急,急,急,为什么这段代码通不过编译呀?

Question

System.in.read();
System.in.skip(1);
Exception has not been caught!

Answer 1

import java.io.*;public class Average{
    public static void main(String args[]){
        int counter,grade,total,average;
        
        total=0;
        counter=1;
        try{
        
        
        while(counter<=10){
            System.out.print("Enter letter grade:");
            System.out.flush();
            grade=System.in.read();
            
            if(grade=='A')
                total=total+4;
            else if(grade=='B')
                total=total+3;
            else if(grade=='C')
                total=total+2;
            else if(grade=='D')
                total=total+1;
            else if(grade=='E')
                total=total+0;
            System.in.skip(1);
            counter=counter+1;
        }
        }catch(IOException ex){
         System.out.println(ex.getMessage());
        }
        average=total/10;
        System.out.println("\"Class average is \""+ average);
    }
}