Package java.util

Class Stack<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

java.util.Vector<E>

java.util.Stack<E>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, List<E>, RandomAccess

public class Stack<E>
extends Vector<E>

Stack is a Last-In/First-Out(LIFO) data structure which represents a stack of objects. It enables users to pop to and push from the stack, including null objects. There is no limit to the size of the stack.

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.Vector

capacityIncrement, elementCount, elementData

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
Stack()	Constructs a stack with the default size of Vector.

Method Summary

Modifier and Type	Method	Description
boolean	empty()	Returns whether the stack is empty or not.
E	peek()	Returns the element at the top of the stack without removing it.
E	pop()	Returns the element at the top of the stack and removes it.
E	push(E object)	Pushes the specified object onto the top of the stack.
int	search(Object o)	Returns the index of the first occurrence of the object, starting from the top of the stack.

Methods inherited from class java.util.Vector

add, add, addAll, addAll, addElement, capacity, clear, clone, contains, containsAll, copyInto, elementAt, elements, ensureCapacity, equals, firstElement, get, hashCode, indexOf, indexOf, insertElementAt, isEmpty, lastElement, lastIndexOf, lastIndexOf, remove, remove, removeAll, removeAllElements, removeElement, removeElementAt, removeRange, retainAll, set, setElementAt, setSize, size, subList, toArray, toArray, toString, trimToSize

Methods inherited from class java.util.AbstractList

iterator, listIterator, listIterator

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.List

iterator, listIterator, listIterator

Constructor Details

Stack

public Stack()

Constructs a stack with the default size of Vector.

Method Details

empty

public boolean empty()

Returns whether the stack is empty or not.

Returns:

true if the stack is empty, false otherwise.

peek

public E peek()

Returns the element at the top of the stack without removing it.

Returns:

the element at the top of the stack.

Throws:

EmptyStackException - if the stack is empty.

See Also:

pop()

pop

public E pop()

Returns the element at the top of the stack and removes it.

Returns:

the element at the top of the stack.

Throws:

EmptyStackException - if the stack is empty.

See Also:

peek(), push(E)

push

public E push(E object)

Pushes the specified object onto the top of the stack.

Parameters:

object - The object to be added on top of the stack.

Returns:

the object argument.

See Also:

peek(), pop()

search

public int search(Object o)

Returns the index of the first occurrence of the object, starting from the top of the stack.

Parameters:

o - the object to be searched.

Returns:

the index of the first occurrence of the object, assuming that the topmost object on the stack has a distance of one.