java.util.EmptyStackException - Stack is empty or not in Java in Java

In this Program we are going to do check Stack is empty or not in Java.

     

Error Message:

Testing for empty stack

28 milliseconds

Catching EmptyStackException

Exception in thread "main" java.util.EmptyStackException

       at java.util.Stack.peek(Stack.java:102)

       at java.util.Stack.pop(Stack.java:84)

       at com.lib.EmptyStackException.main(EmptyStackException.java:24)

Error Description:

In below program without checking the stack has elements or not we are going to pop the element,so we got an error.

package com.lib;

import java.util.Date;

import java.util.Stack;

public class EmptyStackException

{

       public static void main(String[] args)

       {

              int count = 1000000;

             Stack s = new Stack();

             System.out.println("Testing for empty stack");

             long s1 = System.currentTimeMillis();

             for (int i = 0; i <= count; i++)

            

             if (!s.empty())s.pop();

             long s2 = System.currentTimeMillis();

             System.out.println((s2 - s1) + " milliseconds");

             System.out.println("Catching EmptyStackException");

             s1 = System.currentTimeMillis();

            

             for (int i = 0; i <= count; i++)

             {

                     s.pop();

             }

             s2 = System.currentTimeMillis();

             System.out.println((s2 - s1) + " milliseconds");

             

       }

}

Error Solution:

package com.lib;

import java.util.Date;

import java.util.Stack;

public class EmptyStackException

{

       public static void main(String[] args)

       {

              int count = 1000000;

             Stack s = new Stack();

             System.out.println("Testing for empty stack");

             long s1 = System.currentTimeMillis();

             for (int i = 0; i <= count; i++)

            

             if (!s.empty())s.pop();

             long s2 = System.currentTimeMillis();

             System.out.println((s2 - s1) + " milliseconds");

             System.out.println("Catching EmptyStackException");

             s1 = System.currentTimeMillis();

            

             for (int i = 0; i <= count; i++)

             {

                if(!s.isEmpty())

                {

                   s.pop();

                }

             }

                

             s2 = System.currentTimeMillis();

             System.out.println((s2 - s1) + " milliseconds");

             

       }

}

Output:

Testing for empty stack

25 milliseconds

Catching EmptyStackException

15 milliseconds