add the complete code for lab4

labs/4/Group.java

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+/*
+ * %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
+     * @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;
+        }
+    }
+
+}

labs/4/Student.java

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+/*
+ * %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/>.
+ */
+
+/**
+ * represents a student with generic terms and phrases to let programmers
+ * write more readable code.
+ *
+ * @author Dymik739
+ * @version 0.1
+ * @since 0.1
+ */
+public class Student {
+    /**
+     * name of the student
+     */
+    private String name;
+
+    /**
+     * overall ranking the student gets after finishing all courses
+     */
+    private double results;
+
+    /**
+     * a reasonable variable showing student motivation. The higher this
+     * number is, the better this student studies.
+     */
+    private double motivationPercent;
+
+    /**
+     * general ability to learn which directly affects learning speed.
+     */
+    private double learningAbilities;
+
+    /**
+     * shows the amount of subjects this student is studying.
+     */
+    private int chosenCoursesAmount;
+    
+    /**
+     * This constructor lets you create the Student class right away
+     *
+     * @param name the name of this student
+     * @param results starting point for the overall ranking score of this
+     *                student
+     * @param motivationPercent this student motivation level. Higher values
+     *                          allow for more jobs taken consecutively.
+     * @param learningAbilities directly affect learning speed of this student
+     * @param chosenCoursesAmount amount of courses chosen by this student.
+     *                            Roughly shows the load being put on them
+     * @since 0.1
+     */
+    public Student(String name, double results, double motivationPercent,
+                   double learningAbilities, int chosenCoursesAmount) {
+        this.name = name;
+        this.results = results;
+        this.motivationPercent = motivationPercent;
+        this.learningAbilities = learningAbilities;
+        this.chosenCoursesAmount = chosenCoursesAmount;
+    }
+    
+    /**
+     * This method allows you to print out the student object in a nice way.
+     *
+     * @since 0.1
+     */
+    @Override
+    public String toString() {
+        return "Student(name = '" + this.name + "', results = " + this.results +
+               ", motivationPercent = " + this.motivationPercent +
+               ", learningAbilities = " + this.learningAbilities +
+               ", chosenCoursesAmount = " + this.chosenCoursesAmount + ")";
+    }
+    
+    /**
+     * Getter for the private name field of this class
+     *
+     * @return String containing this student's name
+     * @since 0.1
+     */
+    public String getName() {
+        return this.name;
+    }
+    
+    /**
+     * Getter for the private results field of this class
+     *
+     * @return double representing final score of the student
+     * @since 0.1
+     */
+    public double getResults() {
+        return this.results;
+    }
+    
+    /**
+     * Getter for the private motivationPercent field of this class.
+     *
+     * @return double representing strenght of this student's motivation to
+     *         learn
+     * @since 0.1
+     */
+    public double getMotivationPercent() {
+        return this.motivationPercent;
+    }
+    
+    /**
+     * Getter for the private motivationPercent field of this class.
+     *
+     * @return double representing how quickly this student can learn
+     * @since 0.1
+     */
+    public double getLearningAbilitiesPercent() {
+        return this.learningAbilities;
+    }
+}