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Class java.util.Stack

java.lang.Object | +----java.util.Vector | +----java.util.Stack
public class Stack
extends Vector
The Stack class represents a last-in-first-out (LIFO) stack of objects.

Constructor Index

o Stack()

Method Index

o empty()
Tests if this stack is empty.
o peek()
Looks at the object at the top of this stack without removing it from the stack.
o pop()
Removes the object at the top of this stack and returns that object as the value of this function.
o push(Object)
Pushes an item onto the top of this stack.
o search(Object)
Returns where an object is on this stack.

Constructors

o Stack public Stack()

Methods

o push public Object push(Object item)
Pushes an item onto the top of this stack.

Parameters:
item - the item to be pushed onto this stack.
Returns:
the item argument.
o pop public synchronized Object pop()
Removes the object at the top of this stack and returns that object as the value of this function.

Returns:
The object at the top of this stack.
Throws: EmptyStackException
if this stack is empty.
o peek public synchronized Object peek()
Looks at the object at the top of this stack without removing it from the stack.

Returns:
the object at the top of this stack.
Throws: EmptyStackException
if this stack is empty.
o empty public boolean empty()
Tests if this stack is empty.

Returns:
true if this stack is empty; false otherwise.
o search public synchronized int search(Object o)
Returns where an object is on this stack.

Parameters:
o - the desired object.
Returns:
the distance from the top of the stack where the object is] located; the return value -1 indicates that the object is not on the stack.
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