// Fig. 20.12: StackComposition.java
// Class StackComposition definition with composed List object.
package com.deitel.jhtp5.ch20;

public class StackComposition {
   private List stackList;

   // construct stack
   public StackComposition() 
   { 
      stackList = new List( "stack" ); 
   }

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

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

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

   // output stack contents
   public synchronized void print() 
   { 
      stackList.print(); 
   }

} // end class StackComposition


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