// Fig. 21.10: StackTest2.java
// Passing generic Stack objects to generic methods.
public class StackTest2 
{
   public static void main( String[] args ) 
   {
      Double[] doubleElements = { 1.1, 2.2, 3.3, 4.4, 5.5 };
      Integer[] integerElements = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
      
      // Create a Stack< Double > and a Stack< Integer >
      Stack< Double > doubleStack = new Stack< Double >( 5 ); 
      Stack< Integer > integerStack = new Stack< Integer >(); 

      // push elements of doubleElements onto doubleStack
      testPush( "doubleStack", doubleStack, doubleElements );
      testPop( "doubleStack", doubleStack ); // pop from doubleStack

      // push elements of integerElements onto integerStack
      testPush( "integerStack", integerStack, integerElements );
      testPop( "integerStack", integerStack ); // pop from integerStack
   } // end main

   // generic method testPush pushes elements onto a Stack
   public static < T > void testPush( String name , Stack< T > stack, 
      T[] elements )
   {
      System.out.printf( "\nPushing elements onto %s\n", name );

      // push elements onto Stack
      for ( T element : elements )
      {
         System.out.printf( "%s ", element );
         stack.push( element ); // push element onto stack
      } // end for
   } // end method testPush

   // generic method testPop pops elements from a Stack
   public static < T > void testPop( String name, Stack< T > stack )
   {
      // pop elements from stack
      try
      {
         System.out.printf( "\nPopping elements from %s\n", name );
         T popValue; // store element removed from stack

         // remove all elements from Stack
         while ( true )
         {
            popValue = stack.pop(); // pop from stack
            System.out.printf( "%s ", popValue );
         } // end while
      } // end try
      catch( EmptyStackException emptyStackException )
      {
         System.out.println();
         emptyStackException.printStackTrace();
      } // end catch EmptyStackException
   } // end method testPop
} // end class StackTest2

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