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Java Source Code / Java Documentation » 6.0 JDK Core » Collections Jar Zip Logging regex » java.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.util .Stack

Stack

public class Stack extends Vector (Code)

The Stack class represents a last-in-first-out (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.

A more complete and consistent set of LIFO stack operations is provided by the Deque interface and its implementations, which should be used in preference to this class. For example:

   
 Deque stack = new ArrayDeque();

author:
   Jonathan Payne
version:
   1.36, 05/05/07
since:
   JDK1.0

Constructor Summary
public	Stack() Creates an empty Stack.

Method Summary
public boolean	empty() Tests if this stack is empty.
public synchronized E	peek() Looks at the object at the top of this stack without removing it from the stack.
public synchronized E	pop() Removes the object at the top of this stack and returns that object as the value of this function.
public E	push(E item) Pushes an item onto the top of this stack.
public synchronized int	search(Object o) Returns the 1-based 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`.

Constructor Detail

Stack
public Stack()(Code)
	Creates an empty Stack.

Method Detail

empty
public boolean empty()(Code)
	Tests if this stack is empty. `true` if and only if this stack containsno items; `false` otherwise.

peek
public synchronized E peek()(Code)
	Looks at the object at the top of this stack without removing it from the stack. the object at the top of this stack (the last itemof the `Vector` object). exception: EmptyStackException - if this stack is empty.

pop
public synchronized E pop()(Code)
	Removes the object at the top of this stack and returns that object as the value of this function. The object at the top of this stack (the last itemof the `Vector` object). exception: EmptyStackException - if this stack is empty.

push
public E push(E item)(Code)
	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. the `item` argument. See Also: java.util.Vector.addElement

search
public synchronized int search(Object o)(Code)
	Returns the 1-based 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. the 1-based position from the top of the stack wherethe object is located; the return value `-1`indicates that the object is not on the stack.

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