java8 检查给定月日在当年是否为13号星期五

import java.time.Month;
import java.time.Year;
import java.time.LocalDate;
import java.time.DayOfWeek;
import java.time.DateTimeException;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalAccessor;
import java.io.PrintStream;
public class Superstitious {
    public static void main(String[] args) {
        Month month = null;
        LocalDate date = null;
        if (args.length < 2) {
            System.out.printf("Usage: Superstitious <month> <day>%n");
            throw new IllegalArgumentException();
        }
        try {
            month = Month.valueOf(args[0].toUpperCase());
        } catch (IllegalArgumentException exc) {
            System.out.printf("%s is not a valid month.%n", args[0]);
            throw exc;     // Rethrow the exception.
        }
        int day = Integer.parseInt(args[1]);
        try {
            date = Year.now().atMonth(month).atDay(day);
        } catch (DateTimeException exc) {
            System.out.printf("%s %s is not a valid date.%n", month, day);
            throw exc;     // Rethrow the exception.
        }
        System.out.println(date.query(new FridayThirteenQuery()));
    } 
}

import java.time.Month;
import java.time.Year;
import java.time.LocalDate;
import java.time.DateTimeException;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.ChronoField;
import java.io.PrintStream;
import java.lang.Boolean;
public class FridayThirteenQuery implements TemporalQuery<Boolean> {
    // Returns TRUE if the date occurs on Friday the 13th.
    public Boolean queryFrom(TemporalAccessor date) {
        return ((date.get(ChronoField.DAY_OF_MONTH) == 13) &&
                (date.get(ChronoField.DAY_OF_WEEK) == 5));
    }
}