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Showing content from https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/Stack.html below:

Stack (Java SE 20 & JDK 20)

Type Parameters:

E - Type of component elements

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, List<E>, RandomAccess

The

class represents a last-in-first-out (LIFO) stack of objects. It extends class

with five operations that allow a vector to be treated as a stack. The usual

and

operations are provided, as well as a method to

at the top item on the stack, a method to test for whether the stack is

, and a method to

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<Integer> stack = new ArrayDeque<Integer>();

Since:

1.0

See Also:

• Serialized Form

• Field Summary
• Constructor Summary

  Constructors

• Method Summary

  boolean

  Tests if this stack is empty.

  Looks at the object at the top of this stack without removing it from the stack.

  Removes the object at the top of this stack and returns that object as the value of this function.

  Pushes an item onto the top of this stack.

  int

  Returns the 1-based position where an object is on this stack.

  Methods declared in class java.util.Vectoradd, add, addAll, addAll, addElement, capacity, clear, clone, contains, containsAll, copyInto, elementAt, elements, ensureCapacity, equals, firstElement, forEach, get, hashCode, indexOf, indexOf, insertElementAt, isEmpty, iterator, lastElement, lastIndexOf, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, removeAllElements, removeElement, removeElementAt, removeIf, removeRange, replaceAll, retainAll, set, setElementAt, setSize, size, spliterator, subList, toArray, toArray, toString, trimToSize Methods declared in interface java.util.Listsort

• Constructor Details
  • Stack

    public Stack()

    Creates an empty Stack.

• Method Details
  • push

    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:

    • Vector.addElement(E)

  • 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

    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

    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.

    Returns:

    the 1-based 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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