Update lab4

Lab4.java

@@ -1,68 +0,0 @@
-import java.util.Scanner;
-import java.util.Arrays;
-import java.util.Comparator;
-
-public class Lab4 {
-
-    public static void main(String[] args) {
-        Students student1 = new Students("Максим", 22, "ФІОТ", 91, 8);
-        Students students2 = new Students("Ольга", 19, "ФЕА", 34, 4);
-        Students students3 = new Students("Владислав", 18, "ФММ", 55, 10);
-        Students students4 = new Students("Марія", 20, "ХТФ", 11, 6);
-        Students students5 = new Students("Петро", 23, "ФМФ", 78, 2);
-        Students[] students = {student1, students2, students3, students4, students5};
-        System.out.println("Список студентів: ");
-        System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", "Ім'я", "Вік", "Факультет", "Номер групи", "Рівень знань(від 0 до 10)"));
-        for (Students student : students) {
-            System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", student.getName(), student.getAge(), student.getNameOfFaculty(), student.getNumberOfGroup(), student.getLvlOfKnowledge()));
-        }
-        Scanner scan = new Scanner(System.in);
-        System.out.println("Введіть за чим сортувати: ");
-        System.out.println("1 - Зростання \n2 - Спадання:");
-        int incOrDec = scan.nextInt();
-        System.out.println("Введіть за чим хочете сортувати: ");
-        System.out.println("1 - Ім'я \n2 - Вік \n3 - Факультет\n4 - Група\n5 - Рівень знань: ");
-        int num = scan.nextInt();
-        if (incOrDec == 1) {
-            switch (num) {
-                case 1:
-                    Arrays.sort(students, Comparator.comparing(Students::getName));
-                    break;
-                case 2:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getAge));
-                    break;
-                case 3:
-                    Arrays.sort(students, Comparator.comparing(Students::getNameOfFaculty));
-                    break;
-                case 4:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getNumberOfGroup));
-                    break;
-                case 5:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getLvlOfKnowledge));
-                    break;
-            }
-        } else {
-            switch (num) {
-                case 1:
-                    Arrays.sort(students, Comparator.comparing(Students::getName).reversed());
-                    break;
-                case 2:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getAge).reversed());
-                    break;
-                case 3:
-                    Arrays.sort(students, Comparator.comparing(Students::getNameOfFaculty).reversed());
-                    break;
-                case 4:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getNumberOfGroup).reversed());
-                    break;
-                case 5:
-                    Arrays.sort(students, Comparator.comparingInt(Students::getLvlOfKnowledge).reversed());
-                    break;
-            }
-        }
-        System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", "Ім'я", "Вік", "Факультет", "Номер групи", "Рівень знань(від 0 до 10)"));
-        for (Students student : students) {
-            System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", student.getName(), student.getAge(), student.getNameOfFaculty(), student.getNumberOfGroup(), student.getLvlOfKnowledge()));
-        }
-    }
-}

Lab5.java

@@ -1,107 +0,0 @@
-public class Lab5 {
-    public static void main(String[] args) {
-        StringBuilder txt = new StringBuilder("соціальна мережа, яка є мережею мікроблогів. Дає змогу користувачам надсилати короткі текстові повідомлення (до 2802 символів, до 2017 року — до 140 символів), використовуючи SMS,");
-        System.out.println("Початковий текст:");
-        System.out.println(txt);
-        Text text = new Text(txt);
-        StringBuilder result = text.splitText();
-        System.out.println("Змінений текст:");
-        System.out.println(result);
-    }
-}
-
-class Text {
-    private final StringBuilder textString;
-    public Text(StringBuilder textString){
-        this.textString = textString;
-    }
-
-    public StringBuilder splitText() {
-        StringBuilder result = new StringBuilder();
-        String[] sentenceStrings = textString.toString().split("(?<=[?.!])\\s?");
-        for (String s : sentenceStrings) {
-            StringBuilder sb = new StringBuilder(s);
-            Sentence sentence = new Sentence(sb);
-            result.append(sentence.splitSentence());
-        }
-        return result;
-    }
-
-}
-
-class Sentence {
-    private final StringBuilder sentence;
-
-    public Sentence(StringBuilder sentence) {
-        this.sentence = sentence;
-
-    }
-
-    public StringBuilder splitSentence() {
-        StringBuilder returnSentence = new StringBuilder();
-        String text = sentence.toString();
-        String[] words = text.split(" ");
-        for (String w : words) {
-            StringBuilder wb = new StringBuilder(w);
-            Word word = new Word(wb);
-            returnSentence.append(word.splitWord()).append(" ");
-        }
-        return returnSentence;
-
-    }
-}
-
-class Word {
-    private final StringBuilder word;
-
-    public Word(StringBuilder word) {
-        this.word = word;
-    }
-
-    public StringBuilder splitWord() {
-        StringBuilder returnWord = new StringBuilder();
-        String wordstring = word.toString();
-        String[] letters = wordstring.split("");
-        String firstLetter = wordstring.substring(0, 1);
-        returnWord.append(firstLetter);
-        for (String l: letters){
-            StringBuilder lb = new StringBuilder(l);
-            Letter letter = new Letter(lb);
-            if (firstLetter.equals(letter.getLetter().toString())){
-                returnWord.append("");
-            }else{
-                if(l.equals("!") || l.equals("?") || l.equals(".") || l.equals(",") || l.equals(":") || l.equals(";")){
-                    Punctuation punctuation = new Punctuation(lb);
-                    returnWord.append(punctuation.getPunctuation());
-                }else{
-                    returnWord.append(letter.getLetter());
-                }
-            }
-        }
-        return returnWord;
-    }
-}
-
-class Letter {
-    private final StringBuilder letter;
-
-    public Letter(StringBuilder letter) {
-        this.letter = letter;
-    }
-
-    public StringBuilder getLetter() {
-        return letter;
-    }
-}
-
-class Punctuation {
-    private final StringBuilder punctuation;
-
-    public Punctuation(StringBuilder punctuation) {
-        this.punctuation = punctuation;
-    }
-
-    public StringBuilder getPunctuation() {
-        return punctuation;
-    }
-}

Students.java

@@ -1,30 +0,0 @@
-public class Students {
-    private String name;
-    private int age;
-    private String nameOfFaculty;
-    private int numberOfGroup;
-    private int lvlOfKnowledge;
-
-    public Students(String name, int age, String nameOfFaculty, int numberOfGroup, int lvlOfKnowledge) {
-        this.name = name;
-        this.age = age;
-        this.nameOfFaculty = nameOfFaculty;
-        this.numberOfGroup = numberOfGroup;
-        this.lvlOfKnowledge = lvlOfKnowledge;
-    }
-    public String getName() {
-        return name;
-    }
-    public int getAge() {
-        return age;
-    }
-    public String getNameOfFaculty() {
-        return nameOfFaculty;
-    }
-    public int getNumberOfGroup() {
-        return numberOfGroup;
-    }
-    public int getLvlOfKnowledge() {
-        return lvlOfKnowledge;
-    }
-}

lab1 fedoniuk

@@ -0,0 +1,96 @@
+import java.util.Scanner;
+
+public class lab1 {
+    public static void main(String[] args) {
+        int C2, C3, C5;
+        var C7 = 0;
+
+        Scanner id = new Scanner(System.in);
+        System.out.print("Enter the student's ID number: ");
+        int idbook = id.nextInt();
+
+        C2 = idbook % 2;
+        C3 = idbook % 3;
+        C5 = idbook % 5;
+        C7 = idbook % 7;
+
+        String[] oper1 = {"+", "-"};
+        String[] oper2 = {"*", "/", "%", "+", "-"};
+        String[] oper3 = {"byte", "short", "int", "long", "char", "float", "double"};
+
+        int C = C3;
+
+        String O1 = oper1[C2];
+        String O2 = oper2[C5];
+        String O3 = oper3[C7];
+
+        System.out.println("C2 is: " + C2 + ", operation is: " + O1);
+        System.out.println("C3 = " + C);
+        System.out.println("C5 is: " + C5 + ", operation is: " + O2);
+        System.out.println("C7 is: " + C7 + ", Type of indexes i and j is: " + O3);
+
+        double i = 0;
+        double j = 0;
+        System.out.println("\nEnter a values for lower limits (i and j) in the "+ O3+" type: ");
+        switch (O3) {
+            case "byte" -> {
+                i = id.nextByte();
+                j = id.nextByte();
+            }
+            case "short" -> {
+                i = id.nextShort();
+                j = id.nextShort();
+            }
+            case "int" -> {
+                i = id.nextInt();
+                j = id.nextInt();
+            }
+            case "long" -> {
+                i = id.nextLong();
+                j = id.nextLong();
+            }
+            case "char" -> {
+                i = id.next().charAt(0);
+                j = id.next().charAt(0);
+            }
+            case "float" -> {
+                i = id.nextFloat();
+                j = id.nextFloat();
+            }
+            case "double" -> {
+                i = id.nextDouble();
+                j = id.nextDouble();
+            }
+        }
+
+        System.out.println("The value of the created variables is: " + i + " and " + j);
+        System.out.println("Enter values for top limits (n and m):");
+        int n, m;
+        n = id.nextInt();
+        m = id.nextInt();
+
+        double sum = 0, res = 0, res2 = 0;
+
+        if ((O1.equals("-") && i + n >= C && i <= C) || i > n || j > m || (C == 0 && i == 0)) {
+            System.out.println("Incorrect input, try another values");
+        } else {
+            for (double a = i; a <= n; a++) {
+                for (double b = j; b <= m; b++) {
+                    switch (O1) {
+                        case "+" -> res = a + C;
+                        case "-" -> res = a - C;
+                    }
+                    switch (O2) {
+                        case "+" -> res2 = a + b;
+                        case "-" -> res2 = a - b;
+                        case "*" -> res2 = a * b;
+                        case "/" -> res2 = a / b;
+                        case "%" -> res2 = a % b;
+                    }
+                    sum += res2 / res;
+                }
+            }
+            System.out.println("Sum is: " + sum);
+        }
+    }
+}

lab1.java

@@ -1,29 +0,0 @@
-import java.util.Scanner;
-
-public class lab1 {
-    public static void main(String[] args) {
-        float S = 0, i, j;
-        int C = 1;
-        Scanner scan = new Scanner(System.in);
-        System.out.println("Введіть значення a (a>1):");
-        int a = scan.nextInt();
-        System.out.println("Введіть значення b:");
-        int b = scan.nextInt();
-        System.out.println("Введіть значення n:");
-        int n = scan.nextInt();
-        System.out.println("Введіть значення m:");
-        int m = scan.nextInt();
-        for (i = a; i <= n; i++) {
-            if (i - C == 0) {
-                System.out.println("Ділення на 0");
-                return;
-            }
-            for (j = b; j <= m; j++) {
-                S += (i - j) / (i - C);
-
-            }
-        }
-        System.out.println(S);
-
-    }
-}

lab2

@@ -0,0 +1,76 @@
+import java.util.Scanner;
+import java.util.Random;
+
+public class Lab2 {
+    public static void main(String[] args) {
+        int C5, C11, C7;
+        int idbook = 2430;
+
+        C5 = idbook % 5;
+        C7 = idbook % 7;
+        C11 = idbook % 11;
+
+        System.out.println("C5 = " + C5 + " - Action between matrix is: C=a×B, a - const");
+        System.out.println("C7 = " + C7 + " - The matrix elements type is: byte");
+        System.out.println("C11 = " + C11 + " - The action with matrix C is: Find the matrix elements' average value");
+
+        Scanner sc = new Scanner(System.in);
+        System.out.print("\n Enter the number of rows: ");
+        int rows = sc.nextInt();
+        System.out.print(" Enter the number of columns: ");
+        int cols = sc.nextInt();
+        int min = 0;
+        int max = 0;
+        boolean valid = false;
+        while (!valid) {
+            System.out.print("\n Enter the minimum value of the matrix numbers (-128 to 127): ");
+            min = sc.nextInt();
+            System.out.print(" Enter the maximum value of the matrix numbers (-128 to 127): ");
+            max = sc.nextInt();
+            if (min >= -128 && max <= 127 && min < max) {
+                valid = true;
+            } else {
+                System.out.println("\nInvalid input. Please enter the values again.");
+            }
+        }
+        byte[][] matrix = new byte[rows][cols];
+        Random rand = new Random();
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                matrix[i][j] = (byte) (rand.nextInt(max - min + 1) + min);
+            }
+        }
+        System.out.println("\nThe matrix is:");
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                System.out.printf(" %-5d", matrix[i][j]);
+            }
+            System.out.println();
+        }
+
+        System.out.print("\nEnter the constant to multiply the matrix by: ");
+        int constant = sc.nextInt();
+        byte[][] multipliedMatrix = new byte[rows][cols];
+        System.out.println(" The matrix multiplied by " + constant + " is:");
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                multipliedMatrix[i][j] = (byte) (matrix[i][j] * constant);
+                System.out.printf(" %-5d", multipliedMatrix[i][j]);
+            }
+            System.out.println();
+        }
+
+        System.out.println("\n Press 'enter' to search for the average value of the matrix.");
+        sc.nextLine();
+        sc.nextLine();
+        int sum = 0;
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                sum += multipliedMatrix[i][j];
+            }
+        }
+        double average = (double) sum / (rows * cols);
+        System.out.println("The average value of the multiplied matrix is: " + average);
+    }
+}
+

lab2.java

@@ -1,78 +0,0 @@
-import java.util.Scanner;
-import java.util.Random;
-
-public class lab2 {
-    public static void main(String[] args) {
-        Scanner scan = new Scanner(System.in);
-
-        System.out.println("Введіть кількість рядків матриці А:");
-        int mA = scan.nextInt();
-        System.out.println("Введіть кількість стовпців матриці А:");
-        int nA = scan.nextInt();
-        System.out.println("Введіть кількість рядків матриці B:");
-        int mB = scan.nextInt();
-        if (nA != mB) {
-            System.out.println("Щоб помножити матриці, потрібно, щоб кількість стовпців матриці А == кількості рядків матриці B");
-            return;
-        }
-        System.out.println("Введіть кількість стовпців матриці B:");
-        int nB = scan.nextInt();
-        System.out.println("Границя значень у матрицях:");
-        int upperbound = scan.nextShort();
-        int[][] matrixA = new int[mA][nA];
-        int[][] matrixB = new int[mB][nB];
-        int[][] matrixC = new int[mA][nB];
-        generationMatrixes(matrixA, matrixB, upperbound);
-        printMatrixC(matrixA, matrixB, matrixC);
-        AverageValueofElementsofEachColumn(matrixC);
-    }
-
-    private static void AverageValueofElementsofEachColumn(int[][] matrixC) {
-        System.out.println("Середнє значення елементів кожного стовпчика матриці:");
-        System.out.print("||");
-        for (int i = 0; i < matrixC.length; i++) {
-            double sum = 0;
-            for (int j = 0; j < matrixC[i].length; j++) {
-                sum += matrixC[j][i];
-            }
-            System.out.printf(" %.2f ||", (sum) / matrixC.length);
-        }
-    }
-
-    private static void printMatrixC(int[][] matrixA, int[][] matrixB, int[][] matrixC) {
-        for (int i = 0; i < matrixC.length; i++) {
-            for (int j = 0; j < matrixC[i].length; j++) {
-                for (int k = 0; k < matrixA[j].length; k++) {
-                    matrixC[i][j] += matrixA[i][k] * matrixB[k][j];
-                }
-            }
-        }
-        System.out.println("Матриця С:");
-        for (int i = 0; i < matrixC.length; i++) {
-            for (int j = 0; j < matrixC[i].length; j++) {
-                System.out.printf("|%4d", matrixC[i][j]);
-            }
-            System.out.println("|");
-        }
-    }
-
-    private static void generationMatrixes(int[][] matrixA, int[][] matrixB, int upperbound) {
-        Random rand = new Random();
-        System.out.println("Матриця А:");
-        for (short i = 0; i < matrixA.length; i++) {
-            for (int j = 0; j < matrixA[i].length; j++) {
-                matrixA[i][j] = rand.nextInt(upperbound);
-                System.out.printf("|%4d", matrixA[i][j]);
-            }
-            System.out.println("|");
-        }
-        System.out.println("Матриця B:");
-        for (short i = 0; i < matrixB.length; i++) {
-            for (int j = 0; j < matrixB[i].length; j++) {
-                matrixB[i][j] = rand.nextInt(upperbound);
-                System.out.printf("|%4d", matrixB[i][j]);
-            }
-            System.out.println("|");
-        }
-    }
-}

lab3

@@ -0,0 +1,38 @@
+import java.util.Scanner;
+
+public class lab3 {
+    public static void main(String[] args) {
+
+        int C17 = 2430 % 17;
+        System.out.println("\n---------------------------------------------------------------------------------------------------------------------");
+        System.out.println("  C17 = " + C17 + ", So, the task is:  delete all previous occurrences of the last letter of each word of the specified text");
+        System.out.println("---------------------------------------------------------------------------------------------------------------------");
+
+        Scanner scanner = new Scanner(System.in);
+        String input = null;
+        while (input == null || input.isEmpty()) {
+            System.out.print("\nEnter a string: ");
+            input = scanner.nextLine();
+        }
+        try {
+            StringBuilder sb = new StringBuilder(input);
+            String[] words = sb.toString().split("\\s+");
+            for (int i = 0; i < words.length; i++) {
+                String word = words[i];
+                char lastLetter = word.charAt(word.length() - 1);
+                String newWord = "";
+                for (int j = 0; j < word.length() - 1; j++) {
+                    if (word.charAt(j) != lastLetter) {
+                        newWord += word.charAt(j);
+                    }
+                }
+                newWord += lastLetter;
+                words[i] = newWord;
+            }
+            System.out.print("\nFinal string: ");
+            System.out.println(String.join(" ", words));
+        } catch (Exception e) {
+            System.out.println("An error occurred: " + e.getMessage());
+        }
+    }
+}

lab3.java

@@ -1,21 +0,0 @@
-public class lab3 {
-    public static void main(String[] args) {
-        StringBuilder txt = new StringBuilder("— соціальна мережа, яка є мережею мікроблогів, дає змогу користувачам надсилати короткі текстові повідомлення (до 2802 символів, до 2017 року — до 140 символів), використовуючи SMS,");
-        System.out.println(txt);
-        String[] words = txt.toString().split("\\s+");
-        StringBuilder result = new StringBuilder();
-        for (int i = 0; i < words.length; i++) {
-            StringBuilder word = new StringBuilder(words[i]);
-            StringBuilder firstLetter = new StringBuilder(word.substring(0, 1));
-            if (word.substring(1).contains(firstLetter.toString().toLowerCase()) || word.substring(1).contains(firstLetter)) {
-                String changedWord = firstLetter + word.substring(1).replaceAll(firstLetter.toString().toLowerCase(), "").replaceAll(firstLetter.toString(), "");
-                result.append(changedWord);
-                result.append(" ");
-            } else {
-                result.append(word);
-                result.append(" ");
-            }
-        }
-        System.out.println(result);
-    }
-}

lab4

@@ -0,0 +1,115 @@
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Scanner;
+
+public class Lab4 {
+
+    public static class Student {
+        private int grBook;
+        private String name;
+        private int age;
+        private double gpa;
+        private String faculty;
+
+        public Student(int grBook, String name, int age, double gpa, String faculty) {
+            this.grBook = grBook;
+            this.name = name;
+            this.age = age;
+            this.gpa = gpa;
+            this.faculty = faculty;
+        }
+
+        public int getGrBook() {
+            return grBook;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public int getAge() {
+            return age;
+        }
+
+        public double getGpa() {
+            return gpa;
+        }
+
+        public String getFaculty() {
+            return faculty;
+        }
+    }
+
+    public static void main(String[] args) {
+
+        int C11 = 2430 % 11;
+        System.out.println("\n  ----------------------------------------------------------------------------------------------------------");
+        System.out.println("          C11 = " + C11 + ", So, the task is:  Define the student class, which consists of at least 5 fields.");
+        System.out.println("  ----------------------------------------------------------------------------------------------------------");
+
+        Student[] students = {
+                new Student(1010, "Вікторія", 21, 84.6, "ФІОТ"),
+                new Student(2010, "Дарія", 20, 79.8, "РТФ"),
+                new Student(3010, "Анатолій", 19, 94.3, "ХТФ"),
+                new Student(4040, "Генадій", 22, 62.0, "ІХФ"),
+                new Student(5050, "Борис", 18, 89.1, "ФММ")
+        };
+
+        Scanner scanner = new Scanner(System.in);
+        boolean quit = false;
+        while (!quit) {
+
+            System.out.print("\nEnter the field to sort by (greed book, name, age, gpa, faculty) or enter 'quit' to exit: ");
+            String input = scanner.nextLine();
+
+            if (!input.equals("greed book") && !input.equals("name") && !input.equals("age") && !input.equals("gpa") && !input.equals("faculty") && !input.equals("quit")) {
+                System.out.println("Invalid field to sort by! Please enter 'grBook', 'name', 'age', 'gpa', or 'faculty'.");
+                continue;
+            }
+            if (input.equals("quit")) {
+                quit = true;
+                System.out.println("Thank you for using my program:)");
+                continue;
+            }
+
+            String field = input;
+            System.out.print("Enter the sort order (asc or desc): ");
+            String order = scanner.nextLine();
+
+            if (!order.equals("asc") && !order.equals("desc")) {
+                System.out.println("Invalid sort order! Please enter 'asc' or 'desc'.");
+                continue;
+            }
+
+            Comparator<Student> comparator = null;
+            switch (field) {
+                case "greed book":
+                    comparator = Comparator.comparingInt(Student::getGrBook);
+                    break;
+                case "name":
+                    comparator = Comparator.comparing(Student::getName);
+                    break;
+                case "age":
+                    comparator = Comparator.comparingInt(Student::getAge);
+                    break;
+                case "gpa":
+                    comparator = Comparator.comparingDouble(Student::getGpa);
+                    break;
+                case "faculty":
+                    comparator = Comparator.comparing(Student::getFaculty);
+                    break;
+            }
+            if (order.equals("desc")) {
+                comparator = comparator.reversed();
+            }
+            Arrays.sort(students, comparator);
+
+            System.out.println("\nSorted by " + field + " (in " + order + "ending order):");
+            System.out.println(String.format("%n%-15s | %-20s | %-4s | %-4s | %-10s", "Greed book", "Name", "Age", "GPA", " Faculty"));
+            System.out.println("----------------------------------------------------------------");
+            for (Student student : students) {
+                System.out.println(String.format("%-15d | %-20s | %-4d | %-3.1f | %-10s", student.getGrBook(), student.getName(), student.getAge(), student.getGpa(), student.getFaculty()));
+            }
+        }
+    }
+}

src/Lab1.java

@@ -1,58 +0,0 @@
-public class Lab1 {
-    public static void main(String[] args) {
-//        char c = 'a' + '1';
-        char c = 97;
-//        char c = '1';
-        System.out.println(c);
-        System.out.println((int) c);
-        c++;
-        System.out.println(c);
-        System.out.println((int) c);
-        System.out.println((double)'1'/'3');
-
-//        System.out.println( (double) 0 / 0 );
-//        System.out.println( Math.sqrt(-1) );
-        double s = 0;
-        /*for (int i = 1; i <= 3; i++) { // 1) ��������� � i = 1, 2) ���� � <= 3, 3) �������� 䳿 � �� �����,
-            System.out.println(i);     // 4) �������������� � �� 1, 5) ����������� �� ����� 2
-//            s = s + i;
-            s += i;
-        }*/
-        /*int[] array = new int[2];
-        for (int i = 0; i < array.length; i++) {
-
-        }*/
-        final int A = -3;
-        final int B = 0;
-        final int N = 2;
-        final int M = 2;
-
-        final int C = 1;
-//        boolean wasDivisionByZero = false;
-//        todo char
-//        todo[clear code] think about avoiding brackets
-        if ((A <= -C && -C <= N) || (B <= 0 && 0 <= M)) {
-            System.out.println("Division by zero!");
-            return;
-        }
-/*myLabel:*/for (int i = A; i <= N /*&& !wasDivisionByZero*/; i++) {
-            /*if (i + C == 0) { // todo optimize
-                System.out.println("Division by zero!");
-                wasDivisionByZero = true;
-                break; //todo flag vs return;
-            }*/
-            for (int j = B; j <= M; j++) {
-                /*if (j == 0) {
-                    System.out.println("Division by zero!");
-                    return;
-//                    wasDivisionByZero = true;
-//                    break myLabel;
-                }*/
-                s += (double) (i / j) / (i + C);
-            }
-        }
-//        if (!wasDivisionByZero) {
-            System.out.println("s = " + s);
-//        }
-    }
-}

src/Lab2.java

@@ -1,102 +0,0 @@
-public class Lab2 {
-    public static void main(String[] args) {
-        final int A = 2;
-        final int[][] MATRIX_B = {
-                {1, 202, 1, 1, 202, 3, 1, 202, 3,},
-                {1, 202, 1, 1, 202, 3, 1, 202, 3,},
-                {1, 1,   3, 1, 202, 3, 1, 202, 3,},
-//                {4, 5, 6,},
-        };
-
-        int[][] MATRIX_C = multiplication(A, MATRIX_B);
-
-        print(MATRIX_C);
-
-        System.out.println("Sum of smallest elements in every column: " + sumOfSmallestElementsInEveryColumn(MATRIX_C));
-
-        /*int[] array = {1, 2, 3};
-        int[] array2 = new int[3];
-        Object[] array3 = new String[3];
-        System.out.println(array3[0]); //nothing, trash from the memory, null || null
-        System.out.println(array2[0]); //nothing, trash from the memory, null || 0
-        System.out.println(array[0]); // || 1
-
-        int[][] matrix2 = new int[2][3];
-        matrix2[0] = new int[2];
-        matrix2[1] = new int[1];
-        for (int i = 0; i < array.length; i++) {
-            if (i % 2 == 0) {
-                System.out.println("!" + array[i]);
-            } else {
-                System.out.println("?" + array[i]);
-            }
-        }
-
-        for (int i = 0; i < array.length; i+=2) {
-            System.out.println("!" + array[i]);
-        }
-
-        for (int i = 1; i < array.length; i+=2) {
-            System.out.println("?" + array[i]);
-        }
-
-//        зубчасті матриці
-        int[][] matrix = {
-                {1, 2},
-                {3}
-        };
-
-//        C=a×B, a - const
-
-
-//        final int[][] MATRIX_C = int;
-
-
-        MATRIX_B[0][0] = 2;
-        MATRIX_B[0] = new int[]{1, 2};
-        System.out.println(MATRIX_B[0][0]);
-        MATRIX_B = new int[][]{
-                {1, 2},
-                {3}
-        };*/
-    }
-
-    private static int sumOfSmallestElementsInEveryColumn(final int[][] MATRIX_C) {
-//        todo check different length of rows
-//        todo try to change i and j
-//        todo check repetition of minimal elements
-        int sum = 0;
-        for (int i = 0; i < MATRIX_C[0].length; i++) {
-            int tmpSmallest = MATRIX_C[0][i];
-            for (int j = 1; j < MATRIX_C.length; j++) {
-                if (MATRIX_C[j][i] < tmpSmallest) {
-                    tmpSmallest = MATRIX_C[j][i];
-                }
-            }
-            sum += tmpSmallest;
-        }
-        return sum;
-    }
-
-    private static void print(final int[][] MATRIX_C) {
-        for (int i = 0; i < MATRIX_C.length; i++) {
-            for (int j = 0; j < MATRIX_C[i].length; j++) {
-//                System.out.print(MATRIX_C[i][j] + "\t");//printf("%4d",
-                System.out.printf("%4d ", MATRIX_C[i][j]);//printf("%4d",
-            }
-            System.out.println();
-        }
-    }
-
-    private static int[][] multiplication(int A, final int[][] MATRIX_B) {
-        final int[][] MATRIX_C = new int[MATRIX_B.length][/*MATRIX_B[0].length*/]; // todo !!!DANGER different lengths of rows
-//        final int[][] MATRIX_C = MATRIX_B;
-        for (int i = 0; i < MATRIX_B.length; i++) {
-            MATRIX_C[i] = new int[MATRIX_B[i].length];
-            for (int j = 0; j < MATRIX_B[i].length; j++) {
-                MATRIX_C[i][j] = MATRIX_B[i][j] * A;
-            }
-        }
-        return MATRIX_C;
-    }
-}

src/Main.java

@@ -1,35 +1,8 @@
 public class Main {
     public static void main(String[] args) {
-        System.out.println(args[2]);
+        System.out.println(args[1]);
         System.out.println("Hello world!");
 //        System.out.println(1);
-
-        int a = 1;
-        int b = 2;
-        int c = 1;
-        int d = 1;
-
-        System.out.println(2&1);
-        System.out.println(2|1);
-        int aa = 2;
-
-        /*if (aa) {
-
-        }*/
-
-//        System.out.println("a"&"b");
-        System.out.println('a'&'b');
-
-        if ((a > b) & MyBooleanMethod()) {
-            System.out.println("?????????????????????????");
-        }
-
-
-    }
-
-    static boolean MyBooleanMethod() {
-        System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
-        return true;
     }
 
     void myFunction() {

src/encapsulationInheritancePolymorphism/inheritance/ElectricEngine.java

@@ -2,8 +2,4 @@ package encapsulationInheritancePolymorphism.inheritance;
 
 public class ElectricEngine extends Engine {
     private String batteryType;
-
-    /*private class Engine {
-        private int power;
-    }*/
 }

src/encapsulationInheritancePolymorphism/inheritance/FuelEngine.java

@@ -1,5 +0,0 @@
-package encapsulationInheritancePolymorphism.inheritance;
-
-public class FuelEngine extends Engine {
-    private String fuelType;
-}

src/encapsulationInheritancePolymorphism/inheritance/Main.java

@@ -2,7 +2,6 @@ package encapsulationInheritancePolymorphism.inheritance;
 
 public class Main {
     public static void main(String[] args) {
-        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        ElectricEngine electricEngine = new ElectricEngine();
-        FuelEngine fuelEngine = new FuelEngine();
     }
 }

src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java

@@ -1,14 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism;
-
-public class ElectricEngine extends Engine {
-    private String batteryType;
-
-    @Override
-    public int getPower() {
-        return 20;
-    }
-
-    /*private class Engine {
-        private int power;
-    }*/
-}

src/encapsulationInheritancePolymorphism/polymorphism/Engine.java

@@ -1,9 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism;
-
-public class Engine {
-    private int power;
-
-    public int getPower() {
-        return power;
-    }
-}

src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java

@@ -1,10 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism;
-
-public class FuelEngine extends Engine {
-    private String fuelType;
-
-    @Override
-    public int getPower() {
-        return 50;
-    }
-}

src/encapsulationInheritancePolymorphism/polymorphism/Main.java

@@ -1,38 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism;
-
-/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
-import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
-
-public class Main {
-    public static void main(String[] args) {
-        /*encapsulationInheritancePolymorphism.inheritance.*/ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
-        /*encapsulationInheritancePolymorphism.inheritance.*/FuelEngine fuelEngine = new FuelEngine();
-
-        Engine engine1 = fuelEngine;
-
-        Engine[] engines = {
-                electricEngine,
-                fuelEngine
-        };
-
-        for (Engine engine : engines) {
-            System.out.println(engine.getPower());
-        }
-
-        /*for (int i = 0; i < engines.length; i++) {
-            System.out.println(engines[i].getPower());
-        }*/
-
-//        +
-        int a = 1;
-        int b = 1;
-        int c = a + b;
-        System.out.println(c);
-
-
-        String sA = "1";
-        String sB = "1";
-        String sC = sA + sB;
-        System.out.println(sC);
-    }
-}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java

@@ -1,19 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism.enhanced;
-
-public class ElectricEngine extends Engine {
-    private String batteryType;
-    private int chargeLevel = 9;
-    private int criticalChargeLevel = 10;
-    private float coefficientCriticalPowerCut = 0.1f;
-
-    @Override
-    public int getPower() {
-        return chargeLevel > criticalChargeLevel
-                ? super.getPower()
-                : (int) (super.getPower() * coefficientCriticalPowerCut);
-    }
-
-    /*private class Engine {
-        private int power;
-    }*/
-}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java

@@ -1,9 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism.enhanced;
-
-public class Engine {
-    private int power = 100;
-
-    public int getPower() {
-        return power;
-    }
-}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java

@@ -1,10 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism.enhanced;
-
-public class FuelEngine extends Engine {
-    private String fuelType;
-
-    /*public int getPower() {
-        return 50;
-    }*/
-
-}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java

@@ -1,28 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism.enhanced;
-
-/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
-import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
-
-public class Main {
-    public static void main(String[] args) {
-        /*encapsulationInheritancePolymorphism.inheritance.*/
-        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
-        /*encapsulationInheritancePolymorphism.inheritance.*/
-        FuelEngine fuelEngine = new FuelEngine();
-
-        Engine engine1 = fuelEngine;
-
-        Engine[] engines = {
-                electricEngine,
-                fuelEngine
-        };
-
-        for (Engine engine : engines) {
-            System.out.println(engine.getPower());
-        }
-
-        /*for (int i = 0; i < engines.length; i++) {
-            System.out.println(engines[i].getPower());
-        }*/
-    }
-}

src/encapsulationInheritancePolymorphism/polymorphism/overload/MyClassForOverloadExample.java

@@ -1,17 +0,0 @@
-package encapsulationInheritancePolymorphism.polymorphism.overload;
-
-public class MyClassForOverloadExample {
-    void myMethod(int a) {
-        System.out.println("Integer: " + a);
-    }
-
-    void myMethod(double a) {
-        System.out.println("Double: " + a);
-    }
-
-    public static void main(String[] args) {
-        MyClassForOverloadExample overload = new MyClassForOverloadExample();
-        overload.myMethod(1);
-        overload.myMethod(0.1);
-    }
-}