Stack Class

Stack

• It is the child class of Vector.
• Whenever last in first out(LIFO) order required then we should go for Stack.

Constructors

Stack class contains one and only one constructor.

Stack s= new Stack();

Methods in Stack

1. Object push(Object o);

To insert an object into the stack.

2. Object pop();

To remove and return top of the stack.

3. Object peek();

To return top of the stack without removal.

4. boolean empty();

Returns true if Stack is empty.

5. int search(Object o);

Returns offset if the element is available otherwise returns “-1”

package com.ashok.collections;

import java.util.Stack;

public class MyStack {
   public static void main(String[] args) {
      Stack stack = new Stack();
      stack.push("Ashok");
      stack.push("Vinod");
      stack.push("Naresh");
      
   System.out.println(stack);// [Ashok, Vinod, Naresh]
      System.out.println(stack.pop());// Naresh
      System.out.println(stack);// [Ashok, Vinod]
      System.out.println(stack.peek());// Vinod
      System.out.println(stack.search("Ashok"));// 2
      System.out.println(stack.search("Dillesh"));// -1
      System.out.println(stack.empty());// false
   }
}