use boolean value for loop

Question

So technically a boolean is True (1) or False(0)...how can I use a boolean in a loop?

so if FYEProcessing is False, run this loop one time, if FYEProcessing is true, run it twice:

for (Integer i=0; i<FYEProcessing; ++i){
   CreatePaymentRecords(TermDates, FYEProcessing);      
}

As a side note, if you are looking for a boolean value inside of a loop, you can use while but it does not seem to work with what you need. — Anthony Forloney
– Anthony Forloney, Commented Apr 6, 2010 at 19:07
Nit: I think your "i<FYEProcessing" should be "i<=FYEProcessing" to represent the behavior you described. — Bert F
– Bert F, Commented Apr 6, 2010 at 19:35
You should also use int instead of Integer, although you never access the 'i' variable. Using Integer just adds overhead for no reason. — Chris Dennett
– Chris Dennett, Commented Apr 6, 2010 at 19:37

matt b · Accepted Answer · 2010-04-06 19:04:33Z

7

So technically a boolean is True (1) or False(0)

This is not true in Java. You cannot use an integer in place of a boolean expression in a conditional, i.e. if (1) {...} is not legal.

You are better of just doing this sequentially rather than attempting to use some sort of looping strategy to avoid having two lines which call CreatePaymentRecords()

CreatePaymentRecords(TermDates, FYEProcessing);  
if (FYEProcessing) {
    //run again
    CreatePaymentRecords(TermDates, FYEProcessing);  
}

answered Apr 6, 2010 at 19:04

matt b

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1 Comment

Leslie Over a year ago

thanks, that will work...with a little modification, I need the createPaymentRecords to enter a 0 the first time and a 1 the second time, so I'd have to hard code the values...

james · Accepted Answer · 2010-04-06 19:09:41Z

7

for (int i=0; i < (FYEProcessing ? 2 : 1); ++i){
   CreatePaymentRecords(TermDates, FYEProcessing);      
}

answered Apr 6, 2010 at 19:09

james

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Comments

thegrinner · Accepted Answer · 2010-04-06 19:10:44Z

1

For a loop that would use a boolean true/false for the condition, just use do {...} while (condition) or while (condition) {...}. The first will always run at least once, then check the condition. The second would run only if the condition was initially true.

answered Apr 6, 2010 at 19:10

thegrinner

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Comments

Bert F · Accepted Answer · 2010-04-06 19:50:54Z

I think we should strive to make code clearly understandable and I have hard time thinking where "boolean loop" is clear. Trying to use a "boolean loop" may seem slicker in code, but I think it detracts from the understandability and maintainability of the code.

I distilled what you described:

so if FYEProcessing is False, run this loop one time, if FYEProcessing is true, run it twice

into

so if FYEProcessing is False, run this loop one time [with false], if FYEProcessing is true, run it twice [with false, then true]

or

run this loop one time with false. If FYEProcessing is true, run it again with true

CreatePaymentRecords(TermDates, false);
if (FYEProcessing) {
    CreatePaymentRecords(TermDates, true);
}

Greg Bogumil · Accepted Answer · 2010-04-06 23:57:16Z

-1

if you simply want to execute this as long as the boolean is a particular value then use a do or while loop.

do { CreatePaymentRecords(TermDate, FYEProcessing); } while (FYEProcessing);

edited Apr 6, 2010 at 23:57

answered Apr 6, 2010 at 19:09

Greg Bogumil

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2 Comments

Mike Clark Over a year ago

Unless CreatePaymentRecords updates the value of FYEProcessing (which we have not been told), then this loop will never exit.

Greg Bogumil Over a year ago

given the question "how can I use a boolean in a loop?" my answer is informative. Perhaps the author does know about do or while loops. Using the if statement posted is not code most people would like to debug.

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