1. /**
    2.  * Display the numnber of days in each month of the specified year.
    3.  */
    4. import java.time.Month;
    5. import java.time.Year;
    6. import java.time.YearMonth;
    7. import java.time.DateTimeException;
    9. import java.io.PrintStream;
    10. import java.lang.NumberFormatException;
    12. public class MonthsInYear {
    13.     public static void main(String[] args) {
    14.         int year = 0;
    16.         if (args.length <= 0) {
    17.             System.out.printf("Usage: MonthsInYear <year>%n");
    18.             throw new IllegalArgumentException();
    19.         }
    21.         try {
    22.             year = Integer.parseInt(args[0]);
    23.         } catch (NumberFormatException nexc) {
    24.             System.out.printf("%s is not a properly formatted number.%n",
    25.                 args[0]);
    26.             throw nexc;     // Rethrow the exception.
    27.         }
    29.         try {
    30.             Year test = Year.of(year);
    31.         } catch (DateTimeException exc) {
    32.             System.out.printf("%d is not a valid year.%n", year);
    33.             throw exc;     // Rethrow the exception.
    34.         }
    36.         System.out.printf("For the year %d:%n", year);
    37.         for (Month month : Month.values()) {
    38.             YearMonth ym = YearMonth.of(year, month);
    39.             System.out.printf("%s: %d days%n", month, ym.lengthOfMonth());
    40.         }
    41.     }
    42. }