oop-labs-collection/labs/4/Group.java

/*
 * %W% %E% Dymik739
 * Email: dymik739@109.86.70.81
 *
 * Copyright (C) 2023 FIOT Dev Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

import java.util.Arrays;

/**
 * Group class defines a representation of a university group with students
 * that can be used as a convenient structure to look at students' statistics.
 *
 * @version 0.1 20 May 2023
 * @author Dymik739
 */
public class Group {
    /**
     * Main method which should be executed at the start of this application.
     *
     * @since 0.1
     */
    public static void main() {
        Student[] studentList = {
            // name, results, motivation%, ability%, course№
            new Student("Davie", 16.3, 93.5, 98.9, 5),
            new Student("Terry", 99.4, 49.3, 73.2, 7),
            new Student("Mark", 67.9, 15.5, 7.8, 4),
            new Student("Rand", 85.5, 82.6, 99.9, 12),
            new Student("Steve", 1.2, 99.8, 99.2, 1)
        };

        System.out.println("Original students array:");
        printStudents(studentList);

        Arrays.sort(studentList, (o1, o2) -> o1.getName().compareTo(o2.getName()));

        System.out.println("\nArray, sorted by students' name:");
        printStudents(studentList);

        Arrays.sort(studentList, (o1, o2) ->
                    compareDouble(o2.getResults(), o1.getResults()));

        System.out.println("\nArray, sorted by the reverse of students' " +
                           "score results:");
        printStudents(studentList);

        System.out.println("\nAs we can clearly see, " +
                           studentList[studentList.length-1].getName() + " with " +
                           studentList[studentList.length-1].getMotivationPercent() + 
                           "% of motivation and " +
                           studentList[studentList.length-1].getLearningAbilitiesPercent() +
                           "% ability to learn will be the one who is kicked " +
                           "from this university, because such is our life.");
    }
    
    /**
     * Outputs to stdout a given array of students in a fancy way.
     *
     * @param array array to print out
     */
    private static void printStudents(Student[] array) {
        for (Student s : array) {
            System.out.println(s);
        }
    }

    /**
     * Compares numbers of type Double
     *
     * @param i1 first number to compare
     * @param i2 second number to compare
     * @return if the first argument is greater, 1 is returned
     *         if the second argument is greater, -1 is returned
     *         if the arguments are equal, 0 is returned
     */
    private static int compareDouble(double i1, double i2) {
        if (i1 > i2) {
            return 1;
        } else if (i1 < i2) {
            return -1;
        } else {
            return 0;
        }
    }

}