/**
 * @(#)NestedExceptionTest.java
 *
 * NestedExceptionTest application
 *
 * @author 
 * @version 1.00 2011/1/10
 */
 
 import jdg.ch05.KeyboardInput;
 import java.lang.System;
 import java.lang.Exception;
 import java.io.IOException;
 
 class VowelException extends Exception{}
 class ConstantException extends Exception{}
 class BlankException extends Exception{}
 class ExitException extends Exception{}
 
  
class NestedExceptionTest {
    static KeyboardInput kbd= new KeyboardInput(System.in);
    
    public static void main(String args[]) {        
    	do{
    		try{
    			processUserInput();
    		}catch(IOException x){
    			System.out.println("Not acceptable.Try again.\n");
    		}catch(Exception x){
    			System.out.println(x);
    			}
    	
    	}while(!exitExceptionTest());
    }
    	
    	
    	static boolean exitExceptionTest(){
    		try{
    			System.out.println("Exit(y/n): ");
    			System.out.flush();
    			char ch=Character.toUpperCase(kbd.getChar());
    			
    			if(ch=='Y') return true;
    			else return false;
    		}catch(IOException iox){
    			return false;
    			
    		}
    	}
    	static void processUserInput() throws ExitException, Exception{
    		System.out.print("Enter a character: ");
    		System.out.flush();
    		char ch;
    	}
    	
    	try{
    		ch=Character.toUpperCase(kbd.getChar());
    		
    	}catch(IOException x){
    		System.out.println("An IOException occured.");
    		return;
    	}
    	switch(ch){
    		case 'A':
    		case 'E':
    		case 'I':
    		case 'O':		
    		case 'U':
    			throw new Exception("You enter a vowel");
    			
    			case '1':
    				throw new Exception("You enter a number");
    			case 'X': 
    				throw	new ExitException();
    			default:
    				throw new Exception("You enter an invalid Value");	
    	}
   	
    	
    }
}