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.

Replace at least one custom usage of a growable array in the code you have written so far with an ArrayList.

Challenge 2.

Capitalize every String in the ArrayList<String>.

class Main {
    void main() {
        ArrayList<String> things = new ArrayList<>();
        things.add("movies");
        things.add("television");
        things.add("video games");
        
        // CODE HERE

        // Should output
        // [MOVIES, TELEVISION, VIDEO GAMES]
        IO.println(things); 
    }
}

Challenge 3.

Every time John Wick assassinates someone he gets one crime coin (to spend at a crime hotel).

Watch the first John Wick movie. For each named character you can remember John Wick assassinating add one crime coin to the johnWick ArrayList.

record CrimeCoin(String target) {}

class Main {
    void main() {
        ArrayList<CrimeCoin> johnWick = new ArrayList<>();
        
        // CODE HERE

        IO.println(johnWick);
    }
}

If you need to cheat you can find the list here.

Challenge 4.

Using the ArrayList of CrimeCoins, construct an ArrayList<String> with all the characters' names.

record CrimeCoin(String target) {}

class Main {
    void main() {
        ArrayList<CrimeCoin> johnWick = new ArrayList<>();
        
        // CODE FROM LAST CHALLENGE

        ArrayList<String> names = new ArrayList<>();

        // CODE HERE

        IO.println(names);
    }
}