面向对象的swift例子

import Foundation

println("Hello, World!")
class Animal{
    func jump()->String{
        return "Animal Jump"
    }
}
class Cat:Animal{
    override func jump() -> String {
        return "Cat Jump"
    }
}
class Mouse:Animal{
    override func jump() -> String {
        
        return super.jump()+" And Mouse Jump"
    }
}
class Dog{
     func jump() -> String {
        return "Dog Jump"
    }
}
func outResult(result:Animal){
    var retstr=result.jump()
    println("The Result is \(retstr)")
}
outResult(Animal())
outResult(Cat())
outResult(Mouse())
//outResult(Dog()) 错误

结果
Hello, World!
The Result is Animal Jump
The Result is Cat Jump
The Result is Animal Jump And Mouse Jump
Program ended with exit code: 0