Question

I have

String x = g.substring(0, 1);
if (x == "S") {
    stuff
}

I have a string, “Safety”, but “stuff” doesn’t run and my watch say x value = S and x=="S" = false.

Answer 1

== is used for identity comparison, and it checks whether the two reference points to the same object (in your case the object is String).

You should use the equals method to compare the contents of your string:

if (x.equals("S"))