Java Reference
In-Depth Information
public PhoneNumber getNumber(Person key) {
BookEntry entry = getEntry(key);
if(entry != null) {
return entry.getNumber();
} else {
return null;
}
}
private HashMap<Person,BookEntry> phonebook = new HashMap<>();
private static final long serialVersionUID = 1001L;
}
Directory "TryPhoneBook 1"
To store
BookEntry
objects you use a
HashMap<Person,BookEntry>
member,
phonebook
. You use the
Person
object corresponding to an entry as the key, so the
addEntry()
method has to retrieve only the
Person
object from the
BookEntry
object that is passed to it and use that as the first argument to the
put()
method for
phonebook
.
All you need now is a class containing
main()
to test these classes:
public class TryPhoneBook {
public static void main(String[] args) {
PhoneBook book = new PhoneBook();
// The phone
book
FormattedInput in = new FormattedInput();
// Keyboard
input
Person someone;
while(true) {
System.out.println("Enter 1 to enter a new phone book entry\n" +
"Enter 2 to find the number for a name\n" +
"Enter 9 to quit.");
int what = 0;
// Stores input
selection
try {
what = in.readInt();
} catch(InvalidUserInputException e) {
System.out.println(e.getMessage() + "\nTry again.");
continue;
}
switch(what) {
case 1:
book.addEntry(BookEntry.readEntry());
break;
case 2:
