Java Query Date occurs on Friday the 13th - Java Date Time

Java examples for Date Time:Date Time Query

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Description

Java Query Date occurs on Friday the 13th

Demo Code

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;
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;

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));
    }/*from   w ww.  ja  v a 2 s.c o  m*/
}
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()));
    }
}

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