Initial commit

JavaOOP.iml

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+<?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://$MODULE_DIR$" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

lab_1/main.java

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+ package lab_1;
+
+import java.util.Scanner;
+
+public class main {
+    
+    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);
+    }
+}

lab_1/main.kt

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+package 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")
+}

lab_2/main.java

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+package lab_2;
+
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Scanner;
+
+public class main {
+
+    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));
+        }
+    }
+}

lab_3/main.java

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+package lab_3;
+
+public class main {
+    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));
+    }
+}

lab_4/Furniture.kt

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+package lab_4
+
+class Furniture(val name: String, val material: String, val price: Int, private val length: Int, private val width: Int, private val height: Int) {
+    fun print(nameWidth: Int, materialWidth: Int, priceWidth: Int){
+        val printString = StringBuilder()
+        printString
+//            .append("Furniture stats: {")
+            .append("Name: ${this.name.padEnd(nameWidth)}  ")
+            .append("Material: ${this.material.padEnd(materialWidth)}  ")
+            .append("Price: ${(this.price.toString() + " cu").padEnd(priceWidth + 3)}  ")
+            .append("Size: ${this.length}×${this.width}×${this.height}")
+
+        println(printString)
+    }
+}

lab_4/main.kt

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+package lab_4
+
+fun main() {
+    val furnitureArray = listOf(
+        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.maxBy {it.name.length}.name.length
+    val maxMaterialWidth = furnitureArray.maxBy { it.material.length }.material.length
+    val maxPriceWidth = furnitureArray.maxBy { it.price }.price.toString().length
+
+    println("\nUnsorted array:")
+    furnitureArray.forEach { it.print(maxNameWidth, maxMaterialWidth, maxPriceWidth) }
+
+    println("\nSorted alphabetically by name:")
+    furnitureArray.sortedBy { it.name }.forEach { it.print(maxNameWidth, maxMaterialWidth, maxPriceWidth) }
+
+    println("\nSorted alphabetically by material:")
+    furnitureArray.sortedBy { it.material }.forEach { it.print(maxNameWidth, maxMaterialWidth, maxPriceWidth) }
+}

lab_5/Letter.kt

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+package 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)
+    }
+}

lab_5/Punctuation.kt

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+package 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
+    }
+}

lab_5/Sentence.kt

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+package lab_5
+
+import lab_5.Letter
+
+/**
+ * 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 {
+        val sentence = mutableListOf<String>()
+        this.sentenceArray.first.indices.forEach {
+            sentence += this.sentenceArray.first[it].toString() + this.sentenceArray.second[it].toString()
+        }
+
+        return sentence.joinToString(" ")
+    }
+}

lab_5/Text.kt

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+package 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(private 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 substringToC = letters.sliceArray(leftBoundary..rightBoundary)
+
+                val letterEquals = substringToC.first().letterEquals(substringToC.last(), true)
+                val isAPalindrome = this.checkReverse(substringToC)
+                val isLargerThanPrevious = substringToC.size > result.length
+
+                if (letterEquals && isAPalindrome && isLargerThanPrevious) {
+                    result = substringToC.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(" ")
+    }
+}

lab_5/Word.kt

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+package lab_5
+
+import lab_5.Letter
+
+/**
+ * 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())
+}

lab_5/main.kt

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+package lab_5
+
+fun main() {
+    val textString = "Я Анна марія! kayak taco cat"
+    val text = Text(textString)
+    println(text)
+    println(text.palindromeSearch())
+}

lab_6/Album.kt

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+package 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: List<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.
+     */
+    private 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")}"
+    }
+}

lab_6/Dancepop.kt

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+package 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"
+}

lab_6/Electropop.kt

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+package 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"
+}

lab_6/Interlude.kt

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+package 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"
+}

lab_6/Synthpop.kt

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+package 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"
+}

lab_6/Track.kt

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+package 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})"
+        }
+    }
+}

lab_6/main.kt

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+package lab_6
+
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
+
+fun main() {
+
+    val chromatica = Album(
+        "Chromatica",
+        "Lady Gaga",
+        listOf(
+            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")
+        }"
+    )
+}
+
+