How to estimate zip file size in java before creating it

Question

I am having a requirement wherein i have to create a zip file from a list of available files. The files are of different types like txt,pdf,xml etc.I am using java util clas

Answer 1

Maybe you could add a file each time, until you reach the 5MB limit, and then discard the last file. Like @Gopi, I don't think there is any way to estimate it without actually compressing the file.

Of course, file size will not increase (or maybe a little, because of the zip header?), so at least you have a "worst case" estimation.