kotlin function default arguments from java

April 19, 2023 by Tarik

You can do this now in Kotlin. For your class method, use the @JvmOverloads annotation.

class Foo {
    @JvmOverloads public fun bar(name: String = "World"): String = "Hello $name!"
}

Now simply call it from Java:

Foo foo = new Foo();
System.out.println(foo.bar());
System.out.println(foo.bar("Frank"));

Outputs the following:

Hello World!

Hello Frank!