1,包级别的函数
All the functions and properties declared in a file example.kt inside a package org.foo.bar, including extension functions, are compiled into static methods of a Java class named org.foo.bar.ExampleKt
// example.kt
package demo
class Foo
fun bar() { ... }
对应的java操作
// Java new demo.Foo(); demo.ExampleKt.bar();
如果想给转换后的java类指定类名，可以用 @JvmName :
@file:JvmName("DemoUtils")
package demo
class Foo
fun bar() { ... }
java操作
// Java new demo.Foo(); demo.DemoUtils.bar();
参考文献 https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html
