import java.util.ArrayList; import java.util.LinkedList; import java.util.Queue; public class QueueExmaple { public static void main(String[] args) { Queue<String> queue= new LinkedList<>(); // Linked list implements que interface queue.add("one"); queue.add("two"); System.out.println(queue.peek());// Returns head. if head is not present then returns null
System.out.println(queue.poll()); // Returns and Removes head
System.out.println(queue.poll()); // Returns and Removes head
System.out.println(queue.peek()); // Returns head. if head is not present then returns null
System.out.println(queue.element()); // Returns head.
If head is not present then throws NoSuchElementException } }