package lambda;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.function.Predicate;

class SmartPredicate implements Predicate<Student> {

@Override

public boolean test(Student student) {

return student.getGpa() > 3;

}

}

public class School {

public static List<Student> getByPredicate(

List<Student> in, Predicate<Student> pred) {

List<Student> out = new ArrayList<>();

for (Student s : in) {

if (pred.test(s)) {

out.add(s);

}

}

return out;

}

public static void showAll(List<Student> students) {

for (Student s : students) {

System.out.println(s);

}

System.out.println("-----------------");

}

public static void main(String[] args) {

List<Student> roster = Arrays.asList(

new Student("Fred", 3.2, "Math", "Physics"),

new Student("Jim", 2.2, "Art"),

new Student("Sheila", 3.9, "Math", "Physics", "Quantum Physics")

);

showAll(roster);

showAll(getByPredicate(roster, new SmartPredicate()));

showAll(getByPredicate(roster, (Student s) -> {return s.getGpa() > 3;}));

showAll(getByPredicate(roster, (s) -> {return s.getGpa() > 3;}));

showAll(getByPredicate(roster, s -> {return s.getGpa() > 3;}));

showAll(getByPredicate(roster, s -> s.getGpa() < 3));

}

}