How to create a property without accessors in Kotlin?

Question

I am using a Kotlin class from Java code. My Kotlin class looks like:

class Something {
    var a = 0
}

I want to be able to access a from Java code like

s = new Something();
s.a = 5;

however, I only have s.getA() and s.setA(5). Is there any way to make this property directly settable and gettable from Java? Obviously we can't have custom getter and setter in this case.

Answer 1

You can annotate a property with the @JvmField annotation to expose it as a Java field.

If you need to expose a Kotlin property as a field in Java, you need to annotate it with the @JvmField annotation. The field will have the same visibility as the underlying property. You can annotate a property with @JvmField if it has a backing field, is not private, does not have open, override or const modifiers, and is not a delegated property.