Let's continue the example from previous post:
class BankAccount {
var balance : Float = 0
}
class CheckingAccount: BankAccount {
func displayAlert(){
if balance < 0 {
print("You have a negative balance of \(balance).")
}
}
}
class SavingAccount: BankAccount {
func displayAlert(){
if balance < 0 {
print("You have a negative balance of \(balance).")
}
}
}
We have just refactored the balance field, but we noticed we also have a method (displayAlert) that is identical. We can apply the same refactoring and move it up the hierarchy.
class BankAccount {
var balance: Float = 0
func displayAlert(){
if balance < 0 {
print("You have a negative balance of \(balance).")
}
}
}
class CheckingAccount: BankAccount {
}
class SavingAccount: BankAccount {
}
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.