public class Student implements java.lang.Comparable<Student> {
  private String firstName;
  private String lastName;
  
  public Student(String fname, String lname) {
    firstName = fname;
    lastName = lname;
  }
  
  public void setFirstName( String firstName ) {
    this.firstName = firstName;  
  }
  
  public void setLastName( String lastName ) {
    this.lastName = lastName;  
  }
  
  public String getFirstName() {
    return firstName;
  }
  
  public String getLastName() {
    return lastName;
  }
       
  public String toString() {
    return firstName+" "+lastName;
  }
  
  public boolean equals(Object o) {
    return (o instanceof Student && o.hashCode() == this.hashCode());
  }
  
  public int hashCode() {
    return 3 * firstName.hashCode() + 5 * lastName.hashCode();
  }
  
  public int compareTo(Student st) {
    return lastName.compareTo(st.lastName) != 0 ? lastName.compareTo(st.lastName) : firstName.compareTo(st.firstName);
  }
}