DifferenceOfSquaresCalculator.java

final class DifferenceOfSquaresCalculator {

    int computeSquareOfSumTo(final int input) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

    int computeSumOfSquaresTo(final int input) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

    int computeDifferenceOfSquares(final int input) {
      throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

}