118 lines
2.8 KiB
Kotlin
118 lines
2.8 KiB
Kotlin
package test1
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fun main() {
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println("Hello world!")
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}
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var x = 2
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var y: Int = 2
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val z: Int = 2
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fun main(array: Array<String>) {
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println(array.contentToString())
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print("Hello ")
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print("world!\n")
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main()
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println(42)
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val sum = sum(1, 2)
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println(sum)
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val sum2 = sum2(1, 6)
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println(sum2)
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println("总和为：$sum and $sum2 那么sum和sum2相加为：${sum + sum2}")
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val basicSyntax = BasicSyntax(2.0000, 6.0)
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println(basicSyntax.percent)
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// 模板字符串
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var a = 1
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val b = "a 是 $a"
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a = 2
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val c = "${b.replace("是", "就是")}，但是现在的a是 $a"
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println(c)
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// 返回最大值
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println(BasicSyntax(1.0, 2.0).maxOf(1, 2))
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println(BasicSyntax(1.0, 2.0).maxOf2(1, 2))
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println(maxOf3(1, 2))
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// 循环
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val items = listOf("11", "22", "23", "24", "25")
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for (item in items) {
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println(item)
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}
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for (index in items.indices) {
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println(index)
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}
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// 有多少元素
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val readOnlyShapes = mutableListOf("triangle", "square", "circle")
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println("readOnlyShapes有：${readOnlyShapes.count()}个元素")
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println("triangle" in readOnlyShapes)
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// 添加元素
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readOnlyShapes.add("YYY")
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println(readOnlyShapes)
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// 移出元素
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readOnlyShapes.remove("triangle")
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println(readOnlyShapes)
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// Set相关操作
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val readOnlyFruit = setOf("apple", "banana", "cherry", "cherry")
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val mutableSetOf = mutableSetOf(readOnlyFruit)
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println(readOnlyFruit)
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println(mutableSetOf)
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println("This set has ${readOnlyFruit.count()} items")
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// map 操作
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val readOnlyJuiceMenu = mapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
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println(readOnlyJuiceMenu)
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// {apple=100, kiwi=190, orange=100}
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// Mutable map with explicit type declaration
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val juiceMenu: MutableMap<String, Int> = mutableMapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
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println(juiceMenu)
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val SUPPORTED = setOf("HTTP", "HTTPS", "FTP")
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val requested = "smtp"
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val isSupported = requested.uppercase() in SUPPORTED // Write your code here
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println("Support for $requested: $isSupported")
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val number2word = mapOf(1 to "one", 2 to "tow") // Write your code here
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val n = 2
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println("$n is spelt as '${number2word[2]}'")
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}
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fun sum(a: Int, b: Int): Int {
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return a + b
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}
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fun sum2(a: Int, b: Int) = a + b
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class BasicSyntax(height: Double, length: Double) {
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val percent = (height + length) * 2
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fun maxOf(a: Int, b: Int): Int {
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if (a > b) {
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return a
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} else {
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return b
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}
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}
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fun maxOf2(a: Int, b: Int): Int {
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return if (a > b) {
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a
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} else {
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b
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}
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}
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}
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/* The comment starts here
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/* contains a nested comment */
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and ends here. */
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fun maxOf3(a: Int, b: Int) = if (a > b) a else b
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