抛出异常类Java

Question

I am coding a circular singly linked list

public class CircularSLList<T>
{

    protected class SLNode<T>
    {
        public T info = null;
        public SLNode<T> next = null;
    }

    public SLNode<T> tail = null;
    protected int size = 0;

I'm trying to throw a user defined exception class

public class EmptyListException extends RuntimeException
{
    public EmptyListException()
    {
        super();
    }
}

But i keep on getting an "EmptyListException can not be resolved error"

Here is my code

   public T removeFromHead() throws EmptyListException
    {
        if(tail == null)
        {
            throw new EmptyListException() ;
            return null ;
        }

        else
        {
            tail.next = tail.next.next ;
            tail.next.next = null ;
        }
        return null;
    }

All my files are in the same folder and all variable names have been spelled correctly so I cannot figure out why I'm getting this error

Thanks

Answer 1

You have no defined package, so java won't know what to inherit from the current working directory.

Choices, specify package on the first line of each class, or manually import the required classes.