structure
Class StackVector

java.lang.Object
  structure.AbstractStructure
      structure.AbstractLinear
          structure.AbstractStack
              structure.StackVector

All Implemented Interfaces:

Linear, Stack, Structure

public class StackVector
extends AbstractStack
implements Stack

An implementation of stacks using Vectors.

Field Summary

protected Vector

data The vector containing the stack data.

Constructor Summary

StackVector()
Construct an empty stack.

StackVector(int size)
Construct a stack with initial capacity Vector will grow if the stack fills vector.

Method Summary

void	add(java.lang.Object item) Add an element from the top of the stack.
void	clear() Remove all elements from stack.
java.lang.Object	get() Fetch a reference to the top element of the stack.
boolean	isEmpty() Returns true iff the stack is empty.
java.util.Iterator	iterator() Returns an iterator for traversing the structure.
java.lang.Object	remove() Remove an element from the top of the stack.
int	size() Determine the number of elements in stack.
java.lang.String	toString() Construct a string representation of stack.

Methods inherited from class structure.AbstractStack

getFirst, peek, pop, push

Methods inherited from class structure.AbstractLinear

empty, remove

Methods inherited from class structure.AbstractStructure

contains, elements, hashCode, values

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface structure.Stack

empty, getFirst, peek, pop, push

Methods inherited from interface structure.Structure

contains, elements, remove, values

Field Detail

data

protected Vector data

The vector containing the stack data.

Constructor Detail

StackVector

public StackVector()

Construct an empty stack.

Postcondition:

an empty stack is created

StackVector

public StackVector(int size)

Construct a stack with initial capacity Vector will grow if the stack fills vector.

Parameters:

size - The initial capacity of the vector.

Postcondition:

an empty stack with initial capacity of size is created

Method Detail

add

public void add(java.lang.Object item)

Add an element from the top of the stack.

Specified by:

add in interface Linear

Specified by:

add in interface Stack

Specified by:

add in interface Structure

Parameters:

item - The element to be added to the stack top.

See Also:

Stack.push(java.lang.Object)

Postcondition:

item is added to stack will be popped next if no intervening add

remove

public java.lang.Object remove()

Remove an element from the top of the stack.

Specified by:

remove in interface Linear

Specified by:

remove in interface Stack

Returns:

The item removed from the top of the stack.

See Also:

AbstractStack.pop()

Precondition:

stack is not empty

Postcondition:

most recently added item is removed and returned

get

public java.lang.Object get()

Fetch a reference to the top element of the stack.

Specified by:

get in interface Linear

Specified by:

get in interface Stack

Returns:

A reference to the top element of the stack.

Precondition:

stack is not empty

Postcondition:

top value (next to be popped) is returned

isEmpty

public boolean isEmpty()

Returns true iff the stack is empty. Provided for compatibility with java.util.Vector.empty.

Specified by:

isEmpty in interface Structure

Overrides:

isEmpty in class AbstractStructure

Returns:

True iff the stack is empty.

Postcondition:

returns true if and only if the stack is empty

size

public int size()

Determine the number of elements in stack.

Specified by:

size in interface Linear

Specified by:

size in interface Stack

Specified by:

size in interface Structure

Returns:

The number of elements in stack.

Postcondition:

returns the number of elements in stack

clear

public void clear()

Remove all elements from stack.

Specified by:

clear in interface Structure

Postcondition:

removes all elements from stack

iterator

public java.util.Iterator iterator()

Description copied from interface: Structure

Returns an iterator for traversing the structure.

Specified by:

iterator in interface Structure

Returns:

an iterator for traversing the structure

See Also:

AbstractIterator, Iterator, Enumeration, Structure.elements()

toString

public java.lang.String toString()

Construct a string representation of stack.

Overrides:

toString in class java.lang.Object

Returns:

A string representing the stack.

Postcondition:

returns a string representation of stack