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java.lang.Objectjava.util.Vector<E>
java.util.Stack<E>
@TransactionType(value=SUPPORTS) public class Stack<E>
The Stack class represents a last-in-first-out (LIFO) stack of
objects. It extends class Vector with five operations that allow a
vector to be treated as a stack. The usual push and pop
operations are provided, as well as a method to peek at the top
item on the stack, a method to test for whether the stack is empty,
and a method to search the stack for an item and discover how far
it is from the top.
When a stack is first created, it contains no items.
This class is thread-safe (synchronzied).
| Field Summary |
|---|
| Fields inherited from class java.util.Vector |
|---|
capacityIncrement, elementCount, elementData, modCount |
| Constructor Summary | |
|---|---|
Stack()
Creates an empty Stack. |
|
| Method Summary | |
|---|---|
boolean |
empty()
Tests if this stack is empty. |
E |
peek()
Looks at the object at the top of this stack without removing it from the stack. |
E |
pop()
Removes the object at the top of this stack and returns that object as the value of this function. |
E |
push(E item)
Pushes an item onto the top of this stack. |
int |
search(Object o)
Returns the 1-based position where an object is on this stack. |
| Methods inherited from class java.util.Vector |
|---|
addElement, capacity, contains, copyInto, elementAt, elements, ensureCapacity, equals, firstElement, hashCode, indexOf, indexOf, insertElementAt, isEmpty, iterator, lastElement, lastIndexOf, lastIndexOf, removeAllElements, removeElement, removeElementAt, setElementAt, setSize, size, toString, trimToSize |
| Methods inherited from class java.lang.Object |
|---|
getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public Stack()
| Method Detail |
|---|
public E push(E item)
addElement(item)
item - the item to be pushed onto this stack.
item argument.Vector.addElement(E)public E pop()
EmptyStackException - if this stack is empty.public E peek()
EmptyStackException - if this stack is empty.public boolean empty()
true if and only if this stack contains no items;
false otherwise.public int search(Object o)
o - the desired object.
-1 indicates that the
object is not on the stack.
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