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# 2013
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# 1/02
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# 2013 / /
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!
# 1/02
fun main(args: Array) {
println("Hello world!")
}
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kotlin.io.readLine000 JVM 58
# 3126 / /
fun main(args: Array) {
val name = readLine()
println("Hello $name!")
}
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# 2013 / /
import java.io.BufferedReader
import java.io.File
fun main(args: Array) {
val name = File("name.txt")
.bufferedReader()
.use { it.readLine() }
println("Hello $name!")
}
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# 1/02
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# 2013 / /
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• 2 /-1 3 /- 20021 C 8
# # # 2 /-1 0 #
fun main(args: Array) {
println("Hello world!")
}
20021 2 /-1 5
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• 15 2/ 2/- 0 1
# *5 2/ 3 1
fun main(args: Array) {
val name = readLine()
println("Hello $name!")
}
*5 2/ 8
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# 53 01 / 1 #
import java.io.BufferedReader
import java.io.File
fun main(args: Array) {
val name = File("name.txt")
.bufferedReader()
.use { it.readLine() }
println("Hello $name!")
}
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• /350-2 5 0-
# # # 8 350-2 1 /5 #
fun main(args: Array) {
window.alert("Hello World!")
}
350-2
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# 2013 / /
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# 1/02
expect object Hello {
fun say()
}
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# 2013 / /
actual object Hello {
actual fun say() =
showDialog("Hello!")
}
actual object Hello {
actual fun say() =
window.alert("Hello!")
}
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• 72 3 8
• 2 5
# 1 0 /
expect open class BigInteger(`val`: String) {
open fun add(`val`: BigInteger): BigInteger
}
actual typealias BigInteger = java.math.BigInteger
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• ,8 , 31132 13 0,
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# # # 3 0 2 1 / #
fun main(args: Array) {
val bi = BigInteger(”10”)
val sum =
bi.add(BigInteger(”20”))
...
}
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• 8 9 0
0 351 13 0
# 3 0 2 1 /
fun main(args: Array) {
val bi = BigInteger(”10”)
val div =
bi.divide(BigInteger(”5”))
...
}
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# 1/02 #
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# 1/02 ##
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# 1/02 #
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$
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# 2013 / / #
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# 1/02
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• 4 30 / 0 8 4
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# 58204 3 18
val hoge: dynamic = object {}
hoge.fuga = {} // OK
hoge.piyo().xxx.yyy() // OK
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• 351 2 3
23 3 8 K
# 8 03 / 3
expect class System {
companion object {
fun currentTimeMillis(): Long
}
}
// NG
actual typealias System = java.lang.System
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• 6 0 5 8 K 8
31 2 32 3 6 K
# 360 2 1 /6
// OK
actual class System {
actual companion object {
actual fun currentTimeMillis()
= java.lang.System.currentTimeMillis()
}
}
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• 7 0 5 8 K 8
31 2 32 3 K
# 3 0 2 1 /
// OK
actual fun System.Companion.currentTimeMillis()
= java.lang.System.currentTimeMillis()
class System {
companion object
}
expect fun System.Companion.currentTimeMillis(): Long
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