Using java scanner in else if

Question

It works if you enter 1, but not for anything else. What should I do?
https://code.sololearn.com/cSxqDGaDmA5K/?ref=app

Answer 1

I’m unfamiliar with using Scanners but I read that NoSuchElementExceptions are thrown if the scanner is exhausted/overused

You’re using an if-else statement where ch.nextInt() is called more than once if it fails the first if condition

Extract this out into its own variable

e.g. int x = ch.nextInt()

and if else on x so the scanner isn’t trying to call nextInt more than once

Answer 2

*I’ll further add why to explicitly explain what happened:

Say you enter ‘2’

if(ch.nextInt()) fails and ‘2’ is read

else if (ch.nextInt() ... ) can’t be processed as ‘2’ has already been read and there is no more input to read from the scanner hence an exception