import java.util.Arrays;
import java.util.Comparator;

public final class StudentSortExample {
    static final class Student {
        final String name;
        final int score;
        Student(String name, int score) { this.name = name; this.score = score; }
        @Override public String toString() { return name + ":" + score; }
    }

    public static void main(String[] args) {
        Student[] students = {
            new Student("An", 7), new Student("Binh", 3),
            new Student("Chi", 5), new Student("Dung", 3),
            new Student("Em", 9), new Student("Phuc", 1)
        };
        Arrays.sort(students, Comparator.comparingInt(s -> s.score));
        if (!students[1].name.equals("Binh") || !students[2].name.equals("Dung")) {
            throw new AssertionError("Equal-score order changed");
        }
        System.out.println(Arrays.toString(students));
    }
}