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.

Declare an interface named DoubleArray which requires two methods of classes that implementing classes: length and get.

These methods should be specified to work the same as how [] and .length work on a double[].

interface DoubleArray {
    // CODE HERE
}

Challenge 2.

Make a class that implements your DoubleArray interface using a double[] in a field to perform all the operations.

interface DoubleArray {
    // CODE FROM PREVIOUS CHALLENGE
}

class RealDoubleArray /* CODE HERE */ {
    // CODE HERE
}

class Main {
    void main() {
        DoubleArray arr = new RealDoubleArray(new double[] {
            1.0, 1.5, 2.0, 2.5, 3.0
        });

        for (int i = 0; i < arr.length(); i++) {
            IO.println("Got double value: " + arr.get(i));
        }
    }
}

Challenge 3.

Make a second class that implements DoubleArray but have this one be backed by an int[] and perform widening conversions when returning values.

interface DoubleArray {
    // CODE FROM PREVIOUS CHALLENGE
}

class FauxDoubleArray  /* CODE HERE */ {
    // CODE HERE
}

class Main {
    void main() {
        DoubleArray arr = new FauxDoubleArray(new int[] {
            1, 2, 3, 4, 5
        });

        for (int i = 0; i < arr.length(); i++) {
            IO.println("Got double value: " + arr.get(i));
        }
    }
}

Challenge 4.

Make an implementation of the following Tarot interface for each tarot card featured in JoJo's Bizzare Adventure.

interface Tarot {
    String symbolism();

    String standUser();
}