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package com.modulus.common.collections;
/**
* Class defines a better used stack than what is
* in the java api. This stack is an interface
* with many different implementations.
*
* @author jrahm
*
* @param <T> the type this stack stores
*/
public interface Stack<T> {
/**
* Removes and returns the element that is on
* the top of the stack.
*
* @return the element which is on the top of the stack.
*/
public T pop();
/**
* Places object <code>obj</code> on the top of
* the stack
*
* @param obj the object to push on the stack.
*/
public void push(T obj);
/**
* Returns the object on the top of the stack
* but does <b>not</b> remove it.
*
* @return the object on the top of the stack
*/
public T peek();
/**
* Returns the number of elements in this
* stack.
*
* @return the number of elements in this stack.
*/
public int size();
/**
* Returns true of this stack has no elements,
* returns false otherwise.
*
* @return true it this stack has no elements, false otherwise
*/
public boolean isEmpty();
/**
* Empties the stack.
*/
public void clear();
}
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