abohomol

interface CommunicationChannel {
   
    @Throws(IOException::class)
    fun connect(credentials: Credentials)
    
    fun disconnect()
    
    fun getChannelDescription(): Description
}

abohomol

fun List<String>.filterValid(): List<String>

@JvmName("filterValidInt")
fun List<Int>.filterValid(): List<Int>

abohomol

...

@JvmStatic fun newIntent(context: Context): Intent { 
    return Intent(context, SomeActivity::class.java) 
}

/* Now you can omit Companion reference in Java: */

Intent intent = SomeActivity.newIntent(context)

abohomol

class SomeActivity : Activity() { 
    
    ...
    
    companion object { 
        fun newIntent(context: Context): Intent { 
            return Intent(context, SomeActivity::class.java) 
        }
    } 
}

abohomol

@file:JvmName("StringUtils")

abohomol

/* Method declared in StringExtensions.kt: */

public inline fun String.capitalize(): String {
    ...
}

/* Will be translated into the following call in Java: */

String lowercase = ...
String capitalized = StringExtensionsKt.capitalize(lowercase)

abohomol

@ExperimentalContracts
fun notNull(reference: Any?) { 
    contract { 
        returns() implies (reference != null) 
    } 
    if (reference == null) throw NullPointerException()
}

/* Now you can use the methid as follows: */

abohomol

fun getLength(instance: Any): Int { 
    return if (instance is String) { 
        instance.length 
    } else if (instance is Text) { 
        instance.size() 
    } else { 
        0 
    } 
}

abohomol

public static <T> T checkNotNull(T reference) {
  if (reference == null) {
    throw new NullPointerException();
  }
  return reference;
}

abohomol

launch(UI) { 
    val service = ...
    val profile = service.getProfile() // background thread
    view.showUserName(profile.name)    // UI thread 
    finalizeOnboarding()               // background thread
}