public class Student {
  private static int numOfStudents = 0;
  private int id;
  private String firstName;
  private String lastName;
  
  public Student(String fname, String lname) {
    firstName = fname;
    lastName = lname;
    id=++numOfStudents;
  }
  
  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 int getId() {
    return id;
  }
  
  public boolean equals(Object obj) {
    if(!(obj instanceof Student) )
      return false;
    Student st = (Student)obj;
    if( id == id && firstName.equals(st.firstName) && lastName.equals(st.lastName) )
      return true;
    return false;
  }
  
  public String toString() {
    return id+". "+firstName+" "+lastName;
  }
}