namespace const_and_readonly
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Half a year have {0} Moths", Calendar.Moths/2); //直接類名.字段訪問(wèn)const字段
Calendar test1 = new Calendar();
Console.WriteLine("Every year has {0} weeks and {1} days", test1._weeks, test1._days);//readonly字段通過(guò)實(shí)例訪問(wèn)
Calendar test2 = new Calendar(31, 4);
Console.WriteLine("January has {0} weeks and {1} days", test2._weeks ,test2 ._days);
Console.ReadKey();
}
}
class Calendar
{
public const int Moths = 12; //const必須在聲明中初始化
public readonly int _days=365; //readonly在聲明中初始化
public readonly int _weeks;
public Calendar() //readonly在構(gòu)造函數(shù)內(nèi)初始化
{
_weeks = 52;
}
public Calendar(int days,int weeks) //readonly在構(gòu)造函數(shù)內(nèi)初始化
{
_days = days;
_weeks = weeks;
}
public void setvalue(int days,int weeks)
{
// _days = days; 無(wú)法對(duì)只讀字段賦值
//_weeks = weeks; 無(wú)法對(duì)只讀字段賦值
}
}