Chapter 24 Exercise 5, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

24.5 (Implement GenericQueue using inheritance) In Section  24.5, Stacks and
Queues, GenericQueue is implemented using composition. Define a new queue
class that extends java.util.LinkedList.

public class Exercise05 {
 public static void main(String[] args) {
  // Create a queue
  GenericQueue<String> queue = new GenericQueue<String>();

  // Add elements to the queue
  queue.enqueue("Tom"); // Add it to the queue
  System.out.println("(7) " + queue);

  queue.enqueue("Susan"); // Add it to the queue
  System.out.println("(8) " + queue);

  queue.enqueue("Kim"); // Add it to the queue
  queue.enqueue("Michael"); // Add it to the queue
  System.out.println("(9) " + queue);

  // Remove elements from the queue
  System.out.println("(10) " + queue.dequeue());
  System.out.println("(11) " + queue.dequeue());
  System.out.println("(12) " + queue);
 }

 static class GenericQueue<E> extends java.util.LinkedList<E> {
  private static final long serialVersionUID = 1L;

  public void enqueue(E e) {
   addLast(e);
  }

  public E dequeue() {
   return removeFirst();
  }

  public int getSize() {
   return size();
  }

  @Override
  public String toString() {
   return "Queue: " + super.toString();
  }
 }
}