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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.
Stack ()
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.
Stack
public Stack()
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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