这个没必要用到IFelse 吧 ，你直接运用日期中的一些方法就可以做到 BufferedReader buf;buf = new BufferedReader(new InputStreamReader(System.in));String str = buf.readLine();SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");Calendar cal = Calendar.getInstance();cal.setTime(format.parse(str));cal.set(Calendar.YEAR,format...
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.println("please input a year:");
String year = sc.nextLine().trim...
