Challenges

Remember the rules for this are

• Try to use only the information given up to this point in this book.
• Try not to give up until you've given it a solid attempt

Challenge 1.

Print out every day from January 1st to December 31st. When the program reaches your birthday make it print out "Happy Birthday <your name>" instead of the date.

class Main {
    void main() {
        // CODE HERE
    }
}

Challenge 2.

Make a Poison class which has a Duration field which stores how long the poison will be potent for as well as an Instant at which the poison was brewed.

Implement a method that takes an Instant and returns if the Poison will be expired by that point.

import java.time.Duration;
import java.time.Instant;

class Poison {
    // CODE HERE
}

class Main {
    void main() {
        var hemlock = new Poison(Instant.now(), Duration.ofDays(365 * 3));

        IO.println(hemlock.isPotentAt(Instant.now())); // true
        IO.println(hemlock.isPotentAt(Instant.now().plus(Duration.ofDays(5))); // true
        IO.println(hemlock.isPotentAt(Instant.now().plus(Duration.ofDays(365 * 10)))); // false
    }
}

Challenge 3.

Get as input using IO.readln a day, month, year, and UTC offset.

Interpret that input as an OffsetDateTime then print how many seconds will have passed between that offset date time and midnight of January 1st 1983 GMT.

class Main {
    void main() {
        // CODE HERE
    }
}

Challenge 4.

A train leaves Boston at 12:50pm EDT on August 23rd 2025 and arrives in Chicago at 10:12am CDT August 24th 2025.

How many minutes long was that train ride? Use the Java's time classes to figure out the answer.

class Main {
    void main() {
        // CODE HERE
    }
}

As a small hint, you will first want to represent those events as ZonedDateTimes, convert the ZonedDateTimes to Instants, and then get the Duration between those Instants. Then get the number of minutes in that Duration.