https://segmentfault.com/a/

Test.go

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package test
func NewTest() ITestIntf {
    return &test{""}
}
type ITestIntf interface {
    GetName() string
    SetName(string) ITestIntf
}
type test struct {
    name string
}
func (t *test) GetName() string {
    return (*t).name
}
func (t *test) SetName(n string) ITestIntf {
    (*t).name =n
    return t
}

SubTest.go

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package test
func NewSubTest() ISubTestIntf {
    return &subTest{NewTest(), "", 0}
}
type ISubTestIntf interface {
    ITestIntf
    GetSex() string
    SetSex(string) ISubTestIntf
    GetAge() int
    SetAge(int) ISubTestIntf
}
func (t *subTest) GetSex() string {
    return (*t).sex
}
func (t *subTest) SetSex(s string) ISubTestIntf {
    (*t).sex =s
    return t
}
func (t *subTest) GetAge() int {
    return (*t).age
}
func (t *subTest) SetAge(a int) ISubTestIntf {
    (*t).age =a
    return t
}

chan.go

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import (
    "fmt"
    "test"
)
func main() {
    var t ITestIntf
    t = NewTest().SetName("张三")
    var s ISubTestIntf
    s = NewSubTest()
    fmt.Println(t.GetName())
    s.SetAge(12).SetSex("女").SetName("李四")//这里不是很完美，父接口的方法必须放到后面。
    fmt.Println("name:",s.GetName(),"sex:", s.GetSex(), "age:", s.GetAge())
}