Enums in Java are typically used to represent a set of related constants in a type-safe way. For example, you might have something like

enum DayOfWeek{
  SUNDAY,
  MONDAY,
  TUESDAY,
  WEDNESDAY,
  THURSDAY,
  FRIDAY,
  SATURDAY
}

But, as we saw in class, Java enums are more than just fancy variables. They are full classes and can have behavior. Create an named Operation with four values: ADD, SUBTRACT, MULTIPLY, DIVIDE. Each one should have a property called symbol set to +, -, ⨉, and ÷ respectively and should implement the method int apply(int a, int b) appropriately for the given operation. The enum should also include a method public Operation fromSymbol(char symbol) that returns the appropriate enum value.