Complete Program

Here is the complete program. There are lots of details here, and it is easy to get lost. The cure for this is to run the program and to play with it for a while. The Programming Exercises of this chapter have some suggestions.

class PhoneEntry
{
  String name;    // name of a person
  String phone;   // their phone number
  PhoneEntry( String n, String p )
  {
    name = n; phone = p;
  }
}

class PhoneBook
{ 
 PhoneEntry[] phoneBook; 
 PhoneBook()    // constructor
 {
   phoneBook = new PhoneEntry[ 5 ] ;
   phoneBook[0] = new PhoneEntry(
    "James Barclay", "(418)665-1223");
   phoneBook[1] = new PhoneEntry(
    "Grace Dunbar", "(860)399-3044");
   phoneBook[2] = new PhoneEntry(
    "Paul Kratides", "(815)439-9271");
   phoneBook[3] = new PhoneEntry(
    "Violet Smith", "(312)223-1937");
   phoneBook[4] = new PhoneEntry(
    "John Wood", "(913)883-2874");
 }

 PhoneEntry search( String targetName )  
 {
   for (int j=0; j<phoneBook.length; j++)
   {
     if ( phoneBook[ j ].
       name.equals( targetName))
           return phoneBook[ j ];
   }
   return null;
 }
}

class PhoneBookTester
{
 public static void main (String[] args)
 {
   PhoneBook pb = new PhoneBook();  
  
   // search for "Violet Smith"
   PhoneEntry entry =
    pb.search( "Violet Smith" ); 

   if ( entry != null )
     System.out.println( entry.name + 
       ": " + entry.phone );
   else
     System.out.println("Name not found");

 }
}