January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Kotlin from Java
Just as Java can be used seamlessly in Kotlin, Kotlin can just as easily be used from your Java programs.
Top-level functions
The JVM does not support top-level functions. Therefore, to make them work with Java, the Kotlin compiler creates a Java class with the name of the package. The functions are then defined as Java methods on this class, which must be instantiated before use.
For example, consider the following top-level function:
package com.packt.chapter4
fun cube(n: Int): Int = n * n * n
If this is given, the Kotlin compiler will generate a class called com.packt.chapter4.Chapter4 with functions as static members. To use this from Java, we would access this function as we would access any other static method:
import com.packt.chapter4.Chapter4; ...
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