Sorry, I was saying contact when I should have said entry.
Your phone book object contains an array of entries; it can be used to search the entries, add new entries,
etc. At this point you will probably find that an array isn't as good a data structure as we thought at first, and classes from the
Collections Framework would be much easier to use. But you can change the implementation as long as the field in line 1 has
private access without anybody knowing anything about it. You can still pass an
Entry[] as an argument to the constructor even if the implementation doesn't use an array.