e.getMessage()

[arefeh]

class TemperatureException extends Exception 
{
}

class TooColdException extends TemperatureException 
{
}

class TooHotException extends TemperatureException 
{
}

[b]class UnusualTasteException extends Exception 
{
	UnusualTasteException() 
  {
  }
  UnusualTasteException(String msg) 
  {
  	super(msg);
  }
}[/b]

class VirtualPerson 
{
    public void drinkCoffee(CoffeeCup cup) throws TooColdException,
        TemperatureException, UnusualTasteException 
        {
        	try 
        	{
        		int i = (int) (Math.random() * 4.0);
            switch (i) 
            {
            	case 0:
                throw new TooHotException();

              case 1:
                throw new TooColdException();

              case 2:
                throw new UnusualTasteException();

              default:
                throw new TemperatureException();
            }
          }
        catch (TooHotException e) 
        {
        	System.out.println("This coffee is too hot.");
        }
    }
    //...
}


class VirtualCafe 
{
	public static void serveCustomer(VirtualPerson cust,
        CoffeeCup cup)throws TemperatureException,
        UnusualTasteException 
        {
        	try 
        	{
        		cust.drinkCoffee(cup);
          }
          catch (UnusualTasteException e) 
          {
          	System.out.println(
                "Customer is complaining of an unusual taste.");   
            [b]String s = e.getMessage(); 
            if (s != null) 
            {
            	System.out.println(s);
            }[/b]
            // Deal with an unhappy customer...
          }

        }
}

class Example2 
{
	public static void main(String[] args)
        throws TemperatureException  
        {
        	// Create a new coffee cup.
          CoffeeCup cup = new CoffeeCup();

          // Create and serve a virtual customer.
          try 
          {
          	VirtualPerson cust = new VirtualPerson();
            VirtualCafe.serveCustomer(cust, cup);
          }
          catch (UnusualTasteException e) 
          {
            System.out.println("This coffee has an unusual taste.");
          }
        }
}

Hello
Question: How can I use from String s = e.getMessage(); in this program?
And how can I place following codes in this program?

1.	new UnusualTasteException() 
2.	new UnusualTasteException("This coffee tastes like tea.")

[arefeh]

I found the answer of my question:
I should wrote:
case 2:
throw new UnusualTasteException("This coffee tastes like tea.");
in this program.