structure
Class StackVector<ELTTYPE>

java.lang.Object
  structure.AbstractStructure<ELTTYPE>
      structure.AbstractLinear<ELTTYPE>
          structure.AbstractStack<ELTTYPE>
              structure.StackVector<ELTTYPE>

All Implemented Interfaces:

java.lang.Iterable<ELTTYPE>, Linear<ELTTYPE>, Stack<ELTTYPE>, Structure<ELTTYPE>

public class StackVector<ELTTYPE>
extends AbstractStack<ELTTYPE>
implements Stack<ELTTYPE>

An implementation of a stack, based on extensible arrays. The head of the stack is stored in the first position of the list, allowing the stack to grow and shrink in constant time. This stack implementation is ideal for applications that require a dynamically resizable stack which occasionally takes a time proportional to the its length to expand.

Example usage:

To reverse a string with a stack array, we would use the following:

 public static void main(String[] arguments)
 {
     if(arguments.length > 0){
           StackVector reverseStack = new StackVector();
           String s = arguments[0];
            
           for(int i=0; i < s.length(); i++){
               reverseStack.push(new Character(s.charAt(i)));
           }

           while(!reverseStack.AbstractLinear.empty()){
               System.out.print(reverseStack.AbstractStack.pop());
           }

           System.out.println();
     }
 }
 

See Also:

Stack, StackList, StackArray, AbstractStack

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(ELTTYPE item) Add an element from the top of the stack.
void	clear() Remove all elements from stack.
ELTTYPE	get() Fetch a reference to the top element of the stack.
boolean	isEmpty() Returns true iff the stack is empty.
java.util.Iterator<ELTTYPE>	iterator() Returns an iterator for traversing the structure.
ELTTYPE	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

equals, 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

Constructor Detail

StackVector

public StackVector()

Construct an empty stack.

Post:

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.

Post:

an empty stack with initial capacity of size is created

Method Detail

add

public void add(ELTTYPE item)

Add an element from the top of the stack.

Specified by:

add in interface Linear<ELTTYPE>

Specified by:

add in interface Stack<ELTTYPE>

Specified by:

add in interface Structure<ELTTYPE>

Parameters:

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

See Also:

Stack.push(ELTTYPE)

Post:

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

remove

public ELTTYPE remove()

Remove an element from the top of the stack.

Specified by:

remove in interface Linear<ELTTYPE>

Specified by:

remove in interface Stack<ELTTYPE>

Returns:

The item removed from the top of the stack.

See Also:

AbstractStack.pop()

Pre:

stack is not empty

Post:

most recently added item is removed and returned

get

public ELTTYPE get()

Fetch a reference to the top element of the stack.

Specified by:

get in interface Linear<ELTTYPE>

Specified by:

get in interface Stack<ELTTYPE>

Returns:

A reference to the top element of the stack.

Pre:

stack is not empty

Post:

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<ELTTYPE>

Overrides:

isEmpty in class AbstractStructure<ELTTYPE>

Returns:

True iff the stack is empty.

Post:

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<ELTTYPE>

Specified by:

size in interface Stack<ELTTYPE>

Specified by:

size in interface Structure<ELTTYPE>

Returns:

The number of elements in stack.

Post:

returns the number of elements in stack

clear

public void clear()

Remove all elements from stack.

Specified by:

clear in interface Structure<ELTTYPE>

Post:

removes all elements from stack

iterator

public java.util.Iterator<ELTTYPE> iterator()

Description copied from interface: Structure

Returns an iterator for traversing the structure.

Specified by:

iterator in interface java.lang.Iterable<ELTTYPE>

Specified by:

iterator in interface Structure<ELTTYPE>

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.

Post:

returns a string representation of stack