Update lab4

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);
+        }
+    }
+}

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);
+    }
+}
+

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());
+        }
+    }
+}

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/Main.java

@@ -1,6 +1,6 @@
 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);
     }

src/encapsulationInheritancePolymorphism/inheritance/ElectricEngine.java

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

src/encapsulationInheritancePolymorphism/inheritance/Engine.java

@@ -0,0 +1,5 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class Engine {
+    private int power;
+}

src/encapsulationInheritancePolymorphism/inheritance/Main.java

@@ -0,0 +1,7 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class Main {
+    public static void main(String[] args) {
+        ElectricEngine electricEngine = new ElectricEngine();
+    }
+}