Stack

import java.util.Iterator;
import java.util.Stack;
public class Main{
    public static void main(String args[]){
        Stack s = new Stack();
        for(int i=5;i>=0;i--) s.push(i);
        System.out.println(s.size());
        System.out.println(s.isEmpty());
        Iterator it = s.iterator();
        
        //By Iterating
        while(it.hasNext()){
            System.out.println(it.next());
        }

        //By LIFO
        while(s.empty()!=true){
            System.out.println(s.peek());
            s.pop();
        }
    }
}