update lab4

Lab2: remove duplicate string to fix calculations

.gitignore

@@ -0,0 +1,2 @@
+# Project exclude paths
+/out/

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <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>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/OOP_IO-2x_2023.iml" filepath="$PROJECT_DIR$/OOP_IO-2x_2023.iml" />
+    </modules>
+  </component>
+</project>

.idea/uiDesigner.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.svg" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

Lab3/Lab2/Lab2/Program.cs

@@ -1,40 +0,0 @@
-using System;
-
-public class Laba2
-{
-    public static void Main(string[] args)
-    {
-        const int a = 2;
-        int[,] b = new[,] //створення матриці;
-        {
-             { 1, 2, 8 },
-             { 3, 4, 5 },
-             { 6, 7, 9 }
-        };
-        int rows = b.GetLength(0); //отримання довжини рядків
-        int cols = b.GetLength(1); //отримання довжини стовпців
-       for (int i = 0; i < rows; i++) 
-        {
-            int Avg = 0;
-            for (int j = 0; j < cols; j++)
-            {
-                Console.Write(b[i, j] + " ");      // перебір матриці для обчислення середнього значення рядка
-                Avg += b[i, j];
-            }
-            Avg = Avg / cols;
-            Console.Write($"-average of row is:{Avg};"  );
-            Console.WriteLine(" ");
-          
-        }
-       Console.WriteLine(" ");
-       for (int x = 0; x < rows; x++)
-       {
-           for (int y = 0; y < cols; y++)
-           {
-               Console.Write(b[x, y] * a + " "); //виведення матриці, помноженої на константу
-
-           }
-           Console.WriteLine(" ");
-       }
-    }
-}

Lab3/Lab3/Lab3/Program.cs

@@ -1,33 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-class Lab3
-{
-    public static void Main(string[] args)
-    {
-        string text = "Вухатий великий синiй слон. Яблуко в саду. Зелене яблуко? Груша. Жовта слива висить у саду!";
-        Console.WriteLine(text );
-
-        // розділяємо текст на окремі речення
-        string[] textSplit = text.Split(new[] { '.', '?', '!' }, StringSplitOptions.RemoveEmptyEntries);
-
-        // обчислюємо кількість слів у кожному реченні та створюємо масив з кількістю слів у реченнях
-        int[] amountOfWords = new int[textSplit.Length];
-        for (int i = 0; i < textSplit.Length; i++)
-        {
-            string[] words = textSplit[i].Trim().Split(' ', StringSplitOptions.RemoveEmptyEntries);
-            amountOfWords[i] = words.Length;
-        }
-
-        // створюємо Dictionary, де ключ - кількість слів у реченні, а значення - речення
-        Dictionary<string, int> sentenceDictionary = new Dictionary<string, int>();
-        for (int i = 0; i < textSplit.Length; i++)
-        {
-            sentenceDictionary.Add(textSplit[i],amountOfWords[i] );
-        }
-        var sortedDict = sentenceDictionary.OrderBy(x => x.Value).ToDictionary(x => x.Key, x => x.Value);
-
-
-        Console.WriteLine(String.Join(";", sortedDict.Keys));
-    }
-}

Lab3/Lab4/Lab4/Program.cs

@@ -1,86 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace ConsoleApp1
-{
-    class Furniture
-    {
-        // 5 полів
-        private string type;
-        private string material;
-        private string color;
-        private int price;
-        private int amount;
-
-        // конструктор з атрибутами
-        public Furniture(string type, string material, string color, int price, int amount)
-        {
-            this.type = type;
-            this.material = material;
-            this.color = color;
-            this.price = price;
-            this.amount = amount;
-        }
-
-        // методи для повернення атрибутів
-        public string getType()
-        {
-            return type;
-        }
-
-        public string getMaterial()
-        {
-            return material;
-        }
-
-        public string getColor()
-        {
-            return color;
-        }
-
-        public int getPrice()
-        {
-            return price;
-        }
-
-        public int getAmount()
-        {
-            return amount;
-        }
-
-        public static void Main(string[] args)
-        {
-
-            Furniture[] furnitureArr = {
-                new Furniture("шафа", "дерево", "коричневий", 5000, 2),
-                new Furniture("стiл", "скло", "чорний", 3000, 3),
-                new Furniture("лiжко", "метал", "срiблястий", 8000, 1),
-                new Furniture("диван", "тканина", "сiрий", 10000, 2),
-                new Furniture("стiлець", "метал", "синій", 500, 4)
-            };
-
-
-            // Сортування масиву за ціною за зростанням
-            var sorted = furnitureArr.OrderBy(ob => ob.price).ToArray();
-            // Вивести відсортований масив
-            Console.WriteLine("Вiдсортований за цiною (за зростанням):");
-            foreach (Furniture f in sorted)
-            {
-                Console.WriteLine(f.getType() + " - " + f.getPrice() + " грн;");
-            }
-            Console.WriteLine(' ');
-            // Сортування масиву за кількістю за спаданням
-            var sortedReversery = furnitureArr.OrderBy(ob => ob.amount).ToArray().Reverse();
-            // Вивести відсортований масив
-            Console.WriteLine("Вiдсортований за кiлькiстю (за спаданням):");
-            foreach (Furniture f in sortedReversery)
-            {
-                Console.Write($"{f.getType()} - {f.getAmount()}; " );
-            }
-            Console.WriteLine(' ');
-        }
-    }
-}

Lab6/Lab6/Program.cs

@@ -1,121 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Formats.Asn1;
-
-// Визначити ієрархію рухомого складу залізничного транспорту.Створити пасажирський потяг.Порахувати загальну чисельність пасажирів і багажу в потязі.
-// Провести сортування вагонів потягу за рівнем комфортності. Знайти вагон в потязі, що відповідає заданому діапазону кількості пасажирів.
-
-
-class Lab6
-{
-    public static void Main(string[] args)
-    {
-        List<Wagons> wagons = new List<Wagons>(); //створюємо лист-список вагонів;                      
-
-        // Додаємо вагони за допомогою класу Wagons;
-        wagons.Add(new Wagons.PassengerWagons("Пасажирський", 100, 100, "Вищий", 10));
-        wagons.Add(new Wagons.PassengerWagons("Пасажирський", 50, 48, "Середнiй", 20));
-        wagons.Add(new Wagons.PassengerWagons("Пасажирський", 20, 15, "Низький", 30));
-        wagons.Add(new Wagons.FreightWagons("Вантажний", 10, 10));
-        wagons.Add(new Wagons.FreightWagons("Вантажний", 20, 20));
-        wagons.Add(new Wagons.FreightWagons("Вантажний", 30, 30));
-
-        
-        Console.WriteLine("Усi вагони:");  //відображення всіх вагонів;
-
-        foreach (Wagons wagon in wagons)
-        {
-            Console.WriteLine(wagon.GetType() + ": " + wagon.GetPassengers() + " пасажирiв(-а), " + wagon.GetBaggage() +
-                              " валiз/контейнерiв, " + wagon.GetComfort() + ", " + wagon.GetAmount() + ";");
-        }
-
-        int amountOfPassangers = 0;  //обчислення загальної кількості пасажирів;
-        foreach (Wagons p in wagons)
-        {
-            amountOfPassangers += p.GetPassengers();
-        }
-
-        var sorted = wagons.OrderByDescending(ob => ob.GetComfort()).ToArray(); //сортування вагонів за рівнем комфорту;
-        
-        Console.WriteLine("\nКiлькiсть пасажирiв у пасажирському вагонi: " + amountOfPassangers + ";");
-        Console.WriteLine("\nВеддiть мiнiмальну кiлькiсть пасажирiв: ");
-        var minPassangers = Convert.ToInt32(Console.ReadLine());
-        Console.WriteLine("Веддiть максимальну кiлькiсть пасажирiв: ");
-        var maxPassangers = Convert.ToInt32(Console.ReadLine());
-        foreach (Wagons t in wagons)
-        {
-            if (t.GetPassengers() != null && t.GetPassengers() >= minPassangers && t.GetPassengers() <= maxPassangers) //пошук вагону за кількістю пасажирів;
-            {
-                Console.Write(t.GetType() + " - " + t.GetPassengers()+"; ");
-            }
-            else
-            {
-                throw (new InvalidOperationException("Немає такого вагону;"));
-                
-            }
-
-        }
-
-    }
-
-    class Wagons
-    {
-        private string type; // тип вагону
-        private int passengers; // кількість пасажирів
-        private int baggage; // кількість багажу в тоннах
-        private string comfort; // рейтиг комфорту вагону
-        private int amount; // кількість вагонів
-
-        public Wagons(string type, int? passengers, int? baggage, string comfort, int amount)   //конструктор вагонів;
-        {
-            this.type = type;
-            this.passengers = Convert.ToInt32(passengers);
-            this.baggage = Convert.ToInt32(baggage);
-            this.comfort = comfort;
-            this.amount = amount;
-        }
-
-        public string GetType()         //геттери атрибутів класу;
-        {
-            return type;
-        }
-
-        public int GetPassengers()
-        {
-            return passengers;
-        }
-
-        public int? GetBaggage()
-        {
-            return baggage;
-        }
-
-        public string GetComfort()
-        {
-            return comfort;
-        }
-
-        public int GetAmount()
-        {
-            return amount;
-        }
-
-        // підклас Пасажирський вагон який наслідує батьківський клас Вагони;
-        public class PassengerWagons : Wagons
-        {
-            public PassengerWagons(string type, int passengers, int baggage, string comfort, int amount) : base(type,
-                passengers, baggage, comfort, amount)
-            {
-            }
-        }
-
-        // підклас Вантажний вагон який наслідує батьківський клас Вагони;
-        public class FreightWagons : Wagons
-        {
-            public FreightWagons(string type, int baggage, int amount) : base(type, null, baggage, null, amount)
-            {
-            }
-        }
-    }
-}

OOP_IO-2x_2023.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

READ ME

@@ -1 +0,0 @@
-Files with lab2,3,4 located in in Lab3. My excuses for confusing you

src/Lab2.java

@@ -1,13 +1,44 @@
 public class Lab2 {
     public static void main(String[] args) {
-        int[] array = {1, 2, 3};
-        /*for (int i = 0; i < array.length; i++) {
+        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]);
@@ -22,5 +53,87 @@ public class Lab2 {
                 {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/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 +1,93 @@
+package lab4;
+
+
+///**
+// * My class Furniture.
+// */
+//todo uncomment /*<Furniture>*/
+public /*abstract*/ class Furniture/*<T>*/ implements Comparable<Furniture> {
+    /**
+     *
+     */
+    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 +
+                '}';
+    }
+
+//    @Override
+//    public int compareTo(Object o) {
+//        return /*this.*/price - ((Furniture) o).price;
+////        return /*this.*/material.compareTo(((Furniture) o).material);
+//    }
+
+    @Override
+    public int compareTo(Furniture o) {
+        final int priceDifference = price - o.price;
+        return priceDifference != 0
+                ? priceDifference
+//                : -material.compareTo(o.material);
+                : o.material.compareTo(material);
+    }
+}

src/lab4/Main.java

@@ -0,0 +1,84 @@
+package lab4;
+
+import java.util.Arrays;
+import java.util.Comparator;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println(Integer.MIN_VALUE - 1);
+        //todo equals+hashcode
+//        todo JavaDoc
+        final Furniture/*<Furniture>*/ furniture1 = new Furniture("A", 1, 1, 1, 1);
+        final Furniture/*<String>*/ furniture2 = new Furniture("F", 1, 1, 1, 4);
+
+        System.out.println(furniture1.compareTo(furniture2));
+//        System.out.println(furniture1.compareTo("furniture2"));
+
+        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("+++++++++++++");
+
+        /*Arrays.sort(furnitureArray);
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");*/
+
+        /*Arrays.sort(furnitureArray, new PriceFurnitureComparator());
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");*/
+
+        /*Arrays.sort(furnitureArray, new Comparator<Furniture>() {
+            @Override
+            public int compare(Furniture o1, Furniture o2) {
+                return o1.getMaterial().compareTo(o2.getMaterial());
+            }
+        });*/
+//        Arrays.sort(furnitureArray, (o1, o2) -> o1.getMaterial().compareTo(o2.getMaterial()));
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getMaterial));
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getMaterial).reversed());
+//        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getPrice)
+//        .thenComparing(Furniture::getMaterial).reversed());
+        Arrays.sort(furnitureArray, Comparator.comparing(Furniture::getPrice)
+                .thenComparing(Comparator.comparing(Furniture::getMaterial).reversed()));
+
+        for (Furniture furniture : furnitureArray) {
+            System.out.println(furniture);
+        }
+
+        System.out.println("+++++++++++++");
+    }
+}

src/lab4/MaterialFurnitureComparator.java

@@ -0,0 +1,11 @@
+package lab4;
+
+import java.util.Comparator;
+
+public class MaterialFurnitureComparator implements Comparator<Furniture> {
+
+    @Override
+    public int compare(Furniture o1, Furniture o2) {
+        return o1.getMaterial().compareTo(o2.getMaterial());
+    }
+}

src/lab4/PriceFurnitureComparator.java

@@ -0,0 +1,11 @@
+package lab4;
+
+import java.util.Comparator;
+
+public class PriceFurnitureComparator implements Comparator<Furniture> {
+
+    @Override
+    public int compare(Furniture o1, Furniture o2) {
+        return o1.getPrice() - o2.getPrice();
+    }
+}

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