Different Java Kotlin in Android Studio

onClickListener

Java

class ButtonActivity extends Activity {
      protected void onCreate(Bundle saveInstance) {
            Button button = findViewById(R.id.button);
            button.setOnClickListener(new View.OnClickListener() {
                  public void onClick(View view) {
                        System.out.print("Hello World");
                  }
            }
      }
}

Kotlin

class ButtonActivity : Activity() {
      override fun onCreate(saveInstance: Bundle?) {
            button.setOnClicklistener {
                  print("Hello World")
            }
      }
}