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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

Stack()

Method Index

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

Constructors

Stack
 public Stack()

Methods

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.
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.
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.
empty
 public boolean empty()
Tests if this stack is empty.

Returns:
true if this stack is empty; false otherwise.
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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