1Z0-809 Question #241: Real Exam Question with Answer & Explanation

Given: class Person { private String firstName; private int salary; public Person(String fN, int sal) { this.firstName = fN; this.salary = sal; } public int getSalary() { return salary; } public String getFirstName() { return firstName; } } and the code fragment: List<Person> prog = Arrays.asList( new Person("Smith", 1500), new Person("John", 2000), new Person("Joe", 1000)); double dVal = prog.stream() .filter(s -> s.getFirstName().startsWith("J")) .mapToInt(Person::getSalary) .average() .getAsDouble(); System.out.println(dVal); What is the result?