ציטוט:

במקור נכתב על ידי דור כבר ענו לך...

הינה התקדמות קטנה:

קוד:

 
//p.361 #1
import hsa.PhoneBook;
import hsa.Stdin;
public class BetterPhoneBook
{
	public static void main (String[] args)
	{
		PhoneBook book;
		int command;
		book = new PhoneBook ();
		System.out.println ("Enter a command");
		System.out.println ("  0 - Quit");
		System.out.println ("  1 - Add an entry");
		System.out.println ("  2 - Look up and entry");
		System.out.println ("  3 - Remove an entry");
		System.out.println ("  4 - Edit an entry");
		System.out.print ("Command: ");
		command = Stdin.readInt ();
		// Loop
		while (command != 0)
		{
			if (command == 1)
			{
				// Add entry.
				String name, phone, personName;
				int a, i;
				System.out.print ("Enter new name: ");
				name = Stdin.readLine ();
				personName = book.lookUp (name);
				a = personName.length ();
				for (i = 1; i <= a; i++)
				{
					if (a == 0)
					{
						System.out.print ("error");
						break;
					}
				}
				System.out.print ("Enter phone number: ");
				phone = Stdin.readLine ();
				
				book.add (name, phone);
				System.out.println ("Added " + name + " to the phone book");
				
			} // if (command == 1)
			else if (command == 2)
			{
				// Look up entry.
				String name, phone;
				System.out.print ("Enter name: ");
				name = Stdin.readLine ();
				phone = book.lookUp (name);
				if (phone.length () == 0)
				{
					System.out.println (name + " was not found " + "in phone book");
				}
				else
				{
					System.out.println (name + "'s phone " + "number is " + phone);
				}
			} // if (command == 2)
			else if (command == 3)
			{
				// Delete entry.
				String name, phone;
				System.out.print ("Enter name to be deleted: ");
				name = Stdin.readLine ();
				phone = book.lookUp (name);
				if (phone.length () == 0)
				{
					System.out.println (name + " was not found " + "in phone book");
				}
				else
				{
					book.remove (name);
					System.out.println (name + " is deleted");
				}
			} // if (command == 3)
			else if (command == 4)
			{
				// Edit entry.
				String name, phone;
				System.out.print ("Enter name to be edited: ");
				name = Stdin.readLine ();
				phone = book.lookUp (name);
				if (phone.length () == 0)
				{
					System.out.println (name + " was not found " + "in phone book");
				}
				else
				{
					System.out.print ("Enter new phone number: ");
					phone = Stdin.readLine ();
					book.remove (name);
					book.add (name, phone);
					System.out.println (name + "'s phone " + "number is now " + phone);
				}
			} // if (command == 4)
			else
			{
				System.out.println ("Illegal command. Command");
				System.out.println ("must be from 0 to 4");
			} // else
			// Prompt user and read the command.
			System.out.print ("Command: ");
			command = Stdin.readInt ();
		} // while (command != 0)
	}
} 

זה לא אומר "שגיאה" שמכניסים את אותו השם פעם שנייה.
למה?