public class Stack<E> extends Vector<E>
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<Integer> stack = new ArrayDeque<Integer>();
capacityIncrement, elementCount, elementData modCount public Stack()
Creates an empty Stack.
public E push(E item)
Pushes an item onto the top of this stack. This has exactly the same effect as:
addElement(item)
item - the item to be pushed onto this stack.item argument.Vector.addElement(E)public E pop()
Removes the object at the top of this stack and returns that object as the value of this function.
Vector object).EmptyStackException - if this stack is empty.public E peek()
Looks at the object at the top of this stack without removing it from the stack.
Vector object).EmptyStackException - if this stack is empty.public boolean empty()
Tests if this stack is empty.
true if and only if this stack contains no items; false otherwise.public 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. The equals method is used to compare o to the items in this stack.
o - the desired object.-1 indicates that the object is not on the stack.
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