Java switch 语句 问题

Question

该程序的要点是让用户输入三个考试分数，然后将他们的平均分和字母成绩返回给他们。

它目前的编写方式给我一个关于“public static String getLetterGrade..”行的错误，我不知道为什么会这样..

public class GradeProblem
{
public static void main(String[] args)
{
 char letterGrade;
 String exam1, exam2, exam3;
 double exam1Score, exam2Score, exam3Score, average; 

 exam1 = JOptionPane.showInputDialog(null, "Enter your score for Exam 1: ");
 exam1Score = Double.parseDouble(exam1.substring(0,2));
 int intExam1Score = (int)exam1Score;

 exam2 = JOptionPane.showInputDialog(null, "Enter your score for Exam 2: ");
 exam2Score = Double.parseDouble(exam2.substring(0,2));
 int intExam2Score = (int)exam2Score;

 exam3 = JOptionPane.showInputDialog(null, "Enter your score for Exam 3: ");
 exam3Score = Double.parseDouble(exam3.substring(0,2));
 int intExam3Score = (int)exam3Score;

 average = (intExam1Score + intExam2Score + intExam3Score) / 3;

 int intAvergage = (int)average;
 letterGrade = getLetterGrade(intAverage);

 System.out.println("Your average is "+average);  
 System.out.println("Your letter grade is "+letterGrade); 

 }

 private static String getLetterGrade(average)
 {
String letterGrade;
switch(intAverage/10)
{
    case 10: letterGrade = "A";
    case 9: letterGrade = "A";
              break;
    case 8: letterGrade = "B";
              break;
    case 7: letterGrade = "C";
              break;
    case 6: letterGrade = "D";
    default:
              letterGrade = "E";
}
return letterGrade;

   }

Answer 1

应该是

 private static String getLetterGrade(int average){

或任何数据类型，并且您指的是 switch 语句中的另一个不存在的变量 intAverage