Finding max grade using lambda expression in Java

FindMaxLambda.java

public class FindMaxLambda {

  public static void main(String[] args) {
    Set<Student> aSetOfStudent = initStudents();
    OptionalInt maxGrade = 
      aSetOfStudents
        .stream().filter(s -> 2014 == s.getGraduationYear())
                  .map(s -> s.getScore())
                  .max();
    
    System.out.printf("maxGrade: %d%n", maxGrade.getAsInt());
  }
  
  private static Set<Student> initStudents() {
    //initialize a set of Student
  }
}