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open class Person (open val name: String = "", open var age: Int) { init {} open fun greeting(pn: String) { println("$name says hello to $pn") } } cla 阅读全文
posted @ 2020-10-11 20:51
Zhentiw
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class Person (val name: String, var age: Int) { init {} fun greeting(pn: String) { println("$name says hello to $pn") } } fun main() { val p = Person( 阅读全文
posted @ 2020-10-11 20:34
Zhentiw
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fun reverse(numbers: List<Int>): List<Int> { var res = arrayListOf<Int>() for (i in 0..numbers.size-1) { res.add(numbers.get(numbers.size - 1 - i)) } 阅读全文
posted @ 2020-10-11 20:25
Zhentiw
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It is possible to give loop a name, it is useful when dealing with nested loop: fun main() { outer@ for (i in 1..10) { for (j in 1..10) { if (i - j == 阅读全文
posted @ 2020-10-11 20:07
Zhentiw
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fun main() { val list = listOf("Java", "Kotlin", "Python") for (element in list) { println(element) } for ((index, value) in list.withIndex()) { print 阅读全文
posted @ 2020-10-11 20:01
Zhentiw
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Array is mutable, but fixed length. Which means you can modify items in the Array, but you cannot add / remove item; // Array is fixed length, you can 阅读全文
posted @ 2020-10-11 19:55
Zhentiw
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Difference between "when" and Javascript "switch". In Switch, you have to call "break"; but "when", you don't need to. In Switch, the case expression 阅读全文
posted @ 2020-10-11 02:21
Zhentiw
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fun main() { val mode = 2 val result = when (mode) { 1 -> "1 is ok" 2 -> { println("2 is fine") val i: Int = 3 "return string 2 is fine" } else -> "la 阅读全文
posted @ 2020-10-11 02:14
Zhentiw
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fun main() { val mode = 3 when (mode) { 1 -> print("1 is ok") 2 -> { print("2 is fine") print("2 is fine") } else -> { print("large than 2 is not ok") 阅读全文
posted @ 2020-10-11 02:07
Zhentiw
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In Kotlin, it helps to avoid null reference, which means by default you cannot assign null value to any variable; But if you do want to assign null to 阅读全文
posted @ 2020-10-11 01:56
Zhentiw
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fun main() { val a = 4 val b: Byte = 127 val c: Short = 123 val d: Int = 7 val e: Long = 123456789 val f: Float = 3.73f val g: Double = 3.73 val h: Ch 阅读全文
posted @ 2020-10-11 01:48
Zhentiw
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using 'var', variable can be reassigned. using 'val', variable cannot be ressiagned. the same as Javascript 'const'. 阅读全文
posted @ 2020-10-11 01:32
Zhentiw
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