Variable array size

Question

Hi:
I need to match the array size with a variable size input file.How would I accomplish this task?
import java.util.Comparator;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.FileReader;
import java.util.Arrays;
@author LearningJava
A telephone lookup program.
@version 1.0
public class Telephone
{  public static void main(String[] args)
  {  ConsoleReader console = new ConsoleReader(System.in);
     System.out.print ("Enter the file name where the address book"
       + " is stored: ");
     String fileName = console.readLine();
     if (fileName == null)
     System.exit(0);
     PhoneBook people [] = new PhoneBook[ARRAY_SIZE];
     try
     {  FileReader fr = new FileReader(fileName);
        BufferedReader in  = new BufferedReader(fr);
        boolean more = true;
        int count = 0;
        while (more && count < people.length)
           String k = in.readLine();
           String v = null;
           if (k != null) v = in.readLine();
           if (v != null)
              people[count] = new PhoneBook(k, v);
              count++;
           else more = false;
        in.close();
     catch (IOException exception)// Is this complete?
        System.out.println(exception);
        System.exit(1);
     System.out.println("Search choice: 1)name, 2)number");
     String choice = console.readLine ();
     if (choice.equals("1"))
        System.out.println ("Name:");
        String name = console.readLine ();
        Comparator fullName = new FullNameComp();
        Arrays.sort(people, fullName);
        Keyword kw = new Keyword(name);
        Comparator nameLookup = new NameLookup(); 
        int foundIndex = Arrays.binarySearch(people, kw, nameLookup);
        if (foundIndex >= 0)
           System.out.println(people[foundIndex]);
        else
           System.out.println("Name:  " + kw + "' not found in the phonebook");
      if (choice.equals("2"))
         System.out.println ("Number:");
         String phoneNumber = console.readLine ();
         Comparator numSort = new NumberSort();
         Arrays.sort(people, numSort);
         Keyword kw2 = new Keyword(phoneNumber);
         Comparator numLookup = new ReverseLookup();
         int foundIndex2 = Arrays.binarySearch(people, kw2, numLookup);
         if (foundIndex2 >= 0)
            System.out.println(people[foundIndex2]);
         else
            System.out.println("Number:  " + kw2 + " not found in the"
              + "phonebook");
         System.exit(0);
  private static final int  ARRAY_SIZE = 8;
Describes a Telephone book.
@author LearningJava
@version 1.0
class PhoneBook
  Constructor for a phonebook.
  @param name     A person's full name.
  @param number   The phone number.
  public PhoneBook(String name, String number)
     fullName = name;
     phoneNum = number;
  Method(accessor) to get full name.
  @return fullName  The full name.
  public String getName()
     return fullName;
  Method(accessor)to get the telephone number.
  @return phoneNum  The telephone number.
  public String getNumber()
     return phoneNum;
  Method(mutator) to alter the fullName.
  @param fullName  A person's full name.
  public void setFullName(String fullName)
     this.fullName = fullName;
  Method(mutator)to alter the phone number.
  @param phoneNumber   The phone number.
  public void setPhoneNumber(String phoneNumber)
     this.phoneNum = phoneNum;
  Method to return a string.
  @return The phonebook as a string.
  public String toString()
     return fullName + " " + phoneNum;
  private String fullName;
  private String phoneNum;
Describes a Keyword.
@author LearningJava
@version 1.0
class Keyword
  Constructor for a Keyword.
  @param key The keyword.
  public Keyword(String key)
     this.key = key;
  Method to get keyword.
  @return key  The keyword.
  public String getKey()
     return key;
  Method to return a string.
  @return The key as a string.
   public String toString()
      return key;
   private String key;
A class that implemements the Comparator interface for sorting
PhoneBook objects.
@author LearningJava
@version 1.0
class FullNameComp implements Comparator
  A method that compares arguments(compareTo method of the String class)
  for natural order(ascending)based on full name.
  @param obj1 The first object.
  @param obj2  The second object.
  @return     A negative integer, zero, or a positive integer as this
              object is less than, equal to, or greater than the
              specified object.
  public int compare(Object obj1, Object obj2)
     PhoneBook people1 = (PhoneBook) obj1;
     PhoneBook people2 = (PhoneBook) obj2;
     return people1.getName().compareTo(people2.getName());
A class that implemements the Comparator interface for sorting objects.
@author LearningJava
@version 1.0
class NameLookup implements Comparator
  A method that compares arguments for natural order.
  @param obj1 The first object.
  @param obj2  The second object.
  @return     A negative integer, zero, or a positive integer as this
              object is less than, equal to, or greater than the
              specified object.
  public int compare(Object obj1, Object obj2)
     PhoneBook phonebook = (PhoneBook) obj1;
     Keyword keyword = (Keyword) obj2;
     return (phonebook.getName()).compareTo(keyword.getKey());
A class that implemements the Comparator interface for sorting objects.
@author LearningJava
@version 1.0
class NumberSort implements Comparator
  A method that compares arguments for natural order based on phone
  number.
  @param obj1 The first object.
  @param obj2  The second object.
  @return     A negative integer, zero, or a positive integer as this
              object is less than, equal to, or greater than the
              specified object.
  public int compare(Object obj1, Object obj2)
     PhoneBook people1 = (PhoneBook) obj1;
     PhoneBook people2 = (PhoneBook) obj2;
     return people1.getNumber().compareTo(people2.getNumber());
A class that implemements the Comparator interface for sorting objects.
@author LearningJava
@version 1.0
class ReverseLookup implements Comparator
  A method that compares arguments for natural order.
  @param obj1 The first object.
  @param obj2  The second object.
  @return     A negative integer, zero, or a positive integer as this
              object is less than, equal to, or greater than the
              specified object.
  public int compare(Object obj1, Object obj2)
      PhoneBook phonebook = (PhoneBook) obj1;
      Keyword keyword = (Keyword) obj2;
      return (phonebook.getNumber()).compareTo(keyword.getKey());

Answer 1

Looks to me like you want to be using a Vector, not an Array.
i.e, declare 'people' as a vector, and replace this code
while (more && count < people.length)
           String k = in.readLine();
           String v = null;
           if (k != null) v = in.readLine();
           if (v != null)
              people[count] = new PhoneBook(k, v);
              count++;
           else more = false;with this
while (more)
           String k = in.readLine();
           String v = null;
           if (k != null) v = in.readLine();
           if (v != null)
              people.add(new PhoneBook(k, v));
           else more = false;Some of the rest of the code will need changes for casting, and the slightly different way in which vectors are used, but other than that it should work.