Update Lab5.java

.gitignore

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

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="19" 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>

.idea/modules.xml

@@ -2,8 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/lab1.iml" filepath="$PROJECT_DIR$/lab1.iml" />
+      <module fileurl="file://$PROJECT_DIR$/OOP_IO-2x_2023.iml" filepath="$PROJECT_DIR$/OOP_IO-2x_2023.iml" />
-      <module fileurl="file://$PROJECT_DIR$/laba3/laba3.iml" filepath="$PROJECT_DIR$/laba3/laba3.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>

Lab4.java

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

Lab5.java

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

Students.java

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

lab1.java

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

lab2.java

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

lab3.java

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

laba3/laba3.iml

@@ -1,11 +0,0 @@
-<?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>

laba3/src/Main.java

@@ -1,93 +0,0 @@
-import java.util.Scanner;
-import java.util.ArrayList;
-import java.util.Collections;
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Введіть текст:");
-        Scanner scan = new Scanner(System.in);
-        String inputText = scan.nextLine();
-        StringBuilder text = new StringBuilder(inputText);
-        StringBuilder suz = new StringBuilder();
-        while (true){
-            if(text.isEmpty()){
-                break;
-            }
-            int index1 = text.indexOf(".");
-            int index2 = text.indexOf("!");
-
-            int index3 = text.indexOf("?");
-
-            int index4 = text.indexOf("...");
-
-            int[] array1= {index1, index2, index3, index4};
-            ArrayList<Integer> list = new ArrayList<Integer>();
-            for (int i = 0; i < array1.length; i++) {
-                if (array1[i] >= 0) {
-                    list.add(array1[i]);
-                }
-            }
-            int min = Collections.min(list);
-            String rechennya1 = text.substring(0, min);
-            System.out.println(rechennya1);
-            if (rechennya1.contains(" ")){
-                StringBuilder rechennya = new StringBuilder(rechennya1);
-                String firstword1;
-                String secondword1 = text.substring(rechennya.lastIndexOf(" ")+1, rechennya.length());
-                String secondword2;
-                secondword2 = secondword1.substring(0, 1).toUpperCase()+secondword1.substring(1, secondword1.length());
-                StringBuilder secondword = new StringBuilder(secondword2);
-                if(rechennya.charAt(rechennya.indexOf(" ")-1)==','){
-                    firstword1 = text.substring(0, rechennya.indexOf(" ")-1);
-                    secondword.append(",");
-                }
-                else {
-                    firstword1 = text.substring(0, rechennya.indexOf(" "));
-                }
-
-                String firstword2 = firstword1.substring(0, 1).toLowerCase()+firstword1.substring(1, firstword1.length());
-                StringBuilder firstword = new StringBuilder(firstword2);
-
-
-                firstword.insert(0, " ");
-                rechennya.delete(0, rechennya.indexOf(" "));
-                rechennya.insert(0, secondword);
-                rechennya.delete(rechennya.lastIndexOf(" "), rechennya.length());
-                rechennya.append(firstword);
-                if ((index1==index4)&&(index1==min)){
-                    rechennya.append(text.substring(min, min+3));
-                    rechennya.append(" ");
-                    text.delete(0, min+4);
-                }
-                else {
-                    rechennya.append(text.substring(min, min+1));
-                    rechennya.append(" ");
-                    text.delete(0, min+2);
-                }
-                suz.append(rechennya);
-            }
-            else {
-                StringBuilder rechennya = new StringBuilder(rechennya1);
-                if ((index1==index4)&&(index1==min)){
-                    rechennya.append(text.substring(min, min+3));
-                    rechennya.append(" ");
-                    text.delete(0, min+4);
-                }
-                else {
-                    rechennya.append(text.substring(min, min+1));
-                    rechennya.append(" ");
-                    text.delete(0, min+2);
-                }
-                suz.append(rechennya);
-            }
-
-
-
-
-
-
-
-
-        }
-        System.out.println(suz);
-    }
-}

laba4/Cosmetic.java

@@ -1,25 +0,0 @@
-import java.util.Random;
-public class Cosmetic {
-    public int price_in_$;
-    public int health_damage_from1to10;
-    public int attractiveness_from1to10;
-    public int quality_from1to10;
-    public int brightness_from1to10;
-
-    public Cosmetic() {
-        Random random = new Random();
-        this.price_in_$ = random.nextInt(1000) + 1;;
-        this.health_damage_from1to10 = random.nextInt(11);
-        this.attractiveness_from1to10 = random.nextInt(11);
-        this.quality_from1to10 = random.nextInt(11);
-        this.brightness_from1to10 = random.nextInt(11);
-    }
-
-    public Cosmetic(int price_in_$, int health_damage_from1to10, int attractiveness_from1to10, int quality_from1to10, int brightness_from1to10) {
-        this.price_in_$ = price_in_$;
-        this.health_damage_from1to10 = health_damage_from1to10;
-        this.attractiveness_from1to10 = attractiveness_from1to10;
-        this.quality_from1to10 = quality_from1to10;
-        this.brightness_from1to10 = brightness_from1to10;
-    }
-}

laba4/Main.java

@@ -1,137 +0,0 @@
-import java.util.InputMismatchException;
-import java.util.Scanner;
-
-public class Main {
-    public static void main(String[] args) {
-
-
-        Scanner scanner = new Scanner(System.in);
-        int quantity = 0;
-        while (true) {
-            System.out.println("Скільки елементів в масиві ви хочете мати?");
-            try {
-                quantity = scanner.nextInt();
-                break;
-            } catch (InputMismatchException e) {
-                System.out.println("Введені символи не є цілим числом, спробуйте ще раз.");
-                scanner.nextLine();
-            }
-        }
-        Cosmetic[] arr = new Cosmetic[quantity];
-
-        for (int i = 0; i < quantity; i++) {
-            while (true) {
-                System.out.println("Бажаєте заповнить об'єкт №" + (i + 1) + " випадковими значеннями?(Введіть так або ні)");
-                String anwser = scanner.next();
-                if (anwser.equalsIgnoreCase("так")) {
-                    arr[i] = new Cosmetic();
-                    break;
-                } else {
-                    if (anwser.equalsIgnoreCase("ні")) {
-                        System.out.println("Добре, задайте дані об'єкта номер" + (i + 1) + ":");
-                        int price = 0;
-
-                            while (true) {
-                                System.out.print("Введіть ціну в долларах: ");
-                                try {
-                                    price = scanner.nextInt();
-                                    break;
-                                } catch (InputMismatchException e) {
-                                    System.out.println("Введені символи не є цілим числом, спробуйте ще раз.");
-                                    scanner.nextLine();
-                                }
-                            }
-
-
-                        int healthDamage = 0;
-                        while (true){
-                            System.out.print("Введіть шкоду здоров'ю по шкалі від 0 до 10: ");
-                            while (true) {
-                                try {
-                                    healthDamage = scanner.nextInt();
-                                    break;
-                                } catch (InputMismatchException e) {
-                                    System.out.println("Введені символи не є цілим числом, спробуйте ще раз:");
-                                    scanner.nextLine();
-                                }
-                            }
-                            if (healthDamage<=10&&healthDamage>=0){
-                                break;
-                            }
-                            else {
-                                System.out.println("Помилка! Число знаходиться не в межах від 1 до 10.");
-                            }
-                        }
-                        int attractiveness = 0;
-                        while (true){
-                            System.out.print("Введіть привабливість по шкалі від 0 до 10: ");
-                            while (true) {
-                                try {
-                                    attractiveness = scanner.nextInt();
-                                    break;
-                                } catch (InputMismatchException e) {
-                                    System.out.println("Введені символи не є цілим числом, спробуйте ще раз:");
-                                    scanner.nextLine();
-                                }
-                            }
-                            if (attractiveness<=10&&attractiveness>=0){
-                                break;
-                            }
-                            else {
-                                System.out.println("Помилка! Число знаходиться не в межах від 1 до 10.");
-                            }
-                        }
-                        int quality = 0;
-                        while (true){
-                            System.out.print("Введіть якість по шкалі від 0 до 10: ");
-                            while (true) {
-                                try {
-                                    quality = scanner.nextInt();
-                                    break;
-                                } catch (InputMismatchException e) {
-                                    System.out.println("Введені символи не є цілим числом, спробуйте ще раз:");
-                                    scanner.nextLine();
-                                }
-                            }
-                            if (quality<=10&&quality>=0){
-                                break;
-                            }
-                            else {
-                                System.out.println("Помилка! Число знаходиться не в межах від 1 до 10.");
-                            }
-                        }
-                        int brightness = 0;
-                        while (true){
-                            System.out.print("Введіть яркість по шкалі від 0 до 10: ");
-                            while (true) {
-                                try {
-                                    quality = scanner.nextInt();
-                                    break;
-                                } catch (InputMismatchException e) {
-                                    System.out.println("Введені символи не є цілим числом, спробуйте ще раз:");
-                                    scanner.nextLine();
-                                }
-                            }
-                            if (brightness<=10&&brightness>=0){
-                                break;
-                            }
-                            else {
-                                System.out.println("Помилка! Число знаходиться не в межах від 1 до 10.");
-                            }
-                        }
-
-                        arr[i] = new Cosmetic(price, healthDamage, attractiveness, quality, brightness);
-                        arr[i] = new Cosmetic();
-                    } else {
-                        System.out.println("Ви ввели не правильне значення");
-                    }
-                }
-            }
-        }
-
-        Cosmetic pomada = new Cosmetic();
-        Cosmetic c2 = new Cosmetic(10, 3, 7, 5, 9);
-        System.out.println(pomada.price_in_$);
-
-    }
-}

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

src/Lab2.java

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

src/Main.java

@@ -1,60 +1,42 @@
-import java.util.Scanner;
-import java.util.InputMismatchException;
-
 public class Main {
     public static void main(String[] args) {
-        Scanner scan = new Scanner(System.in);
+        System.out.println(args[2]);
-        System.out.println("Введіть значення n:");
+        System.out.println("Hello world!");
-        double n = 0;
+//        System.out.println(1);
-        try {
+
-            n = scan.nextDouble();
+        int a = 1;
-        } catch (InputMismatchException e) {
+        int b = 2;
-            System.out.println("Число введене не вірно");
+        int c = 1;
-            System.exit(0);
+        int d = 1;
-        }
+
-        System.out.println("Введіть значення m:");
+        System.out.println(2&1);
-        double m = 0;
+        System.out.println(2|1);
-        try {
+        int aa = 2;
-            m = scan.nextDouble();
+
-        } catch (InputMismatchException e) {
+        /*if (aa) {
-            System.out.println("Число введене не вірно");
+
-            System.exit(0);
+        }*/
+
+//        System.out.println("a"&"b");
+        System.out.println('a'&'b');
+
+        if ((a > b) & MyBooleanMethod()) {
+            System.out.println("?????????????????????????");
         }
 
-        System.out.println("Введіть значення a:");
-        double a = 0;
-        try {
-            a = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-        System.out.println("Введіть значення b:");
-        double b = 0;
-        try {
-            b = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-        if (a > n) {
-            System.out.println("Значення n має бути більшим або рівним  a");
-            System.exit(0);
-        }
-        if (b > m) {
-            System.out.println("Значення m має бути більшим або рівним  b");
-            System.exit(0);
-        }
-        double s1 = 0;
-        double s2 = 0;
 
-        for (double i = a; i <= n; i++) {
+    }
-            for (double j = b; j <= m; j++){
+
-                // оскільки C дорівнює 0, то можна скоротити i
+    static boolean MyBooleanMethod() {
-                s1=s1+(1/j);
+        System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
-            }
+        return true;
-            s2=s2+s1;
+    }
-        }
+
-        System.out.println("Результат:" + s2);
+    void myFunction() {
+
+    }
+
+    int myFunction2() {
+        return 1;
     }
 }

src/encapsulationInheritancePolymorphism/Encapsulation.java

@@ -0,0 +1,20 @@
+package encapsulationInheritancePolymorphism;
+
+public class Encapsulation {
+    /*private*/ int field;
+    private int field2;
+//    int a = 1;
+
+    public void myMethodForTheField () {
+        System.out.println(field);
+    }
+
+    public void myMethodForTheField2 () {
+        System.out.println(field);
+    }
+
+    public void myMethodForTheFieldAndTheField2 () {
+        System.out.println(field);
+    }
+}
+

src/encapsulationInheritancePolymorphism/EncapsulationInheritancePolymorphism.java

@@ -0,0 +1,10 @@
+package encapsulationInheritancePolymorphism;
+
+public class EncapsulationInheritancePolymorphism {
+
+    public static void main(String[] args) {
+        int a = 1;
+//        var b = 2;
+//        System.out.println(b);
+    }
+}

src/encapsulationInheritancePolymorphism/Main.java

@@ -0,0 +1,14 @@
+package encapsulationInheritancePolymorphism;
+
+public class Main {
+    public static void main(String[] args) {
+        Student student = new Student();
+
+
+
+
+        //...
+
+        student.setFaculty("FPM", "MO-22");
+    }
+}

src/encapsulationInheritancePolymorphism/Student.java

@@ -0,0 +1,18 @@
+package encapsulationInheritancePolymorphism;
+
+public class Student {
+    private String name;
+    private String surname;
+    private String group;
+    private String faculty;
+
+
+    public String getName() {
+        return name;
+    }
+
+    public void setFaculty(String faculty, String group) {
+        this.faculty = faculty;
+        this.group = group;
+    }
+}

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/lab2/Main.java

@@ -1,62 +0,0 @@
-package lab2;
-
-import java.util.InputMismatchException;
-import java.util.Scanner;
-
-public class Main {
-    public static void main(String[] args) {
-        Scanner scan = new Scanner(System.in);
-        System.out.println("Введіть значення n:");
-        double n = 0;
-        try {
-            n = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-        System.out.println("Введіть значення m:");
-        double m = 0;
-        try {
-            m = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-
-        System.out.println("Введіть значення a:");
-        double a = 0;
-        try {
-            a = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-        System.out.println("Введіть значення b:");
-        double b = 0;
-        try {
-            b = scan.nextDouble();
-        } catch (InputMismatchException e) {
-            System.out.println("Число введене не вірно");
-            System.exit(0);
-        }
-        if (a > n) {
-            System.out.println("Значення n має бути більшим або рівним  a");
-            System.exit(0);
-        }
-        if (b > m) {
-            System.out.println("Значення m має бути більшим або рівним  b");
-            System.exit(0);
-        }
-        double s1 = 0;
-        double s2 = 0;
-
-        for (double i = a; i <= n; i++) {
-            for (double j = b; j <= m; j++){
-                // оскільки C дорівнює 0, то можна скоротити i
-                s1=s1+(1/j);
-            }
-            s2=s2+s1;
-        }
-        System.out.println("Результат:" + s2);
-    }
-}

src/test/A.java

@@ -0,0 +1,13 @@
+package test;
+
+public class A {
+    /*private*/ int f/* = 3*/;
+
+    public int getF() {
+        return f;
+    }
+
+    public void setF(int f) {
+        this.f = f;
+    }
+}

src/test/Main.java

@@ -0,0 +1,15 @@
+package test;
+
+public class Main {
+    public static void main(String[] args) {
+        A a = new A();
+        System.out.println(a.getF());
+        a.setF(1);
+        System.out.println(a.getF());
+
+        System.out.println(a.f);
+
+        int[] array = {1, 2, 1};
+        System.out.println(array.length);
+    }
+}