Go language Exercise: Reflection

Examples of several reflections: 1) Simple Type reflection, 2) complex type reflection, 3) modifiable properties for reflected data

1. Simple Type Reflection

1.1) Code

Package Mainimport ("FMT"    "reflect") Func main () {varx float64 =3.4V:=reflect. ValueOf (x) fmt. Println ("Type:", V.type ()) fmt. Println ("Kind is float64:", v.kind () = =reflect. Float64) fmt. Println ("Value:", V.float ())}

1.2) running Results

 is true  3.4

2. Complex Type Reflection

2.1) Code

1 Package Main2 3 Import (4     "FMT"5     "reflect"6 )7 8Type Tstruct {9AintTenBstring One } A  - Func Main () { -T: = t{203,"mh203"} theS: = reflect. ValueOf (&t). Elem () -Typeoft: =S.type () -      forI: =0; I < S.numfield (); i++ { -F: =S.field (i) +Fmt. Printf ("%d:%s%s =%v\n", I, - Typeoft.field (i). Name, F.type (), F.interface ()) +     } A}

2.2) Running results

0 int 203 1 string = mh203

3. Configurable properties of variables obtained through reflection

3.1) Code example

1 Package Main2 3 Import (4     "FMT"5     "reflect"6 )7 8 func TestA () {9     varx float64 =3.4TenV: =reflect. ValueOf (x) One     if(true==V.canset ()) { AFmt. Println ("V is setable") -         //V.set (4.1) -}Else { theFmt. Println ("v is not setable") -     } - } -  + func Testb () { -     varx float64 =3.4 +P: = reflect. ValueOf (&x) AFmt. Println ("type of P:", P.type ()) atFmt. Println ("Settablitty of P:", P.canset ()) -  -V: =P.elem () -Fmt. Println ("Settablitty of V:", V.canset ()) -  -V.setfloat (7.1) in FMT. Println (V.interface ()) - FMT. PRINTLN (x) to } +  - Func Main () { the TestA () * Testb () $}

3.2) Running results

Setis*falsetrue7.17.1 

Go language Exercise: Reflection