package r4r.co.in;

import java.util.*;


public class CollectionsExample {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws NullPointerException, NoSuchElementException
	{
		// TODO Auto-generated method stub
		
		
		
		try
		{
			String string = "r4r tutorials development softwares";  // defined  a string
			System.out.println("The original string is: "+string);
			StringTokenizer st = new StringTokenizer(string);      // passed the string to the StringTokenizer constructor

			Stack<String> stck = new Stack<String>();   // created a Stack of String type elements
			while(st.hasMoreTokens())                  // loop iterates while st has more tokens to offer
			{
				stck.push(st.nextToken());            // adding the token returned by st to the stack object 
			}
			System.out.println("The reversal of the string is:");
			while(!stck.empty())        // loop iterates till stack is not empty
			System.out.print(stck.pop()+" ");   // displays the elements being popped out of stack, which is the reversal of the given string

		}
		
		catch(NullPointerException e)
		{
			e.printStackTrace();
		}
		
		catch(NoSuchElementException e)
		{
			e.printStackTrace();
		}
		
		
	}
}