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public class java.util.Stack
(source file: Stack.java)
java.lang.Object

+java.util.AbstractCollection<A>

+java.util.AbstractList<A>

+java.util.Vector

+java.util.Stack
The pure class interface.
public class Stack
extends Vector

The
Stack
class represents a lastinfirstout
(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.
 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
 push(Object)

Pushes an item onto the top of this stack
 search(Object)

Returns the 1based position 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. This has exactly
the same effect as:
addElement(item)
 Parameters:
 item  the item to be pushed onto this stack.
 Returns:
 the
item
argument.
 See also:
 addElement
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 (the last item
of the Vector object).
 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 (the last item
of the Vector object).
 Throws:
 EmptyStackException  if this stack is empty.

empty
public boolean empty();

Tests if this stack is empty.
 Returns:
true
if and only if this stack contains
no items; false
otherwise.
search
public synchronized int search(Object o);

Returns the 1based position where an object is on this stack.
If the object o occurs as an item in this stack, this
method returns the distance from the top of the stack of the
occurrence nearest the top of the stack; the topmost item on the
stack is considered to be at distance 1. The equals
method is used to compare o to the
items in this stack.
 Parameters:
 o  the desired object.
 Returns:
 the 1based position 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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