//声明一个基类
class vehicle {
var maxPassenger :
Int =
0
var manufacturer :
String!
func description() ->
String {
return
"max passenger is \(maxPassenger) and manufacturer is
\(manufacturer)"
}
init () {
maxPassenger =
2
manufacturer =
"Designed By Weasley"
}
}
//声明子类
class Bicycle :
vehicle {
var numberofWheels :
Int =
2
var maxSpeed :
Double = 30
override
init() {
super.init()
maxPassenger =
2
}
override
func description() ->
String {
//return "numberofWheels : \(numberofWheels) maxPassenger : \(maxPassenger) with maxSpeed : \(maxSpeed) manufacturer is \(manufacturer)"
return
super.description() +
";" + "numberofWheels :
\(numberofWheels) maxSpeed :
\(maxSpeed)"
}
}
class LimitSpeedBicycle:
Bicycle {
override
var maxSpeed : Double {
get {
return
super.maxSpeed
}
set {
super.maxSpeed =
min(maxSpeed,
20)
}
}
}
var bicycle =
Bicycle()
println(bicycle.description())
var limit =
LimitSpeedBicycle()
limit.maxSpeed =
30
println(limit.maxSpeed)
class SpeedLevel:
Bicycle {
var level =
1
override
var maxSpeed : Double{
didSet{
level = Int(maxSpeed /
10) +
1
}
}
override
func description() ->
String {
return
super.description() +
" level is \(level)"
}
}
var aBicycle =
SpeedLevel()
aBicycle.maxSpeed =
40
println(aBicycle.description())