Why is first: used in this code ? What does it mean? Is it a keyword or so ? Explain its usage

Question

https://code.sololearn.com/cA0cLJNQRECA/?ref=app

Answer 1

Since "goto" is a java keyword but yet it is not implemented in Java, so there must be something to replace it.

This is kind of an example for that. The first: is a label and when you say continue first; the control is moved back to the label and execution starts from the top.

Edit: You can remove the label to see the difference in result you get.

Answer 2

Avinesh ~ swim ~ can it be replaced by other word like identifiers means it can be first second a b anything x y z like that?