Can you think of a fast way to look up the name when you are given the phone number?

Question

Add a method getName(String phoneNumber) to the PhoneBook class.

Answer 1

```
/? ?
? Method t o g e t t h e name f o r a phone number
? @param number t h e phone number t o l o o k u p
? @return t h e name i f found e l s e n u l l
?/
public S t r i n g getName ( S t r i n g number )
{
return nameMap . g e t ( number ) ;
}
```

Use another Map to store the phone number as the key and the name as the value. See the PhoneBook class in the bookClassesFinal directory.