intent in android kotlin
val intent = Intent(this,HelloActivity::class.java) startActivity(intent) Why do we need to add .java in the end? Isn't HelloActivity a .kt file? ts because you are calling Java Code from the Kotlin as Intent is a Java Class in Android which accepts .class reference as mentioned below. Intent(Context packageContext, Class cls) Kotlin class reference is not the same as a Java class reference. To obtain a Java class reference, use the .java property on a KClass instance as SampleActivity::class returns KClass which is Kotlin class not a java class. So you cannot pass Kotlin class reference to Java (Intent in your case) and so you have to pass Java class reference
