IndexOf()

Question

Why is the output -1
https://sololearn.com/compiler-playground/cS7qCZUEdNaC/?ref=app

Answer 1

Shivam Gupta ,

> the string method `indexOf()` returns the zero-based index of the first occurrence of a specified character or substring in a given string.

> we can also pass an `index value` as a second argument to define where the search should start from.

> the method returns `-1` if the passed value can not be found.

in your case the search is looking for an upper case "F". but this does not exist in the string. so `-1` will be returned.

if we search for "r", the result will be 5.

Answer 2

https://letmegooglethat.com/?q=java+indexOf+documentation