// Fig. 14.9: UsingExceptions.java
// Demonstration of the try-catch-finally 
// exception handling mechanism.
public class UsingExceptions {

   // execute application
   public static void main( String args[] )
   {
      // call method throwException
      try {
         throwException();
      }

      // catch Exceptions thrown by method throwException
      catch ( Exception exception )
      {
         System.err.println( "Exception handled in main" );
      }

      doesNotThrowException();
   }

   // demonstrate try/catch/finally
   public static void throwException() throws Exception
   {
      // throw an exception and immediately catch it
      try {
         System.out.println( "Method throwException" );
         throw new Exception();  // generate exception
      }

      // catch exception thrown in try block
      catch ( Exception exception )
      {
         System.err.println(
            "Exception handled in method throwException" );
         throw exception;  // rethrow for further processing

         // any code here would not be reached
      }

      // this block executes regardless of what occurs in 
      // try/catch
      finally {
         System.err.println( 
            "Finally executed in throwException" );
      }

      // any code here would not be reached
   }

   // demonstrate finally when no exception occurs
   public static void doesNotThrowException()
   {
      // try block does not throw an exception
      try {
         System.out.println( "Method doesNotThrowException" );
      }

      // catch does not execute, because no exception thrown
      catch( Exception exception )
      {
         System.err.println( exception.toString() );
      }

      // this block executes regardless of what occurs in 
      // try/catch
      finally {
         System.err.println(
            "Finally executed in doesNotThrowException" );
      }

      System.out.println( 
         "End of method doesNotThrowException" );
   }

}  // end class UsingExceptions


/**************************************************************************
 * (C) Copyright 2002 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
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