Java.util.Stack Class


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Introduction

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
1

Stack()

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


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