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Provided Code

public class Level
{
    public boolean goalReached() { /* not shown */ }
    public int getPoints() { /* not shown */ }
}

public class Game
{
    private Level levelOne;
    private Level levelTwo;
    private Level levelThree;
    public Game() { /* not shown */ }
    public boolean isBonus() { /* not shown */ }
    public void play() { /* not shown */ }
    public int getScore() { /* to be implemented in part (a) */ }
    public int playManyTimes(int num) { /* to be implemented in part (b) */ }
}

Part A — 4 Points

Write getScore, which returns the score for the most recently played game. Level 1 points are earned only if level 1 goal is reached. Level 2 points only if both levels 1 and 2 goals reached. Level 3 points only if all three goals reached. If bonus game, triple the score.

Write Your Solution

Check Answer Clear

public int getScore()
{
    int score = 0;
    if (levelOne.goalReached())
    {
        score += levelOne.getPoints();
        if (levelTwo.goalReached())
        {
            score += levelTwo.getPoints();
            if (levelThree.goalReached())
            {
                score += levelThree.getPoints();
            }
        }
    }
    if (isBonus())
    {
        score *= 3;
    }
    return score;
}

Part B — 5 Points

Write playManyTimes, which simulates num games (using play()) and returns the highest score earned. Must call both play and getScore appropriately.

Write Your Solution

Check Answer Clear

public int playManyTimes(int num)
{
    play();
    int maxScore = getScore();
    for (int i = 1; i < num; i++)
    {
        play();
        int score = getScore();
        if (score > maxScore)
        {
            maxScore = score;
        }
    }
    return maxScore;
}

Common Mistakes to Avoid

if (levelOne.goalReached()) {
    score += levelOne.getPoints();
}
if (levelTwo.goalReached()) {
    score += levelTwo.getPoints();  // wrong!
}

if (levelOne.goalReached()) {
    score += levelOne.getPoints();
    if (levelTwo.goalReached()) {
        score += levelTwo.getPoints();
        if (levelThree.goalReached()) {
            score += levelThree.getPoints();
        }
    }
}

for (int i = 0; i < num; i++) {
    int score = getScore();  // missing play()!
    ...
}

for (int i = 0; i < num; i++) {
    play();         // always call play first
    int score = getScore();
    ...
}

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