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Stupid Nested For Loop Problem JAVA

Woof!

Hi everybody,

this was given to me as part of an example in one of my classes. I know what the code is supposed to do, but i dont really know how its done. So basically could someone comment the code and explain how it works.

It is supposed to sort out 5 "exam" objects given in by the user that are stored in "examArray" and then display the five objects by date. It appears to me that theres only one object being shown on screen in the JOptionPane, but ive been wrong in the past. If this is the case could someone please write a small piece of code doing so.

Thanks, see code below.

int lowest_loc = 0;

For (int m = 1; m <examArray.length; m++){
     For (int i = 1; i <examArray.length; i++){
       if(examArray[i] != null){
         if(examArray[i].compareTo(examArray[lowest_loc])){
           Lowest_loc = i;

            }
          }
    }

JOptionPane.showMessageDialog(null, examArray[lowest_loc]);
examArray[lowest_loc] = null;

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Seth Brundle

Will someone please do my homework?

Hobbes

I was going to put in joke comments, but after the reading the code. Roffle.

Woof!

actually its from a sample paper.... dont blame me for not being a fantastic programmer

http://inismor.ucd.ie/~fintanc/cs1001/COMP10020_sample_answers_2006.pdf

Seth Brundle

Where are your (photocopied?) lecture notes

Hobbes

Have you tried writing out exactly what each line is trying to do yet?

Woof!

Where are your (photocopied?) lecture notes

Theyre all on that site but there's only the tiniest little piece on nested loops in there and it involves triangles which i dont find helpful at all.

So these are the things i understand/need help with:

ok i know everytime the loop with "m" in it iterates the loop with "i" in it iterates 5 times.
(i understand what it does i just dont know how and why)

if the examArray has a value then compare it to lowest_loc

then lowest_loc is set to be i (this index)

but only lowest_loc is getting returned in the JOptionPane so how is that all of the objects being returned in order?

Thanks for your help and sorry for not making it clear enough the first post that this wasnt homework!

Woof!

also if im comparing the two indices to try and get the first one should it not specify somewhere along the way: if i < lowest_loc?

themole

the reason its not making sense is because you left out a } at the end, after the last line.

so the JOptionpane is in the outer for loop.

so, the code actually makes sense then.

what happens is that at each iteration of the outer loop the lowest value is found printed and removed from the array.

thats how they get printed in sorted order.

Looking at the link i see that this is fintan costellos introduction to java course, which I am actually a demonstrator for

grover06

Can you tell me more about loops?

Mutant_Fruit

themole wrote:

Looking at the link i see that this is fintan costellos introduction to java course, which I am actually a demonstrator for

So we'll leave you to handle this one then? :P

Woof!

that's great..... cheers and also i didnt leave out the }... that was fintan!

also whats your name and what do u look like? i prob know u to see anyway

Seth Brundle

Woof! wrote:

that's great..... cheers and also i didnt leave out the }... that was fintan!

Glancing at the linked exam I can see the closing brace!

Woof!

crap..... erm... typo??

cheers for the help lads, i now have to do the c sample papers!

themole

Woof! wrote:

that's great..... cheers and also i didnt leave out the }... that was fintan!

also whats your name and what do u look like? i prob know u to see anyway

My home page is: www.liammcdermott.com/

and for my sins I have a bebo account

http://theirishmole.bebo.com