Part (a)

Write the getDownloadInfo method that finds a download by title.

Solution

public DownloadInfo getDownloadInfo(String title)
{
    for (DownloadInfo d : downloadList)
    {
        if (d.getTitle().equals(title))
        {
            return d;
        }
    }
    return null;
}

Part (b)

Write the updateDownloads method that updates or adds download info.

Solution

public void updateDownloads(List titles)
{
    for (String title : titles)
    {
        DownloadInfo info = getDownloadInfo(title);
        if (info == null)
        {
            downloadList.add(new DownloadInfo(title));
        }
        else
        {
            info.incrementTimesDownloaded();
        }
    }
}

Key Concepts

Common Mistakes