Well-behaved objects - Objects First with Java: A Practical Introduction Using BlueJ - page 241

Code 7.1
continued
The SalesItem class

public void upvoteComment( int index)
{

if (index >=0 && index < comments.size()) { // index is valid
comments.get(index).upvote();

}

}

/**
* Downvote the comment at 'index'. That is: count this comment as
* less helpful. If the index is invalid, do nothing.
*/
public void downvoteComment( int index)
{

if (index >=0 && index < comments.size()) { // index is valid
comments.get(index).downvote();

}

}

/**
* Show all comments on screen. (Currently, for testing purposes:
* print to the terminal. Modify later for web display.)
*/
public void showInfo()
{

System.out.println( "*** " + name + " ***" );
System.out.println( "Price: " + priceString(price));
System.out.println();
System.out.println( "Customer comments:" );
for (Comment comment : comments) {
System.out.println( "-----------------------------------" );
System.out.println(comment.getFullDetails());

}
System.out.println();
System.out.println( "=====================================" );

}

/**
* Return the most helpful comment. The most useful comment is the
* one with the highest vote balance. If there are multiple
* comments with equal highest balance, return any one of them.
*/
public Comment findMostHelpfulComment()
{

Iterator<Comment> it = comments.iterator();
Comment best = it.next();