public class Student {
   private String myName; // Student's name
   private int myNumQuizzes; // Number of quizzes
   private int myTotalQuizScore; // Sum of quiz scores

   public Student(String name) {
      // new student, with name, but no quizzes
      myName = name;
      myNumQuizzes = 0;
      myTotalQuizScore = 0;
   }
   
   public Student() { // just for fun
      this("John Doe");
   }
   
   public String getName() {
      // return the student's name
      return myName;
   }
   
   public int getTotal() {
      // return the total scores on all quizzes taken
      return myTotalQuizScore;
   }
   
   public int getNumQuizzes() {
      // return the number of quizzes taken
      return myNumQuizzes;
   }
   
   public void addQuiz(int score) {
      // record a new quiz
      myTotalQuizScore = myTotalQuizScore + score;
      myNumQuizzes++;
   }
   
   public double getAverageScore() {
      // calculate average quiz grade
      if (myNumQuizzes == 0) return 0.0;
      else 
         return (double)myTotalQuizScore/
            (double)myNumQuizzes;
   }
   
   public String toString() {
      // return all the data as a string
      return "Name: " + myName +
         "\n  # quizzes: " + getNumQuizzes() +
         "\n  Total Quiz Score: " + myTotalQuizScore +
         "\n  Average Score: " + getAverageScore();
   }
}

public class StudentTest {

   public static void main(String[] args) {
      Student noName = new Student();
      System.out.println(noName);
      Student s1 = new Student("Frank Griswold");
      s1.addQuiz(18);
      s1.addQuiz(20);
      s1.addQuiz(16);
      System.out.println(s1);
      Student s2 = new Student("Sarah Conner");
      System.out.println(s2);
   }
}

Output:
Name: John Doe
  # quizzes: 0
  Total Quiz Score: 0
  Average Score: 0.0
Name: Frank Griswold
  # quizzes: 3
  Total Quiz Score: 54
  Average Score: 18.0
Name: Sarah Conner
  # quizzes: 0
  Total Quiz Score: 0
  Average Score: 0.0