update lab4

Lab2: remove duplicate string to fix calculations

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_18" default="true" project-jdk-name="openjdk-18" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab1/Lab1.java

@@ -1,43 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab1;
-
-import java.util.Scanner;
-
-public class Lab1 {
-    public static void main(String[] args) {
-//        O1 = +
-//        C = 2
-//        O2 = %
-//        i, j = short(-32.768 to 32.768)
-        final int c = 2;
-        double result = 0;
-        Scanner scan = new Scanner(System.in);
-        System.out.print("Enter a: ");
-        int a = scan.nextInt();// Entering a
-        System.out.print("Enter b: ");
-        int b = scan.nextInt();// Entering b
-        System.out.print("Enter n: ");
-        int n = scan.nextInt();// Entering n
-        System.out.print("Enter m: ");
-        int m = scan.nextInt();// Entering m
-        scan.close();
-
-        if (a <= -c && n >= -c || b <= 0 && m >= 0) {
-            System.out.println("Error! Division by zero");
-            return;
-        }
-        else if(a > n || b > m){
-            result = 0;
-            System.out.println(result);
-            return;
-        }
-
-        for (short i = (short) a; i <= n; i++) {
-            for (short j = (short) b; j <= m; j++) {
-                result += (double) (i % j) / (i + c); //Calculation of the result
-            }
-        }
-        System.out.println("\ns = " + result); // Outputting the result
-
-    }
-}
-

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab2/Lab2.java

@@ -1,84 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab2;
-
-import java.util.Scanner;
-
-public class Lab2 {
-    public static void main(String[] args) {
-//        C5 = 2
-//        C7 = 1
-//        C11 = 4
-        Scanner scan = new Scanner(System.in);
-        System.out.print("Enter the number of matrix rows: ");
-        int m = scan.nextInt();
-        System.out.print("Enter the number of matrix columns: ");
-        int n = scan.nextInt();
-
-        System.out.println("\nFilling matrix A:");
-        byte[][] matrixA = new byte[m][n]; // Creating MxN matrix A
-        scanMatrix(matrixA, scan);
-
-        System.out.println("\nMatrix A"); // Printing matrix A
-        printMatrix(matrixA);
-
-        System.out.println("\nFilling matrix B:");
-        byte[][] matrixB = new byte[m][n];// Creating MxN matrix B
-        scanMatrix(matrixB, scan);
-
-        scan.close();
-
-        System.out.println("\nMatrix B:");// Printing matrix B
-        printMatrix(matrixB);
-
-        System.out.println("\nMatrix C:");
-        byte[][] matrixC = new byte[m][n];// Creating matrix C
-        for (byte i = 0; i < m; i++) {
-            for (byte j = 0; j < n; j++) {
-                matrixC[i][j] = (byte) (matrixA[i][j] + matrixB[i][j]);
-                System.out.print(matrixC[i][j] + "\t ");
-            }
-            System.out.println();
-        }
-
-        byte evenSum = 0; // Sum for the largest numbers in even rows
-        byte oddSum = 0;// Sum for the smallest numbers in even rows
-
-        for (byte i = 0; i < matrixC.length; i++) {
-            byte largest = Byte.MIN_VALUE; // variable for largest element
-            byte smallest = Byte.MAX_VALUE;// variable for smallest element
-            for (byte j = 0; j < matrixC[i].length; j++) {
-                if (i % 2 == 0) {
-                    smallest = (byte) Math.min(smallest, matrixC[i][j]);
-                } else {
-                    largest = (byte) Math.max(largest, matrixC[i][j]);
-                }
-            }
-            if (i % 2 == 0) {
-                oddSum += smallest;
-            } else {
-                evenSum += largest;
-            }
-        }
-
-        System.out.println("\nSum of the biggest elements: " + evenSum);
-        System.out.println("Sum of the smallest elements: " + oddSum);
-    }
-
-    private static void scanMatrix(byte[][] matrix, Scanner scan) { //Method for filling matrix
-        for (byte i = 0; i < matrix.length; i++) {
-            for (byte j = 0; j < matrix[i].length; j++) {
-                System.out.printf("Enter element [%d][%d]", i, i);
-                matrix[i][j] = scan.nextByte();
-            }
-        }
-    }
-
-    private static void printMatrix(byte[][] matrix) {//Method for printing matrix
-        for (byte[] row : matrix) {
-            for (byte el : row) {
-                System.out.print(el + "\t ");
-            }
-            System.out.println();
-        }
-    }
-}
-

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab3/Lab3.java

@@ -1,25 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab3;
-
-import java.util.*;
-
-public class Lab3 {
-    // String
-    // Надрукувати слова без повторень заданого тексту в алфавітному порядку за першою літерою.
-
-    public static void main(String[] args) {
-        String text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Mauris a diam maecenas sed enim ut sem viverra. Amet est placerat in egestas erat imperdiet. Sed turpis tincidunt id aliquet risus. Amet porttitor eget dolor morbi non arcu risus quis. Elementum nibh tellus molestie nunc non blandit massa. Feugiat scelerisque varius morbi enim nunc faucibus. Ipsum faucibus vitae aliquet nec ullamcorper sit amet risus nullam. Quis enim lobortis scelerisque fermentum dui faucibus in. Sem viverra aliquet eget sit amet tellus cras adipiscing enim. Sed ullamcorper morbi tincidunt ornare. Sodales ut eu sem integer vitae justo eget magna. Mi ipsum faucibus vitae aliquet nec ullamcorper.";
-        String[] words = text.split("[\\p{Punct}\\s]+");
-        List<String> wordList = new ArrayList<>(Arrays.asList(words));//Class ArrayList implements interface List
-        // asList returns immutable list
-        Set<String> wordSet = new HashSet<>(wordList);// Class HashSet implements interface Set
-        wordList.clear();
-        wordList.addAll(wordSet);
-        wordList.sort(String::compareToIgnoreCase);
-        wordList.sort((o1, o2) -> o1.compareToIgnoreCase(o2));
-
-        for (String element : wordList) {
-            System.out.println(element);
-        }
-    }
-}
-

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab4/Boat.java

@@ -1,34 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab4;
-
-/**
- * Class that represents a boat with different characteristics.
- */
-public class Boat {
-    private final String name;
-    private final int price;
-    private final int mass;
-    private final int age;
-    private final String type;
-
-    public Boat(String name, int price, int mass, int age, String type) {
-        this.name = name;
-        this.price = price;
-        this.mass = mass;
-        this.age = age;
-        this.type = type;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public int getPrice() {
-        return price;
-    }
-
-    @Override
-    public String toString() {
-        return String.format("%s - %s, which was built %d years ago, with mass - %d kg, has price - %d$;",
-                type, name, age, mass, price);
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab4/Lab4.java

@@ -1,35 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab4;
-
-import java.util.Arrays;
-import java.util.Comparator;
-import java.util.List;
-
-public class Lab4 {
-    public static void main(String[] args) {
-        List<Boat> boatList = Arrays.asList(
-                new Boat("Row V. Wave", 150000, 50000, 25, "cutter"),
-                new Boat("Dirty Oar", 250000, 40000, 15, "cutter"),
-                new Boat("Tumeric", 450000, 100000, 45, "cutter"),
-                new Boat("Life is Good", 350000, 20000, 5, "cutter")
-        );
-
-        boatList.sort(Comparator.comparing(Boat::getName));// comparing - method of Comparator interface
-        System.out.println("Sorted by name:");
-        printed(boatList);
-
-        boatList.sort(Comparator.comparing(Boat::getPrice).reversed());
-        System.out.println("\nSorted by price in reverse order:");
-        printed(boatList);
-    }
-
-    /**
-     * Print all characteristics of boats.
-     *
-     * @param boatList List of boats.
-     */
-    public static void printed(List<Boat> boatList) {
-        for (Boat boat : boatList) {
-            System.out.println(boat);
-        }
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Lab5.java

@@ -1,12 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-import java.util.*;
-
-public class Lab5 {
-    public static void main(String[] args) {
-        Text text = new Text("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Mauris a diam maecenas sed enim ut sem viverra. Amet est placerat in egestas erat imperdiet. Sed turpis tincidunt id aliquet risus. Amet porttitor eget dolor morbi non arcu risus quis. Elementum nibh tellus molestie nunc non blandit massa. Feugiat scelerisque varius morbi enim nunc faucibus. Ipsum faucibus vitae aliquet nec ullamcorper sit amet risus nullam. Quis enim lobortis scelerisque fermentum dui faucibus in. Sem viverra aliquet eget sit amet tellus cras adipiscing enim. Sed ullamcorper morbi tincidunt ornare. Sodales ut eu sem integer vitae justo eget magna. Mi ipsum faucibus vitae aliquet nec ullamcorper.");
-        System.out.println(text);
-        text.getSortedWordsByFirstLetter();
-    }
-
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Letter.java

@@ -1,14 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-public class Letter {
-    private final char character;
-
-    public Letter(char character) {
-        this.character = character;
-    }
-
-    @Override
-    public String toString() {
-        return String.valueOf(character);
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Punctuation.java

@@ -1,14 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-public class Punctuation implements SentenceElement {
-    private final String character;
-
-    public Punctuation(String character) {
-        this.character = character;
-    }
-
-    @Override
-    public String toString() {
-        return character;
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Sentence.java

@@ -1,55 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-import java.util.Arrays;
-import java.util.HashSet;
-
-public class Sentence {
-    private final SentenceElement[] sentenceElements;
-    private static final String PUNCTUATION = "\\p{Punct}";
-
-    public Sentence(String sentences) {
-        String[] sentenceElement = sentences.split("(?=" + PUNCTUATION + ")| ");
-        sentenceElements = new SentenceElement[sentenceElement.length];
-        for (int i = 0; i < sentenceElement.length; i++) {
-            if (sentenceElement[i].matches(PUNCTUATION)) {
-                sentenceElements[i] = new Punctuation(sentenceElement[i]);
-            } else {
-                sentenceElements[i] = new Word(sentenceElement[i]);
-            }
-        }
-    }
-
-    public static void getSortedWordsByFirstLetter(Sentence[] sentences) {
-        StringBuilder allWords = new StringBuilder();
-        for (Sentence sentence : sentences) {
-            allWords.append(sentence).append(" ");
-        }
-
-        String[] words = allWords.toString().split("\\W+");
-
-        HashSet<String> uniqueWords = new HashSet<>();
-
-        for (String word : words) {
-            uniqueWords.add(word.toLowerCase());
-        }
-
-        String[] uniqueSortedWords = uniqueWords.toArray(new String[0]);
-
-        Arrays.sort(uniqueSortedWords);
-
-        for (String word : uniqueSortedWords) {
-            System.out.println(word);
-        }
-    }
-    @Override
-    public String toString() {
-        StringBuilder out = new StringBuilder();
-        for (SentenceElement se : sentenceElements) {
-            if (se.getClass().isAssignableFrom(Word.class)) {
-                out.append(" ");
-            }
-            out.append(se);
-        }
-        return out.toString();
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/SentenceElement.java

@@ -1,5 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-public interface SentenceElement {
-    // Об'єднуєм два типа
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Text.java

@@ -1,26 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-public class Text {
-    private final Sentence[] sentences;
-
-    public Text(String text) {
-        String[] splitText = text.split("(?=[.!?]+)| ");
-        sentences = new Sentence[splitText.length];
-        for (int i = 0; i < splitText.length; i++) {
-            sentences[i] = new Sentence(splitText[i]);
-        }
-    }
-
-    public void getSortedWordsByFirstLetter() {
-        Sentence.getSortedWordsByFirstLetter(sentences);
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder out = new StringBuilder();
-        for (Sentence sentence : sentences) {
-            out.append(sentence.toString());
-        }
-        return out.toString().strip();
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab5/Word.java

@@ -1,21 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab5;
-
-public class Word implements SentenceElement {
-    private final Letter[] letters;
-
-    public Word(String word) {
-        letters = new Letter[word.length()];
-        for (int i = 0; i < word.length(); i++) {
-            letters[i] = new Letter(word.charAt(i));
-        }
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder out = new StringBuilder();
-        for (Letter let : letters) {
-            out.append(let.toString());
-        }
-        return out.toString();
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab6/Comfort.java

@@ -1,7 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab6;
-
-public class Comfort extends Tariff {
-    public Comfort(String name, int price, int customers) {
-        super(name, price, customers);
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab6/Economy.java

@@ -1,8 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab6;
-
-public class Economy extends Tariff {
-
-    public Economy(String name, int price, int customers) {
-        super(name, price, customers);
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab6/Lab6.java

@@ -1,48 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab6;
-
-import java.util.Arrays;
-import java.util.Comparator;
-import java.util.Scanner;
-
-public class Lab6 {
-    public static void main(String[] args) {
-        Comfort tariff1 = new Comfort("Comfort", 100, 5000);
-        Economy tariff2 = new Economy("Economy", 25, 10000);
-        Optimal tariff3 = new Optimal("Optimal", 300, 50000);
-
-        Tariff[] tariffs = {tariff1, tariff2, tariff3};
-        int sum = 0;
-        System.out.println("Тарифи мобільної мобільної компанії:");
-        for (int i = 0; i < tariffs.length; i++) {
-            System.out.printf("\t%d. %s%n", i + 1, tariffs[i].getName());
-            sum += tariffs[i].getCustomers();
-        }
-        System.out.println("\nЗагальна кількість користувачів: " + sum + ";");
-
-        System.out.println("\nТарифи мобільної компанії відсортовані за вартістю:");
-        Arrays.sort(tariffs, Comparator.comparing(Tariff::getPrice));
-        for (int i = 0; i < tariffs.length; i++) {
-            System.out.printf("\t%d. %s%n", i + 1, tariffs[i]);
-        }
-        System.out.println("\nВведіть діапазон цін, в якому бажаєте підібрати тариф: ");
-
-        Scanner scan = new Scanner(System.in);
-        System.out.print("\tМінімальна ціна: ");
-        int minSum = scan.nextInt();
-        System.out.print("\tМаксимальна ціна: ");
-        int maxSum = scan.nextInt();
-        scan.close();
-        int n2 = 0;
-
-        System.out.println("\nПідібрані тарифи: ");
-        for (int i = 0; i < tariffs.length; i++) {
-            if (minSum <= tariffs[i].getPrice() && tariffs[i].getPrice() <= maxSum) {
-                System.out.printf("\t%d. %s%n", i + 1, tariffs[i]);
-                n2 += 1;
-            }
-        }
-        if (n2 == 0) {
-            System.out.println("\tНе знайдено тарифів в заданому діапазоні цін;");
-        }
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab6/Optimal.java

@@ -1,7 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab6;
-
-public class Optimal extends Tariff {
-    public Optimal(String name, int price, int customers) {
-        super(name, price, customers);
-    }
-}

src/IO_24/_02_Бондаренко_Тарас_Андрійович/lab6/Tariff.java

@@ -1,30 +0,0 @@
-package IO_24._02_Бондаренко_Тарас_Андрійович.lab6;
-
-public class Tariff {
-    private final String name;
-    private final int price;
-    private final int customers;
-
-    public Tariff(String name, int price, int customers) {
-        this.name = name;
-        this.price = price;
-        this.customers = customers;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public int getPrice() {
-        return price;
-    }
-
-    public int getCustomers() {
-        return customers;
-    }
-
-    @Override
-    public String toString() {
-        return "Тариф " + name + ", коштує " + price + " грн.";
-    }
-}

src/Lab1.java

@@ -0,0 +1,58 @@
+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) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> i = 1, 2) <20><><EFBFBD><EFBFBD> <20> <= 3, 3) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 䳿 <20> <20><> <20><><EFBFBD><EFBFBD><EFBFBD>,
+            System.out.println(i);     // 4) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><> 1, 5) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD> 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

@@ -0,0 +1,139 @@
+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, 4},
+                {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));
+        try {
+            System.out.println("Sum of smallest elements in every column: " + sumOfSmallestElementsInEveryColumnRenew(MATRIX_C));
+            System.out.println("???...");
+        } catch (Exception e) {
+            System.err.println(e.getMessage());
+        }
+
+        System.out.println("I'm still working...");
+
+        /*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 int sumOfSmallestElementsInEveryColumnRenew(final int[][] MATRIX_C) throws Exception {
+//        todo check different length of rows
+        for (int i = 1; i < MATRIX_C.length; i++) {
+            if (MATRIX_C[i].length != MATRIX_C[0].length) {
+                throw new /*Runtime*/Exception("There are different lengths of matrix rows.");
+//                System.err.println("There are different lengths of matrix rows.");
+//                System.exit(0);
+            }
+        }
+        int sum = 0;
+        for (int j = 0; j < MATRIX_C[0].length; j++) {
+            int tmpSmallest = MATRIX_C[0][j];
+            boolean valueRepeats = false;
+            for (int i = 1; i < MATRIX_C.length; i++) {
+                if (MATRIX_C[i][j] < tmpSmallest) {
+                    tmpSmallest = MATRIX_C[i][j];
+                    valueRepeats = false;
+                } else if (MATRIX_C[i][j] == tmpSmallest) {
+                    valueRepeats = true;
+                }
+            }
+
+            if (!valueRepeats) {
+                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

@@ -1,8 +1,35 @@
 public class Main {
     public static void main(String[] args) {
-        System.out.println(args[1]);
+        System.out.println(args[2]);
         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

@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+
+    /*private class Engine {
+        private int power;
+    }*/
+}

src/encapsulationInheritancePolymorphism/inheritance/Engine.java

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

src/encapsulationInheritancePolymorphism/inheritance/FuelEngine.java

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

src/encapsulationInheritancePolymorphism/inheritance/Main.java

@@ -0,0 +1,8 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class Main {
+    public static void main(String[] args) {
+        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        FuelEngine fuelEngine = new FuelEngine();
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java

@@ -0,0 +1,14 @@
+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

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

src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java

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

src/encapsulationInheritancePolymorphism/polymorphism/Main.java

@@ -0,0 +1,38 @@
+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

@@ -0,0 +1,19 @@
+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

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

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java

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

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java

@@ -0,0 +1,28 @@
+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

@@ -0,0 +1,17 @@
+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);
+    }
+}

src/lab3/Lab3.java

@@ -0,0 +1,75 @@
+package lab3;
+
+public class Lab3 {
+    private static final int REPETITION_NUMBER = 10;
+    public static void main(String[] args) {
+        StringBuilder result = new StringBuilder();
+        for (int i = 0; i < REPETITION_NUMBER; i++) {
+//            result += Integer.toString(i);
+//            result += String.valueOf(i);
+            result.append(i);
+        }
+
+
+
+        /*float f = 1.1f;
+        double d = 2.2;
+//        f = (float) (f + d);
+        f += d;*/
+
+        String s = "ASD";
+
+        StringBuilder stringBuilder = new StringBuilder("ASD");
+        StringBuffer stringBuffer = new StringBuffer("ASD");
+
+        stringBuilder.append("A");
+        System.out.println(s.length());
+        System.out.println(stringBuilder.length());
+        System.out.println(stringBuffer.length());
+
+        System.out.println(s.endsWith("D"));
+//        System.out.println(stringBuilder.substring(stringBuilder.length() - 1).equals("A"));
+        System.out.println("A".equals(stringBuilder.substring(stringBuilder.length() - 1)));
+        System.out.println("A".equals(stringBuffer.substring(stringBuffer.length() - 1)));
+
+        String sNull = null;
+        System.out.println("A".equals(sNull));
+        System.out.println(sNull.equals("A"));
+
+        System.out.println(s.substring(2));
+        System.out.println(s.contains("AS"));
+
+        System.out.println(s.indexOf('a'));
+
+//        System.out.println(s.charAt(-1));
+
+        System.out.println("s.equalsIgnoreCase(\"AsD\") = " + s.equalsIgnoreCase("AsD"));
+
+        String s2 = s;
+        System.out.println("s2 = " + s2);
+        System.out.println(s == s2); // true?
+        System.out.println(s.equals(s2)); // true?
+        s += "B";
+        System.out.println(s);
+        System.out.println("s2 = " + s2);
+
+        System.out.println(s == s2); // false?
+        System.out.println(s.equals(s2)); // false?
+
+        String s3 = new String("ASD");
+        System.out.println(s3 == s2); // true? (false)
+        System.out.println(s3.equals(s2)); // false? (true)
+
+//      String Pool
+        String s4 = "ASD";
+//        String s5 = new String("ASD");
+        String s5 = "AS";
+        s5 += "D";
+        System.out.println(s4 == s5); // true? (SP)
+        System.out.println(s4.equals(s5)); // (true)
+
+
+
+        System.out.println("Done!");
+    }
+}

src/lab3/Variant0.java

@@ -0,0 +1,66 @@
+package lab3;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * Знайти найбільшу кількість речень заданого тексту, в яких є однакові слова.
+ */
+public class Variant0 {
+    public static void main(String[] args) {
+        System.out.println("\\");
+        String textString = "Aa, a b. Bb a? B a! B a. Ccc.";
+//        final String[] sentencesStrings = textString.split("(?<=(\\.|!|\\?)) ");
+//        final String[] sentencesStrings = textString.split("(?<=[.!?]) ");
+        final String[] sentencesStrings = textString.split("[.!?] ?");
+        for (String sentencesString : sentencesStrings) {
+            System.out.println("[" + sentencesString + "]");
+        }
+        System.out.println("++++++++++++");
+
+        final String[][] wordsStringsBySentences = new String[sentencesStrings.length][];
+        for (int i = 0; i < sentencesStrings.length; i++) {
+            wordsStringsBySentences[i] = sentencesStrings[i].split(",? ");
+        }
+
+        for (String[] wordsStrings : wordsStringsBySentences) {
+            for (String wordsString : wordsStrings) {
+                System.out.print("[" + wordsString + "] - ");
+            }
+            System.out.println();
+        }
+
+        Set<String> originalWordsStrings = new HashSet();
+        for (String[] wordsStrings : wordsStringsBySentences) {
+            for (String wordsString : wordsStrings) {
+                originalWordsStrings.add(wordsString.toLowerCase());
+            }
+        }
+        final String[] originalWordsArray = originalWordsStrings.toArray(new String[0]);
+
+        System.out.println("++++++++++++");
+        for (Object originalWordsString : originalWordsStrings) {
+            System.out.println(originalWordsString);
+        }
+
+        int[] entersQuantitiesOriginalWordsInSentences = new int[originalWordsArray.length];
+        for (int i = 0; i < originalWordsArray.length; i++) {
+            String originalWord = originalWordsArray[i];
+            for (String[] words : wordsStringsBySentences) {
+                for (String word : words) {
+                    if (originalWord.equalsIgnoreCase(word)) {
+                        entersQuantitiesOriginalWordsInSentences[i]++;
+                        break;
+                    }
+                }
+            }
+        }
+
+//        todo show greatest value from entersQuantitiesOriginalWordsInSentences
+
+//        System.out.println(Arrays.toString(sentencesStrings));
+        System.out.println("++++++++++++");
+    }
+}

src/lab4/Furniture.java

@@ -0,0 +1,77 @@
+package lab4;
+
+/**
+ * My class Furniture.
+ */
+public class Furniture<T> {
+    /**
+     *
+     */
+    private String material;
+    private int length;
+    private int height;
+    private int width;
+    private int price;
+
+    private T additional;
+
+    public void setAdditional(T additional) {
+        this.additional = additional;
+    }
+
+    /**
+     *
+     * @param material
+     * @param length
+     * @param height
+     * @param width
+     * @param price
+     */
+    public Furniture(String material, int length, int height, int width, int price) {
+//        this.material = material;
+        setMaterial(material);
+        this.length = length;
+        this.height = height;
+        this.width = width;
+        this.price = price;
+    }
+
+    public void setMaterial(String material) {
+        this.material = material;
+    }
+
+    public String getMaterial() {
+        return material;
+    }
+
+    public int getLength() {
+        return length;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    /*public Furniture() {
+
+    }*/
+
+    @Override
+    public String toString() {
+        return "Furniture{" +
+                "material='" + material + '\'' +
+                ", length=" + length +
+                ", height=" + height +
+                ", width=" + width +
+                ", price=" + price +
+                '}';
+    }
+}

src/lab4/Main.java

@@ -0,0 +1,45 @@
+package lab4;
+
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) {
+//        todo Comparable
+        //todo equals+hashcode
+//        todo JavaDoc
+        final Furniture<Furniture> furniture1 = new Furniture<>("A", 1, 1, 1, 1);
+        final Furniture<String> furniture2 = new Furniture<>("D", 1, 1, 1, 4);
+        Furniture[] furnitureArray = {
+                furniture1,
+                furniture2,
+            new Furniture("B", 1, 2, 1, 1),
+            new Furniture("C", 1, 1, 3, 1),
+        };
+
+        for (Furniture furniture : furnitureArray) {
+//            System.out.println(furniture.getMaterial() + " " + furniture.getPrice());
+            System.out.println(furniture);
+        }
+        System.out.println("+++++++++++++");
+
+        furniture1.setAdditional(new Furniture("Y", 1, 1, 1, 0));
+        furniture2.setAdditional("new Furniture(\"Y\", 1, 1, 1, 0)");
+
+//        furnitureArray[0].setMaterial("E");
+
+        Arrays.sort(furnitureArray, (o1, o2) -> o1.getMaterial().compareTo(o2.getMaterial()));
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");
+
+//        todo check
+        Arrays.sort(furnitureArray, (o1, o2) -> Integer.compare(o2.getPrice(), o1.getPrice()));
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");
+    }
+}

src/test/Test.java

@@ -0,0 +1,13 @@
+package test;
+
+public class Test {
+    public static void main(String[] args) {
+
+    }
+    static int m(){
+        System.exit(0);
+//        return 1;
+        System.out.println(123);
+        return 1;
+    }
+}

src/test/one/A.java

@@ -0,0 +1,7 @@
+package test.one;
+
+public class A implements MyMethodInterface {
+    public void myMethod() {
+
+    }
+}

src/test/one/B.java

@@ -0,0 +1,7 @@
+package test.one;
+
+public class B implements MyMethodInterface {
+    public void myMethod() {
+
+    }
+}

src/test/one/Main.java

@@ -0,0 +1,13 @@
+package test.one;
+
+public class Main {
+    public static void main(String[] args) {
+        Object[] objects = {
+                new A(),
+                new B(),
+        };
+        for (Object object : objects) {
+            ((MyMethodInterface)object).myMethod();
+        }
+    }
+}

src/test/one/MyMethodInterface.java

@@ -0,0 +1,5 @@
+package test.one;
+
+public interface MyMethodInterface {
+    void myMethod();
+}

test.txt

@@ -0,0 +1 @@
+Фів фіке фівлоафждіо хщшіоекдодлфіідваол фі