判斷2018年中某天是星期幾用JAVA語言怎麽寫？

public?class?B?{

public?static?void?main(String[]?args)?{

Calendar?c=new?GregorianCalendar();

Scanner?sc=new?Scanner(System.in);

while(true)?{

System.out.println("輸入哪年：");

c.set(Calendar.YEAR,?sc.nextInt());

System.out.println("輸入壹年中第幾天：");

c.set(Calendar.DAY_OF_YEAR,?sc.nextInt());

int?n=c.get(Calendar.DAY_OF_WEEK);

String[]?str=?{"星期日","星期壹","星期二","星期三","星期四","星期五","星期六"};

String?s=str[n-1];

System.out.println("這壹天是："+s+"\n*************************");

}

}

}