Interface Stack

public interface Stack

Provides a LIFO (last-in-first-out) storage.

Author:

Christian Liebchen

Method Summary
boolean	isEmpty()           Tells whether this stack contains an object.
Object	pop()           Provides the top-object of this stack and removes it from the stack.
void	push(Object o)           Adds a new object at the top of this stack.
Object	top()           Provides the top-object of this stack without removing it.

 

Method Detail

isEmpty

public boolean isEmpty()

Tells whether this stack contains an object.

Returns:

true, iff this stack does not contain any object

push

public void push(Object o)

Adds a new object at the top of this stack.

Parameters:

o - the object to be stored in this stack

top

public Object top()
           throws EmptyStackException

Provides the top-object of this stack without removing it.

Returns:

the top object in this stack

Throws:

EmptyStackException - if isEmpty()

pop

public Object pop()
           throws EmptyStackException

Provides the top-object of this stack and removes it from the stack.

Returns:

the top object in this stack

Throws:

EmptyStackException - if isEmpty()