Computer Science Canada Swap |
Author: | dchini [ Sun Oct 26, 2008 8:18 pm ] | ||
Post subject: | Swap | ||
I am puzzled with this code....
It prints hello goodbye hello goodbye I thought it should have printed hello goodbye goodbye hello |
Author: | OneOffDriveByPoster [ Sun Oct 26, 2008 8:45 pm ] |
Post subject: | Re: Swap |
Java passes references by value. If you change what your function parameters refer to in a function, the change does not get reflected in the caller. |
Author: | A.J [ Sun Oct 26, 2008 10:03 pm ] |
Post subject: | Re: Swap |
I think what u shud do is do the swapping in the main body instead of creating a separate function to do it for u. |
Author: | Saad [ Sun Oct 26, 2008 10:07 pm ] |
Post subject: | Re: Swap |
A.J @ Sun Oct 26, 2008 10:03 pm wrote: I think what u shud do is do the swapping in the main body instead of creating a separate function to do it for u.
But what happens in the case you want to swap a lot of things? Clearly you don't want to be copy/pasting the same code if you can make it a function. |
Author: | rdrake [ Sun Oct 26, 2008 11:26 pm ] |
Post subject: | RE:Swap |
Aren't strings in Java immutable? |
Author: | OneOffDriveByPoster [ Mon Oct 27, 2008 8:35 am ] |
Post subject: | Re: Swap |
Saad @ Sun Oct 26, 2008 10:07 pm wrote: A.J @ Sun Oct 26, 2008 10:03 pm wrote: I think what u shud do is do the swapping in the main body instead of creating a separate function to do it for u. But what happens in the case you want to swap a lot of things? Clearly you don't want to be copy/pasting the same code if you can make it a function.If you are swapping a lot, you are more than likely to be swapping array elements or elements in a container. That is entirely possible to do in a helper function. Hint: pass the array/container in with the indices/keys. |