ComputingImpl(ComputingStrategy<K,V,E> strategy,Builder builder,Function<? super K,? extends V> computer){
  super(strategy,builder);
  this.computingStrategy=strategy;
  this.computer=computer;
}

ComputingImpl ( ComputingStrategy < K , V , E > strategy , Builder builder , Function < ? super K , ? extends V > computer ) { super ( strategy , builder ) ; this . computingStrategy = strategy ; this . computer = computer ; }
creates a new , empty map with the specified strategy , initial capacity , load factor and concurrency level .
