DataStructures
Interface Stack

All Known Implementing Classes:

StackArray, StackList

public interface Stack

A last-in-first-out (LIFO) stack of objects.

Author:

Peter Williams

Method Summary

boolean	isEmpty() Indicates the status of the stack.
java.lang.Object	pop() Pops an item off the stack.
void	push(java.lang.Object item) Pushes an item onto the stack.

Method Detail

isEmpty

public boolean isEmpty()

Indicates the status of the stack.

Returns:

true if the stack is empty.

push

public void push(java.lang.Object item)

Pushes an item onto the stack.

Parameters:

item - the Object to be pushed.

pop

public java.lang.Object pop()

Pops an item off the stack.

Returns:

the item most recently pushed onto the stack

Throws:

NoSuchElementException - if the stack is empty.