How to use Kotlin

This article introduces the knowledge of "how to use Kotlin". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Singleton class modified by inal

The object-modified class is equivalent to the Java final-modified singleton class, using val clazz = ObjTest

Object ObjTest {val I = 0 val str = "hello" fun go () {val str = "am go" println ("I am the go method")} 2, Object decorates anonymous inner class bject Test {@ JvmStatic fun main (args: Array) {val kClazz = KClazz () / / equivalent to Java's anonymous inner class kClazz.go (object: IObjListener {override fun o () {}})}}

3. Kotlin singletons are written in the following ways

Class DoubleCheckSin private constructor () {companion object {val doubleCheckSin: DoubleCheckSin by lazy {DoubleCheckSin ()} fun calculate () {}}

It is troublesome to use object to generate singletons, and it is troublesome to do reset. You need to clear each field manually, and you can leave the object empty directly through the above.

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