Challenge_21.java

package challenge21_30;

import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
import java.util.List;

/**
 * Period A date-based amount of time  new Period(year, month, day);
 *
 */
public class Challenge_21 {
    public static void main( String[] args ) {
        List<SpiderMan> spiderManList = Arrays.asList(
                new SpiderMan("The Spider Man", LocalDate.of(1962, Month.SEPTEMBER, 8)),
                new SpiderMan("The Black Suit", LocalDate.of(1984, Month.SEPTEMBER, 8)),
                new SpiderMan("Spider-Man 2099", LocalDate.of(1992, Month.SEPTEMBER, 17))
                );

        LocalDate now = LocalDate.of(2017, Month.SEPTEMBER, 18);

        spiderManList.forEach(spiderMan -> {
                    Period period = Period.between(spiderMan.creationDate, now);
                    System.out.println(spiderMan.costume+" "+
                    period.get(ChronoUnit.YEARS)+" years "+
                    period.get(ChronoUnit.DAYS)+" days"
                    );
            }
        );
    }

    static class SpiderMan {
        String costume;
        LocalDate creationDate;
        SpiderMan(String costume, LocalDate dateOfBirth){
            this.costume = costume; this.creationDate = dateOfBirth.plusDays(2).plusYears(2);
        }
    }
}