Homework: Functional Programming

package FunctionalProgrammingHomeWork;

import java.lang.reflect.Array;
import java.time.Period;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Stream;

public class FunctionalProgramming {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<Student>();

        students.add(new Student(
                "Gosho"
                , "Petrov"
                , 26
                , "56324"
                , "0887658710"
                , "gosho@mail.bg"
                , new ArrayList<Integer>(Arrays.asList(2, 3, 6))
                , "2"));
        students.add(new Student(
                "Nikola"
                , "Petrov"
                , 18
                , "56333"
                , "0886452187"
                , "niki@mail.bg"
                , new ArrayList<Integer>(Arrays.asList(5, 5, 6))
                , "1"));
        students.add(new Student(
                "Nikola"
                , "Ankov"
                , 35
                , "55871"
                , "0882540307"
                , "nikola@yahoo.bg"
                , new ArrayList<Integer>(Arrays.asList(6, 6, 6))
                , "2"));
        students.add(new Student(
                "Milena"
                , "Bikolova"
                , 21
                , "56445"
                , "0886698024"
                , "slavena@abv.bg"
                , new ArrayList<Integer>(Arrays.asList(6, 4, 6))
                , "2"));
        students.add(new Student(
                "Avrora"
                , "Jekova"
                , 19
                , "56959"
                , "0886552844"
                , "avr@abv.bg"
                , new ArrayList<Integer>(Arrays.asList(2, 3, 3))
                , "2"));
        students.add(new Student(
                "Ana"
                , "Mabeva"
                , 19
                , "56819"
                , "0886550073"
                , "ana@abv.bg"
                , new ArrayList<Integer>(Arrays.asList(4, 5, 3))
                , "1"));
        students.add(new Student(
                "Ana"
                , "Huai"
                , 21
                , "55100"
                , "0882459073"
                , "ana@abv.bg"
                , new ArrayList<Integer>(Arrays.asList(4, 5, 3))
                , "1"));

        for (Student s : students) {
            if (s.getAge() < 22) {
                System.out.println(s.getFirstName());
            }
        }
        System.out.println("---------------------------");

        ArrayList<Student> studentsCopy = new ArrayList<>();
        studentsCopy.addAll(students);
        studentsCopy.removeIf(p -> p.getAge() > 22);
        studentsCopy.forEach(p -> System.out.println(p.getFirstName()));
        System.out.println("--------All Students---------------");
        students.forEach(s -> System.out.println(s.getFirstName() + " gr. " + s.getGroupNumbers()));

        System.out.println("--------group number 2 sorted by FirstName---------------");
        List<Student> studentsGroup2Sorted = new ArrayList<Student>();
        studentsGroup2Sorted.addAll(students);
        studentsGroup2Sorted.removeIf(s -> !s.getGroupNumbers().equalsIgnoreCase("2"));
        studentsGroup2Sorted.sort((s1, s2) -> s2.getFirstName().compareTo(s1.getFirstName()));
        studentsGroup2Sorted.forEach(s -> System.out.println(s.getFirstName() + " gr. " + s.getGroupNumbers()));

        System.out.println("----Print all students whose first name is before their last name alphabetically---");
        ArrayList<Student> studentsFirstBeforeLastName = new ArrayList<>();
        studentsFirstBeforeLastName.addAll(students);

        studentsFirstBeforeLastName.removeIf((s1) -> s1.getFirstName().charAt(0) > s1.getLastName().charAt(0));
        studentsFirstBeforeLastName.forEach(s1 -> System.out.println(s1.getFirstName() + " " + s1.getLastName()));

        System.out.println("--------the first name and last name of all students with age between 18 and 24---------------");
        studentsCopy = new ArrayList<>();
        studentsCopy.addAll(students);
        studentsCopy.removeIf(c -> (c.getAge() < 18 || c.getAge() > 24));
        studentsCopy.forEach(c -> System.out.println(c.getFirstName() + " " + c.getLastName() + " " + c.getAge()));


        System.out.println("------sort the students by first name and last name in descending order----------");
        studentsCopy = new ArrayList<>();
        studentsCopy.addAll(students);
        studentsCopy.sort(
                ((s1,s2) -> s2.getFirstName().compareTo(s1.getFirstName()))

        );

        studentsCopy.forEach(s -> System.out.println(s.getFirstName()+" "+s.getLastName()+" "+s.getAge()));




    }
}