Spring 5.0 Projects

Calling the Kotlin code from Java

Let's create a Kotlin function that simply does multiplication of two given numbers in the KotlinFile.kt file as follows:

fun multiply(a:Int, b:Int):Int{    print("Calling multiply function From Kotlin....")    return a * b}

We want to call a Kotlin multiply() function into a Java class. As we know, the Kotlin compiler processes this file into a Java class, where it defines the multiply() method as a static method of the KotlinFileKt.class generated class file, so that it can be accessible with the KotlinFileKt.multiply() expression.

In case you wish to change the Java class file name from the Kotlin source, you need to define it as @file:JvmName("CustomKotlinFile") in the Kotlin file. In this case, the Kotlin ...