How do I format date in Joda-Time using ISODateTimeFormat class?

This example demonstrate how to use the ISODateTimeFormat class to format the date time information in Joda-Time.

package org.kodejava.joda;

import org.joda.time.DateTime;
import org.joda.time.format.ISODateTimeFormat;

public class ISODateTimeFormatDemo {
    public static void main(String[] args) {
        DateTime dateTime = DateTime.now();

        // Returns a basic formatter for a full date as four digit
        // year, two-digit month of year, and two digit day of
        // month yyyyMMdd.
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicDate()));
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicDateTime()));
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicDateTimeNoMillis()));

        // Returns a formatter for a full ordinal date, using a four
        // digit year and three digit dayOfYear yyyyDDD.
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicOrdinalDate()));

        // Returns a basic formatter for a full date as four digit
        // weekyear, two-digit week of weekyear, and one digit day
        // of week xxxx'W'wwe
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicWeekDate()));
        System.out.println(dateTime.toString(
                ISODateTimeFormat.basicWeekDateTime()));
    }
}

The result of the code above is printed below:

20211029
20211029T091631.884+0800
20211029T091631+0800
2021302
2021W435
2021W435T091631.884+0800

Maven Dependencies

<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.12.7</version>
</dependency>