/** Encapsulate information relating to a single student.
 ** @author: Jonathan Doughty
 **/

public class CSStudent {

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

  private String GMU_Id;
  private String name;
  private int    homeworkGrade;
  private CSStudent labPartner;

  // Constructors for the class

  private CSStudent() { // why do you think this is?
  }

  public CSStudent( String name, String id) {
    this.name = name;
    GMU_Id = id;
  }

  // An accessor method to set the Student's name field; not
  // needed any more but left in because a student's name could
  // change.
  public void setName( String studentName ) {
    name = studentName;
  }

  // An accessor method to return this Student's name
  public String getName() {
    return name;
  }

  // An accessor method to set the Student's GMU_Id field (probably
  // no longer necessary)
  public void setId( String id ) {
    GMU_Id = id;
  }

  // An accessor method to set the Student's homeworkGrade field
  public void setGrade( int grade ) {
    homeworkGrade = grade;
  }

  // An accessor method to assign this Student's lab partner
  public void setLabPartner( CSStudent s ) {
    labPartner = s;
  }

  // Using the toString method to enable an instance of an
  // object to identify itself usefully.
  public String toString() {

    // Since I'm going to be returning a String made up of various
    // pieces, I build up those pieces in a StringBuffer.

    StringBuffer sb = new StringBuffer();
    sb.append(name);
    sb.append(" Id# ");
    sb.append(GMU_Id);
    if (labPartner != null) {
      // Notice I don't just use labPartner.toString().  If I did
      // I would create an infinite loop: each lab partner calls
      // its lab partner's toString() which calls's its lab
      // partner's toString() ...  Instead, I just get and append
      // the lab partner's name.
      sb.append(" lab partner=");
      sb.append( labPartner.getName());
    }
    return sb.toString();
  }
}