//多态
class A
{
var name:String
init(name:String) {
self.name = name
}
func printName()
{
print("this is A \(name)")
}
}
class B : A
{
override func printName() {
print("this is B:\(name)")
}
func play()
{
print("this is B play")
}
}
var s1:A = A(name: "a")
print(s1.name)
s1.printName()
var s2:B = B(name: "b")
s2.printName()
s2.play()
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