71. What is the difference between a and b?
var a: String? = "KotlinProgramming"
var b: String = 'KotlinProgramming"
var a: String? = "KotlinProgramming"
var b: String = 'KotlinProgramming"72. Which is true for the following simple class declaration?
class Person (val name: String)
class Person (val name: String)73. The code below compiled and executed without issue before the addition of the line declaring errorStatus. Why does this line break the code?
sealed class Status(){
object Error : Status()
class Success : Status()
}
fun main(){
var successStatus = Status.Success()
var errorStatus = Status.Error()
}
sealed class Status(){
object Error : Status()
class Success : Status()
}
fun main(){
var successStatus = Status.Success()
var errorStatus = Status.Error()
}74. The code below is expected to display the numbers from 1 to 10, but it does not. Why?
val seq = sequence { yieldAll(1..20) }
.filter { it < 11 }
println(seq)
val seq = sequence { yieldAll(1..20) }
.filter { it < 11 }
println(seq)75. You have an unordered list of high scores. Which is the simple method to sort the highScores in descending order?
fun main() { val highScores = listOf(4000, 2000, 10200, 12000, 9030)}
fun main() { val highScores = listOf(4000, 2000, 10200, 12000, 9030)}76. What three methods does this class have?
class Person
class Person77. In this code snippet, why does the compiler not allow the value of y to change?
for(y in 1..100) y+=2
for(y in 1..100) y+=278. Both const and @JvmField create constants. What can const do that @JvmField cannot?
class Detail {
companion object {
const val COLOR = "Blue"
@JvmField val SIZE = "Really Big"
}
}
class Detail {
companion object {
const val COLOR = "Blue"
@JvmField val SIZE = "Really Big"
}
}79. You have two arrays, a and b. Which line combines a and b as a list containing the contents of both?
val a = arrayOf(1, 2, 3) val b = arrayOf(100, 200, 3000)
val a = arrayOf(1, 2, 3) val b = arrayOf(100, 200, 3000)80. When the Airplane class is instantiated, it displays Aircraft = null, not Aircraft = C130 why?
abstract class Aircraft {
init { println("Aircraft = ${getName()}") }
abstract fun getName(): String
}
class Airplane(private val name: String) : Aircraft() {
override fun getName(): String = name
}
abstract class Aircraft {
init { println("Aircraft = ${getName()}") }
abstract fun getName(): String
}
class Airplane(private val name: String) : Aircraft() {
override fun getName(): String = name
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