kotlin guide

Kotlin class and object, and Kotlin Class Object InheritanceClass Use the class keyword to declare a class in Kotlin class Invoice { } The class Declaration consists of the class name, Class header (specifying its type parameter, main constructor, etc.), and the class body surrounded by curly brackets. Both the Class header and class body are optional.

Kotlin Series 5 --- data class, seal class, internal class details, kotlin --- Summary: kotlin has been learning for a while. It takes a little time to look at it every day. It will take a long time to forget it. It is only necessary to sort it out again, in this article, we will sort out the basic usage of several categories, which are roughly the same as thing

Talking about Kotlin (III): Class, talking about kotlin Kotlin (1): Introduction and configuration in Android Studio Kotlin (2): basic types, basic syntax, and code style Talking about Kotlin (3): Class Preface: I have learned the first two articles and have a basic underst

1 Creating a new projectAndroid Studio creates a new project with only one empty mainactivity2 Installing KotlinFile-seeting-plugins-install jetbrains Plugin input Kotlin installation,If the installation fails, open the C:\Users\ user \. Androidstudio2.3\system\log\idea.log "This file, find KotlinHttp://plugins.jetbrains.com/pluginManager/?action=downloadid=org.jetbrains.kotlinbuild= ai-162.2228.14uuid=6b417889-78a8-4cc8-ac6c-3e8d64c5a56cDownload to d

Kotlin series: function details, kotlin function details Summary: The Use and definition of functions in kotlin are more flexible and diverse. In addition, it supports different degrees of expansion to help developers create their own methods and improve development efficiency, here, we will briefly introduce the use of different functions. Extended functions wi

first, class definition The class is declared using the Generic keyword class in Kotlin, followed by the class name: Class Kotlinclass {// class name Kotlinclass //curly braces are the body composition } Interface Definition Interface Ikotlininterface Single Case Kotlin uses the object class to modify classes, you can implement a singleton mode,Java Singleton class: public class javainstanceclass{

Kotlin learning notes basic syntax, kotlin learning notesKotlin Study Notes (2)-basic syntax Kotlin learning notes Series Kotlin Study Notes (1)-Overview, learning curve, development tools, references 1. Basic syntax definition package The package declaration should be at the top of the source file: package hard.uistud

Kotlin and kotlinThe main function of the basic function variable can be independent of the class static function.Class static function, you need to put the function into the braces of the companion object. class Static { companion object { fun add( a: Int, b:Int):Int = ( a + b ) }}fun main(args: Array ) { Static.add(1,2);} String Template fun main(args: Array ) { println("Hello, ${if (args.size >

Just ended the Google IO Conference really dry, as programmers most let me just interested in or Google announced that Kotlin become the first development language AndroidThis is indeed a more shocking news, as the mobile development of me, is bound to grasp the development of the language in time.Personally read Kotlin's Chinese document, feel its grammar and swift very similar (in the end who copied who ~), so if you have the effect of swift develop

Issue 1: Create a new Android project that supports Kotlin, stuck in "Resolve Dependency:classpath"Solution Analysis:Generally encountered "Resolve Dependency:classpath" stuck motionless, and so on if still did not respond, should be never response. Restart Android Studio or Gradle sync again, and if not, look at the gradle version of "Gradle-wrapper.properties" in the project and go to the system. Gradle The directory below to see if the correspondin

Kotlin parameter confusions, kotlin ParameterThe literal function is enclosed in braces and the parameter is declared before (the parameter type can be omitted). The function body is after->. Parameter (T)-> R /*** Map function maps a value to another value * map accepts a function, which has a parameter T */inline fun Array . Map (transform :( T)-> R): List {Return mapTo (ArrayList (Si

Kotlin entry-coroutine internal mechanism, kotlin entry coroutineSuspension Function ?? A new type of function that appears after the coroutine is exposed. A function modified with a special modifier suspend is called a suspension function. A suspended function can only be called in the coroutine and other suspended functions. It cannot be used in other functions. To start a coroutine, it is necessary to su

Idea Chinese Input method's smart cue box does not follow the cursor problem I use the development tool is ideas this version of ideas has a problem; the Chinese input method of the smart box does not follow the cursor to solve the problem is very simple, only in the installation directory to change the JRE folder name, or just delete it. After doing so, idea will automatically use your system's JRE environment my system is jdk1.8.0_131; If you don't set your environment variable, you can now se

Interoperability is the interface that can invoke other programming languages in Kotlin, so long as they open the interface, Kotlin can invoke its member properties and member methods, which are unmatched by other programming languages. Also, the API interface in Kotlin can be invoked while Java programming is in progress. K