Enum optimization

gistfile1.txt

// create an alternative method for getting a list of defined enums to avoid system creating a clone of the String array
// this is the .values() method

public enum Car {
  TESLA, VOLVO, TOYOTA;
  }
  
// normally what would happen
public static Car[] values() {
  return (Car[])$VALUES.clone();
 }
 
 
// HOW TO MITIGATE THIS BEHAVIOR
public enum Car {
  TESLA, VOLVO, TOYOTA;
  
   private static final List<Car> VALUE_LIST= Stream.of(values()).collect( collectingAndThen(toList(), Collections::unmodifiableList));
   // VALUE_LIST is unmodifiable; otherwise we cannot expose it directly via the valuesAsList() method
   public static List<Car> valuesAsList() {
      return VALUE_LIST;
     }
   }
   
   // example usage
   Car.valuesAsList().forEach( System.out::println);