An other possibility is:
....
ArrayList<PersonData> persons = new ArrayList<PersonData>();
for(int i = 0; i <= 5; i++) {
Scanner input = new Scanner ( System.in );
System.out.println();
System.out.print( "Please enter the persons name (First Last) or
'stop' to end program: " ); // prompt
String perName = input.nextLine();
if ( perName.equals("stop") ) { //use equals instead of compareTo
here, then you don't have to compare two int values to get a boolean
System.out.println( "Program ended." );
// System.exit(0); //use this to exit the appliaction
return; //use this to return from a method. in this case you are in
the main method and exit the application
}
...
If you do it with a while or with a for-loop does not matter. You can always
achieve the same behaviour with both variants.
Regards
Tom
On Mon, Jan 11, 2010 at 6:59 PM, Dainis Brjuhoveckis <
[email protected]> wrote:
> I would recommend using "while (persons.size() <= 5 )" instead of "while
> (persons.size() < 6" ), because this way it is easier to see that 5 (not 6)
> persons are required.
>
>
> On Mon, Jan 11, 2010 at 7:48 PM, Craig Jensen <[email protected]>wrote:
>
>> Perfect!
>>
>> Thank you! I am still learning the available options to append to an array
>> (or otherwise) within Java (obviously) 'persons.size', duh!
>>
>> It works great.
>>
>> Craig
>>
>> On Mon, Jan 11, 2010 at 10:37 AM, Cecil Haertel III
>> <[email protected]>wrote:
>>
>>> check out the added code and edited code below.
>>>
>>> Now you should move some of the other things out of that loop if this is
>>> way you would like to do it.
>>> There is no need to recreate some of those objects during your iteration.
>>>
>>> I think this is what you are talking about.
>>>
>>> On Mon, Jan 11, 2010 at 12:17 PM, Craig Jensen <[email protected]
>>> > wrote:
>>>
>>>> Ok, let me be more specific. The loop iterations must be five only and
>>>> end without a sentinel even though right now I have included a sentinel.
>>>> Plus, I cannot use a break.
>>>>
>>>> So I was not able to see a syntax that would accomplish this (that's why
>>>> I threw in the sentinel)
>>>>
>>>> Synopsis of the app (I have also included the source of the class with
>>>> the loop):
>>>>
>>>> * prompt for each of 7 different inputs
>>>> * once they are input, display the results including a product of two of
>>>> the inputs
>>>> * return and begin a new prompt all over.
>>>>
>>>> public class AddBook // Modified to include requirement of positive num
>>>> entry for donations (amount of and number of)
>>>> {
>>>> // main method begins execution of java application
>>>>
>>>> public static void main( String args[] )
>>>> {
>>>> ArrayList persons = new ArrayList(); // Array to handle multiple
>>>> entries of persons
>>>> boolean stop = false; // This flag will control whether we exit the
>>>> loop below
>>>> // Loop until user types "stop" as the person's name:
>>>> while (persons.size() < 6 )
>>>>
>>>> {
>>>> // create scanner to obtain input from command window
>>>> Scanner input = new Scanner ( System.in );
>>>> System.out.println(); // a blank line
>>>> System.out.print( "Please enter the persons name (First Last) or
>>>> 'stop' to end program: " ); // prompt
>>>> String perName = input.nextLine(); // read persons name
>>>> /*
>>>> if ( perName.compareTo("stop") == 0) // Check whether user indicated
>>>> to stop program
>>>> {
>>>> System.out.println( "Program ended." );
>>>> stop = true;
>>>> }
>>>> else
>>>> {
>>>>
>>> */
>>>
>>>> // User did not indicate to stop, so continue reading info
>>>> PersonData person;
>>>> float donationNum; // first number, number of donations for the
>>>> year
>>>> float donationAmount; // second number, amount per donation (yeah
>>>> I know it doesn't allow for different amounts).
>>>> String Address;
>>>> String City;
>>>> String State;
>>>>
>>>> System.out.print ( "Please enter the person's Address: " );
>>>> Address = input.nextLine(); // Address validation and exception
>>>> catch needed
>>>>
>>>> System.out.print ( "Please enter the person's City: " );
>>>> City = input.nextLine(); // City validation needed
>>>>
>>>> System.out.print ( "Please enter the person's State: " );
>>>> State = input.nextLine(); // Validation for State needed
>>>>
>>>> String zip = "12345";
>>>>
>>>> //String zipCodePattern = "\\d{5}";
>>>> System.out.print ( "Please enter the person's Zip in five number
>>>> format (88388): " );
>>>> zip = input.nextLine();
>>>> //while (zip != zipCodePattern) // my attempt at a zip validation,
>>>> gave me an infinite loop, will try again later
>>>> // {
>>>> // System.out.print( "The Zip code must be entered in the correct
>>>> format. " +
>>>> // "Please enter the Zip Code again: "); // Ask for
>>>> correct Zip entry
>>>> // System.out.println(zip.
>>>> matches(zipCodePattern));
>>>> // }
>>>>
>>>> System.out.print( "Please enter number of donations: " ); // prompt
>>>> for donation number
>>>> donationNum = input.nextFloat();
>>>> while (donationNum <= 0) // validate for positive number
>>>> {
>>>> System.out.print( "The number of donations must be a positive
>>>> value. " +
>>>> "Please enter the number of donations again: " ); //
>>>> prompt for positive value for donations
>>>> donationNum = input.nextFloat();
>>>> }
>>>> System.out.print( "Please enter donation amount: $" ); // prompt for
>>>> donation amount
>>>> donationAmount = input.nextFloat();
>>>> while (donationAmount <= 0) // validate for positive amount
>>>> {
>>>> System.out.print( "The donation amount must be a positive value.
>>>> " +
>>>> "Please enter the donation amount again: " ); // Prompt
>>>> again after invalid entry
>>>> donationAmount = input.nextFloat();
>>>> }
>>>>
>>>> person = new PersonData(perName, donationNum, donationAmount,
>>>> Address, City, State, zip); // fields included in our person entries
>>>> //yearlyDonations = donationNum * donationAmount; // multiply
>>>> System.out.print( person.getName() ); // display person's name
>>>> System.out.println(); // my way (until I learn better) of
>>>> formatting the output to single lines from here down ->
>>>> System.out.print( person.getAddress() );
>>>> System.out.println();
>>>> System.out.print( person.getCity() );
>>>> System.out.println();
>>>> System.out.print( person.getState() );
>>>> System.out.printf( ", "); // prob a better way to get a comma
>>>> between the state and zip... I'm learning
>>>> System.out.print( person.getZip() );
>>>> System.out.println();
>>>> System.out.print( person.getName() );
>>>> System.out.printf( "'s yearly donations is: $%,.2f\n",
>>>> person.getYearlyDonations() ); // display yearly donations
>>>> persons.add(person);
>>>> }
>>>>
>>> */
>>>
>>>> }
>>>> } // end method main
>>>> } // end class AddBook
>>>>
>>>
>>>
>>
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>>
>
>
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--
Thomas Schiefer
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