Empty spaces

Good morning,

This is for the newbies:

When you're developing code and you need to test if a String object is truly empty, be careful. Here's an example:

class IsStringTrulyEmpty {

    public static void main(String[] args) {

            //Is string truly empty?
            String s = " ";
            String t = "";
       
            //Test
            System.out.println("Is s truly empty? " + s.isEmpty());
            System.out.println("Is t truly empty? " + t.isEmpty());
    }
}

Here is the output when run:

Is s truly empty? false
Is t truly empty? t rue

Notice that s returned false. Why? There is a space between the quotation marks. This may have an impact, because if you're checking if a string is empty, it will never be true if there's a space.

It truly is all in the details.

Happy coding!