/** encapsulate the characteristics of any one student
 ** @author: Jonathan Doughty
 **/

public abstract class AnyStudent {

  private static long nextId = 0;

  // Instance variables (fields) that will be associated with each student

  private String name;
  private long   id;
  private long   tuitionPaid;
  private long   tuitionOwed;  

  // A constructor that will create student objects with specified name and id
  public AnyStudent( String studentName) {
    name = studentName;
    id = nextId;
    nextId++;
  }

  // I'm not going to allow other users of the AnyStudent class create
  // Students without a name and an id value. 
  private AnyStudent() {
  }

  public String toString() {
    return name + ":" + id;
  }

  public void payTuition(int amount) {
    tuitionPaid += amount;
    tuitionOwed -= amount;
  }

  public long tuitionOwed() {
    return tuitionOwed;
  }
}