Zhentiw - 博客园

2020年10月12日

摘要： Singleton Object need to be defined as global variable: object Cache { val name= "Cache" fun retrieveDate(): Int { return 0 } } fun main() { println(C 阅读全文

posted @ 2020-10-12 14:58 Zhentiw 阅读(96) 评论(0) 推荐(0)

[Kotlin] Data class

摘要： If we want to use Class to represent a piece of data such as Object, we can use Data class instead of normal class. Difference: Data class has better 阅读全文

posted @ 2020-10-12 14:56 Zhentiw 阅读(176) 评论(0) 推荐(0)

[Kotlin] Class / Abstract class / Example

摘要： interface Lendable { fun borrow() } // The properties title, genre, and publicationYear can be included in the parent class because both books and DVD 阅读全文

posted @ 2020-10-12 14:53 Zhentiw 阅读(104) 评论(0) 推荐(0)

[Kotlin] Overriding Rules (super, final)

摘要： import java.util.* /** * You can edit, run, and share this code. * play.kotlinlang.org */ abstract class Course(val topic: String, val price: Double) 阅读全文

posted @ 2020-10-12 03:39 Zhentiw 阅读(75) 评论(0) 推荐(0)

[Kotlin] interface

摘要： import java.util.* /** * You can edit, run, and share this code. * play.kotlinlang.org */ interface Driveable { fun drive() } interface Buildable { va 阅读全文

posted @ 2020-10-12 03:24 Zhentiw 阅读(155) 评论(0) 推荐(0)

2020年10月11日

[Kotlin] Open Classes and Inheritance

摘要： 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 阅读(129) 评论(0) 推荐(0)

[Kotlin] Class

摘要： 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 阅读(106) 评论(0) 推荐(0)

[Kotlin] Reverse a List with downTo

摘要： 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 阅读(180) 评论(0) 推荐(0)

[Kotlin] Named loop

摘要： 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 阅读(89) 评论(0) 推荐(0)

[Kotlin] for loop

摘要： 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 阅读(126) 评论(0) 推荐(0)

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