// Fig. 17.12: StackComposition.java
// Class StackComposition definition with composed List object.
package com.deitel.jhtp6.ch17;

public class StackComposition 
{
   private List stackList;

   // no-argument constructor
   public StackComposition() 
   { 
      stackList = new List( "stack" ); 
   } // end StackComposition no-argument constructor

   // add object to stack
   public void push( Object object )
   { 
      stackList.insertAtFront( object ); 
   } // end method push

   // remove object from stack
   public Object pop() throws EmptyListException
   { 
      return stackList.removeFromFront(); 
   } // end method pop

   // determine if stack is empty
   public boolean isEmpty() 
   { 
      return stackList.isEmpty(); 
   } // end method isEmpty

   // output stack contents
   public void print() 
   { 
      stackList.print(); 
   } // end method print
} // end class StackComposition


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