Java.util.Stack Class



The java.util.Stack class represents a last-in-first-out (LIFO) stack of objects.

  • When a stack is first created, it contains no items.

  • In this class, the last element inserted is accessed first.

Class declaration

Following is the declaration for java.util.Stack class:

public class Stack<E>
    extends Vector<E>

Class constructors

S.N.Constructor & Description
This constructor creates an empty stack.

Class methods

S.N.Method & Description
1 boolean empty()
This method tests if this stack is empty.
2 E peek()
This method looks at the object at the top of this stack without removing it from the stack.
3 E pop()
This method removes the object at the top of this stack and returns that object as the value of this function.
4 E push(E item)
This method pushes an item onto the top of this stack.
5 int search(Object o)
This method returns the 1-based position where an object is on this stack.

Methods inherited

This class inherits methods from the following classes:

  • java.util.Vector

  • java.util.AbstractList

  • java.util.Object

  • java.util.List