Scala require a subclass to use keyword "override" explicitly in order to override a parent class method.
Edwards Air Force Base | Wright-Patterson Air Force Base | Guantanamo Bay Naval Base | Gym Class Heroes | Offutt Air Force Base | Maxwell Air Force Base | Ace of Base | class action | Nellis Air Force Base | class | Vandenberg Air Force Base | Ramstein Air Base | Eglin Air Force Base | Marine Corps Base Quantico | Tan Son Nhut Air Base | Class A | working class | Marine Corps Base Camp Lejeune | BASE jumping | Marine Corps Base Hawaii | DB Class 218 | Class War | Clark Air Base | British Rail Class 37 | base on balls | Social class | Peterson Air Force Base | MacDill Air Force Base | Lackland Air Force Base | Kadena Air Base |