Java Find the next pay day - Java Date Time

Java examples for Date Time:Date Time Query

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Description

Java Find the next pay day

Demo Code

import java.time.Month;
import java.time.Year;
import java.time.LocalDate;
import java.time.DateTimeException;
import java.time.format.DateTimeFormatter;

import java.io.PrintStream;
import java.time.LocalDate;
import java.time.DayOfWeek;
import java.time.DateTimeException;

import java.time.temporal.Temporal;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAdjusters;

import java.io.PrintStream;

/**/*  w  ww .  jav a 2s.c o m*/
 * This temporal adjuster assumes that payday occurs on the 15th
 * and the last day of each month. However, if either of those
 * days lands on a weekend, then the previous Friday is used.
 */
class PaydayAdjuster implements TemporalAdjuster {

    /**
     * The adjustInto method accepts a Temporal instance
     * and returns an adjusted LocalDate. If the passed in
     * parameter is not a LocalDate, then a DateTimeException is thrown.
     */
    public Temporal adjustInto(Temporal input) {
        LocalDate date = LocalDate.from(input);
        int day;
        if (date.getDayOfMonth() < 15) {
            day = 15;
        } else {
            day = date.with(TemporalAdjusters.lastDayOfMonth())
                    .getDayOfMonth();
        }
        date = date.withDayOfMonth(day);
        if (date.getDayOfWeek() == DayOfWeek.SATURDAY
                || date.getDayOfWeek() == DayOfWeek.SUNDAY) {
            date = date.with(TemporalAdjusters.previous(DayOfWeek.FRIDAY));
        }

        return input.with(date);
    }
}
/**
 * This example takes a month and day from the command line and,
 * assuming the current year, prints the next payday.
 * This example uses the PaydayAdjuster class.
 */
public class NextPayday {

    public static void main(String[] args) {
        Month month = null;
        LocalDate date = null;
        DateTimeFormatter format;
        String out = null;

        if (args.length < 2) {
            System.out.printf("Usage: NextPayday <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.
        }

        LocalDate nextPayday = date.with(new PaydayAdjuster());

        try {
            format = DateTimeFormatter.ofPattern("yyyy MMM d");
            out = date.format(format);
            System.out.printf("Given the date:  %s%n", out);
            out = nextPayday.format(format);
            System.out.printf("the next payday: %s%n", out);
        } catch (DateTimeException exc) {
            System.out.printf("%s can't be formatted!%n", out);
            throw exc;
        }

    }
}

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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