class MyAwesomeActivity {
    companion object {
        val KEY = "MyAwesomeKey"
    }
}

==

public final class MyAwesomeActivity {
   @NotNull
   private static final String KEY = "MyAwesomeKey";
   public static final MyAwesomeActivity.Companion Companion = new MyAwesomeActivity.Companion((DefaultConstructorMarker)null);

   public static final class Companion {
      @NotNull
      public final String getKEY() {
         return MyAwesomeActivity.KEY;
      }

      private Companion() {
      }

      // $FF: synthetic method
      public Companion(DefaultConstructorMarker $constructor_marker) {
         this();
      }
   }
}

// MyAwesomeActivity.kt file
const val STATIC_FIELD = "MyAwesomeKey1"

class MyAwesomeActivity{
    companion object{
        const val INNER_STATIC_FIELD = "MyAwesomeKey2"
    }
}

==

public final class MyAwesomeActivityKt {
   @NotNull
   public static final String STATIC_FIELD = "MyAwesomeKey";
}

public final class MyAwesomeActivity {
   @NotNull
   public static final String INNER_STATIC_FIELD = "MyAwesomeKey2";
   public static final MyAwesomeActivity.Companion Companion = new MyAwesomeActivity.Companion((DefaultConstructorMarker)null);

   public static final class Companion {
      private Companion() {
      }

      // $FF: synthetic method
      public Companion(DefaultConstructorMarker $constructor_marker) {
         this();
      }
   }
}

In conclusion, if you just need a static field I would suggest to declare the field asconst valoutside the class to avoid having a companion object and the relatedinner static class,alternatively just remember to useconstinside the companion object to at least avoid the getter method.