static box Main {
    init { console }

    main() {
        me.console = new ConsoleBox()
        
        box User {
            private { age, passwordHash }
            public  { name }

            init { name, age }

            birth(n, a) {
                me.name = n
                me.age = a
            }

            setAge(a) {
                me.age = a   # private だが内部からなのでOK
            }

            getAge() {
                return me.age   # private を内部参照（OK）
            }
        }

        local u = new User("Alice", 20)
        me.console.log("name(public)=" + u.name)   # OK: public
        u.name = "Bob"                             # OK: public set

        me.console.log("age(private, internal)=" + u.getAge())  # OK: 内部アクセス
        u.setAge(21)                                            # OK: 内部でprivate set
        me.console.log("done")
    }
}