The limit on the amount of characters you can have in Apex is 3,000,000. I understand that comments and test classes do not count towards this limit. Another developer just asked me if the space character counts and I could not answer with certainty. I hope that someone out there can tell me that they do not count against the character limit.
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A quick test would suggest that they do...
Here is a simple class in my DE
and the code usage
If I add loads of characters, the usage goes up..
when I removed them, it went back down, now I added loads of white space, and the usage climbed again:
And this is chaining lots of spaces together, so I would say that lots of individual spaces in real code will behave the same way..!
It even counts spaces at the end of a line, as you can see here:
It does also count the spaces at the start of a line (the indentation)
It does not appear to count spaces in lines containing nothing but spaces though!