title: Errors while trying to implement Comparable
body: <p>I keep getting this error in my user class:</p>
  
  <pre><code>User is not abstract and does not override abstract method compareTo(User) in Comparable
  </code></pre>
  
  <p>I'm not sure what it means or what to do to make it work. I did look on other similar posts but don't really understand the responses since they are most of the time specific to someone elses code. I can provide more information about what I'm trying to do if required.</p>
  
  <pre><code>public class User implements Comparable &lt; User &gt; {
  
      private String firstName;
      private String surname;
      private int booksOut;
  
      User(String inFirstName, String inSurname, int inBooksOut){
          this.firstName = inFirstName;
          this.surname = inSurname;
          this.booksOut = inBooksOut;
      }
  
      //...
  
  }
  </code></pre>
  
  <p>What i am essentially doing I am creating SortedLinkedList class from LinkedList and I have add method in there which uses compareTo, to order the data in ascending order as they are added.
  So when I call </p>
  
  <pre><code> User user1= new User("Dan", "Hill", 0); 
  SortedLinkedList LibraryUser = new SortedLinkedList(); 
  LibraryUser.add(user1);  
  </code></pre>
  
  <p>It creates new object which is saved in the sorted linked list.</p>