Program to find whether entered character is a vowel constant number or a special character

import java.io.*;
 class stch {
 public static void main(String [] args) throws IOException  {
  char ch;
  DataInputStream din=new DataInputStream(System.in);
  System.out.println("Enter the character: ");
  ch=(char)(din.read());
     switch (ch) {
      case 'a':
      case 'e':
      case 'i':
      case 'o':
      case 'u':
          {
           System.out.println("The character character is a Vowel.");
           break;
          }
         
      case '0':
      case '1':  
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
 
         {
          System.out.println("The character entered is a Number.");
          break;
         }
      case 'v':
      case 'n':
      case 't':
      case 'b':
      case 'r':
      case 'f':
          {
           System.out.println("The character entered is a Special Character.");
           break;
          }
      default:
          {
            System.out.println("The character entered is Constant.");
            break;
          }
     }
  }
}