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Interface DataStructures.Stack

public interface Stack
Protocol for stacks.

Method Index

o isEmpty()
Test if the stack is logically empty.
o makeEmpty()
Make the stack logically empty.
o pop()
Remove the most recently inserted item from the stack.
o push(Object)
Insert a new item into the stack.
o top()
Get the most recently inserted item in the stack.
o topAndPop()
Return and remove the most recently inserted item from the stack.

Methods

o isEmpty 
public abstract boolean isEmpty()
Test if the stack is logically empty.

Returns:
true if empty, false otherwise.
o top 
public abstract Object top() throws Underflow
Get the most recently inserted item in the stack. Does not alter the stack.

Returns:
the most recently inserted item in the stack.
Throws: Underflow
if the stack is empty.
o pop 
public abstract void pop() throws Underflow
Remove the most recently inserted item from the stack.

Throws: Underflow
if the stack is empty.
o topAndPop 
public abstract Object topAndPop() throws Underflow
Return and remove the most recently inserted item from the stack.

Returns:
the most recently inserted item in the stack.
Throws: Underflow
if the stack is empty.
o push 
public abstract void push(Object x)
Insert a new item into the stack.

Parameters:
x - the item to insert.
o makeEmpty 
public abstract void makeEmpty()
Make the stack logically empty. 

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