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Class java.util.Stack

java.lang.Object
   |
   +----java.util.Vector
           |
           +----java.util.Stack

public class Stack

extends Vector

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.

 public Stack()

 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.

 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.

 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.

 public boolean empty()

Tests if this stack is empty.

Returns:

true if this stack is empty; false otherwise.

 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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