Lab 6, working, undocumented.

Java/lab_6/Album.kt

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+class Album(val albumName: String, val artist: String, val tracks: Array<Track>) {
+
+    fun tracksInDurationRange(durationRange: ClosedRange<Duration>): Array<Track> {
+        return this.tracks.filter { it.duration in durationRange }.toTypedArray()
+    }
+
+    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

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+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

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+class ElectroPop(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
+    override val style = "Electropop"
+}

Java/lab_6/Interlude.kt

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+class Interlude(numberInAlbum: Int, trackName: String, feature: String?, duration: Duration): Track(numberInAlbum, trackName, feature, duration) {
+    override val style = "Interlude"
+}

Java/lab_6/SynthPop.kt

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+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

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+package OOP.Java.lab_6
+
+import kotlin.time.Duration
+
+open class Track(val numberInAlbum: Int, val trackName: String, val feature: String?, val duration: Duration) {
+
+    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

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+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("$chromatica\n")
+
+    chromatica.tracks.sortBy { it.style }
+
+    println("Album sorted by musical style:\n$chromatica\n")
+
+    val durationRange = 1.minutes.. 3.minutes + 30.seconds
+
+    println(
+        "${chromatica.albumName} tracks in a duration range ($durationRange):\n${chromatica.tracksInDurationRange(durationRange).joinToString("\n")}"
+    )
+}
+
+