Why do you not declare several variables of the same type on the same line?

Question

Why is it bad practice to declare variables on one line?

e.g.

private String var1, var2, var3

instead of:

private          


        

Answer 1

Generally it is, for the version control and commenting reasons discussed by others, and I'd apply that in 95% of all cases. however there are circumstances where it does make sense, for example if I'm coding graphics and I want a couple of variables to represent texture coordinates (always referenced by convention as s and t) then the declaring them as

int s, t; // texture coordinates

IMHO enhances code readability both by shortening the code and by making it explicit that these two variables belong together (of course some would argue for using a single point class variable in this case).