com.marringtons.string
Class StringStack

java.lang.Object
  com.marringtons.string.StringStack

public class StringStack

extends Object

This class implement a stack with String keys and values.

 stack = new StringStack();
 stack.push( "one");
 stack.isEmpty() == false;
 stack.size() == 1;
 stack.push( "two");
 stack.peek().equals( "two");
 stack.pop().equals( "two");
 stack.peek().equals( "one");
 stack.clear();
 stack.isEmpty() == true;
 

Author:

Paul Marrington

Constructor Summary

StringStack()

Method Summary

void	clear() Empty stack - releasing all references.
boolean	isEmpty() Return true only if the stack is devoid of items.
String	peek() Return the string on the top of the stack (without changint the stack pointer).
String	pop() Pop a string from the stack.
void	push(Object item) Push a string onto the stack (enlarging it if necessary).
int	size() Return the number of items currently on the stack.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StringStack

public StringStack()

Method Detail

push

public void push(Object item)

Push a string onto the stack (enlarging it if necessary).

Parameters:

item - to push

pop

public String pop()

Pop a string from the stack.

Returns:

most recently added item or null if stack is empty

peek

public String peek()

Return the string on the top of the stack (without changint the stack pointer).

Returns:

most recently added item or null if stack is empty

size

public int size()

Return the number of items currently on the stack.

Returns:

the number if items on the stack.

isEmpty

public boolean isEmpty()

Return true only if the stack is devoid of items.

Returns:

true if the stack is empty.

clear

public void clear()

Empty stack - releasing all references.