\`==\`与\`hashValue`

Fruit_01.Swift

class Apple:Fruit {
    override var hashValue: Int {
        return super.hashValue - "apple".characters.count
    }
}

class Banana:Fruit {
    override var hashValue: Int {
        return super.hashValue - "banana".characters.count
    }
}

let a = Apple(name: "")
let b = Banana(name: "")
print(a == b) // true
print(a.hashValue) // prints 4799450059485596700
print(b.hashValue) // prints 4799450059485596699