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/**
 * Represents a round of Farkle, where a player throws and keeps dice,
 * until s/he either "bank", i.e. save your points, or
 * farkle, i.e. get no points in a throw and hence looses all gathered points.
 * During and after a finished round, kept sets of dice and their scores are available.
 * During a round, the remaining dice are also available.
 */
public class FarkleRound {
    private int dieCount;
    private Collection<Dice> kept = new ArrayList<>();
    private Dice currentDice;
 
    /**
     * Initializes a new round, where dieCount number of dice is immediately rolled.
     * Note that the round may be immedielately finished, if the initial roll give no points.
     * @param dieCount the number of dice rolled
     * @param scoring the object responsible for computing the score
     */
    public FarkleRound(int dieCount) {
        this.dieCount = dieCount;
        roll(dieCount);
    }
    private void roll(int dieCount) {
        this.currentDice = new Dice(Dice.randomDieValues(dieCount), -1);
        if (computeDiceScores(currentDice).isEmpty()) {
            this.kept.clear();
            this.currentDice = null;
        }
    }
    private Collection<Dice> computeDiceScores(Dice dice) {
       ... implemented earlier in this exam ...
    }
 
    /**
     * @return true of the round is finised, false otherwise
     */
    public boolean isFinished() {
        return this.currentDice == null;
    }

    /**
     * Called when the player decides to stop and secure points.
     * Finishes the round, by keeping all scoring Dice, as computed by the scoring object.
     */
    public void bank() {
        if (isFinished()) {
            throw new ... which exception class ? ...
        }
        this.kept.addAll(computeDiceScores(currentDice));
        ... put this object in a state that indicates this round is finished ...
    }
 
    /**
     * Called when the player decides to keep specific dice and roll the rest.
     * All the dice kept must be scoring ones, but not all scoring dice need to be kept.
     * @param dice the dice to keep, the rest of the current dice should be thrown.
     */
    public void keepAndRoll(final Dice dice) {
        if (isFinished()) {
            throw new ... which exception class ? ...
        }
        if (! currentDice.contains(dice)) {
            throw new ... which exception class ? ...
        }
        final Collection<Dice> scores = computeDiceScores(dice);
        if (scores.stream().mapToInt(Dice::getDieCount).sum() != dice.getDieCount()) {
            throw new SomeKindOfException("You can only set aside dice that contribute to the score");
        }
        kept.addAll(scores);
        currentDice = currentDice.remove(dice);
        // roll remaining dice or all, if there are none left
        ... what code needs to be here ? ...
    }
}

int dieCount2 = currentDice.getDieCount();
if (dieCount2 == 0) {
   dieCount2 = this.dieCount;
}
roll(dieCount2);

// Evt. bareint dieCount2 = currentDice.getDieCount();
roll(dieCount2 == 0 ? this.dieCount : dieCount2);