55 lines
1.0 KiB
Kotlin
55 lines
1.0 KiB
Kotlin
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val items = listOf("apple", "banana", "kiwifruit")
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fun main() {
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for (item in items) {
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println(item)
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}
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println("----------------")
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for (index in items.indices) {
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println("item 在 $index 是 ${items[index]}")
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}
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println("----------------像是Switch--------------")
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println(describe(1))
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println(describe("Hello"))
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println(describe(1000L))
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println(describe(2))
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println(describe("other"))
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println("----------------Ranges------------")
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rangeTest()
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println("----------------for..in..------------")
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forTest()
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}
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// 使用when
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fun describe(obj: Any): Any = when (obj) {
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1 -> "是一"
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"Hello" -> "Greeting"
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is Long -> "Long"
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!is String -> "Not a string"
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else -> "Unknown"
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}
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// 范围测试
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fun rangeTest() {
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val x = 10
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val y = 100
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if (x in 1..y + 1) {
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println("1 在这个范围里")
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}
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if (-1 !in 1..y + 1) {
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println("-1 不在这个范围里")
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}
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}
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fun forTest() {
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for (x in 1..5) {
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println(x)
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}
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}
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