Calling Kotlin function with parameter as sealed class from java

Question

My Kotlin class TimeUtils has a sealed class declared as:

sealed class TimeUnit {
    object Second : TimeUnit()
    object Minute : TimeUnit()

fun setTimeOut(timeout : TimeUnit) {
    // TODO something
}

My Java class is calling setTimeOut method like:

TimeUtils obj = new TimeUtils();
if (some condition) {
    obj.setTimeOut(TimeUtils.TimeUnit.Minute);   // ERROR
} else if (some other condition) {
    obj.setTimeOut(TimeUtils.TimeUnit.Second);   // ERROR
}

I am getting error at above 2 lines stating expression required. Can anyone help how can I solve it?

score 6 · Accepted Answer · answered Jul 17 '19 at 15:22

You should invoke the function as following:

obj.setTimeOut(TimeUtils.TimeUnit.Minute.INSTANCE);

It's because object Minute will be compiled to the following Java code:

public final class Minute {
   public static final Minute INSTANCE;

   private Minute() {
   }

   static {
      Minute var0 = new Minute();
      INSTANCE = var0;
   }
}

Calling Kotlin function with parameter as sealed class from java

1 Answers1