马诗漫,燃烧热的测定思考题,刷血歌
重写实例方法class Person { var name: String var age: Int func description() -> String { //实例方法 return "\(name) 年龄是: \(age)" } class func printClass() ->() { //静态方法 print( "Person 打印...") } init (name: String, age: Int){ self.name = name self.age = age } } class Student: Person { var school: String convenience init() { self.init(name: "Tony", age: 18,school: "清华大学") } init (name: String, age: Int,school: String) { self.school = school super.init(name: name, age: age) } override func description() -> String { //重写实例方法description,重写的方法前面要添加关键字override print("父类打印 \(super.description())") return "\(name) 年龄是: \(age), 所在学校: \(school)。" } override class func printClass() ->() { //重写静态方法printClass print( "Student 打印...") } } let student1 = student() print("学生1:\(student1.description())")//调用了description方法 Person.printClass() Student.printClass()
class Account { var owner: String = "Tony" //账户名 //不能换成static class func interestBy(amount: Double) -> Double { //静态方法 return 0.08886 * amount } } class TermAccount: Account{//定期账户 //可以换成static override class func interestBy(amount: Double) -> Double { //静态方法 return 0.09 * amount } } //调用静态方法 print(Account.interestBy(10_000.00)) print(TermAccount.interestBy(10_000.00))
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