Question

Here’s the code

public void findDNode(String name)
{
    DNode u = header;
    while(u != null)
    {

        if(name == u.getElement())
        {
            System.out.println(u.getElement());
            break;
        }
        else if (u == null)
        {
            System.out.println("Error: not found");
            break;
        }

        u = u.nextNode();
    }

}

For some reason when the node that I am looking for doesn’t exist it’s doesn’t print the error: not found message.

edit: nevermind just realised when u== null the while loop won’t happen

Answer 1

u never becomes null inside the loop! Perform the check after the loop.

public void findDNode(String name)
{
    DNode u = header;
    while(u != null)
    {

        if(name == u.getElement())
        {
            System.out.println(u.getElement());
            break;
        }

        u = u.nextNode();
    }
   if (u==null)
       System.out.println("Error: not found");

}

Edit: and yes, you should use equals()