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Kotlin Packages and imports

Package

kotlin包定义不用像JAVA那样匹配文件目录.

package org.example

fun printMessage() { /*...*/ }
class Message { /*...*/ }

// ...

定义package, 那么源码中的实体名为org.example.printMessage和org.example.Message 不定义package, 那么没有package 名

Default imports

• kotlin.*
• kotlin.annotation.*
• kotlin.collections.*
• kotlin.comparisons.*
• kotlin.io.*
• kotlin.ranges.*
• kotlin.sequences.*
• kotlin.text.*
• JVM:
• java.lang.*
• kotlin.jvm.*
• JS:
• kotlin.js.*

Imports

import org.example.Message // Message is now accessible without qualification
import org.example.* // everything in 'org.example' becomes accessible

// 处理包名冲突
import org.example.Message // Message is accessible
import org.test.Message as testMessage // testMessage stands for 'org.test.Message'

import 可以不止导入类, 也可以导入:

• top-level functions and properties
• functions and properties declared in object declarations
• enum constants

If a top-level declaration is marked private, it is private to the file it’s declared in (see Visibility modifiers).

Reference

Packages and imports

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