import java.util.Stack<E>;
Stack<Integer> myStack = new Stack<Integer>();
myStack.push(1);
myStack.pop();
myStack.peek();
myStack.empty(); // True if stack is empty

import java.util.*;
public class Main { public static void main(String[] args) { Queue<Integer> q1 = new LinkedList<Integer>(); //Add elements to the Queue q1.add(10); q1.add(20); q1.add(30); q1.add(40); q1.add(50); System.out.println("Elements in Queue:"+q1); //remove () method =>removes first element from the queue System.out.println("Element removed from the queue: "+q1.remove()); //element() => returns head of the queue System.out.println("Head of the queue: "+q1.element()); //poll () => removes and returns the head System.out.println("Poll():Returned Head of the queue: "+q1.poll()); //returns head of the queue System.out.println("peek():Head of the queue: "+q1.peek()); //print the contents of the Queue System.out.println("Final Queue:"+q1); }
}