struction

type Circle struct {
	// contains filtered or unexported fields
}

type GoodStudent struct {
	Student
	// contains filtered or unexported fields
}

type Human struct {
	Name   string
	Age    int
	Weight int
}

type Man interface {
	SayHi()
	Sing(s string)
}

type Rectangle struct {
	// contains filtered or unexported fields
}

type Student struct {
	Human // 匿名字段，那么默认Student就包含了Human的所有字段
	// contains filtered or unexported fields
}