import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;

public class Algorithms {
    private static class Student implements Comparable<Student> {
        private float grade;
        private String name;

        @Override
        public int compareTo(Student student) {
            return Float.compare(grade, student.grade);
        }

        public float getGrade() {
            return grade;
        }

        public String getName() {
            return name;
        }

        public Student(String name, float grade) {

            this.grade = grade;
            this.name = name;
        }

        @Override
        public String toString() {
            return "Student{" +
                    "grade=" + grade +
                    ", name='" + name + '\'' +
                    '}';
        }
    }

    private static void printStudents(Collection<Student> collection) {
        for (Student student : collection) {
            System.out.println(student);
        }
    }

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

        students.add(new Student("Serban", 9.3f));
        students.add(new Student("Nicolae", 5.3f));
        students.add(new Student("Ion", 7.3f));

        System.out.println("Initial");
        printStudents(students);

        Collections.sort(students);

        System.out.println("Sortati dupa nota");
        printStudents(students);

        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student student, Student t1) {
                return -student.getName().compareTo(t1.getName());
            }
        });

        System.out.println("Sortati descrescator dupa nume");
        printStudents(students);
    }
}