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import java.util.List;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.Comparator;
import java.util.function.Predicate;
import java.lang.Iterable;
import java.time.chrono.IsoChronology;


public class RosterTest {

    interface CheckPerson {
        boolean test(Person p);
    }

    // Approach 1: Create Methods that Search for Persons that Match One
    // Characteristic

    public static void printPersonsOlderThan(List roster, int age) {
        for (Person p : roster) {
            if (p.getAge() >= age) {
                p.printPerson();
            }
        }
    }

    // Approach 2: Create More Generalized Search Methods

    public static void printPersonsWithinAgeRange(
        List roster, int low, int high) {
        for (Person p : roster) {
            if (low = 18
                    && p.getAge() = 18
                        && p.getAge()  p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge()  p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge()  p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge()  p.printPerson()
        );

        System.out.println();

        // Approach 7, second example

        System.out.println("Persons who are eligible for Selective Service " +
            "(with Predicate, Function, and Consumer parameters):");

        processPersonsWithFunction(
            roster,
            p -> p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge()  p.getEmailAddress(),
            email -> System.out.println(email)
        );

        System.out.println();

        // Approach 8: Use Generics More Extensively

        System.out.println("Persons who are eligible for Selective Service " +
            "(generic version):");

        processElements(
            roster,
            p -> p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge()  p.getEmailAddress(),
            email -> System.out.println(email)
        );

        System.out.println();

        // Approach 9: Use Bulk Data Operations That Accept Lambda Expressions
        // as Parameters

        System.out.println("Persons who are eligible for Selective Service " +
            "(with bulk data operations):");

        roster
            .stream()
            .filter(
                p -> p.getGender() == Person.Sex.MALE
                    && p.getAge() >= 18
                    && p.getAge()  p.getEmailAddress())
            .forEach(email -> System.out.println(email));
     }
}