stackadt.java

一个普通的计算器程序

//********************************************************************
//  StackADT.java       Authors: Lewis/Chase
//
//  Defines the interface to a stack data structure.
//********************************************************************
package jss2;

public interface StackADT<T>
{
   /**  Adds one element to the top of this stack */
   public void push (T element);

   /**  Removes and returns the top element from this stack */
   public T pop();

   /**  Returns without removing the top element of this stack */
   public T peek();
   
   /**  Returns true if this stack contains no elements */
   public boolean isEmpty();

   /**  Returns the number of elements in this stack */
   public int size();

   /**  Returns a string representation of this stack */
   public String toString();
}