Is

Unit

the equivalent of Java's

Void

rather than lowercase

void

?

It serves as both

Kind of, Java

Void

doesn't have an instance but it allows

null

so that's kind of the single instance.

Technically,

Void

id equivalent to Kotlin's

Nothing?

I think it’s the equivalent for kotlin’s

Void?

Kotlin doesn't have

Void

, that's from java.

Nothing

can't return, but

Nothing?

can return only

null

, just like Java's

Void

.

Sorry, meant

Unit?

Unit?

can return

Unit

or

null

Unit

is mapped to

Void

in Java

No,

Unit

is mapped to

void

(lowercase) for return type in Java, but stays as

Unit

in other circumstances, such as generics.

Yep, and what

Unit?

is mapped to?

It will stay

Unit?

into Java code

Yes

there’s not

Unit?

in Java…..

Sorry, It would just be

Unit

, but with Java;s implied nullability.

Got it 🙂

You can try it:

// Test.kt
fun test(): Unit? {
    return null
}

// Test.java
TestKt.test();  // returns kotlin.Unit

Thanks 🙂