package structTest //struct //Date：2014-4-1 09:57:37 import ( "fmt" "strings" ) func StructTest01Base() { //structTest0101() //structTest0102() structTest0103() } //定义一个struct type Student struct { id int name string address string age int } func structTest0101() { //使用new创建一个Student对象,结果为指针类型 var s *Student = new(Student) s.id = 101 s.name = "Mikle" s.address = "红旗南路" s.age = 18 fmt.Printf("id:%d\n", s.id) fmt.Printf("name:%s\n", s.name) fmt.Printf("address:%s\n", s.address) fmt.Printf("age:%d\n", s.age) fmt.Println(s) } //创建Student的其它方式 func structTest0102() { //使用&T{...}创建struct，结果为指针类型 var s1 *Student = &Student{102, "John", "Nanjing Road", 19} fmt.Println(s1) fmt.Println("modifyStudentByPointer...") modifyStudentByPointer(s1) fmt.Println(s1) //使用T{...}创建struct，结果为value类型 fmt.Println("-------------") var s2 Student = Student{103, "Smith", "Heping Road", 20} fmt.Println(s2) fmt.Println("modifyStudent...") modifyStudent(s2) fmt.Println(s2) //创建并初始化一个struct时，一般使用【上述】两种方式 //其它方式 var s3 *Student = &Student{id: 104, name: "Lancy"} fmt.Printf("s3:%d,%s,%s,%d\n", s3.id, s3.name, s3.address, s3.age) } //struct对象属于值类型，因此需要通过函数修改其原始值的时候必须使用指针 func modifyStudent(s Student) { s.name = s.name + "-modify" } func modifyStudentByPointer(s *Student) { s.name = s.name + "-modify" } type Person struct { firstName string lastName string } //使用 *Person作为参数的函数 func upPerson(p *Person) { p.firstName = strings.ToUpper(p.firstName) p.lastName = strings.ToUpper(p.lastName) } //调用上述方法的三种方式 func structTest0103() { //1- struct as a value type: var p1 Person p1.firstName = "Will" p1.lastName = "Smith" upPerson(&p1) fmt.Println(p1) //2—struct as a pointer: var p2 = new(Person) p2.firstName = "Will" p2.lastName = "Smith" (*p2).lastName = "Smith" //this is also valid upPerson(p2) fmt.Println(p2) //3—struct as a literal: var p3 = &Person{"Will", "Smith"} upPerson(p3) fmt.Println(p3) } 有疑问加站长微信联系（非本文作者）
