kalinga1234

i am having a diifficulty in solving this problem.
the user enter student name,and it ask for 5 grades.The grades should be only A,B,C,D,F..i did it but cannot get the answer..becoz it does not validate the characters ..i will post the code..


import javax.swing.*;
import java.io.*;
class CalculateGrade
{

public static void main(String args[])throws IOException
{

char grade=' ';




System.out.println("Grade marks"+"\t\t"+"Points"+"\n");
System.out.println("=================================");
System.out.println("A"+"\t\t\t"+"4"+"\t\t"+"\n");
System.out.println("B"+"\t\t\t"+"3"+"\t\t"+"\n");
System.out.println("C"+"\t\t\t"+"2"+"\t\t"+"\n");
System.out.println("D"+"\t\t\t"+"1"+"\t\t"+"\n");
System.out.println("E"+"\t\t\t"+"0"+"\t\t"+"\n");

for(int a=1;a<=10;a++)
{
System.out.println();
System.out.println("STUDENT#"+a);
System.out.println("=========");
String name=JOptionPane.showInputDialog("enter student#"+a);
char response=userGrade(grade);


}
}
public static char userGrade(char chr)throws IOException
{
char ans=' ';
char response=' ';

for(int a=1;a<=5;a++)
{
System.out.println();
System.out.println("Grade#"+a);
System.out.println("==========");
System.in.read();
System.in.read();
ans=(char)System.in.read();
}

return ans;
}




}