//定义一个person类
class Person
{var name : String = ""var age : Int = 0func say(content:String){print(content)}
}//定义一个dog结构体
struct Dog
{var name : Stringvar age : Intfunc run(){print("\(name) is running")}
}//创建实例
var p6:Person
p6 = Person()
var p5 = Person()
var p7 = p6
p6.name = "sun"
p6.say("swift is so easy")
print(p6.name)
print(p5.name)
p6.name = "zhu"
print(p7.name)var dogfff = Dog(name: "doggy", age: 4)
print(dogfff.age)
dogfff.run()
var dogggg = dogfff
dogggg.name = "happy"
print(dogfff.name)

class User
{var name:Stringvar age:Intinit(name:String , age:Int){self.name = nameself.age = age}
}
var u1 = User(name: "abe", age: 12)
var u2 = User(name: "abe", age: 12)
print(u1 === u2)
var u3 = u1
print(u3 === u1)struct Level {var grade:Int
}var v1 = Level(grade: 1)
var v2 = Level(grade: 2)
//print(v1 === v2)   这里不能这样写，因为只有引用类型能这样比较

func == (left:User, right:User) -> Bool
{return left.name == right.name && left.age == right.age
}func != (left:User, right:User) -> Bool
{return !(left == right)
}
var resultttt = u1==u2
print(resultttt)

struct FixedLengthRange {var start: Intlet length: Int
}
var rg = FixedLengthRange(start: 2, length: 10)
rg.start = 5

class Dept
{var id : Intvar info : Stringinit(id : Int){self.id = idNSThread.sleepForTimeInterval(2)self.info = "2 second late"}
}
class User4 {var id:Int = 0lazy var dept = Dept(id: 20)//dept 属性会在被调用的时候才被初始化，提升了程序的性能var nicks = [String]()
}
var usersss = User4()
usersss.nicks.append("sun")
usersss.nicks.append("qiqiqi")
print(usersss.nicks)

enum Seasonnn
{case Spring, Summer, Fall, Wintervar info:String{get{print("the get method is running")switch(self){case .Spring:return "flower"default:return "no"}}set (newValue){print("the set method is running and the pragmatic is \(newValue)")}}
}
var s = Seasonnn.Spring
print(s.info)
s.info = "baby"//简化的set方法
enum Seasonnn2
{case Spring, Summer, Fall, Wintervar info:String{get{print("the get method is running")switch(self){case .Spring:return "flower"default:return "no"}}set{print("the set method is running and the pragmatic is \(newValue)")}}
}/*
声明只读的计算属性
没有set方法，只有get方法
这里可以省略get这个关键字和花括号
*/
enum Seasonnn3
{case Spring, Summer, Fall, Wintervar info:String{get{print("the get method is running")switch(self){case .Spring:return "flower"default:return "no"}}}
}
var ss = Seasonnn3.Spring

class People {var name:String = "" {willSet{if(newValue.characters.count > 6) || (newValue.characters.count < 2){print("the name you input is iligo")}else{print("set name success")}}didSet{print("set name over")}}
}
var jane = People()
jane.name = "d"
print(jane.name)//虽然这两个方法有监察作用，但是并不能阻止赋值的执行