Stack Class - Simplified Learning

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;
/**
 * 
 * @author ashok.mariyala
 *
 */
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
   }
}

Stack Class