// add an entry to theDirectory
// if theDirectory is full do not add the entry

public void add(Entry anEntry)
{
newentry = (f,s,a,h);
}

// deletes an existing entry

public void delete(String nameToDelete)
{
newentry = ();
}

// change the number of an existing entry

public void change(String name, String newTelNo)
{
telNo = newTelNo
}

// finds and returns the number for the search name

public String find(String searchName)
{
find =
}

// returns the entire directory as a String

public String toString()
{
System.out.println(array
}
}

   public class Directory
   {
       private static int maximumEntries = 100;
       Entry[] theDirectory = new Entry[maximumEntries];

       private int FindEntry(string entryName)
       {
           // This method will find an entry in the directory
           // with a name matching 'entryName' and return
           // it's index.
           // It does this by looping over every element in
           // the array 'theDirectory' and checking
           // if that name equals what we are looking for.
           for (int i = 0; i < theDirectory.Length; i++)
           {
               if (theDirectory.Name == entryName)
               {
                   // We found the name we are looking for
                   // return it.
                   return i;
               }
           }

           // If we reached this point in the code, we didn't
           // find an entry that matched the name. Return -1
           // to indicate this.
           return -1;
       }

       public void Add(Entry newEntry)
       {
           // Lets test to see if theDirectory contains less than
           // our maximum number of allowed entries. If it does
           // we are allowed to add an entry.
           // In java, the doing theDirectory.Length will
           // probably not work, you will need to find a method
           // of getting the number of elements in an array.

           if (theDirectory.Length < maximumEntries)
           {
               // We can add an entry.
               theDirectory[theDirectory.Length] = newEntry;
           }
       }

       public void Delete(string NameToDelete)
       {
           // Lets use the method 'FindEntry' to delete an
           // existing entry.
           int index = FindEntry(NameToDelete);
           if (index != -1)
               theDirectory[index] = null;
       }

       public void Change(string name, string newPhoneNumber)
       {
           // Lets use the method 'FIndEntry' to change the
           // number of an existing entry.
           int index = FindEntry(name);
           if (index != -1)
           {
               theDirectory[index].PhoneNumber = newPhoneNumber;
           }
       }

       public string ToString()
       {
           // Lets create a new string object to hold all the content
           // of the directory.
           string directoryContent = "";

           // For each element in the directory, lets add the name
           // and phone number to the string, and also a new line.
           foreach (Entry e in theDirectory)
           {
               directoryContent += e.Name + ": " + e.PhoneNumber + "\n";
           }

           // Lets return the string containing the directory content.
           return directoryContent;
       }
   }