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|---|---|
| Language | Swift |
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| Owner | w3xue |
| Created | |
| Modified | |
| Visibility | Public |
class Circle {
var radius = 12.5
var area: String {
return "矩形半径为 \(radius) "
}
}
class Rectangle: Circle {
var print = 7
override var area: String {
return super.area + " ，但现在被重写为 \(print)"
}
}
let rect = Rectangle()
rect.radius = 25.0
rect.print = 3
print("半径: \(rect.area)")
class Square: Rectangle {
override var radius: Double {
didSet {
print = Int(radius/5.0)+1
}
}
}
let sq = Square()
sq.radius = 100.0
print("半径: \(sq.area)")
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