// Create a queue class using the MyList class
// Since a queue does not allow insertions anywhere but the end and removals anywhere but the beginning, we have to 
//    override several methods to "disallow" them, and also add methods to insert (always at the end) and remove (always at the beginning)

import java.util.*;

public class MyQueue extends MyList
{
	public MyQueue()
	{
		alist = new ArrayList<String>();
	}
	
	@Override 
	public void insertAtFront(String a)
	{
		System.out.println("Illegal operation, queues do not permit insertions at the front");
	}

	@Override	
	public void insert(int i, String a)
	{
		System.out.println("Illegal operation, queues do not permit insertions anywhere but at the end");
	}

	@Override
	public String removeFromEnd()
	{
		System.out.println("Illegal operation, queues do not permit removal from the end");
		return null;
	}
	
	@Override
	public String remove(int i)
	{
		System.out.println("Illegal operation, queues do not permit removal anywhere but at the front");
		return null;
	}
	
	public void insert(String a)
	{
		super.insertAtEnd(a);
	}
	
	public String remove()
	{
		return super.removeFromFront();
	}
}