Methods & Switch Statement in java.. HELP!!

Question

hi all...
i am having a slight problem as i am constructing a method --> menu() which handles displaying
menu options on the screen, prompting the user to select A, B, C, D, S or Q... and then returns the user
input to the main method!!!
i am having issues with switch statement which processes the return from menu() methd,,,
could you please help?!!
here is my code...
import java.text.*;
import java.io.*;
public class StudentDriver
   public static void main(String[] args) throws IOException
      for(;;)
         /* Switch statement for menu manipulation */
         switch(menu())
               case A: System.out.println("You have selected option A");
                              break;
               case B: System.out.println("You have selected option B");
                              break;
               case C: System.out.println("You have selected option C");
                              break;
               case D: System.out.println("You have selected option D");
                              break;
               case S: System.out.println("You have selected option S");
                              break;
               case Q: System.out.println("\n\n\n\n\n\n\t\t Thank you for using our system..." +
                                                                "\n\n\t\t\t Good Bye \n\n\n\n");
                              exit(0);    
   static char menu()
      char option;
      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));       
      System.out.println("\n\n");
      System.out.println("\n\t\t_________________________");
      System.out.println("\t\t|                       |");
      System.out.println("\t\t| Student Manager Menu  |");
      System.out.println("\t\t|_______________________|");
      System.out.println("\n\t________________________________________");
      System.out.println("\t| \t\t\t\t\t|");
      System.out.println("\t| Add new student\t\t A \t|");
      System.out.println("\t| Add credits\t\t\t B \t|");
      System.out.println("\t| Display one record\t\t C \t|");
      System.out.println("\t| Show the average credits\t D \t|");
      System.out.println("\t| \t\t\t\t\t|");
      System.out.println("\t| Save the changes\t\t S \t|");
      System.out.println("\t| Quit\t\t\t\t Q \t|");
      System.out.println("\t|_______________________________________|\n");
      System.out.print("\t  Your Choice: ");
      option = stdin.readLine();
         return option;
}Thanking your help in advance...
yours...
khalid

Answer 1

Hi,
There are few changes which u need to make for making ur code work.
1) In main method, in switch case change case A: to case 'A':
Characters should be represented in single quotes.
2) in case 'Q' change exit(0) to System.exit(0);
3) The method static char menu() { should be changed to static char menu() throws IOException   {
4) Change option = stdin.readLine(); to
option = (char)stdin.read();
Then compile and run ur code. This will work.
Or else just copy the below code
import java.text.*;
import java.io.*;
public class StudentDriver{
     public static void main(String[] args) throws IOException {
          for(;;) {
               /* Switch statement for menu manipulation */
               switch(menu()) {
                    case 'A': System.out.println("You have selected option A");
                    break;
                    case 'B': System.out.println("You have selected option B");
                    break;
                    case 'C': System.out.println("You have selected option C");
                    break;
                    case 'D': System.out.println("You have selected option D");
                    break;
                    case 'S': System.out.println("You have selected option S");
                    break;
                    case 'Q':
                    System.out.println("\n\n\n\n\n\n\t\t Thank you for using our system..." +
                    "\n\n\t\t\t Good Bye \n\n\n\n");
                    System.exit(0);
     static char menu() throws IOException {
          char option;
          BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
          System.out.println("\n\n");
          System.out.println("\n\t\t_________________________");
          System.out.println("\t\t| |");
          System.out.println("\t\t| Student Manager Menu |");
          System.out.println("\t\t|_______________________|");
          System.out.println("\n\t________________________________________");
          System.out.println("\t| \t\t\t\t\t|");
          System.out.println("\t| Add new student\t\t A \t|");
          System.out.println("\t| Add credits\t\t\t B \t|");
          System.out.println("\t| Display one record\t\t C \t|");
          System.out.println("\t| Show the average credits\t D \t|");
          System.out.println("\t| \t\t\t\t\t|");
          System.out.println("\t| Save the changes\t\t S \t|");
          System.out.println("\t| Quit\t\t\t\t Q \t|");
          System.out.println("\t|_______________________________________|\n");
          System.out.print("\t Your Choice: ");
          option = (char)stdin.read();
          return option;
regards
Karthik