Labeled Statement block in Java?

Question

I was browsing through some of the base Java objects when I found a section of code surrounded by a scan: {} block. The following code is from the toLowerCase()

Answer 1

It is a label. It is a indicator for flow control.

If you look at your code, you see below

 break scan;

When this happens, the flow exits completely the scan block.

By the way, it can be any identifier, scan is not a keyword at all.