j]+"\t";         
        }      
        sum[i]=s;
        avg[i]=s/courseNum;
        str[i]=name[i]+"\t"+str11+sum[i]+"\t"+avg[i];
       }  
       for(int i=0;i<sum.length;i++){
           for(int j=0;j<sum.length-1;j++)
           if(sum[j]<sum[j+1]){
               int t=sum[j];            
               sum[j]=sum[j+1];
               sum[j+1]=t;
               String t1=str[j];
             str[j]=str[j+1];
             str[j+1]=t1;               
               }
           }
       System.out.println("学生");
       { for(int i=0;i<course.length;i++)
        System.out.print("\t"+course[i]);
        System.out.print("\t总分\t平均分\t排行榜");
                System.out.println();
                for(int i=0;i<renshu;i++){
                    System.out.println(str[i]);
          }
    }
}
}