class BarClass

class BarClass {
    
    /**
     * Storage for a protected BazClass object.
     *
     * @var Drupal\Tests\Core\DependencyInjection\Fixture\BazClass
     */
    protected $baz;
    
    /**
     * Setter for our BazClass object.
     *
     * This method is called during the service initialization.
     *
     * @param \Drupal\Tests\Core\DependencyInjection\Fixture\BazClass $baz
     *   A BazClass object to store.
     */
    public function setBaz(BazClass $baz) {
        $this->baz = $baz;
    }
    
    /**
     * Getter for our BazClass object.
     *
     * @return \Drupal\Tests\Core\DependencyInjection\Fixture\BazClass
     *   The stored BazClass object.
     */
    public function getBaz() {
        return $this->baz;
    }

}