以下java程序有什么错误？求解答
下面程序有什么错误？请高手解答哈谢了
这道题主旨是输入五位同学成绩（0——100）求总分，平均分之类的，下面这个程序可以输入数据但就是不能用方法求出总数，平均分等等
package homeWork;
import java.util.*;
import javax.swing.JOptionPane;
public class fivestudentgrade {
private static double[] score;
public static void main (String[] args){
System.out.println("请输入五位学生的成绩：");
double [] score=new double[5];
for(int i=0;i<5;i=i+1)
{
Scanner scanner=new Scanner(System.in);
double a=scanner.nextDouble();
if(a<0||a>100)
System.out.println("Plase enter again");
else
score[i]=a;
}
int choice = mainMenu();
while(choice!= 5)
{
switch(choice)
{
case 1:
sumGrade();
break;
case 2:
averageGrade();
break;
case 3:
highGrade();
break;
case 4:
lowestGrade();
default:
System.out.println("Not a valid option, select again");
}
}
}
public static int mainMenu()
{
JOptionPane.showMessageDialog( null,"1.sumgrade"+"\n"+
"2.averagegrade"+"\n"+"3.highestgrade"+"\n"+
"4.lowestgrade"+"\n"+"5.Exit");
/*System.out.println("1.sumgrade");
System.out.println("2.averagegrade");
System.out.println("3.highestgrade");
System.out.println("4.lowestgrade");
System.out.println("5.Exit");
*/
System.out.println("Enter an option ");
Scanner scanner = new Scanner(System.in);
int i = scanner.nextInt();
return i;
}
public static void sumGrade()
{
double sumGrade=0.0;
for(int i=0;i<5;i++)
{
sumGrade=score[i]+sumGrade;
}
System.out.println("sumGrade="+sumGrade);
}
public static void averageGrade()
{
for(int i=0;i<5;i++)
{
double average=0.0;
average=score[i]/5+average;
}
}
public static void highGrade()
{
double maxgrade=0.0;
for(int i=0;i<5;i++)
{
if(score[i]>maxgrade)maxgrade=score[i];
}
System.out.println("maxgrade="+maxgrade);
}
public static void lowestGrade()
{
double mingrade=0.0;
for(int i=0;i<5;i++)
{
if(score[i]<mingrade)mingrade=score[i];
}
System.out.println("mingrade="+mingrade);
}
}
[解决办法]
package com.exchange;import java.util.Scanner;import javax.swing.JOptionPane;public class Fivestudentgrade { private static double[] score; public static void main(String[] args) { System.out.println("请输入五位学生的成绩："); score = new double[5]; for (int i = 0; i < 5; i = i + 1) { Scanner scanner = new Scanner(System.in); double a = scanner.nextDouble(); if (a < 0 || a > 100) System.out.println("Plase enter again"); else score[i] = a; } int choice = mainMenu(); switch (choice) { case 1: sumGrade(); break; case 2: averageGrade(); break; case 3: highGrade(); break; case 4: lowestGrade(); break; case 5: System.exit(1); default: System.out.println("Not a valid option, select again"); } } public static int mainMenu() { JOptionPane.showMessageDialog(null, "1. sumgrade" + "\n" + "2. averagegrade" + "\n" + "3. highestgrade" + "\n" + "4. lowestgrade" + "\n" + "5. Exit","菜单",JOptionPane.PLAIN_MESSAGE); System.out.println("Enter an option "); Scanner scanner = new Scanner(System.in); int i = scanner.nextInt(); return i; } public static void sumGrade() { double sumGrade = 0.0; for (int i = 0; i < 5; i++) { sumGrade = score[i] + sumGrade; } System.out.println("sumGrade=" + sumGrade); } public static void averageGrade() { double average = 0.0; for (int i = 0; i < 5; i++) { average = score[i] / 5 + average; } System.out.println("average="+average); } public static void highGrade() { double maxgrade = 0.0; for (int i = 0; i < 5; i++) { if (score[i] > maxgrade) maxgrade = score[i]; } System.out.println("maxgrade=" + maxgrade); } public static void lowestGrade() { double mingrade = 0.0; for (int i = 0; i < 5; i++) { if (score[i] < mingrade) mingrade = score[i]; } System.out.println("mingrade=" + mingrade); }}