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[Kotlin] added control flow, returns, jumps, classes and inheritance
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6 files changed

+519
-190
lines changed

6 files changed

+519
-190
lines changed

‎KotlinFromScratch/.idea/workspace.xml

+76-187
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‎KotlinFromScratch/src/ControlFlow.kt

+191
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class ControlFlow {
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fun test() {
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println("If Expression")
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val ten = 10
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val twenty = 20
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val max = getMax(ten, twenty)
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println("")
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println("When Expression")
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print("(when 1)fibonacci array = [")
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for (i in 1..10) {
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print(fibonacci1(i))
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if (i != 10)
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print(", ")
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}
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println("]")
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print("(when 2)fibonacci array = [")
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for (i in 1..10) {
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print(fibonacci2(i))
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if (i != 10)
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print(", ")
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}
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println("]")
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print("(when 3)")
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val taxi = Sedan()
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recogniseCar(taxi)
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println("")
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println("For Expression")
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val primes = intArrayOf(2, 3, 5, 7, 11, 13, 17, 23, 29, 31)
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print("(If 1)primes array = [")
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for (num in primes) {
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print("$num ,")
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}
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println("]")
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print("(If 2)primes array = [")
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for (index in 0 until primes.size) {
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print("${primes[index]} ,")
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}
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println("]")
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print("(If 3)primes array = [")
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for (index in primes.indices) {
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print("${primes[index]} ,")
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}
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println("]")
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print("(If 4)primes array = [")
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primes.forEach {
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print("$it ,")
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}
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println("]")
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print("(If 5)primes array = [")
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primes.forEachIndexed { index, i ->
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print(i)
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if (index != primes.lastIndex)
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print(", ")
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}
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println("]")
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print("Iterate over 2 numbers from the bottom. Primes array = [")
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for (index in primes.size - 1 downTo 0 step 2) {
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print("${primes[index]} ,")
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}
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println("]")
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println("")
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println("While Expression")
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print("Factors of 36 = [")
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var factors = findFactors1(36)
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factors.forEachIndexed { index, i ->
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print(i)
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if (index != factors.lastIndex)
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print(", ")
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}
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println("]")
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print("Factors of 42 = [")
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factors = findFactors2(42)
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factors.forEachIndexed { index, i ->
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print(i)
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if (index != factors.lastIndex)
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print(", ")
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}
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println("]")
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}
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private fun getMax(num1: Int, num2: Int): Int {
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return if (num1 > num2) {
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println("$num1 is larger")
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num1
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} else {
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println("$num2 is larger")
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num2
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}
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}
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private fun fibonacci1(size: Int): Int {
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if (size < 1) {
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throw ArrayIndexOutOfBoundsException("size must be positive")
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}
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return when (size) {
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1, 2 -> 1
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else -> {
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fibonacci1(size - 1) + fibonacci1(size - 2)
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}
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}
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}
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private fun fibonacci2(size: Int): Int {
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return when {
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size < 0 -> throw ArrayIndexOutOfBoundsException("size must be positive")
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size == 1 -> 1
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size == 2 -> 1
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else -> (fibonacci2(size - 1) + fibonacci2(size - 2))
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}
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}
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private fun recogniseCar(car: Car) {
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when (car) {
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is Sedan -> println("This is a ${car.getName()}")
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is Suv -> println("This is a ${car.getName()}")
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else -> println("No idea")
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}
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}
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private fun findFactors1(number: Int): IntArray {
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var factors = IntArray(0)
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var i = 1
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while (i <= (number / 2)) {
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if (number.rem(i) == 0) {
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factors += i
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}
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i++
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}
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factors += number
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return factors.sortedArray()
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}
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private fun findFactors2(number: Int): IntArray {
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var factors = IntArray(0)
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var i = 1
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do {
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if (number.rem(i) == 0) {
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factors += i
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}
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i++
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} while (i <= (number / 2))
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factors += number
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return factors.sortedArray()
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}
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}
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open class Car {
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open fun getName(): String {
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return "car"
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}
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}
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class Sedan : Car() {
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override fun getName(): String {
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return "sedan"
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}
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}
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class Suv : Car() {
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override fun getName(): String {
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return "suv"
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}
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}

‎KotlinFromScratch/src/Main.kt

+11-2
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,13 @@
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fun main(args: Array<String>) {
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val basicTypes = BasicTypes()
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basicTypes.test()
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// val basicTypes = BasicTypes()
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// basicTypes.test()
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// val controlFlow = ControlFlow()
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// controlFlow.test()
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// val returnsAndJumps = ReturnsAndJumps()
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// returnsAndJumps.test()
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val myClass = MyClass()
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myClass.test()
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}

‎KotlinFromScratch/src/MyClass.kt

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class MyClass {
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fun test() {
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println("Class with multiple constructors")
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val frank = Person("Frank", "S", "Watson")
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println(frank.fullName())
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println("")
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println("Inheritance")
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val wood = Student("Kent", "Wood")
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println(wood.fullName())
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var bar1 = Bar1(0)
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var bar2 = Bar2()
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println("")
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println("Inheritance (Child -> Parent -> Grandparent)")
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println("0. Initialise Child")
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val child = Child("memo1")
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println("1. Override function in Child")
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child.f()
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println("2. Inherited function from Parent")
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child.g()
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println("3. Call both super and override function in Child")
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child.h()
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println("4. Call both super and override function in inner Class of Parent")
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val parent = Parent("memo2")
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val colleague = parent.Colleague()
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colleague.g()
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}
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}
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open class Person {
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var firstName: String = ""
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var middleName: String = ""
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var lastName: String = ""
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constructor(firstName: String, lastName: String) {
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this.firstName = firstName
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this.lastName = lastName
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}
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constructor(firstName: String, middleName: String, lastName: String) : this(firstName, lastName) {
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this.middleName = middleName
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}
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var fullName: () -> String = {
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"$firstName $middleName $lastName"
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}
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}
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class Student : Person {
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constructor(firstName: String, lastName: String) : super(firstName, lastName) {
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this.firstName = firstName
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this.lastName = lastName
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}
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constructor(firstName: String, middleName: String, lastName: String) : this(firstName, lastName) {
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this.middleName = middleName
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}
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}
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interface Foo {
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val count: Int
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}
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class Bar1(override val count: Int) : Foo
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class Bar2 : Foo {
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override val count = 0
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}
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open class Grandparent(memo: String) {
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init {
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println("Initialising Grandparent")
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}
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open val id: Int = (0..10000).random().also { println("Initialising id in Grandparent: $it") }
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open fun f() {
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println("Grandparent.f()")
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}
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}
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open class Parent(memo: String) : Grandparent(memo) {
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init {
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println("Initialising Parent")
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}
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override val id: Int = (0..10000).random().also { println("Initialising id in Parent: $it") }
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override fun f() {
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println("Parent.f()")
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}
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fun g() {
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print("From Grandparent: ")
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super.f()
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print("From Child: ")
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f()
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}
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inner class Colleague {
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fun g() {
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print("From Grandparent: ")
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super@Parent.f()
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print("From Parent: ")
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f()
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}
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}
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}
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class Child(memo: String) : Parent(memo) {
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init {
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println("Initialising Child")
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}
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override val id: Int = (0..10000).random().also { println("Initialising id in Child: $it") }
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override fun f() {
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println("Child.f()")
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}
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fun h() {
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print("From Parent: ")
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super.f()
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print("From Child: ")
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f()
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}
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}
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abstract class Base {
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abstract fun f()
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}
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class Derived : Base() {
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override fun f() {
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}
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}

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