added comments

This reverts commit c95a243c84.

Java/lab_1/lab_1.java

@@ -1,33 +0,0 @@
- package OOP.Java.lab_1;
-
-import java.util.Scanner;
-
-public class lab_1 {
-    
-    public static int protectedInput(String variableToRead, Scanner input) {
-        do {
-            try {
-                System.out.printf("Enter %s: ", variableToRead);
-                return input.nextInt();
-            } catch (Exception e) {
-                System.out.printf("%s must be an integer.\n", variableToRead.toUpperCase());
-                input.nextLine();
-            }
-        } while (true);
-    }
-
-    public static void main(String[] args) {
-        Scanner input = new Scanner(System.in);
-
-        final int n = protectedInput("n", input);
-        final int m = protectedInput("m", input);
-        final int a = protectedInput("a", input);
-        final int b = protectedInput("b", input);
-
-        input.close();
-
-        final float s = ((float) (b + m) / 2) * (m - b + 1) * (n - a + 1);
-
-        System.out.println("S = " + s);
-    }
-}

Java/lab_1/lab_1.kt

@@ -1,23 +0,0 @@
-package OOP.Java.lab_1
-
-fun protectedInput(variableName: String): Int {
-    do {
-        try {
-            print("Enter $variableName: ")
-            return readln().toInt()
-        } catch (e: Exception) {
-            println("${variableName.uppercase()} must be an integer!")
-        }
-    } while (true)
-}
-
-fun main() {
-    val n: Int = protectedInput("n")
-    val m: Int = protectedInput("m")
-    val a: Int = protectedInput("a")
-    val b: Int = protectedInput("b")
-
-    val s: Float = (b + m).toFloat() / 2 * (m - b + 1) * (n - a + 1)
-
-    println("S = $s")
-}

Java/lab_2/lab_2.java

@@ -1,109 +0,0 @@
-package OOP.Java.lab_2;
-
-import org.jetbrains.annotations.Contract;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Scanner;
-
-public class lab_2 {
-
-    public static short protectedInput(String inputPrompt, String errorMessage, Scanner input) {
-        short read_variable;
-
-        do {
-            try {
-                System.out.println();
-                System.out.print(inputPrompt);
-
-                read_variable = input.nextShort();
-                break;
-            } catch (Exception e) {
-                System.out.println(errorMessage);
-                input.nextLine();
-            }
-        } while (true);
-
-        return read_variable;
-    }
-
-    @NotNull
-    public static String format(int number) {
-        int width = String.valueOf(number).length() + 1;
-
-        return "|%" + width + "d ";
-    }
-
-    @Contract(pure = true)
-    public static double average(@NotNull short[] row) {
-        short sum = 0;
-
-        for (short element : row) {
-            sum += element;
-        }
-
-        return (double) sum / row.length;
-    }
-
-    public static void main(String[] args) {
-        short rows, columns;
-
-        Scanner input = new Scanner(System.in);
-
-        final short a = protectedInput("Input a constant to multiply a matrix by: ",
-                "A constant must be a short-data type integer, try again.", input);
-
-        System.out.println();
-        System.out.println("Input size of the matrix.");
-
-        do {
-            rows = protectedInput("Rows: ",
-                    "A number of rows must be a short-data type integer, try again.", input);
-        } while (rows <= 0);
-
-        do {
-            columns = protectedInput("Columns: ",
-                    "A number of columns must be a short-data type integer, try again.", input);
-        } while (columns <= 0);
-
-        input.close();
-
-        short[][] matrix_B = new short[rows][columns];
-
-        System.out.println();
-        System.out.println("Matrix B:");
-
-        String format = format(rows * columns);
-
-        for (short i = 0; i < rows; i++) {
-            for (short j = 0; j < columns; j++) {
-                matrix_B[i][j] = (short) ((i + 1) * (j + 1));
-
-                System.out.printf(format, matrix_B[i][j]);
-            }
-
-            System.out.println("|");
-        }
-
-        System.out.println();
-        System.out.println("Matrix a×B:");
-
-        format = format(rows * columns * a);
-
-        for (short i = 0; i < matrix_B.length; i++) {
-            for (short j = 0; j < matrix_B[i].length; j++) {
-                matrix_B[i][j] *= (a);
-
-                System.out.printf(format, matrix_B[i][j]);
-            }
-
-            System.out.println("|");
-        }
-
-        System.out.println();
-        System.out.println("Averages of each row:");
-
-        for (short[] row : matrix_B) {
-            System.out.println(average(row));
-        }
-    }
-}

Java/lab_3/lab_3.java

@@ -1,57 +0,0 @@
-package OOP.Java.lab_3;
-
-public class lab_3 {
-    static int maxStrLength;
-    static String result;
-    
-    public static void cSubUtil(StringBuilder stringbuilder, int leftBoundary, int rightBoundary) {
-        String string = stringbuilder.toString().toLowerCase().replaceAll("[^a-z]","");
-        // check if the indices lie in the range of string
-        // and also if it is palindrome
-        while (leftBoundary >= 0 && rightBoundary < string.length() && string.toLowerCase().charAt(leftBoundary) == string.toLowerCase().charAt(rightBoundary)) {
-            // expand the boundary
-            leftBoundary--;
-            rightBoundary++;
-        }
-        // if it's length is greater than maxStrLength update
-        // maxLength and result
-        if (rightBoundary - leftBoundary - 1 >= maxStrLength) {
-            result = string.substring(leftBoundary + 1, rightBoundary);
-            maxStrLength = rightBoundary - leftBoundary - 1;
-        }
-    }
-
-    public static int longestPalSubstr(StringBuilder string)
-    {
-        result = "";
-        maxStrLength = 1;
-        // for every index in the string check palindromes
-        // starting from that index
-        for (int i = 0; i < string.length(); i++) {
-            // check for odd length palindromes
-            cSubUtil(string, i, i);
-            // check for even length palindromes
-            cSubUtil(string, i, i + 1);
-        }
-        System.out.println("Longest palindrome substring is: " + compareStrings(string));
-        return compareStrings(string).length();
-    }
-
-    public static String compareStrings(StringBuilder builder) {
-        for (int leftBoundary = 0; leftBoundary <= builder.length(); leftBoundary++) {
-            for (int rightBoundary = builder.length(); rightBoundary >= leftBoundary; rightBoundary--) {
-                if (result.equals(builder.substring(leftBoundary, rightBoundary).toLowerCase().replaceAll("[^a-z]",""))) {
-                    return builder.substring(leftBoundary, rightBoundary);
-                }
-            }
-        }
-        return "";
-    }
-
-    public static void main(String[] args) {
-        StringBuilder stringToDetect = new StringBuilder("Eva, can I see bees in a cave?");
-
-        System.out.println("Initial string: " + stringToDetect);
-        System.out.println("Length is: " + longestPalSubstr(stringToDetect));
-    }
-}

Java/lab_4/Furniture.kt

@@ -1,11 +0,0 @@
-package OOP.Java.lab_4
-
-class Furniture(val name: String, val material: String, val price: Int, val length: Int, val width: Int, val height: Int) {
-    fun print(nameWidth: Int, materialWidth: Int, priceWidth: Int){
-        print("Furniture stats: {")
-        print("Name: ${this.name.padEnd(nameWidth)}   ")
-        print("Material: ${this.material.padEnd(materialWidth)}   ")
-        print("Price: ${(this.price.toString() + " cu").padEnd(priceWidth + 3)}   ")
-        print("Size: ${this.length}×${this.width}×${this.height}};\n")
-    }
-}

Java/lab_4/lab_4.kt

@@ -1,26 +0,0 @@
-package OOP.Java.lab_4
-
-fun main() {
-    val furnitureArray = arrayOf(
-        Furniture("Chair", "Wood", 10, 5, 5, 10),
-        Furniture("Counter-top", "Marble", 1_000, 10, 5, 1),
-        Furniture("Dinner table", "Glass", 500, 15, 10, 1),
-        Furniture("Office table", "Wood", 200, 10, 7, 1),
-        Furniture("Refrigerator", "Stainless steel", 20_000, 8, 4, 10)
-    )
-
-    val maxNameWidth = furnitureArray.maxWith(Comparator.comparingInt { it.name.length }).name.length
-    val maxMaterialWidth = furnitureArray.maxWith(Comparator.comparingInt { it.material.length }).material.length
-    val maxPriceWidth = furnitureArray.maxWith(Comparator.comparingInt { it.price }).price.toString().length
-
-    println("\nUnsorted array:")
-    for (item in furnitureArray) item.print(maxNameWidth, maxMaterialWidth, maxPriceWidth)
-
-    println("\nSorted alphabetically by name:")
-    furnitureArray.sortBy { it.name }
-    for (item in furnitureArray) item.print(maxNameWidth, maxMaterialWidth, maxPriceWidth)
-
-    println("\nSorted alphabetically by material:")
-    furnitureArray.sortBy { it.material }
-    for (item in furnitureArray) item.print(maxNameWidth, maxMaterialWidth, maxPriceWidth)
-}

Java/lab_5/Letter.kt

@@ -1,23 +0,0 @@
-package OOP.Java.lab_5
-
-/**
- * A class representing a single letter in a word.
- *
- * @property character a character value of a Letter.
- */
-class Letter(private val character: Char) {
-    override fun toString(): String {
-        return this.character.toString()
-    }
-
-    /**
-     * Indicates whether the two objects of class Letter are "equal".
-     *
-     * @param letter a letter to compare.
-     * @param ignoreCase if set to "true" will ignore the case of Letters compared.
-     * @return "true" if letters are equal and "false" if they aren't.
-     */
-    fun letterEquals(letter: Letter, ignoreCase: Boolean): Boolean {
-        return this.character.toString().equals(letter.toString(), ignoreCase)
-    }
-}

Java/lab_5/Punctuation.kt

@@ -1,19 +0,0 @@
-package OOP.Java.lab_5
-
-/**
- * A class representing a punctuation mark following a word or a sentence.
- *
- * @property punctuationMark a [String] value of a punctuation mark.
- */
-class Punctuation(var punctuationMark: String) {
-
-    init {
-        if (!"\\p{Punct}".toRegex().containsMatchIn(punctuationMark)) {
-            this.punctuationMark = ""
-        }
-    }
-
-    override fun toString(): String {
-        return punctuationMark
-    }
-}

Java/lab_5/Sentence.kt

@@ -1,35 +0,0 @@
-package OOP.Java.lab_5
-
-/**
- * A class representing a single sentence is a text.
- *
- * @property sentenceArray a [Pair] of [Array]s of [Word] and [Punctuation] objects that make up a sentence.
- *
- * @constructor a primary constructor accepts a [Pair] of [Array]s of [Word] and [Punctuation] objects, a secondary one accepts a string representing the entire sentence.
- */
-class Sentence(var sentenceArray: Pair<Array<Word>, Array<Punctuation>>) {
-
-    constructor(
-        sentenceString: String
-    ) : this(
-        Pair(
-            sentenceString.split("[\\p{Punct}\\s]+".toRegex()).filter { it.isNotEmpty() }.map { word -> Word(word) }.toTypedArray(),
-            sentenceString.split(" ").map { word -> Punctuation(word.last().toString()) }.toTypedArray()
-        )
-    )
-
-    /**
-     * Returns an array of all [Letter] objects in a sentence.
-     */
-    fun getAllLetters(): Array<Letter> {
-        var allLetters = arrayOf<Letter>()
-        this.sentenceArray.first.forEach { allLetters += it.letters }
-        return allLetters
-    }
-
-    override fun toString(): String {
-        var sentence = arrayOf<String>()
-        this.sentenceArray.first.indices.forEach {sentence += this.sentenceArray.first[it].toString() + this.sentenceArray.second[it].toString() }
-        return sentence.joinToString(" ")
-    }
-}

Java/lab_5/Text.kt

@@ -1,83 +0,0 @@
-package OOP.Java.lab_5
-
-/**
- * A class representing the entire text.
- *
- * @property textArray a [Pair] of [Array]s of [Sentence] and [Punctuation] objects that make up a text.
- *
- * @constructor a primary constructor accepts a [Pair] of [Array]s of [Sentence] and [Punctuation] objects, a secondary one accepts a string representing the entire text.
- */
-class Text(var textArray: Pair<Array<Sentence>, Array<Punctuation>>) {
-
-    constructor(
-        textString: String
-    ) : this(
-        Pair(
-            textString.split("[.!?] ?".toRegex()).filter { it.isNotEmpty() }.map { sentence -> Sentence(sentence) }.toTypedArray(),
-            textString.split("(?<=[.!?]) ?".toRegex()).filter { it.isNotEmpty() }.map { sentence -> Punctuation(sentence.last().toString()) }.toTypedArray()
-        )
-    )
-
-    /**
-     * Returns an array of all [Letter] objects in a sentence.
-     */
-    private fun getAllLetters(): Array<Letter> {
-        var allLetters = arrayOf<Letter>()
-        this.textArray.first.forEach { allLetters += it.getAllLetters() }
-        return allLetters
-    }
-
-    /**
-     * Searches for the longest palindromic substring in a given text.
-     *
-     * @return the longest palindromic substring found.
-     */
-    fun palindromeSearch(): String {
-        var result = "  "
-
-        val letters = this.getAllLetters()
-
-        for (leftBoundary in letters.indices) {
-            for (rightBoundary in letters.lastIndex downTo leftBoundary + 1) {
-                val subToC = letters.sliceArray(leftBoundary..rightBoundary)
-
-                if (subToC.first().letterEquals(subToC.last(), true) && this.checkReverse(subToC) && subToC.size > result.length) {
-                    result = subToC.joinToString("")
-                }
-            }
-        }
-
-        return result
-    }
-
-    /**
-     * Checks if a given substring is a palindrome.
-     *
-     * Is not case-sensitive.
-     *
-     * @param substring an [Array] of [Letter] objects representing a substring.
-     *
-     * @return "true" is a substring given is a palindrome, "false" if it isn't.
-     */
-    private fun checkReverse(substring: Array<Letter>): Boolean {
-        var leftBoundary = 0
-        var rightBoundary = substring.lastIndex
-        var result = false
-        val correction = substring.size % 2
-
-        while (leftBoundary < substring.size / 2 && rightBoundary >= substring.size / 2 + correction) {
-            leftBoundary++
-            rightBoundary--
-            result = substring[leftBoundary].letterEquals(substring[rightBoundary], true)
-        }
-
-        return result
-    }
-
-
-    override fun toString(): String {
-        var text = arrayOf<String>()
-        this.textArray.first.indices.forEach { text += this.textArray.first[it].toString() + this.textArray.second[it].toString() }
-        return text.joinToString(" ")
-    }
-}

Java/lab_5/Word.kt

@@ -1,22 +0,0 @@
-package OOP.Java.lab_5
-
-/**
- * A class representing a single word is a sentence.
- *
- * @property letters an array of [Letter] objects that make up a word.
- *
- * @constructor a primary constructor accepts an array of [Letter] objects, a secondary one accepts a string representing the entire word.
- */
-class Word(var letters: Array<Letter>) {
-
-    override fun toString(): String {
-        val wordString = StringBuilder()
-        this.letters.forEach { wordString.append(it) }
-
-        return wordString.toString()
-    }
-
-    constructor(
-        word: String
-    ) : this((word.toCharArray().map { letter -> Letter(letter) }).toTypedArray())
-}

Java/lab_6/Album.kt

@@ -1,33 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents an album by a specific artist, containing multiple tracks.
- *
- * @property albumName The name of the album.
- * @property artist The artist or band associated with the album.
- * @property tracks An [Array] of tracks included on the album.
- */
-class Album(val albumName: String, val artist: String, val tracks: Array<Track>) {
-
-    /**
-     * Returns an array of tracks within the specified duration range.
-     */
-    fun tracksInDurationRange(durationRange: ClosedRange<Duration>): Array<Track> {
-        return this.tracks.filter { it.duration in durationRange }.toTypedArray()
-    }
-
-    /**
-     * Returns the total duration of all tracks on the album.
-     */
-    fun totalDuration(): Duration {
-        var totalDuration: Duration = Duration.ZERO
-        this.tracks.forEach { totalDuration += it.duration }
-        return totalDuration
-    }
-
-    override fun toString(): String {
-        return "${this.albumName} by ${this.artist}\nTotal duration: ${this.totalDuration()}\nTracks:\n${this.tracks.joinToString("\n")}"
-    }
-}

Java/lab_6/Dancepop.kt

@@ -1,15 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents a track in the Dance-pop style.
- *
- * @param numberInAlbum The position of the track on the album.
- * @param trackName The name of the track.
- * @param feature The featured artist(s) in the track (nullable if no featured artist).
- * @param duration The [Duration] of the track.
- */
-class Dancepop(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
-    override val style = "Dance-pop"
-}

Java/lab_6/Electropop.kt

@@ -1,15 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents a track in the Electropop style.
- *
- * @param numberInAlbum The position of the track on the album.
- * @param trackName The name of the track.
- * @param feature The featured artist(s) in the track (nullable if no featured artist).
- * @param duration The [Duration] of the track.
- */
-class Electropop(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
-    override val style = "Electropop"
-}

Java/lab_6/Interlude.kt

@@ -1,15 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents an interlude track.
- *
- * @param numberInAlbum The position of the track on the album.
- * @param trackName The name of the track.
- * @param feature The featured artist(s) in the track (nullable if no featured artist).
- * @param duration The [Duration] of the track.
- */
-class Interlude(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
-    override val style = "Interlude"
-}

Java/lab_6/Synthpop.kt

@@ -1,15 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents a track in the Synth-pop style.
- *
- * @param numberInAlbum The position of the track on the album.
- * @param trackName The name of the track.
- * @param feature The featured artist(s) in the track (nullable if no featured artist).
- * @param duration The [Duration] of the track.
- */
-class Synthpop(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
-    override val style = "Synth-pop"
-}

Java/lab_6/Track.kt

@@ -1,27 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration
-
-/**
- * Represents a track on an album.
- *
- * @param numberInAlbum The position of the track on the album.
- * @param trackName The name of the track.
- * @param feature The featured artist(s) in the track (nullable if no featured artist).
- * @param duration The [Duration] of the track.
- */
-open class Track(val numberInAlbum: Int, val trackName: String, val feature: String?, val duration: Duration) {
-
-    /**
-     * The style or genre of the track.
-     */
-    open val style = ""
-
-    override fun toString(): String {
-        return if (this.feature == null) {
-            "#${this.numberInAlbum}: ${this.trackName} (${this.duration})"
-        } else {
-            "#${this.numberInAlbum}: ${this.trackName} ft. ${this.feature} (${this.duration})"
-        }
-    }
-}

Java/lab_6/main.kt

@@ -1,42 +0,0 @@
-package OOP.Java.lab_6
-
-import kotlin.time.Duration.Companion.minutes
-import kotlin.time.Duration.Companion.seconds
-
-fun main() {
-
-    val chromatica = Album(
-        "Chromatica",
-        "Lady Gaga",
-        arrayOf(
-            Interlude(1, "Chromatica I", null, 1.minutes),
-            Synthpop(2, "Alice", null, 2.minutes + 57.seconds),
-            Dancepop(3, "Stupid Love", null, 3.minutes + 13.seconds),
-            Dancepop(4, "Rain On Me", "Ariana Grande", 3.minutes + 2.seconds),
-            Synthpop(5, "Free Woman", null, 3.minutes + 11.seconds),
-            Electropop(6, "Fun Tonight", null, 2.minutes + 53.seconds),
-            Interlude(7, "Chromatica II", null, 41.seconds),
-            Synthpop(8, "911", null, 2.minutes + 52.seconds),
-            Electropop(9, "Plastic Doll", null, 3.minutes + 41.seconds),
-            Dancepop(10, "Sour Candy", "Blackpink", 2.minutes + 37.seconds),
-            Dancepop(11, "Enigma", null, 2.minutes + 59.seconds),
-            Synthpop(12, "Replay", null, 3.minutes + 6.seconds),
-            Interlude(13, "Chromatica III", null, 27.seconds),
-            Electropop(14, "Sine From Above", "Elton John", 4.minutes + 4.seconds),
-            Synthpop(15, "1000 Doves", null, 3.minutes + 35.seconds),
-            Dancepop(16, "Babylon", null, 2.minutes + 41.seconds)
-        )
-    )
-
-    println("$chromatica\n")
-
-    println("${chromatica.albumName} tracks sorted by musical style:\n${chromatica.tracks.sortedBy { it.style }.joinToString("\n")}\n")
-
-    val durationRange = 1.minutes.. 3.minutes + 30.seconds
-
-    println(
-        "${chromatica.albumName} tracks in a duration range ($durationRange):\n${chromatica.tracksInDurationRange(durationRange).joinToString("\n")}"
-    )
-}
-
-

Lab3/Lab2/Lab2/Program.cs

@@ -0,0 +1,40 @@
+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

@@ -0,0 +1,33 @@
+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

@@ -0,0 +1,86 @@
+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

@@ -0,0 +1,121 @@
+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)
+            {
+            }
+        }
+    }
+}

READ ME

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

Rust/lab_1/Cargo.lock

@@ -1,16 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "lab_1"
-version = "0.1.0"
-dependencies = [
- "text_io",
-]
-
-[[package]]
-name = "text_io"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d5f0c8eb2ad70c12a6a69508f499b3051c924f4b1cfeae85bfad96e6bc5bba46"

Rust/lab_1/Cargo.toml

@@ -1,9 +0,0 @@
-[package]
-name = "lab_1"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-text_io = "0.1.12"

Rust/lab_1/src/main.rs

@@ -1,22 +0,0 @@
-fn protected_read(variable_name: &str) -> i32 {
-    use text_io::try_read;
-    loop {
-        print!("Enter {}: ", variable_name);
-        let read_result: Result<i32, _> = try_read!();
-        match read_result {
-            Ok(read_integer) => return read_integer,
-            Err(_e) => println!("{} must be an integer!", variable_name.to_uppercase()),
-        }
-    }
-}
-
-fn main() {
-    let n: i32 = protected_read("n");
-    let m: i32 = protected_read("m");
-    let a: i32 = protected_read("a");
-    let b: i32 = protected_read("b");
-
-    let s: f32 = ((b + m) as f32 / 2f32) * ((m - b + 1) * (n - a + 1)) as f32;
-
-    println!("S = {}", s);
-}

Rust/lab_2/Cargo.lock

@@ -1,16 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "lab_2"
-version = "0.1.0"
-dependencies = [
- "text_io",
-]
-
-[[package]]
-name = "text_io"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d5f0c8eb2ad70c12a6a69508f499b3051c924f4b1cfeae85bfad96e6bc5bba46"

Rust/lab_2/Cargo.toml

@@ -1,9 +0,0 @@
-[package]
-name = "lab_2"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-text_io = "0.1.12"

Rust/lab_2/src/main.rs

@@ -1,140 +0,0 @@
-// #[allow(dead_code)]
-fn capitalise(s: &str) -> String {
-    let mut c = s.chars();
-    match c.next() {
-        None => String::new(),
-        Some(f) => f.to_uppercase().collect::<String>() + c.as_str(),
-    }
-}
-
-fn read_row() -> Vec<i16> {
-    loop {
-        print!("Row (separated by spaces): ");
-        let raw_row: String = text_io::read!("{}\n");
-        let trimmed_row: &str = raw_row.trim();
-        match trimmed_row.split(" ").all(|value| {
-            value.chars().all(|char| char.is_numeric() || char == '-')
-                && value.parse::<i32>().unwrap() <= i16::MAX as i32
-                && value.parse::<i32>().unwrap() >= i16::MIN as i32
-        }) {
-            true => {
-                return trimmed_row
-                    .split(" ")
-                    .map(|value| value.parse::<i16>().unwrap())
-                    .collect::<Vec<i16>>()
-            }
-            false => println!("[Error] The row must consist of short integers, try again."),
-        }
-    }
-}
-
-fn generate_row(row_index: u16, length: u16) -> Vec<i16> {
-    return (0..length)
-        .map(|element_index| (element_index as i16 + 1) * (row_index as i16 + 1))
-        .collect();
-}
-
-fn read_matrix() -> Vec<Vec<i16>> {
-    let rows: u16 = protected_u16_read("the number of rows");
-    loop {
-        print!("Generate [s]quare or [r]ectangle matrix or [i]nput manually [s/r/i]: ");
-        let option: String = text_io::read!();
-        match option.to_lowercase().as_str() {
-            "s" => return (0..rows).map(|i| generate_row(i, rows)).collect(),
-            "r" => {
-                let columns: u16 = protected_u16_read("the number of columns");
-                return (0..rows).map(|i| generate_row(i, columns)).collect();
-            }
-            "i" => return (0..rows).map(|_| read_row()).collect(),
-            _ => println!("[Error] Not an option, try again."),
-        }
-    }
-}
-
-fn protected_u16_read(variable_name: &str) -> u16 {
-    use text_io::try_read;
-    loop {
-        print!("Enter {}: ", variable_name);
-        let read_result: Result<u16, _> = try_read!();
-        match read_result {
-            Ok(read_integer) => return read_integer,
-            Err(_e) => println!(
-                "{} must be a short integer, try again.",
-                capitalise(variable_name)
-            ),
-        }
-    }
-}
-
-fn multiply_matrix_by_number(matrix: &Vec<Vec<i16>>, multiplier: u16) -> Vec<Vec<i16>> {
-    return matrix
-        .iter()
-        .map(|row| {
-            row.iter()
-                .map(|element| element * multiplier as i16)
-                .collect()
-        })
-        .collect();
-}
-
-fn average_of_row(row: &Vec<i16>) -> f32 {
-    return row.iter().sum::<i16>() as f32 / row.len() as f32;
-}
-
-fn format_matrix(matrix: &Vec<Vec<i16>>) -> String {
-    let max_width = matrix
-        .iter()
-        .map(|row| {
-            row.iter()
-                .map(|element| element.to_string().len())
-                .max()
-                .unwrap()
-        })
-        .max()
-        .unwrap();
-
-    let mut formatted_matrix: String = matrix
-        .iter()
-        .map(|row| {
-            row.iter()
-                .map(|element| format!("| {:max_width$} ", element))
-                .collect::<Vec<String>>()
-                .join("")
-        })
-        .collect::<Vec<String>>()
-        .join("|\n");
-    formatted_matrix.push('|');
-    return formatted_matrix;
-}
-
-fn format_column(column: &Vec<f32>) -> String {
-    let max_width = column
-        .iter()
-        .map(|element| element.to_string().len())
-        .max()
-        .unwrap();
-
-    return column
-        .iter()
-        .map(|element| format!("| {:max_width$} |", element))
-        .collect::<Vec<String>>()
-        .join("\n");
-}
-
-fn main() {
-    let full_vec_test: Vec<Vec<i16>> = read_matrix();
-    println!("\nMatrix B:\n{}\n", format_matrix(&full_vec_test));
-
-    let mult_full_vec_test: Vec<Vec<i16>> =
-        multiply_matrix_by_number(&full_vec_test, protected_u16_read("matrix multiplier"));
-    println!("Matrix a×B:\n{}\n", format_matrix(&mult_full_vec_test));
-
-    let row_averages: Vec<f32> = mult_full_vec_test
-        .iter()
-        .map(|row| average_of_row(row))
-        .collect();
-    println!(
-        "Averages for each row in a×B:\n{}",
-        format_column(&row_averages)
-    );
-}

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 +1,26 @@
+public class Lab2 {
+    public static void main(String[] args) {
+        int[] array = {1, 2, 3};
+        /*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}
+        };
+    }
+}

src/Main.java

@@ -0,0 +1,42 @@
+public class Main {
+    public static void main(String[] args) {
+        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() {
+
+    }
+
+    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/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);
+    }
+}