Why we have to import java.io* in some projects ?

Answer 1

java.io package pretty much contains all the classes that one would need to perform any input/output operations.
File handling is the most common part of some projects.

Answer 2

Thank you so for help :)

Answer 3

Additionally it's important for you to know, that it's good style to import only what you really need and to avoid using asterisk in imports. At least in professional environment.

Answer 4

Sandra Meyer thank you a lot cause i'm an absolute beginner with java so this kind of suggestions is really helpful for me :)