Java (for Kotlin consumption) No hard keywords. People, who’ve already tried Kotlin, understand that this language is much more pleasant to write code in than Java. Last update: 2018-05-18. The Kotlin Programming Language. val MY_CONSTANT = "Constants" And if you want to create a public constant in kotlin like public static final in java, you can create it as follow. In Kotlin, all the compile-time constants are marked explicitly. Properties in Kotlin that are declared within a named object or a companion object, are used as static fields in Java. I know I can use const or @ JvmField for get rid of getter and setter but Object creation still is there. Note that it works only for primitive types and strings. While Kotlin becomes more and more popular, a lot of Java libraries are getting Kotlin helpers to make their usage from Kotlin code more idiomatic and clean. It replaces its name with its value everywhere in the code. To access these fields in Java, these must be annotated with @JvmField annotation , lateinit modifier or must be declared with a const modifier. When you add const to a property, that makes it a compile-time constant. 两个注解都是与java互操作相关。 原代码： class AnnotationTest{ companion object { var name:String = "" } } You can annotate a property with @JvmField if it has a backing field, is not private, does not have open, override or const modifiers, and is not a delegated property. JvmOverload, JvmStatic, JvmField: We will learn when to use these annotations in the Kotlin Tutorial. companion object{ const val MY_CONSTANT = "Constants" } Is there any way define protected constant without using object in kotlin? If you need to expose a Kotlin property as a field in Java, you need to annotate it with the @JvmField annotation. kotlin @JvmStatic 和 @JvmField. This document is a set of rules for authoring public APIs in Java and Kotlin with the intent that the code will feel idiomatic when consumed from the other language. Lateinit and lazy: These two are very important. Using of companion object and object seems like over kill to me. Contribute to JetBrains/kotlin development by creating an account on GitHub. The Kotlin compiler also inlines the value of such constant. Hi, i want to define protected constant with Kotlin but i am stuck. These require the use of backticks to escape when calling from Kotlin. Unnecessary object creation , getter and setter. Do not use any of Kotlin’s hard keywords as the name of methods or fields.

The field will have the same visibility as the underlying property. 10 min read. Google annonce pendant la conférence Google I/O 2017 que Kotlin devient le second langage de programmation officiellement pris en charge par Android [3] après Java. We use these in our app very frequently. In Kotlin, if you want to create the local constants which are supposed to be used with in the class then you can create it like below.

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