linux - Vala files import -

i have problem when work properties in separated files in vala language

the main.vala file is

using teste; using cagado;  static int main(string[] args) {       gui gui = new gui();    stdout.printf("%d\n", gui.idade);    return 0; } 

the hellovala.vala is:

namespace teste {     public class person : object     {         private int _age = 32;          public int age         {             { return _age; }             set { _age = value; }         }     } } 

the cagado.vala is:

using teste;  namespace cagado {     public class gui : object     {         person _person = new person();         _person.age = 35;         private int _idade;          public int idade         {             { return _idade; }             set { _idade = value; }         }     } } 

when compile code, compile gives me message error:

cagado.vala:9.15-9.15: error: syntax error, expected identifier     _person.age = 35;                 ^ 

i program in c# , not happened in c# oriented object system. explain this?

the problem this:

public class gui : object {     person _person = new person();     _person.age = 35; // <--     ... 

you can't put arbitrary code inside of class itself, declarations. need like

public class gui : objects {     person _person = new person();     construct {         _person.age = 35;     } 

you modify add constructor person class:

namespace teste {     public class person : object     {         private int _age = 32;          public int age         {             { return _age; }             set { _age = value; }         }          public person(int age) {             glib.object (age: age);         }     } } 

then do

public class gui : object {     person _person = new person(35);