Strange EIMACS exercise

ListQueue.java

public class ListQueue extends LinkedList<Object>
{
  // write your code here
}
 
public class MainClass
{
  public static void main( String[] args )
  {
    LinkedList<Object> q = new ListQueue();
 
    // < methods testing #add, #isEmpty(), #peek(), #pop(), and #remove() >
  }
}