public class Test {
    public static void main(String[] args) {
        System.out.println("test" + 1);
        System.out.println(1 + " test");
    }
}

fun Any?.plus(str:String)

Also the kotlin to java copy paste in intellij does not work for my example java-code.

items.forEachIndexed { i, item ->
        if (item.flag? == true) {
            // Do some logic then break/return because you found what you needed
            return@forEachIndexed
        }
}

takeWhile

return@forEach

continue

run {}

return@run

run {
            items.forEachIndexed { i, libraryItem ->
                if (libraryItem.uploadedAt?.after(sevenDaysAgo.time) == true) {
                    sections.add(AdapterSection(i, LAST_SEVEN_DAYS))
                    return@run
                }
            }
        }

for (i in 0..items.size() - 1) {
   if (libraryItem.uploadedAt?.after(sevenDaysAgo.time) == true) {
      sections.add(AdapterSection(i, LAST_SEVEN_DAYS))
      break
   }
}

indexOfFirst

val index = items.indexOfFirst { it.uploadedAt... } 
sections.add(AdapterSection(index,... ))

repeat(list.size()) { i -> .... }

for (i in 0..items.size() - 1) { .. }