private void updateMainClassFragment(boolean isImplicitClass) {
    if (myMainClassFragment == null) return;
    myMainClassFragment.component().setImplicitClassConfiguration(isImplicitClass);

    if (isImplicitClass) {
      myMainClassFragment.setHint(ExecutionBundle.message("application.configuration.main.class.unnamed.hint"));
    } else {
      myMainClassFragment.setHint(ExecutionBundle.message("application.configuration.main.class.hint"));
    }
  }
private void updateMainClassFragment(boolean isImplicitClass)