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java.lang.Object | +--java.util.AbstractCollection | +--java.util.AbstractList | +--java.util.ArrayList | +--org.apache.commons.collections.ArrayStack
An implementation of the Stack
API that is based on an
ArrayList
instead of a Vector
, so it is not
synchronized to protect against multi-threaded access. The implementation
is therefore operates faster in environments where you do not need to
worry about multiple thread contention.
The removal order of an ArrayStack
is based on insertion
order: The most recently added element is removed first. The iteration
order is not the same as the removal order. The iterator returns
elements from the bottom up, whereas the remove()
method removes
them from the top down.
Unlike Stack
, ArrayStack
accepts null entries.
Stack
,
Serialized FormConstructor Summary | |
ArrayStack()
Constructs a new empty ArrayStack . |
|
ArrayStack(int initialSize)
Constructs a new empty ArrayStack with an initial size. |
Method Summary | |
boolean |
empty()
Return true if this stack is currently empty. |
java.lang.Object |
get()
Returns the element on the top of the stack. |
java.lang.Object |
peek()
Returns the top item off of this stack without removing it. |
java.lang.Object |
peek(int n)
Returns the n'th item down (zero-relative) from the top of this stack without removing it. |
java.lang.Object |
pop()
Pops the top item off of this stack and return it. |
java.lang.Object |
push(java.lang.Object item)
Pushes a new item onto the top of this stack. |
java.lang.Object |
remove()
Removes the element on the top of the stack. |
int |
search(java.lang.Object object)
Returns the one-based position of the distance from the top that the specified object exists on this stack, where the top-most element is considered to be at distance 1 . |
Methods inherited from class java.util.ArrayList |
add, add, addAll, addAll, clear, clone, contains, ensureCapacity, get, indexOf, isEmpty, lastIndexOf, remove, set, size, toArray, toArray, trimToSize |
Methods inherited from class java.util.AbstractList |
equals, hashCode, iterator, listIterator, listIterator, subList |
Methods inherited from class java.util.AbstractCollection |
containsAll, remove, removeAll, retainAll, toString |
Methods inherited from class java.lang.Object |
getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Collection |
add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray |
Methods inherited from interface java.util.List |
containsAll, equals, hashCode, iterator, listIterator, listIterator, remove, removeAll, retainAll, subList |
Constructor Detail |
public ArrayStack()
ArrayStack
. The initial size
is controlled by ArrayList
and is currently 10.
public ArrayStack(int initialSize)
ArrayStack
with an initial size.
initialSize
- the initial size to use
java.lang.IllegalArgumentException
- if the specified initial size
is negativeMethod Detail |
public boolean empty()
true
if this stack is currently empty.
This method exists for compatability with java.util.Stack
.
New users of this class should use isEmpty
instead.
public java.lang.Object peek() throws java.util.EmptyStackException
java.util.EmptyStackException
- if the stack is emptypublic java.lang.Object peek(int n) throws java.util.EmptyStackException
n
- the number of items down to go
java.util.EmptyStackException
- if there are not enough items on the
stack to satisfy this requestpublic java.lang.Object pop() throws java.util.EmptyStackException
java.util.EmptyStackException
- if the stack is emptypublic java.lang.Object push(java.lang.Object item)
add
.
item
- the item to be added
public int search(java.lang.Object object)
1
. If the object is not
present on the stack, return -1
instead. The
equals()
method is used to compare to the items
in this stack.
object
- the object to be searched for
public java.lang.Object get()
get
in interface Buffer
BufferUnderflowException
- if the stack is emptypublic java.lang.Object remove()
remove
in interface Buffer
BufferUnderflowException
- if the stack is empty
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